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Study on Intermittent Discharge Characteristics of Typical solid insulation Defects in Gas Insulated Switchgear

Energy Engineering 2023年第9期120卷 2115-2132页

作者： Xu Yang Jing Zhang Chuanxian Luo Qinqing Huang HuiXu Guozhi Zhang Nanrui Group(State Grid Electric Power Research Institute)Co. Ltd.Nanjing211006China Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Wuhan430074China

In response to the problem of frequent leakage and false alarm of partial discharge insulation defects in GIS,this paper conducts experimental research on intermittent discharge characteristics of common solid insulation defects in *** true GIS to build amulti-source testing platform for intermittent discharge of solid insulation defects,and using pulse current method,ultra-high frequency method,ultrasonic method,and gas characteristic component detectionmethod to study the variation law of intermittent discharge characteristics of solid insulation *** results showthat:the intermittent discharge state of metal fouling defects on the solid insulation surface decreases with the extension of the discharge time,the discharge time interval as a whole shows an increasing trend,and the metal fouling defects on the solid insulation surface in the intermittent discharge state is difficult to develop into a breakdown discharge *** overall discharge amount of air gap defects inside solid insulation also shows the law of increasing first and then decreasing,and the discharge amount of air gap defects inside solid insulation stays at a large level for a long time during intermittent discharge,and there is a risk of breakdown,and the discharge will gradually evolve into continuous discharge;ultrasonic method and characteristic component detection method cannot realize the effective perception of intermittent discharge of metal *** 50-period mapping information commonly used in the power field cannot reflect the intermittent discharge variation law of solid insulation,and the 200-period UHF mapping composed of four groups of 50-period UHF mapping data can initially derive the intermittent discharge distribution law of solid insulation *** research results of this paper are of great significance to expand the knowledge of intermittent discharge characteristics and the detection of GIS discharge defects in the field.

关键词： GIS solid insulation intermittent partial discharge multi-source characteristics

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A comparative analysis of dielectric properties of oil-paper insulation and polymer materials before and after thermal aging

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Science China(Technological Sciences) 2014年第4期57卷 738-746页

作者： WANG Wei YUE CaiPeng HE DongXin YANG Kai CHEN ShengKe Beijing Key Laboratory of High Voltage & Electromagnetic Compatibility State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Shandong Liaocheng Power Supply Company

The shortcomings of oil-immersed transformer solid insulation like low high-temperature resistance of the insulation paper and the uneven distribution of electric field caused by the large difference of dielectric constants between insulation paper and transformer oil,restricted the development of transformer with smaller size and larger *** view of this situation and the transformer’s demand for the dielectric physicochemical and mechanical property of insulation material,polycarbonate,polyester film and polyphenylene sulfide with high high-temperature resistance were chosen for the comparison analysis in this paper We did the 300-day thermal aging experiment on four samples in transformer oil under different aging temperatures of90°C,110°C and 130°C,then analyzed the changes of their dielectric *** experiment results are as follows;the permittivity and dielectric dissipation factor of the three polymer materials are apparently smaller than those of the paper both before and after 300-day aging;the volume resistivity and partial discharge inception voltage of the three materials are higher than those of the paper both before and after aging;and the breakdown field strength of polycarbonate is higher than that of the paper both before and after aging,while that of polyester film and polyphenylene sulfide are slightly lower than that of the paper.

关键词： oil-immersed transformer solid insulation polymer materials thermal aging dielectric properties

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