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# International Power Quality Discussion Forum

Information and tools to solve Power Quality problems.   Join the free Forum.

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- [XML Sitemap](https://ipqdf.com/sitemap.xml): Contains all public & indexable URLs for this website.

## Posts

- [Power Quality and International Standards](https://ipqdf.com/power-quality-and-international-standards/) - 01 · What is PQ? 02 · Disturbances 03 · Key Standards 03b · Regional 04 · Limit Values 05 · Which Standard? 06 · Measurement 07 · Full Catalogue References Power Quality IEC 61000 IEEE 519 EN 50160 CSA C235 Technical Reference Power Quality and International Standards: A Practical Engineering Guide Denis Ruest, M.Sc.
- [The Complete Engineering Guide to Ground Fault Protection on Islanded and Renewable Energy Networks](https://ipqdf.com/zig-zag-reactors-for-zero-sequence-current-supply-for-weak-power-systems/) - Denis Ruest · IPQDF.com · March 2026 From 42 A to 337 A: Zig-Zag Reactors and Ground Fault Detection — A Practical Case Study Single-phase-to-ground faults account for 70–80% of all fault events on medium-voltage power systems worldwide. On a conventional utility network, these faults are readily detected — the short-circuit capacity of the grid
- [Motors and Harmonics: The Modern Assessment and Mitigation Guide Every Plant Engineer Needs](https://ipqdf.com/motors-and-harmonics-the-modern-assessment-and-mitigation-guide-every-plant-engineer-needs/) - IPQDF Technical Reference Series · New Article Motors and Harmonics: The Modern Assessment and Mitigation Guide Every Plant Engineer Needs Denis Ruest · M.Sc. (Applied), P.Eng. (ret.) · April 2026 · Power Quality · Electric Motors · VFD Applications A motor can be running at 14–19% equivalent overcurrent thermally — with every relay, every thermal
- [First Fault Silent, Second Fault Violent](https://ipqdf.com/first-fault-silent-second-fault-violent/) - System Grounding · Ground Fault Protection · Industrial Power Systems First Fault Silent, Second Fault Violent Denis Ruest, M.Sc.A, Eng. (retired) · IPQDF.com · April 2026 The engineering behind solidly grounded, ungrounded, and high-resistance grounded industrial power systems Abstract In industrial power systems with ungrounded or high-resistance grounded neutrals, most unplanned outages trace back to
- [Electric Power Quality — A Technical Overview](https://ipqdf.com/electric-power-quality-a-technical-overview/) - Power Quality · Technical Reference · IEC 61000 · IEEE 519 · EN 50160 · CSA C235 Electric Power Quality — A Technical Overview Denis Ruest, M.Sc. (Applied), P.Eng. (ret.) · IPQDF Technical Reference Series · 11 sections · 21 references · 4 standards bodies Power quality is not about power — it is about
- [Price and Performance Considerations for Harmonic Solutions](https://ipqdf.com/price-and-performance-considerations-for-harmonic-solutions-2/) - I found this excellent paper written in 2000 and decided to share with you. Authors Daniel J. Carnovale, P.E. DanielJCarnovale@eaton.com Eaton | Cutler-Hammer Moon Township, PA Thomas J. Dionise, P.E. ThomasJDionise@eaton.com Eaton | Cutler-Hammer Warrendale, PA Thomas M. Blooming, P.E. ThomasMBlooming@eaton.com Eaton | Cutler-Hammer Minneapolis, MN Introduction This paper assumes that the reader has some
- [Low voltage ride through in grid connected hybrid renewable energy systems | EEP](https://ipqdf.com/low-voltage-ride-through-in-grid-connected-hybrid-renewable-energy-systems-eep/) - IEEE 1547a aims at maintaining sustainable power delivery during the faulty conditions and the generation units ride through the low voltage conditions and Source: Low voltage ride through in grid connected hybrid renewable energy systems | EEP
- [Advanced single-phase motor for single-phase and/or weak distribution grids](https://ipqdf.com/advanced-single-phase-motor-for-single-phase-and-or-weak-distribution-grids/) - Advanced single-phase motors are designed to be uses where larger single-phase motors are needed and/or where the distribution has a weak short-circuit level, because they use technologies that overcome the traditional limitations of conventional single-phase induction motors — especially for high power (tens of HP) and weak rural grids. Please visit Selecting the Right High
- [Low Voltage Inverters for 120/240V 60Hz Systems](https://ipqdf.com/low-voltage-inverters-that-can-be-connected-to-120-240v-60hz/) - Low-voltage (LV) inverters that can be connected to 120/240V 60Hz systems are commonly used in residential, commercial, and industrial applications. These inverters convert DC power (from sources like batteries or solar panels) into AC power compatible with standard North American electrical systems. Below is a list of popular LV inverters that support 120/240V 60Hz output:
- [Solar vs Wind Energy](https://ipqdf.com/solar-vs-wind-energy/) - Deciding between solar panels and a wind turbine for your home or business isn't about choosing the "best" technology overall—it's about choosing the right technology for your specific environment. Solar power is the reliable, low-maintenance champion for most properties, thriving in sunny, unobstructed locations and blending seamlessly into suburban and urban rooftops. It offers predictable
- [Danger Beneath Your Feet: A Deep Dive into Touch and Step Voltage](https://ipqdf.com/danger-beneath-your-feet-a-deep-dive-into-touch-and-step-voltage/) - Introduction When we think of electrical hazards, we often imagine direct contact with a high-voltage power line or a sparking piece of machinery. However, some of the most insidious dangers in electrical engineering occur without any direct contact with a live conductor. During a ground fault in an electrical substation or on a power line,
- [Optimizing Solar Panel Performance: The Complete Guide to Azimuth and Tilt Angles](https://ipqdf.com/optimizing-solar-panel-performance-the-complete-guide-to-azimuth-and-tilt-angles/) - To maximize the energy output of a solar panel system, two critical angles must be optimized: the azimuth (the compass direction the panel faces) and the tilt (the vertical angle from the horizontal). The ideal configuration is primarily determined by geographic latitude, but it is also influenced by energy consumption patterns, roof constraints, and local environmental conditions [1]. 1.
- [Origin of Harmonics at an Electrical Entrance](https://ipqdf.com/harmonic-origin-at-service-entrance/) - 6-Pulse VFD Harmonics: Theoretical vs Practical Spectra Introduction · 1 · Theory · 2 · Practical · 3 · System · 4 · Mitigation · 5 · Measurement · Conclusion · References Power Quality · Variable Frequency Drives Harmonics h3 – h50 Load conditions: 25% · 50% · 75% · 100% Standards: IEEE 519 ·
- [6-Pulse Variable Frequency Drives: A Comparative Analysis of Theoretical and Practical Harmonic Spectrum](https://ipqdf.com/6-pulse-variable-frequency-drives-a-comparative-analysis-of-theoretical-and-practical-harmonic-spectra/) - 6-Pulse VFD Harmonics: Theoretical vs Practical Spectrum Introduction · 1 · Theory · 2 · Practical · 3 · System · 4 · Mitigation · 5 · Measurement · Conclusion · References Power Quality · Variable Frequency Drives Harmonics h3 – h50 Load conditions: 25% · 50% · 75% · 100% Standards: IEEE 519 ·
- [Power Factor Correction and Harmonic Resonance: A Reference Guide for Power Quality Experts and Plant Engineers](https://ipqdf.com/power-factor-correction-and-harmonic-resonance-a-reference-guide-for-power-quality-experts-and-plant-engineers/) - Power Quality Harmonics Power Factor Correction IEC 61642 · IEEE 519 Power factor correction is one of the most routine investments in industrial electrical engineering — install a capacitor bank, reduce reactive power charges, improve the utility bill. For decades this approach worked reliably. In a world dominated by linear inductive loads, capacitors did exactly
- [Electric Power Quality and Lighting (part 1)](https://ipqdf.com/electric-power-quality-and-lighting-part-1/) - Posted May 26 2012 by Sufi Shah Hamid Jalali in Energy Efficiency, Lighting with 2 Comments on Electrical Engineering Portal Original Source: Wolsey, Robert, Power Quality, Volume 2, Number 2, February 1995 (Lighting Research Center (LRC) and Power Quality) Introduction Concerns about the effects of lighting products on power distribution systems have focused attention on
- [Electric Power Quality and Lighting (part 2)](https://ipqdf.com/electric-power-quality-and-lighting-part-2/) - Posted May 29 2012 by Sufi Shah Hamid Jalali in Energy Efficiency, Lighting on Electrical Engineering Portal Original Source: Wolsey, Robert, Power Quality, Volume 2, Number 2, February 1995 (Lighting Research Center (LRC) and Power Quality), What is power factor? Power factor is a measure of how effectively a device converts input current and voltage into
- [Guidelines for producing Power Quality case studies for the web](https://ipqdf.com/guidelines-for-producing-power-quality-case-studies-for-the-web/) - Here are some guidelines to produce an informative Power Quality case studies that will help to sell your skills or mitigating solutions. These sections should be covered: Introduction - The problem statement and the consequences Analysis - what are the steps taken to analyze the problem Solution - what solution has been chosen to mitigate
- [Harmonic Mitigation Techniques Applied to Power Distribution Networks](https://ipqdf.com/harmonic-mitigation-techniques-applied-to-power-distribution-networks/) - Source: Advances in Power Electronics Volume 2013 (2013), Article ID 591680, 10 pages http://dx.doi.org/10.1155/2013/591680 Hussein A. Kazem Faculty of Engineering, Sohar University, P.O. Box 44, 311 Sohar, Oman Academic Editor: Hadi Y. Kanaan Abstract A growing number of harmonic mitigation techniques are now available including active and passive methods, and the selection of the best-suited
- [How to solve Power Quality Problems associated with equipment malfunctions or failures](https://ipqdf.com/how-to-solve-power-quality-problems-associated-with-equipment-malfunctions-or-failures-2/) - Among the most frequent disturbances, voltage dips and short interruptions are at the top of the list and they may interfere with proper operation of a large number of electric, electronic equipment and even entire processes. Thus, residential, commercial and industrial loads may be more sensitive to common network disturbances if precautions are not taken
- [Technical Methods for the Prevention and Correction of Voltage Sags and Short Interruptions inside the Industrial Plants and in the Distribution Networks](https://ipqdf.com/technical-methods-for-the-prevention-and-correction-of-voltage-sags-and-short-interruptions-inside-the-industrial-plants-and-in-the-distribution-networks/) - I have found another interesting article that I would like to share with you. Author: Nicolás Louzán Pérez, Manuel Pérez Donsión1 1Department of Electrical Engineering E.T.S.I.I., Vigo University Lagoas – Marcosende, 36202 Vigo (Spain) e-mail:donsion@uvigo.es Article presented at INTERNATIONAL CONFERENCE ON RENEWABLE ENERGY AND POWER QUALITY (ICREPQ’03) 1. Introduction The classical disruptions present in the

## Pages

- [Power Quality Forum](https://ipqdf.com/forum/) - Please read how to use the Forum page to optimize your contributions.
- [Mirus International – Passive Harmonic Filtering Restores IEEE 519 Compliance at Rambam Health Care Hospital](https://ipqdf.com/case-studies/harmonics/mirus-international-passive-harmonic-filtering-restores-ieee-519-compliance-at-rambam-health-care-hospital/) - 01 · Context 02 · Problem 03 · Why Hospitals Are Stricter 04 · Solution 05 · Results 06 · Perspective References Power Quality Harmonics Healthcare & Institutional IEEE 519-1992 Mirus International – Passive Harmonic Filtering Restores IEEE 519 Compliance at Rambam Health Care Hospital Denis Ruest, M.Sc. (Applied), P.Eng. (ret.) · IPQDF · Technical
- [Case Studies](https://ipqdf.com/case-studies/) - This section holds an impressive amount of Power Quality case studies on flicker, voltage sags, swells, voltage dips, voltage transients, monitoring, electromagnetic disturbance and increasing power supply reliability. These case studies are from experts in the Power Quality field from all over the world.
- [Condensator Dominit – Filtering and Resonance Damping Restore Voltage Quality Aboard a Cruise Ship](https://ipqdf.com/case-studies/harmonics/condensator-dominit-filtering-and-resonance-damping-restore-voltage-quality-aboard-a-cruise-ship/) - 01 · Context 02 · Problem 03 · Why Weak Grids Resonate 04 · Solution 05 · Results 06 · Perspective References Power Quality Harmonics & Resonance Marine / Island Grids Weak Networks Condensator Dominit – Filtering and Resonance Damping Restore Voltage Quality Aboard a Cruise Ship Denis Ruest, M.Sc. (Applied), P.Eng. (ret.) · IPQDF
- [Condensator Dominit – Harmonic Filtering Restores Voltage Quality at a German Brewery](https://ipqdf.com/pq-info/harmonics/211007-2/) - 01 · Context 02 · Problem 03 · Why the 5th 04 · Solution 05 · Results 06 · Perspective References Power Quality Harmonics Food & Beverage IEC 61000-2-4 Condensator Dominit – Harmonic Filtering Restores Voltage Quality at a German Brewery Denis Ruest, M.Sc. (Applied), P.Eng. (ret.) · IPQDF · Technical Reference Series IPQDF gratefully
- [Electromagnetic Coupling (EMC)](https://ipqdf.com/case-studies/electromagnetic-coupling/) - Solutions for Electromagnetic Coupling
- [Glass Factory Failure of Electronic Controls Case Study (Dranetz)](https://ipqdf.com/case-studies/voltage-transients/glass-factory-failure-of-electronic-controls-case-study/) - Electronic controls failed after moving from 60 Hz to 50 Hz country. 50% capacity lost. PQ monitoring revealed transients and harmonics incompatible with 60 Hz-designed equipment.
- [Malfunctioning medical machine (Fluke)](https://ipqdf.com/case-studies/other/malfunctioning-medical-machine/) - Widespread building malfunction with no obvious cause. Systematic measurement revealed tripped GFCI with high neutral current from a malfunctioning medical device.
- [Copper Grounding System Protects Mt. Washington Towers (Copper Devel Association Inc)](https://ipqdf.com/case-studies/other/copper-grounding-system-protects-mt-washington-towers-copper-devel-association-inc/) - Communication towers serving TV, radio and FAA air traffic control suffered lightning damage until comprehensive copper grounding system redesign eliminated all damage.
- [Steel Factory Earthing System](https://ipqdf.com/case-studies/other/steel-factory-earthing-system/) - All laboratory electronics malfunctioning at an Italian steel factory. Earthing system defects created large current loops with damaging potential differences between equipment earths.
- [Power Quality Issues in Medical Facilities — EKG Malfunction](https://ipqdf.com/case-studies/healthcare/power-quality-issues-in-medical-facilities-ekg-malfunction/) - EKG giving unreliable results traced to power cord inductive coupling — internal EMC failure invisible to utility standards. 75% of medical PQ problems are wiring issues.
- [Effect of utility-induced surges in a steel mill with variable speed drives (Practical Grounding, Bonding, Shielding and Surge Protection)](https://ipqdf.com/case-studies/voltage-transients/effect-of-utility-induced-surges-in-a-steel-mill-with-variable-speed-drives-practical-grounding-bonding-shielding-and-surge-protection/) - Steel mill VSDs tripping on overvoltage despite normal RMS voltage. Utility-induced switching surges invisible to voltmeters were the root cause.
- [Conductive Noise (HIOKI)](https://ipqdf.com/case-studies/electromagnetic-coupling/conductive-noise/) - Introduction Conductive noise is electrical noise spreading from various paths. It spreads from the transient overvoltage (lightning strike surge), electrostatic, high-order harmonics, etc. through the power supply, signal and grounding cables. Also, noise generated by magnetic fields is called “radiation noise”. Problem Equipment malfunction or damage Receiving problems with TV and radio signals in the
- [Voltage Waveform Noise & UPS Switching (HIOKI)](https://ipqdf.com/case-studies/voltage-transients/voltage-waveform-noise-ups-switching-hioki/) - Setup Monitoring location : 1-phase 2-wire, 100V circuit Problem Equipment has malfunctioned Analysis 68 “Wave (voltage waveform distortion)” events were recorded during an 18-day measurement period using the following settings. All events are of the same type. Next, the waveform of each “wave” event was checked, and 2 types of events were found. Type 1:
- [Increasing Power Supply Reliability](https://ipqdf.com/case-studies/reliable-power-supply/) - High Reliability Power Supply case studies
- [Healthcare](https://ipqdf.com/case-studies/healthcare/)
- [Supraharmonics](https://ipqdf.com/case-studies/supraharmonics/)
- [EV Charging](https://ipqdf.com/case-studies/ev-charging/)
- [Voltage Unbalance](https://ipqdf.com/case-studies/voltage-unbalance/)
- [Other](https://ipqdf.com/case-studies/other/)
- [Voltage Transients](https://ipqdf.com/case-studies/voltage-transients/)
- [Monitoring](https://ipqdf.com/case-studies/monitoring/)
- [Voltage Sags (Dips)](https://ipqdf.com/case-studies/voltage-sags-dips/) - Power Quality Solutions for voltage sags or dips
- [Flicker](https://ipqdf.com/case-studies/flicker/) - Examples of flicker solutions
- [Harmonics](https://ipqdf.com/case-studies/harmonics/)
- [Electric Power Quality — A Technical Overview](https://ipqdf.com/pq-info/pq-fundamentals/power-quality/) - 01 · Definition · 02 · Phenomena · 03 · Harmonics · 04 · Sags & Swells · 05 · Flicker · 06 · Transients · 07 · Unbalance · 08 · Frequency · 09 · Standards · 10 · Measurement · 11 · Mitigation · IPQDF Series · References Power Quality Reference Overview IEC
- [Power Quality in the German Transmission System — Large-Scale Monitoring, Correlation Analysis, and Long-Term Forecasting](https://ipqdf.com/case-studies/harmonics/power-quality-in-the-german-transmission-system-large-scale-monitoring-correlation-analysis-and-long-term-forecasting/) - 85 IEC 61000-4-30 Class A sites at 110/220/380 kV. Correlation analysis identifies redundant sites. Ensemble forecasting enables proactive compliance. Harmonics, unbalance, and flicker monitored.
- [Interharmonics — The Power Quality Disturbance That Doesn't Show Up on Standard Harmonic Analysers](https://ipqdf.com/case-studies/harmonics/interharmonics-the-power-quality-disturbance-that-doesnt-show-up-on-standard-harmonic-analysers/) - Non-integer frequency components from PV inverters, wind turbines and EV chargers cause flicker via beat frequency. IEC 61000-4-7 analysers cannot correctly detect them. Field case: PV + EV + microwave.
- [Voltage Swell in Industrial Facilities — Three Causes, Five Effects, and the Mitigation Gap](https://ipqdf.com/case-studies/voltage-transients/voltage-swell-in-industrial-facilities-three-causes-five-effects-and-the-mitigation-gap/) - Voltage swells cause MOV failures, VFD trips and PLC reboots. Three causes: SLG fault (max 1.73 pu), load rejection, capacitor switching. DVR reduces 1.724 pu swell to 0.997 pu in field case.
- [Wind Power Generation (HIOKI)](https://ipqdf.com/case-studies/monitoring/wind-power-generation-hioki/) - Problem Inverter controlled equipment stops when detecting a fault in the commercial power supply. Measurement The following items should be measured simultaneously: Voltage fluctuation - The output voltage fluctuates regardless of the demand caused by the wind speed difference. Frequency fluctuation Transient overvoltage, Waveform distortion - Generated by lightning strikes and grid switching Inrush current
- [Wind Generation Power Quality & Interconnect Issues (Dranetz)](https://ipqdf.com/case-studies/monitoring/wind-generation-power-quality-interconnect-issues/) - Wind generation plants are growing at a fast pace. Government assistance in the form of production tax credits, grants for capital investment and other sources of funding are fueling such growth. However, concerns remain over the interconnection of such plants to the grid as well as overall power quality characteristics. Dranetz provides ideal various solutions
- [Voltage Unbalance in High-Voltage Networks — Oman Main Interconnected System](https://ipqdf.com/case-studies/voltage-unbalance/voltage-unbalance-in-high-voltage-networks-oman-main-interconnected-system/) - Three 132 kV grid stations in Oman measured within EN 50160 limits. HV network is balanced — unbalance problems originate downstream, not from the utility.
- [Voltage Unbalance in DER-Rich Networks — When Solar PV Helps and When It Doesn't](https://ipqdf.com/case-studies/voltage-unbalance/voltage-unbalance-in-der-rich-networks-when-solar-pv-helps-and-when-it-doesnt/) - PV integration worsens unbalance in balanced feeders and improves it in unbalanced ones. IEEE PVUR indices can be 10–16× off the true VUF. Use CIGRE index.
- [Voltage Reduction (Microplanet Technology Corp.)](https://ipqdf.com/case-studies/other/voltage-reduction/) - The Need It is estimated over 90% of all worldwide facilities operate at voltages higher than required for optimum operation of electronic equipment. This is a normal occurrence which results from the basic design of local distribution networks, fulfilling the requirement to deliver minimum voltage to users at the far ends of the network. Unfortunately,
- [Voltage Fluctuations and Flicker (John Wiley & Sons, Ltd)](https://ipqdf.com/case-studies/flicker/voltage-fluctuations-and-flicker/) - Author: Araceli Hernández Bayo Source: Handbook of Power Quality Edited by Angelo Baggin, John Wiley & Sons, Ltd 1.0) EVALUATION OF THE CONNECTION OF A THREE-PHASE WELDING MACHINE This example shows a study of flicker prediction based on simplified assessment methods oriented at evaluating the connection of a new fluctuating load to an existing network.
- [Voltage Drop Caused by Cable Impedance (HIOKI)](https://ipqdf.com/case-studies/voltage-sags-dips/voltage-drop-caused-by-cable-impedance/) - Problem Malfunction and damage to equipment (This is a simulation to evaluate the effect of a voltage drop caused by cable impedance.) Analysis Voltage supplied to equipment drops to less than 90V because of cable impedance. Equipment malfunctions or becomes damaged when the power supply voltage drops below the allowable power supply voltage due to
- [Voltage Dip caused by Lightning Strikes – at the Receptacle (HIOKI)](https://ipqdf.com/case-studies/voltage-sags-dips/voltage-dip-caused-by-lightning-strikes-at-the-receptacle/) - Setup HIOKI headquarters building, 3-phase 4-wire, 6.6kV receptacle, Secondary of PT 1 year from June 2003 to May 2004 Problem & Analysis While measuring for 1 year at the receptacle of a 3-phase 6.6kV circuit, a voltage dip is detected only during a lightning strike. This voltage dip occurred 6 times in 3 consecutive days
- [Voltage Dip caused by Lightning Strikes – at the Distribution Panel (HIOKI)](https://ipqdf.com/case-studies/voltage-sags-dips/voltage-dip-caused-by-lightning-strikes-at-the-distribution-panel-hioki/) - Setup Location: HIOKI headquarters building, East side, 5th floor, 1-phase 3-wire, 200V distribution panel Measured period: From June 9, 2002 to August 9, 2002 Problem & Analysis 4 voltage dips caused by lightning were detected during measurement (different period than Case Study 4). The distribution panel (1-phase 3-wire) was affected by the voltage dip that
- [Voltage Dip at a Factory (HIOKI)](https://ipqdf.com/case-studies/voltage-sags-dips/voltage-dip-at-a-factory/) - Southeast Asian factory with damaged power supplies. Monitoring revealed nightly voltage swings of ±50 V (75–125 Vrms) outside peak hours — far outside acceptable limits.
- [Voltage and Current Harmonics (John Wiley & Sons)](https://ipqdf.com/case-studies/harmonics/voltage-and-current-harmonics/) - SELECTION AND RATING OF TRANSFORMERS FOR A SIX-PULSE CONVERTER Calculation of the K Factor DERATING CABLES HARMONIC SOURCE LOCATION
- [Utilization of Forth Channel (HIOKI)](https://ipqdf.com/case-studies/monitoring/utilization-forth-channel/) - Channel 4 is usually used to measure the neutral line of a 3-phase 4-wire system. Because Channel 4 is isolated from the other channels, the following applications are also possible. 1. DC measurement with channel 4 This has wide applications for monitoring the DC power supply system or the internal power supply systemof equipment. Model
- [Transient Overvoltage (HIOKI)](https://ipqdf.com/case-studies/voltage-transients/transient-overvoltage/) - Setup Instrument location : Factory, 3-phase 3-wire, 200V circuit Problem A transient overvoltage was detected in all events occurring several times during the measurement. Unfortunately, the cause of the transient could not be determined. Analysis of transient waveform Occurred on all 3 phases (R-S, S-T, T-R) simultaneously Occurred twice in 1 cycle of the commercial
- [Transient Caused by Glow Fluorescent Lighting (Hioki)](https://ipqdf.com/case-studies/voltage-transients/transient-caused-by-glow-fluorescent-lighting/) - Problem This is an example of how transient overvoltage is measured when turning on glow fluorescent lighting. Analysis A glow fluorescent light incorporates a glow lamp and is widely recognized as a low-cost fluorescent lighting system. A fluorescent light needs to be warmed-up for its electrodes to be switched on. A glow lamp is provided
- [Textile Industry Evaluation (Dranetz)](https://ipqdf.com/case-studies/voltage-sags-dips/textile-industry-evaluation-dranetz/) - Paper mill voltage sag costs $250,000 per event. Duke Energy and Clemson Webstand tool characterises process immunity before sags cause production loss.
- [Synchronization to the GPS Clock (HIOKI)](https://ipqdf.com/case-studies/monitoring/synchronization-to-the-gps-clock-hioki/) - Purpose To measure the spread of lightning strikes or power outages, power quality should be measured at multiple points under the same time clock. Model PW3198 can synchronize its time clock to the UTC (Coordinated Universal Time) clock with ±2ms accuracy by using the optional PW9005 GPS Box. This allows you to measure power quality
- [Switching of a Power Factor Compensation Capacitor (HIOKI)](https://ipqdf.com/case-studies/voltage-transients/switching-of-a-power-factor-compensation-capacitor/) - Power supply damage traced to transient overvoltages from internal power factor correction capacitor switching. A filter at the capacitor bank would have prevented all failures.
- [Supraharmonic Emissions from Photovoltaic Inverters — An Emerging Power Quality Challenge](https://ipqdf.com/case-studies/supraharmonics/supraharmonic-emissions-from-photovoltaic-inverters-an-emerging-power-quality-challenge/) - PV inverters produce supraharmonics (2–150 kHz): narrowband, broadband and time-varying. No regulatory limits exist. Intermodulation creates new frequency components.
- [Supraharmonic Distortion in MV and LV Grids — Four Documented Negative Effects and the Limits Gap](https://ipqdf.com/case-studies/supraharmonics/supraharmonic-distortion-in-mv-and-lv-grids-four-documented-negative-effects-and-the-limits-gap/) - Four effects: heating, dielectric aging, MV cable termination failure, PLC interference. MV/LV transformer amplifies some components. No limits above 9 kHz.
- [Static Converters and Power Quality](https://ipqdf.com/case-studies/voltage-sags-dips/static-converters-and-power-quality/) - Laboratory measurements on a 2.2 kW adjustable speed drive characterise the ride-through boundary as a function of sag depth and duration. Essential for sag specification.
- [STATCOM Case Study](https://ipqdf.com/case-studies/flicker/statcom-case-study/) - Europe's largest steel wire producer installed STATCOM after utility tightened flicker limits. Spot welders exceeded Pst limit. STATCOM reduced flicker to compliant levels.
- [Solar Power Generation (HIOKI)](https://ipqdf.com/case-studies/monitoring/solar-power-generation-hioki/) - Introduction A power conditioner supplies the power (outputs the current) to the grid by using the voltage difference between grid voltage and output voltage. Also, it constantly monitors the grid voltage and frequency so that it can adjust the output voltage and frequency as required. Problem Inverter controlled equipment stops because it detects a fault
- [Rural transformer failure (Fluke)](https://ipqdf.com/case-studies/harmonics/rural-transformer-failure/) - Rural MV transformer failed from overloading combined with VFD harmonic currents. Harmonics cause transformer additional losses even in rural settings with few non-linear loads.
- [Smooth sailing for cruise ship terminal (Reliable Power Inc.)](https://ipqdf.com/case-studies/reliable-power-supply/smooth-sailing-for-cruise-ship-terminal/) - Marco Polo Cruise Ship Terminal | Saint John Port Authority The Scenario In 2009 the Saint John Port Authority was scheduled to host over 190,000 passengers & guests from over 74 cruise ship vessels. The Pugsley A&B terminals were renovate on the city`s waterfront and would be the home of the new Marco Polo Cruise
- [Remote Operation and Measurement (HIOKI)](https://ipqdf.com/case-studies/monitoring/remote-operation-and-measurement-hioki/) - Purpose Remotely operate and monitor the unit installed at a customer’s site. Method Connect to the LAN network and monitor measuremnets using the HTTP server function without using any special software. Connection example using wireless LAN Operate in the same manner as the actual unit by pressing the buttons. The automatic screen refresh rate is
- [Reliable Power keeps research afloat (Reliable Power Inc.)](https://ipqdf.com/case-studies/reliable-power-supply/reliable-power-keeps-research-afloat-reliable-power-inc/) - St. Andrews Biological Station The Scenario Canada’s first marine biological research station began operations as a temporary, floating laboratory, in St. Andrews in 1899. Over the past century, the St. Andrews Biological Station (SABS) has become recognized nationally and internationally for its contributions to marine science. The Challenge St. Andrews Biological Station maintains a reservoir,
- [Reliable Power keeps Goose Bay flying (Reliable Power Inc.)](https://ipqdf.com/case-studies/reliable-power-supply/reliable-power-keeps-goose-bay-flying-reliable-power/) - CFB Goose Bay NATO training facility upgraded aircraft ground support power in Hangars 7 and 8 for military aviation power quality and reliability requirements.
- [Reliable Power keeps airport online (Reliable Power Inc.)](https://ipqdf.com/case-studies/reliable-power-supply/reliable-power-keeps-airport-online-reliable-power/) - Halifax International Airport Authority The Scenario As part of the main incoming power distribution continuous upgrade underway at Halifax Stanfield International Airport, the Halifax International Airport Authority (HIAA) identified a requirement for one (1) 125Vdc station battery and one (1) 125Vdc station battery charger. HIAA requests qualified firms review their project requirements and provide quotations
- [PQ-SVC System Solves Voltage Sag Problems for Manufacturer and Other Users of Utility Substation](https://ipqdf.com/case-studies/voltage-sags-dips/pq-svc-system-solves-voltage-sag-problems-for-manufacturer-and-other-users-of-utility-substation/) - Automated welders caused 4% voltage sags every 30 seconds affecting all customers at the same substation. SVC resolved both the utility complaints and the plant problem.
- [Power Quality in an Academic Institution's Electrical Distribution System — Sultan Qaboos University](https://ipqdf.com/case-studies/harmonics/power-quality-in-an-academic-institutions-electrical-distribution-system-sultan-qaboos-university/) - Full PQ audit: THDI 2–10%, TDD 2–8% across 33/11/0.4 kV. UPS, VFD chillers and PV inverters measured. THD vs TDD explained for IEEE 519 compliance.
- [Power quality improvement and energy saving in textile industry using solid state harmonic filter](https://ipqdf.com/case-studies/harmonics/power-quality-improvement-and-energy-saving-in-textile-industry-using-solid-state-harmonic-filter/) - This case study is available at this link: Power quality improvement and energy saving in textile industry using solid state harmonic filter
- [Power Quality at a Major U.S. Automobile Assembly Plant with Dual Utility Feeds](https://ipqdf.com/case-studies/voltage-sags-dips/power-quality-at-a-major-u-s-automobile-assembly-plant-with-dual-utility-feeds/) - Dual feeds prevented a multi-hour outage from a wind-induced fault — but the 4.8-cycle sag at 68% voltage still caused process disruptions. DVR would have prevented both.
- [Portable Generator connections Wall Street – Infrared (IRINFO)](https://ipqdf.com/case-studies/other/portable-generator-connections-wall-street-infrared-irinfo/) - Author: Frank A. Sinicola Company : IRINFO http://www.irinfo.org/ 888-511-8721 Email: Frank@gfipq.com Local Utility provides portable generation to the downtown mercantile area in Manhattan. After the event of September 11, 2001 the utility connected the portable generators as requested to provide power until normal power could be restored. A review of the terminal connections was requested
- [Phase Imbalance Problem (Microplanet Technology Corp.)](https://ipqdf.com/case-studies/other/phase-imbalance-problem/) - The Need A utility in Hawaii extracts water from deep wells to provide drinking water to customers. They use 3-phase electric motors to pump the water from the wells and out into the distribution system. The quality of the electrical service on the island is poor, however, with significant voltage fluctuations and unbalanced phases.
- [Periodical Instantaneous Voltage Drop (HIOKI)](https://ipqdf.com/case-studies/flicker/periodical-instantaneous-voltage-drop/) - Setup Monitoring location: Retail store, 1-phase 2-wire, 100V outlet Duration: 2 weeks Analysis When analyzing the voltage RMS value fluctuation, the following two phenomena were observed. (The graph shows measurement during 12 hours in the night for a period of 2 weeks.) Maximum value: 106.70Vrms, Average value: 102.53Vrms, Minimum value 93.25Vrms Instantaneous voltage drop occurred
- [Overloaded Service Entrance (Dranetz)](https://ipqdf.com/case-studies/monitoring/overloaded-service-entrance/) - Six air handling units failing at a trading floor. Voltage averaged 450 V instead of 480 V. Root cause: overloaded service entrance, not equipment failure.
- [Newly constructed condominium building in Westchester (Dranetz)](https://ipqdf.com/case-studies/monitoring/newly-constructed-condominium-building-in-westchester/) - Condo elevators would not run on emergency generator. Square wave output incompatible with elevator VFD controllers. Generator waveform was the cause, not voltage drop.
- [Mirus Intl - Turbo Blower Efficiency and Harmonic Compliance at a Municipal Wastewater Plant](https://ipqdf.com/case-studies/harmonics/mirus-intl-turbo-blower-efficiency-and-harmonic-compliance-at-a-municipal-wastewater-plant/) - Municipal wastewater turbo blower VFDs exceeded IEEE 519 TDD limits. Passive harmonic filters achieved compliance and qualified the plant for utility incentives.
- [Mirus Intl - Sinewave Filters for ESP Motor Protection: A Field Case Study in Filter Design and Motor Thermal Response](https://ipqdf.com/case-studies/harmonics/sinewave-filters-for-esp-motor-protection-a-field-case-study-in-filter-design-and-motor-thermal-response/) - 01 · Context 02 · Problem Anatomy 03 · Filter Design 04 · Field Results 05 · PQ Perspective References Power Quality VFD · Sinewave Filter ESP · Oil Field Case Study Sinewave Filters for ESP Motor Protection: A Field Case Study in Filter Design and Motor Thermal Response — Mirus International Denis Ruest, M.Sc.
- [Mirus Intl - Sinewave Filter vs. dV/dT Filter for Long-Cable VFD Applications: A Head-to-Head Field Comparison](https://ipqdf.com/case-studies/harmonics/mirus-intl-sinewave-filter-vs-dv-dt-filter-for-long-cable-vfd-applications-a-head-to-head-field-comparison/) - 01 · Context 02 · dV/dT Filter Limits 03 · Field Test Protocol 04 · Measured Results 05 · The Inversine Difference 06 · PQ Perspective References Power Quality VFD Output · Sinewave Filter dV/dT Filter Comparison Long Cable · Downhole Motor Case Study Sinewave Filter vs. dV/dT Filter for Long-Cable VFD Applications: A Head-to-Head
- [Mirus Intl - Passive vs. Active Harmonic Filter in a Data Center: A Field Comparison](https://ipqdf.com/case-studies/harmonics/mirus-intl-passive-vs-active-harmonic-filter-in-a-data-center-a-field-comparison/) - Active filter failed repeatedly at a NJ data centre. Passive filter achieved THID below 5% on the same VFD loads and has run without failure for years.
- [Mirus Intl - Optimal Transformer Efficiency Using Weighted Average Loading: Beyond DOE 2016](https://ipqdf.com/case-studies/reliable-power-supply/mirus-intl-optimal-transformer-efficiency-using-weighted-average-loading-beyond-doe-2016/) - 01 · The DOE 2016 Problem 02 · Weighted Efficiency 03 · Proposed Equations 04 · Core Technology 05 · PQ Perspective References Power Quality Transformer Efficiency DOE 2016 · Weighted Average ULLTRA · Core Technology Technical Article · Electricity Today 2019 Optimal Transformer Efficiency Using Weighted Average Loading: Beyond DOE 2016 — Mirus International
- [Mirus Intl - Marine Duty Harmonic Mitigation Saves an Offshore Service Vessel Program](https://ipqdf.com/case-studies/harmonics/mirus-intl-marine-duty-harmonic-mitigation-saves-an-offshore-service-vessel-program/) - 01 · Context 02 · Problem 03 · DC Drives & Notching 04 · Solution 05 · Results 06 · PQ Perspective References Power Quality Harmonics · DC Drives Marine · Offshore ABS · Dynamic Positioning Case Study Marine Duty Harmonic Mitigation Saves an Offshore Service Vessel Program — Mirus International Denis Ruest, M.Sc. (Applied),
- [Mirus Intl - Harmonic Mitigation for a Generator-Fed Motor Control Centre: Natural Gas Sweetening Plant](https://ipqdf.com/case-studies/harmonics/mirus-intl-harmonic-mitigation-for-a-generator-fed-motor-control-centre-natural-gas-sweetening-plant/) - 01 · Context 02 · The Generator Problem 03 · Filter Selection 04 · Results 05 · PQ Perspective References Power Quality Harmonics · VSD Generator · MCC Natural Gas Processing Case Study Harmonic Mitigation for a Generator-Fed Motor Control Centre: Natural Gas Sweetening Plant — Mirus International Denis Ruest, M.Sc. (Applied), P.Eng. (ret.) ·
- [Mirus Intl - Harmonic Mitigation and Generator Rightsizing - A Pipeline Pumping Station Case Study](https://ipqdf.com/case-studies/harmonics/mirus-intl-harmonic-mitigation-and-generator-rightsizing-a-pipeline-pumping-station-case-study/) - 01 · Context 02 · Problem Anatomy 03 · Filter Design 04 · Field Results 05 · PQ Perspective References Power Quality VFD · Sinewave Filter ESP · Oil Field Case Study Sinewave Filters for ESP Motor Protection: A Field Case Study in Filter Design and Motor Thermal Response — Mirus International Denis Ruest, M.Sc.
- [Mirus Intl - Harmonic Control at a Remote Oil Well: Better Than 18-Pulse Performance at 12-Pulse Cost](https://ipqdf.com/case-studies/harmonics/mirus-intl-harmonic-control-at-a-remote-oil-well-better-than-18-pulse-performance-at-12-pulse-cost/) - 01 · Context 02 · Single-Drive Problem 03 · Multi-Pulse vs. Lineator 04 · Results 05 · PQ Perspective References Power Quality Harmonics · VSD Remote Well Site Multi-Pulse Comparison Case Study Harmonic Control at a Remote Oil Well: Better Than 18-Pulse Performance at 12-Pulse Cost — Mirus International Denis Ruest, M.Sc. (Applied), P.Eng. (ret.)
- [Mirus Intl - Harmonic Compliance for Nine Panamax Bulk Carriers: CSL Group and the Great Lakes Seaway](https://ipqdf.com/case-studies/harmonics/mirus-intl-harmonic-compliance-for-nine-panamax-bulk-carriers-csl-group-and-the-great-lakes-seaway/) - 01 · Context 02 · The Discovery 03 · VFD Loads on Ships 04 · Solution 05 · PQ Perspective References Power Quality Harmonics · VFD Marine · Panamax Lloyd's · ABS Compliance Case Study Harmonic Compliance for Nine Panamax Bulk Carriers: CSL Group and the Great Lakes Seaway — Mirus International Denis Ruest, M.Sc.
- [Mirus Intl - Generators and Nonlinear Loads: How Harmonic Mitigation Eliminates the Oversizing Requirement](https://ipqdf.com/case-studies/harmonics/mirus-intl-generators-and-nonlinear-loads-how-harmonic-mitigation-eliminates-the-oversizing-requirement/) - 01 · The Problem 02 · Generator Theory 03 · Source Impedance Effects 04 · Wide Spectrum Filter 05 · Case Study 06 · Fuel & Emissions 07 · PQ Perspective References Power Quality Harmonics · Generator Rightsizing · WSHF Fuel · Emissions Technical Article · EGSA Powerline Q3 2019 Generators and Nonlinear Loads: How
- [Malfunctioning traffic light (Fluke)](https://ipqdf.com/case-studies/harmonics/malfunctioning-traffic-light/) - Problem description This case history came from an electric utility engineer assigned to maintain the power systems for several small towns in the western U.S. The engineer carries a Fluke 43B on all trouble calls, because it provides a graphical display that allows customers to see a “picture” of the problem. The case history began
- [Machine shop motor failures (Fluke)](https://ipqdf.com/case-studies/harmonics/machine-shop-motor-failures-fluke/) - Problem description Motor failures can be mysterious. Often, the mechanical loads on the motors have not changed and other loads connected to the same service appear to work normally — yet, the motors just fail. The cause of these mysterious failures is frequently a power quality deficiency. Consequently, the motor rewind industry has become involved
- [Making wind power more reliable (Reliable Power Inc.)](https://ipqdf.com/case-studies/reliable-power-supply/making-wind-power-more-reliable-reliable-power/) - 27 MW Newfoundland wind farm substation UPS ensures protection systems remain available during grid disturbances, preventing loss of entire wind farm on a single fault.
- [Low voltage (Microplanet Technology Corp.)](https://ipqdf.com/case-studies/other/low-voltage/) - The Need One of the largest energy utilities in Australia was experiencing extreme power quality issues in the most remote parts of its system. While their Single Wire Earth Return systems were very cost effective to serve these very rural areas, power quality was poor, lights flickered, and voltage was unstable and very low. Customer
- [Liquid and Gas Pump/Pipeline Applications (American Superconductor)](https://ipqdf.com/case-studies/flicker/liquid-and-gas-pumppipeline-applications/) - Pipeline pump stations with 2,000–15,000 HP motors create flicker, harmonics and reactive power challenges requiring SVC compensation for utility compliance.
- [Lighting ballast evaluation (Fluke)](https://ipqdf.com/case-studies/other/lighting-ballast-evaluation/) - Problem description In most facilities, lighting is a major element of operating cost. Part of that cost is due to energy, and part is due to maintenance. The maintenance costs can be significant. Light fixtures require periodic maintenance — for example, lamps burn out, ballasts fail and lenses need cleaning. The amount of maintenance required varies
- [Lightning Strikes Twice: Proper Grounding Prevents Outages (Copper Development Association Inc)](https://ipqdf.com/case-studies/other/lightning-strikes-twice-proper-grounding-prevents-outages/) - A Total Systems Approach to Electrical Grounding May Save Millions of Dollars Lightning storms occur on average 130 days a year in Florida’s “Lightning Alley,” making this area one of the most dangerous in the United States with respect to weather- related incidents. It is not true that lightning never strikes the same place twice.
- [Inflow and Outflow of Harmonics (HIOKI)](https://ipqdf.com/case-studies/harmonics/inflow-and-outflow-of-harmonics/) - How to determine the origin of harmonics
- [Improving Electric Power System Reliability](https://ipqdf.com/case-studies/reliable-power-supply/improving-electric-power-system-reliability/) - Autor: Radomir GoNO";~~ and Stanislav RusEK* ~Department of Electrical Power Engineering, Faculty of Electrical Engineering and Computer Science, VSB-Technical University of Ostrava, 17, Iistopadu 15, 708 OO Ostrava, Czech Republic E-mail .' radomir.gono@vsb.cz The paper deals with analysis of data about distribution network device failures and electric power supply outages from distribution companies. There are also suggestions
- [Identification of Unhealthy Power Systems with Non-Charateristic Harmonics](https://ipqdf.com/case-studies/harmonics/identification-of-unhealthy-power-systems-with-non-charateristic-harmonics/) - Non-characteristics harmonics including even and 3rd harmonics commonly exist in the electrical power systems but in small amount which are usually below IEEE Std 519-1992 limits. However, in some cases significant amount of non-characteristic harmonics might be present in an industrial facility, which could be an indication of unhealthy power systems. Two case studies are performed in this paper. Case study 1 is about an even harmonic issue in a large mining system, where large 3rd harmonic currents are also present. Case study 2 is a triplen harmonic issue at the input of multiple variable frequency drives experienced in an oil field distribution system. The root cause for even harmonics in Case 1 is the malfunction of two large rectifiers in the mining facility, while the root cause for 3rd harmonics in both cases is the voltage unbalance issue from the utility side. The two case studies verify that non-characteristic harmonics can serve as an indication for unhealthy power systems. When they are detected in unusually large amounts, an analysis and troubleshooting is always recommended in order to have a stable and reliable operation of electrical power systems.
- [High-Order Harmonics (HIOKI)](https://ipqdf.com/case-studies/electromagnetic-coupling/high-order-harmonics/) - Introduction If the power supply of equipment includes a semiconductor control device, high frequency noise (higher than several kHz) may be generated by distorted voltage and current waveforms. The RMS value of such a noise is called “high-order harmonics”. It may contain various frequency components, and becomes a noise higher than multiples of 10V once
- [Harmonics Mitigation on VFD](https://ipqdf.com/case-studies/harmonics/harmonics-mitigation-on-vfd/) - Harmonics Mitigation Increases Output with 30% The water treatment process involves a large number of variable-speed pumps to process large amounts of fluids. By using Active Harmonic Filtering technology to optimize the electrical behaviour of their variable frequency drives, a major water processing plant in Sweden managed to increase the maximum output capacity of their
- [Harmonics Generation, Propagation and Purging Techniques in Non-Linear Loads](https://ipqdf.com/case-studies/harmonics/harmonics-generation-propagation-and-purging-techniques-in-non-linear-loads/) - Harmonics Generation, Propagation and Purging Techniques in Non-Linear Loads Hadeed Ahmed Sher1, Khaled E. Addoweesh 1 and Yasin Khan2 [1] Department of Electrical Engineering, King Saud University, Riyadh, Saudi Arabia [2] Department of Electrical Engineering, King Saud University, Riyadh, Saudi ArabiaSaudi Aramco Chair in Electrical Power, Department of Electrical Engineering, King Saud University, Riyadh, 1.
- [Harmonics and Notches in Dynamic Test Load](https://ipqdf.com/case-studies/harmonics/harmonics-and-notches-in-dynamic-test-load/) - Active Harmonic Filters Improve Dynamic Test-Bed A major pioneer in the manufacturing industry caused problems on the power supply network with their dynamic test bed. Here, an installation of the right combination of active harmonic filters now compensates harmonics up to the 100th order with great results. Both harmonics and voltage notches are reduced to
- [Harmonics Case Study](https://ipqdf.com/case-studies/harmonics/harmonics-case-study/) - Harmonics Case Study: Secure Food Production by Mitigating Harmonics Highly automized processes often contain VFDs, which cause harmonics in the power supply. This can affect machinery and can cause downtime in production lines. This was the case at a major food processing plant in Dortmund, Germany. Background Before: High harmonic current distortion Large disturbance of
- [Harmonic problems in a Casino](https://ipqdf.com/case-studies/harmonics/harmonic-problems-in-a-casino/) - 1,000 slot machines pushed THDv to 5% at the PCC with CCTV interference. Zigzag transformer eliminated triplens, allowing casino expansion within utility limits.
- [Harmonic Filter Design to Mitigate Two Resonant Points in a Distribution Network](https://ipqdf.com/case-studies/harmonics/harmonic-filter-design-to-mitigate-two-resonant-points-in-a-distribution-network/) - This paper investigates the usage of passive harmonic filters to mitigate harmonic distortions when two resonant points are present in a system caused by shunt capacitors used for power factor correction and bus voltage regulation. Six scenarios were investigated using DIgSILENT 14 power factory software. The investigations are with and without power factor correction and capacitors used to increase bus voltage. Passive harmonic filters are designed to reduce harmonic distortions at the PCC (point of common coupling) to fall within the IEEE 519 harmonic voltage and current limits caused by parallel resonance. The results of the case studies are analysed to evaluate the effectiveness of the filter design.
- [Half Wave Rectifier (Fluke)](https://ipqdf.com/case-studies/harmonics/half-wave-rectifier/) - Problem description This case history involves an electrician who works for a large suburban school district. One winter morning, the electrician received a call from a local school. The caller said a transformer supplying power to three portable classrooms was making a “chattering” noise, as if something were loose inside (see Fig. 1). Load measurements
- [General UPS Switching Waveforms (HIOKI)](https://ipqdf.com/case-studies/monitoring/general-ups-switching-waveforms/) - Setup Monitoring location : UPS for a desktop PCs sold in retail stores (1-phase 2-wire, 100V) Problem & Analysis Most low cost UPS used for general purposes output a square wave. However, most people assume that a sine wave is output. Here is a sample waveform output by a UPS. Low cost inverter type Commercial-type
- [Flicker Compensation Case Study](https://ipqdf.com/case-studies/flicker/flicker-compensation-case-study/) - Welding machines at a Belgian radiator factory produced Pst 1.6 vs limit 0.7. Six AHF units (2.1 MVAr) reduced flicker below 0.63 — independently verified.
- [First quality solutions for our First Nations (Reliable Power Inc)](https://ipqdf.com/case-studies/reliable-power-supply/first-quality-solutions-for-our-first-nations-reliable-power-inc/) - Maritime First Nations Communities The Scenario The 2009 flu pandemic was a global outbreak of a new strain of H1N1 influenza virus, often referred to as “swine flu”. With the potential danger of this outbreak there had to be mass amounts of vaccine produced and distributed across the country in a very short period of
- [Even Harmonic Resonance- an Unsual Problem](https://ipqdf.com/case-studies/harmonics/even-harmonic-resonance-an-unsual-problem/) - Chemical plant static converters produced even harmonics (2nd, 4th) from asymmetrical thyristor firing, causing repeated failures in filters designed for odd harmonics only.
- [EV Charging and Power Quality in LV Residential Networks — From Individual Charger to Fleet Penetration](https://ipqdf.com/case-studies/ev-charging/ev-charging-and-power-quality-in-lv-residential-networks-from-individual-charger-to-fleet-penetration/) - Level 2 EV chargers produce dominant 3rd harmonic accumulating in neutral. At 30%+ penetration VUF can exceed 2% at feeder end. Smart charging eliminates the risk.
- [Establishing Correlations Among Power Quality Events to Determine Their Source](https://ipqdf.com/case-studies/voltage-sags-dips/establishing-correlations-among-power-quality-events-to-determine-their-source/) - A crow triggered a MV fault affecting 200+ customers. Four GPS-synchronised monitors confirmed utility cause. One customer lost 13 hours from a 3-cycle sag.
- [Electric Vehicle Chargers and Residential Power Quality — A Two-Week Field Study](https://ipqdf.com/case-studies/ev-charging/electric-vehicle-chargers-and-residential-power-quality-a-two-week-field-study/) - Single-phase EV chargers caused phase imbalance, neutral overloading and THD 15–20%. Voltage unbalance peaked at 2.18% — at the EN 50160 limit.
- [Distributed Generation and Power Quality](https://ipqdf.com/case-studies/other/distributed-generation-and-power-quality/) - Vu Van Thong and Johan Driesen Source: Handbook of Power Quality Edited by Angelo Baggin, John Wiley & Sons, Ltd 1.0 DISTRIBUTION NETWORK A segment of an existing Belgian medium-voltage distribution system is used to study the power quality and voltage stability with different distributed generation (DG) technologies (Figure C16.1). The system includes one transformer
- [Data-Driven Power Quality Evaluation in a Hospital Electrical System](https://ipqdf.com/case-studies/healthcare/data-driven-power-quality-evaluation-in-a-hospital-electrical-system/) - Current TDD exceeded IEEE 519 limits, voltage unbalance non-compliant, power factor lagging — all problems internal. Voltage at meter was compliant.
- [Data Center uses Encore to monitor Demand Response Performance (Dranetz)](https://ipqdf.com/case-studies/monitoring/data-center-uses-encore-to-monitor-demand-response-performance/) - A 1.2M square ft Data Center located in Northern New Jersey was participating in a Demand Response program utilizing their backup generators as the primary means of reducing their 7MW of load. The service provider that they worked with installed telemetry metering from the utilities KYZ pulse output to report the performance to the grid
- [Data Center Commissioning Case Study (Dranetz)](https://ipqdf.com/case-studies/monitoring/data-center-commissioning-case-study-dranetz/) - Most high reliability facilities have a significant investment in UPS systems, generators and other mitigation devices in order to prevent electrical supply problems from impacting their business. However, these mitigation devices and related equipment are complex electro-mechanical systems that are themselves susceptible to failure and often do not provide any alarms or notifications when not
- [Capacitor Failure Analysis (Eaton)](https://ipqdf.com/case-studies/other/capacitor-failure-analysis-eaton/) - Steel plant automatically switched capacitor bank failing repeatedly. Even harmonic resonance from asymmetrical thyristor firing overloaded capacitors beyond design rating.
- [Automatic Distribution Fault Location (Dranetz)](https://ipqdf.com/case-studies/monitoring/automatic-distribution-fault-location/) - Consolidated Edison deployed PQView Fault Analysis to automatically locate distribution faults from power quality monitoring data — eliminating manual field dispatch.
- [AI Data Centres and Power Quality — A New Category of Grid Disturbance](https://ipqdf.com/case-studies/harmonics/ai-data-centres-and-power-quality-a-new-category-of-grid-disturbance/) - AI training creates MW-per-second load ramps, harmonic THD >5%, and simultaneous UPS disconnection risks of 2+ GW. Real Dominion Energy incident documented.
- [ADF STATCOM Reduces Flicker at WDI (Comsys AB)](https://ipqdf.com/case-studies/flicker/adf-statcom-reduces-flicker-at-wdi/) - Due to increased use of the local grid, a stricter limit of flicker emission had to be set. WDI lowered their flicker emission by installing an STATCOM solution. Background WDI (Westfälische Drahtindustrie) is a german industry group founded in 1856 and is the margest steel wire producer in Europe. The company produces steel reinforcement mesh grids
- [ADF Reduces Flicker at Henrad NV (Comsys AB)](https://ipqdf.com/case-studies/flicker/adf-reduces-flicker-at-henrad-nv/) - 01 · Context · 02 · Problem · 03 · Solution · 04 · Results · 05 · PQ Perspective · References Flicker Welding Loads Active Harmonic Filter EN 50160 · IEC 61000-4-15 Belgium Active Harmonic Filter Reduces Flicker from Radiator Production — Belgium Source: Active Harmonic Filters (manufacturer case study) · IPQDF Case Study
- [ADF Secure Food Production by Mitigating Harmonics (Comsys AB)](https://ipqdf.com/case-studies/harmonics/adf-secure-food-production-by-mitigating-harmonics/) - Processes with high automatization often contain VFDs which causes harmonics in the power supply. This can affect machineries and could cause downtime in production lines like at REWE in Dortmund. Background REWE Dortmund Großhandel eG is a federation of over 300 independent retail dealer and supplies approx. 540 grocery stores. The center is the 100.000
- [ADF Increases Water Treatment Plant Output by 30% (Comsys AB)](https://ipqdf.com/case-studies/harmonics/adf-increases-water-treatment-plant-output-by-30/) - The water treatment process features numerous variable-speed pumps to process large amounts of fluids. By optimizing the electrical behavior of pumps controlled by variable frequency drives (VFDs) with Comsys ADF Active Harmonic Filter technology, GRYAAB increased the maximum output capacity of these systems by 30%. "Thanks to ADF we can now process 30% more fluids during
- [ADF Improves dynamic test-bed (Comsys AB)](https://ipqdf.com/case-studies/harmonics/adf-improves-dynamic-test-bed/) - Within a major leading edge manufacturing company, a test bed put extreme demands on the power supply network. In this case study, an ADF installation compensates harmonics up to the 100th order resulting in significant reduction of notching. Background The development department within a major european plant owns several test benches to test certain components
- [Active Harmonic Filters In Printing Applications](https://ipqdf.com/case-studies/harmonics/active-harmonic-filters-in-printing-applications/) - Harmonic Filter Restores Power Quality and Reduces Downtime Caused by Harmonics Problems with power quality often become apparent through problems in production and surrounding equipment such as lighting. This is what happened at one of the largest printers in Holland. Background Line to line voltage with Active Harmonic Filter The printing company consists of two
- [A Practical Case of Power Quality Study (Oliveira, Jose C.)](https://ipqdf.com/case-studies/harmonics/a-practical-case-of-power-quality-study-oliveira-jose-c/) - This paper aims to present and discuss the results derived from site measurements in a typical textile factory. The monitoring program was elaborated in order to verify the factory operating conditions as long as electrical supply power quality is concerned. The investigations were carried out to obtain information in relation to voltage profile, harmonic distortions, unbalances and the risk involved in transferring the supply from one to mother distribution feeders. The study were performed to evaluate the actual situation and the necessity of any kind of power quality solution so as to improve the system reliability. Keywords: Power quality measurement, voltage quality, transients.
- [7X24 Customer Service Center (Dranetz)](https://ipqdf.com/case-studies/monitoring/7x24-customer-service-center-dranetz/) - DHL Airways opened a new 24x7 customer service center to support its US customer base. To maximize uptime and ensure high reliability, a redundant UPS system was installed, protecting both the supply and the facility loads. Integral to the facility design was the Encore Series power monitoring system from Dranetz installed on the input and
- [2 Week Energy Survey (Dranetz)](https://ipqdf.com/case-studies/monitoring/2-week-energy-survey/) - Willows Swim Club is a private, member-owned swimming and recreational facility located in central New Jersey. The swim club provides kitchen space to a local restaurant to operate a food concession. Being offered as a service to its membership, there is presently no charge for rent or utilities. However, given the current economic climate the
- [IEEE Power Quality Ecosystem](https://ipqdf.com/pq-info/standards-emc/ieee-power-quality-work-groups/) - IEEE Power Quality Ecosystem IEEE Power Quality Ecosystem From Standards → Dynamic Power Electronics–Dominated Grids Measurement & Data IEEE 1159 1159.1 / 1159.2 / 1159.3 Defines what we measure. Limits & Indices IEEE 519 IEEE 1453 IEEE 1564 Defines acceptable limits. Compatibility IEEE 1346 IEEE 1668 Defines equipment tolerance. POWER QUALITY Voltage • Harmonics •
- [Ressources](https://ipqdf.com/pq-info/ressorces/) - 04 — Resources Resources Supporting material, manufacturer references, periodicals, and specialized topics from the broader PQ field. Supporting material that complements the main technical sections — manufacturer references, periodicals, conference papers, and specialized topics that do not fit neatly into a single category. A useful secondary reference when you need to go beyond the core
- [Special High-Power Single-Phase Motors for Rural Applications](https://ipqdf.com/pq-info/pq-fundamentals/special-high-power-single-phase-motors-for-rural-applications/) - Denis Ruest, P.ENG. How to deliver substantial mechanical power from a single-phase electrical supply or a high impedance grid..
- [Complete Guide to Electric Motors for Power Quality Professionals](https://ipqdf.com/pq-info/harmonics/complete-guide-to-electric-motors-for-power-quality-professionals/) - An International Power Quality Discussion Forum (IPQDF) Technical Resource Introduction: Motors and Power Quality Electric motors consume over 45% of global electrical energy. Their selection, operation, and characteristics directly impact power quality through: Starting currents (5-10x FLC for standard motors) – per IEC 60034-12 starting performance classifications Power factor (lagging for induction motors) Harmonic injection (VFD-driven motors) – see IEC 61000-2-4 compatibility
- [The Complete Engineering Guide to System Grounding: Ungrounded, Solidly Grounded, and High-Resistance Grounded Systems](https://ipqdf.com/pq-info/pq-fundamentals/the-complete-engineering-guide-to-system-grounding-ungrounded-solidly-grounded-and-high-resistance-grounded-systems/) - The Complete Engineering Guide to System Grounding: Ungrounded, Solidly Grounded, and High-Resistance Grounded Systems Introduction · 2 · Fundamentals · 3 · Three systems · 2.5 · Power quality · 4 · Sequence networks · 5 · Retrofit · 6 · Protection · 7 · Specification · 8 · Example · Conclusion · References System
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- [International Frequency and Voltage Levels](https://ipqdf.com/pq-info/standards-emc/international-frequency-and-voltage-levels/) - Country Frequency (Hz) and tolerance (%) Household voltage (V) Commercial voltage (V) Industrialv oltage(V) Voltage tolerance(%) Albania 50 + 0.5 220/380 220/380 220/380 • 6 kV - 10 kV +5 Algeria 50 ±1 220 380/220 380/220 • 30 kV (rural)10 kV (urban) ±10 Andorra 50 +1 230400 230400 230 • 400 +6/-10 Angola 50 ±5 380/220 • 220
- [Power Quality Problems and New Solutions (ICREPQ paper)](https://ipqdf.com/pq-info/pq-fundamentals/power-quality-problems-and-new-solutions-icrepq-paper/) - Autors: A. de Almeida, L. Moreira. J. Delgado In this paper, the main Power Quality (PQ) problems are presented with their associated causes and consequences. The economic impacts associated with PQ are characterized. Finally, some solutions to mitigate the PQ problems are presented.
- [Series and Parallel Resonance](https://ipqdf.com/pq-info/pq-fundamentals/series-and-parallel-resonance/) - Author: Zbigniew Hanzelka Source: Handbook of Power Quality Edited by Angelo Baggin, John Wiley & Sons, Ltd 1. PARALLEL RESONANCE The power QFC of a capacitor bank intended exclusively for power factor correction should be selected with accuracy and care, taking into account the frequency–impedance character­istics at PCC (Figure 1). The problems which may result
- [Harmonic Effects on Induction Motors: Network Pollution, Variable Frequency Drive Stress, and Mitigation](https://ipqdf.com/pq-info/harmonics/harmonic-effects-on-induction-motors-network-pollution-variable-frequency-drive-stress-and-mitigation/) - Harmonic Effects on Induction Motors: Network Pollution, Variable Frequency Drive Stress, and Mitigation Introduction · 1 · Theory · 2 · Rotor Losses · 3 · K-Factor · 4 · Derating · 5 · Inverter Types · 6 · Common Mode · 7 · Bearing Currents · 8 · PWM Losses · 9 · Product
- [Standards & EMC](https://ipqdf.com/pq-info/standards-emc/) - 03 — Standards & EMC Standards & EMC IEC and IEEE power quality standards, EMC requirements, and international voltage and frequency norms. Navigating the standards landscape is a prerequisite for any serious power quality work. This section consolidates references to the key IEC and IEEE power quality standards, EMC requirements for commercial and automotive applications,
- [Power Quality Definitions](https://ipqdf.com/pq-info/pq-fundamentals/glossary/) - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Please note that the definitions are updated regularly (message date: February 4, 2013) A Active Filter. Any of a number of sophisticated power electronic devices for eliminating harmonic distortion.
- [Harmonic Distortion in Drives](https://ipqdf.com/pq-info/harmonics/harmonic-distortion-in-drives/) - Source: EPAC Engineering MICHAEL R. OLSON ABB Inc. New Berlin, Wis. Variable-frequency-drive- (VFD-) generated harmonics largely is a perceived, rather than real, issue. In 27 years of applying VFDs in HVAC and other applications, this author has experienced only a handful of actual harmonics problems, with all but one stemming from high levels of voltage
- [Active Harmonic Filters – Buyer’s Guide](https://ipqdf.com/pq-info/harmonics/active-harmonic-filters-buyers-guide/) - Active Harmonic Filters are growing in popularity as a method to mitigate power quality issues. There are several factors to consider when specifying an active harmonic filter. Typical applications for active filters are compensation of variable frequency drives and data-centers to reduce the load on UPS systems or compensating the effects of renewable energy sources
- [Harmonics and Power Factor Capacitors: Understanding Failure, Resonance and the Filter Solution](https://ipqdf.com/pq-info/harmonics/harmonics-and-power-factor-capacitors-understanding-failure-resonance-and-the-filter-solution/) - Introduction 01 PF Fundamentals 02 Harmonic Interaction 03 Resonance 04 Failure Modes 05 Detuned Banks 06 Passive Filters 07 Active Filters 08 Selection Guide References Power Quality Harmonics IEC 61642 · IEEE 519 Denis Ruest, IPQDF · Technical Reference Series Introduction Power factor correction capacitors are among the most widely installed pieces of electrical equipment
- [Harmonic study based on IEC standards](https://ipqdf.com/pq-info/harmonics/harmonic-study-based-on-iec-standards/) - This approach, fundamentally used in Europe, Asia, and many other regions, differs from the IEEE method in its normative structure, particularly concerning measurement techniques and spectral grouping . 1. IEC Normative Framework and Fundamental Principles Unlike the IEEE approach, which focuses on limits at the point of connection, the IEC architecture is modular. It clearly
- [Harmonic study based on IEEE and UK G5/5](https://ipqdf.com/pq-info/harmonics/harmonic-study-based-on-ieee-519-and-uk-g5-5/) - Performing a harmonic study to demonstrate compliance with utility standards is a critical technical process for connecting modern power systems to the grid. With the proliferation of inverter-based resources and non-linear loads, utilities now strictly enforce standards like IEEE 519 or UK G5/5 to ensure power quality and system stability. Below is a technical guide
- [Harmonics](https://ipqdf.com/pq-info/harmonics/) - 02 — Harmonics Harmonics Generation, propagation, resonance, and mitigation — aligned with IEC and IEEE standards frameworks. Harmonics remain the most common and most misunderstood power quality problem in modern industrial installations. This section covers harmonic generation mechanisms, propagation on distribution networks, effects on motors and capacitor banks, resonance conditions, and mitigation using passive and
- [PQ Fundamentals](https://ipqdf.com/pq-info/pq-fundamentals/) - 01 — PQ Fundamentals Power Quality Fundamentals Foundational concepts for engineers working with power quality problems in industrial and utility environments. Power quality problems are easier to solve when you have a solid grasp of the underlying phenomena. This section covers the foundational concepts — definitions, disturbance categories, grounding principles, and electromagnetic compatibility basics —
- [Power Quality Technical Information](https://ipqdf.com/pq-info/) - PQ Fundamentals Harmonics Standards & EMC Resources Technical Reference Power Quality Technical Information A structured library of power quality references, technical guides, and engineering tools — organized by topic for working engineers at all levels. 01 PQ Fundamentals Power quality problems are easier to solve when you have a solid grasp of the underlying phenomena.
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- [Calculation of solar panel output](https://ipqdf.com/renewables-energies/calculation-of-solar-panel-output/) - 📐 The Foundational Solar Output Equation A widely used formula to estimate the energy output of a photovoltaic (PV) system is the following [1]:E=A×r×H×PR However, to better integrate your specific variables, we can expand this into a more detailed form, commonly used for system sizing and implemented in recognized models like NREL's PVWatts [4]:Ppv=Htilt×Pstc×ftemp×fother​ Let's
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- [Renewable Energy at Home: How to Choose Between Solar and Wind Power](https://ipqdf.com/renewables-energies/renewable-energy-at-home-how-to-choose-between-solar-and-wind-power/) - Deciding to generate your own renewable energy is a powerful step toward energy independence and a smaller carbon footprint. However, one of the most common questions we hear is: "Should I install solar panels or a wind turbine?" The truth is, there is no single "best" option. The right choice depends entirely on your specific
- [Appliance-Style Solar Systems: The Plug-and-Play Alternative](https://ipqdf.com/renewables-energies/appliance-style-solar-systems-the-plug-and-play-alternative/) - An International Power Quality Discussion Forum (IPQDF) Technical Resource For many homeowners, the idea of mounting panels on the roof, running conduit, pulling permits, and wiring into the main electrical panel can be intimidating. Enter appliance-style solar systems—also known as solar generators, portable power stations, or all-in-one energy storage systems. These units bundle a battery, inverter, charge controller, and
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- [Automotive Electromagnetic Compatibility (EMC) Standards](https://ipqdf.com/pq-info/standards-emc/automotive-electromagnetic-compatibility-emc-standards/) - Source: Clemson Vehecular Electronics Laboratory (CVEL) Automotive Electromagnetic Compatibility (EMC) Standards CISPR (Automotive Emissions Requirements) Document Number Title CISPR 12 Vehicles, boats, and internal combustion engine driven devices - Radio disturbance characteristics - Limits and methods of measurement for the protection of receivers except those installed in the vehicle/boat/device itself or in adjacent vehicles/boats/devices CISPR 25
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- [Site de manufacturiers, références et périodiques](https://ipqdf.com/pq-info/ressorces/materiel-formation-riq-2014/site-de-manufacturiers-et-periodiques/) - Guides techniques de Schneider Electric Uninterruptible Power Supplies EUROPEAN GUIDE, CEMEP Designing modern electrical systems with transformers that inherently reduce harmonic distortion in a PC rich environment Understanding How Ferrites Can Prevent and Eliminate RF Interference to Audio Systems, Jim Brown Applications Manual and Reference Guide for Surge Protection and Line Conditioning Products, Leviton Qualité
- [Commercial Electromagnetic Compatibility (EMC) Standards](https://ipqdf.com/pq-info/standards-emc/commercial-electromagnetic-compatibility-emc-standards/) - Commercial Electromagnetic Compatibility (EMC) Standards ANSI Document Number Title C63.4 Methods of Measurement of Radio-Noise Emissions from Low-Voltage Electrical and Electronic Equipment in the Range of 9 kHz to 40 GHz IEC Document Number Title IEC 60050-161 International Electrotechnical Vocabulary. Chapter 161: Electromagnetic compatibility IEC 60060-1 High-voltage test techniques. Part 1: General definitions and test
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- [EMC and Power Quality Standards](https://ipqdf.com/pq-info/standards-emc/emc-standards/) - The following list details some of the major electromagnetic compatibility (EMC) standards in place worldwide. EMC Directive Standards Harmonized standards for the implementation of the Council Directive 89/336/EEC (2000/C 359/02). CENELEC EMC Standards EN 50065-1:2001—Signaling on low-voltage electrical installations in the frequency range 3 to 148.5 kHz—Part 1: General requirements, frequency bands, and electromagnetic disturbances;
- [Technical Methods for the Prevention and Correction of Voltage Sags and Short Interruptions (references)](https://ipqdf.com/other/technical-methods-for-the-prevention-and-correction-of-voltage-sags-and-short-interruptions-references/) - [1] Roger C. Dugan. Electrical Power Systems Quality .Editorial McGraw–Hill, 1996. [2] Ministerio de Economía. Real Decreto 1955/2000 por el que se regulan las actividades de transporte, distribución, comercialización, suministro y procedimientos de autorización de instalaciones de energía eléctrica. BOE, Diciembre 2000. [3] Comité técnico AEN/CTN 208 CEM. Características de la
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