Results 41 to 50 of about 95 (94)
Gaoya dianqi, 2009 介绍了局部放电校准仪的设计原理,建立了局部放电校准仪的电路模型。通过对模型进行分析、计算,得出校准仪的输出电量与电阻分压比成正比。改变分压比就可以实现不同的输出电量。利用此校准仪进行测量实验,结果表明:其输出的实际电荷量满足IEC 60270标准中规定的指标。
王万岗 +4 more
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Calibration Proposal for UHF Partial Discharge Measurements at Power Transformers
Energies, 2019 The continuous, non-intermitted service of electrical grids relies on the reliability of their assets, e.g., power transformers. Local insulation defects can result in serve failures such as breakdowns with severe subsequent costs. The prevention of such
Martin Siegel +10 more
doaj +1 more source
Engineering Reports, Volume 6, Issue 11, November 2024.Decomposition of the artificial signal by (A) EMD, (B) EEMD, (C) CEEMDAN producing 8 IMFs plus a residual, (D) impCEEMDAN producing 7 IMFs plus a residual, (E) ECEEMDAN producing 3 IMFs plus a residual and (E) expected decomposition with 3 IMFs plus a residual signal.
Manuel Soto Calvo, Han Soo Lee
wiley +1 more source
High Voltage, Volume 9, Issue 4, Page 902-910, August 2024.Abstract With the increasing penetration of DC systems into the high voltage and medium voltage power industry, DC voltage is becoming common for distribution/transmission and to supply different typologies of loads. The allowable extent of AC ripple superimposed to DC, and its effect on insulation ageing, is a long‐term discussed topic.
Giovanni Gardan, Gian Carlo Montanari
wiley +1 more source
High Voltage, Volume 9, Issue 3, Page 674-684, June 2024.Abstract Partial discharge diagnosis is an important part of monitoring and diagnosing components of the power transmission system. Four different patch antenna structures for the detection of partial discharges are investigated. These patch antennas, which are realisable in a variety of geometric structures, are already the subject of research.
Kerstin Friebe, Frank Jenau
wiley +1 more source
High Voltage, Volume 9, Issue 2, Page 495-507, April 2024.Abstract Insulation systems in high‐voltage electric machines play a pivotal role in the reliable operation and longevity of the equipment. Mica‐based insulation materials have proven to possess and maintain excellent dielectric properties in the long run and prevent premature insulation degradation.
Shahram Negari, Davoud Esmaeil Moghadam
wiley +1 more source
IET Generation, Transmission &Distribution, Volume 18, Issue 3, Page 506-516, February 2024.During laboratory partial discharge (PD) diagnostics, the effect of harmonic components in the voltage waveform generated by variable frequency drives (VFD) fed electric motors (EMs) is often overlooked. The proposed technique includes the impact of voltage harmonics on PD activity and can be used to plan the maintenance activities that ensure the ...
Waqar Hassan +4 more
wiley +1 more source
Partial Discharge Inception and Breakdown Voltage Analysis in PCB-Based Electrode Structures
Applied SciencesThis paper investigates partial discharge (PD) characteristics and breakdown behavior in five electrode configurations fabricated from fiberglass circuit boards, including parallel electrode (PE), triangular electrode (TE), right-angled electrode (RE ...
Tzu-Ching Tai +4 more
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Analysis of Partial Discharge Measurements using Coupling Capacitor in Rotating Machine [PDF]
Iranian Journal of Electrical and Electronic EngineeringPartial discharge (PD) is a significant concern in the operation of rotating machines such as generators and motors, as it can lead to insulation degradation over time, reducing the reliability and lifespan of the machines.
Ahmad Syukri Abd Rahman +7 more
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Gaoya dianqi, 2014 局部放电激发的特高频信号大小与放电严重程度紧密相关,笔者利用220 kV GIS设备,采用特高频检测法和IEC 60270—2000检测法同时对多种典型局部放电源进行试验。通过分析特高频信号的时域峰峰幅值与局部放电量之间的关联,发现不同类型局部放电源所激发的特高频信号峰峰值与视在放电量的对应关系存在显著差异。针对不同局部放电源特有的物理结构,通过对放电机理的对比分析,给出了不同缺陷激发的特高频信号峰峰值与视在放电量关系不一致原因的定性解释。
丁登伟, 高文胜, 刘卫东
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