Author Archives: Denis

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 distribution network and inside the industrial plants, the influx of digital computers and other types of electronic controls used by industries to achieve maximum productivity, the increase of the power based on renewable energy and the reduced redundancy in lines and substations, has a negative impact over the medium and low voltage distribution network power quality, as well as in the industrial customer installations. Continue reading →

Price and Performance Considerations for Harmonic Solutions

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 basic knowledge of power system harmonics. As a simple refresher – the general acceptable explanation is that harmonic currents flow or are “sourced” from loads and create voltage distortion (or harmonic voltages) as they pass through upstream power system impedance components such as cables, transformers, and generators. In general, the further away from the source of harmonic currents (i.e. the loads), the less voltage distortion you will see. Certainly exceptions exist and harmonic voltages may be “produced” by some equipment (some generators, for example) but the general discussion of this paper deals with standard considerations when dealing with typical harmonic producing loads in commercial and industrial power systems. Continue reading →