健康管理 & Institutional

病院, medical facilities, universities, 軍事的, research

学術機関の配電システムの電力品質 — スルタン・カブース大学

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Full campus PQ audit at Sultan Qaboos University, Oman — 33 kV/11 kV/415 V distribution system. Non-linear loads: PV inverters, UPSシステム, VFD chillers, and hundreds of switch-mode power supplies in computer labs. THDI ranged from 2–10%, TDD from 2–8% across measurement points. Main substations compliant with IEEE 519 due to harmonic aggregation cancellation — but individual buildings exceeded 8% at peak load. Key lesson: the THD vs. TDD distinction prevents false alarms. The study establishes a pre-DER baseline before planned large-scale PV integration.

Data-Driven Power Quality Evaluation in a Hospital Electrical System

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Full PQ audit at University of Lampung Hospital, インドネシア. Voltage and frequency compliant at the meter — but current TDD exceeded IEEE 519 limits many times over, voltage unbalance non-compliant, power factor lagging. All problems originated inside the facility from non-linear loads: SMPS, UPS, VFDは, imaging equipment.

Power Quality Issues in Medical Facilities — EKG Malfunction

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A hospital EKG machine produced unreliable results. Signal wiring routed parallel to the power cord created inductive coupling — a classic internal EMC failure invisible to utility PQ standards. Root cause: wiring practice, not utility supply quality. 75% of medical facility PQ problems are internal wiring and grounding issues.

高調波発生, 伝播と非線形負荷でパージテクニック

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Saudi Arabia academic review of harmonic generation mechanisms, propagation paths, and mitigation techniques for non-linear loads — covering passive filters, active filters, hybrid approaches, and multi-pulse converters. Provides theoretical grounding for harmonic mitigation selection, with worked examples for different industrial load types. King Saud University publication.

誤動作医療機械 (まぐれ当たり)

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A building manager with widespread electrical malfunctions and three electricians who quit — none could identify the problem. A systematic approach starting with current measurement revealed a tripped GFCI with high neutral current feeding a malfunctioning medical device. Classic case demonstrating that systematic PQ investigation beats component replacement as a troubleshooting strategy.

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