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Comparative analysis of online monitoring methods for transformer insulation performance of 330-750kV substation

Journal of Measurement Science and Instrumentation 2016年第1期7卷 71-77页

作者：子贡董海鹰任伟兰州交通大学自动化与电气工程学院甘肃兰州730070 国网甘肃省电力公司检修公司甘肃兰州730070

The online-monitoring methods for insulation performance of current transformers of 330-750 kV substation are analyzed and *** effectiveness and availability of each method are *** features,advantages and disadvantage... 详细信息

关键词： continuous control insulation performance online monitoring substation

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insulation Properties and Degradation Mechanism for XLPE Subjected to Different Aging Periods

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CSEE Journal of Power and Energy Systems 2023年第5期9卷 1959-1967页

作者： Qian Wang Rui Liu Sichen Qin Xi Chen Zicai Shen Zhe Hou Zeli Ju the Department of Electrical Engineering Xi’an University of TechnologyXi’an 710048China the Beijing Institute of Spacecraft Environment Engineering Beijing 100094China the State Grid Shaanxi Electric Power Research Institute Xi’an 710100China

Due to its excellent insulation and mechanical properties,cross-linked polyethylene(XLPE)is widely used as the insulation candidate of power cables in power transmission and distribution ***,its performance can be affected due to various stresses,which endangers safe operation of the power system in *** this paper,dielectric and insulation properties of XLPE materials of 110 kV cables with the service lives of 0,15,and 30 years were tested and *** show that with increase of service life,dielectric loss caused by the polarization process increases significantly,and dielectric strength decreases as *** frequency breakdown field strength and crystallinity decrease significantly,and carbonyl index *** degradation process of XLPE can be divided into two stages:the structure of the crystalline region of the original sample is relatively complete,and loss can be almost *** long-term service,the crystallization region is destroyed,and thermal oxygen reaction *** force is weakened,which makes breakdown easier to ***,there is no direct relation between the carbonyl index and macroscopic *** paper reveals the deterioration law of the XLPE cable insulation,which provides a theoretical basis for evaluating cable aging condition and is of great significance to improve cable operation safety and maintenance quality.

关键词： Crosslinked polyethylene dielectric properties insulation performance microstructure power frequency breakdown

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Partial Discharge Measurement and Analysis in High Voltage IGBT Modules Under DC Voltage

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CSEE Journal of Power and Energy Systems 2018年第4期4卷 513-523页

作者： Pengyu Fu Zhibin Zhao Xiang Cui Teng Wen Haoyu Wang Xuebao Li Peng Zhang State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China Global Energy Interconnection Research Institute State Grid Corporation of ChinaBeijing 102211China

insulation performance of high voltage IGBT modules is one of the key attributes in power system ***,the existing standards of IGBT devices and research on the evaluation of insulation performance of high voltage IGBT modules are insufficient;for example,partial discharge resistance under DC voltage blocking condition is not *** this paper,a new test was proposed to allow the measurement of partial discharges in all the components of IGBT modules under DC *** topology of the measuring circuit is arranged in the polarity discrimination way to exclude the interference,and the voltage and discharge current waveforms during the partial discharge process are measured by the wideband time domain measurement *** to the proposed test,the discharge phenomenon of the IGBT modules below the rating voltage were detected.A comprehensive waveform analysis on the voltage and discharge current was performed,and the influence of the applied voltage on the waveform parameters was *** waveform parameters are influenced by the applied voltage and insulation structure,which enables the discrimination of the causes of the observed partial discharge in the IGBT module under DC voltage by the waveform analysis *** on the waveform analysis technique,the types and causes of the observed partial discharges were discussed and inferred,and the correctness of the inference was further verified by *** proposed test and waveform analysis technique provide the possibility to evaluate and distinguish partial discharges in the high voltage IGBT module under DC voltage,which may be helpful to insulation performance evaluation and insulation defect diagnosis in high voltage IGBT module.

关键词： DC voltage high voltage IGBT module insulation performance partial discharge measurement waveform analysis wideband time domain measurement

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