基于DR技术的GIS设备内部绝缘缺陷检测
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摘要
气体绝缘全封闭组合电器(GIS)设备内部缺陷严重威胁电力系统安全运行,数字化X射线成像(DR)检测技术可实现GIS设备内部结构的可视化诊断,为设备故障诊断提供有力的技术支持。本文根据材料透射强度比可表征不同材料X射线吸收率差异特性的原理,采用材料密度和原子序数计算得到材料透射强度比,分析了DR检测技术对GIS设备各种典型缺陷检测的可行性和有效性,试验研究了施加电压对采用DR技术检测GIS内部绝缘缺陷有效性及成像情况的影响。最后对某220 kV GIS设备进行DR检测,验证了DR技术用于检测GIS内部绝缘缺陷及对缺陷进行初步判断有效可行。
The internal defects of gas insulated switchgear(GIS) equipments seriously threaten the safe and reliable operation of electric power systems. Digital radiography(DR) detection technology can realize visual diagnosis of internal structure of the GIS equipments, and provide strong technical support for equipment fault diagnosis. According to the principle that the X ray absorptivity of different materials can be characterized by transmission intensity ratio of materials, the material density and atomic number were used to calculate the material transmission intensity ratio. Moreover, the feasibility and validity of using the DR detection technology to detect typical defects of GIS equipments were investigated. The effect of applying voltage on the effectiveness of DR detection of internal insulation defects was experimentally studied. Finally, a 220 kV GIS equipment was tested by the DR technology, which proves that it is effective and feasible to use the DR technology to carry out detection and preliminary judgement for internal insulation defects of GIS equipments.
The internal defects of gas insulated switchgear(GIS) equipments seriously threaten the safe and reliable operation of electric power systems. Digital radiography(DR) detection technology can realize visual diagnosis of internal structure of the GIS equipments, and provide strong technical support for equipment fault diagnosis. According to the principle that the X ray absorptivity of different materials can be characterized by transmission intensity ratio of materials, the material density and atomic number were used to calculate the material transmission intensity ratio. Moreover, the feasibility and validity of using the DR detection technology to detect typical defects of GIS equipments were investigated. The effect of applying voltage on the effectiveness of DR detection of internal insulation defects was experimentally studied. Finally, a 220 kV GIS equipment was tested by the DR technology, which proves that it is effective and feasible to use the DR technology to carry out detection and preliminary judgement for internal insulation defects of GIS equipments.
引文
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[2]苗红霞,萧旋旋,江冰,等.基于信息融合的预装式变电站健康状态评估[J].电力系统保护与控制,2017,45(14):85-91.MIAO Hongxia,XIAO Xuanxuan,JIANG Bing,et al.State evaluation of prefabricated substation based on information fusion[J].Power System Protection and Control,2017,45(14):85-91.
[3]李乃永,张美玲,王昕,等.实现GIS故障精准辨识切除及自动恢复供电的母线保护新原理[J].电网技术,2015,39(10):2965-2971.LI Naiyong,ZHANG Meiling,WANG Xin,et al.A new bus protection principle of GIS fault accurate isolation and automatic restoration of power supply[J].Power System Technology,2015,39(10):2965-2971.
[4]RUNDE M,AURUD T,LJOKELSOY K,et al.Risk assessment basis of moving particles in gas insulated substations[J].IEEE Transactions on Power Delivery,1997,12(2):714-721.
[5]SCHLEMPER H D,FESER K.Estimation of mass and length of moving particles in GIS by combined acoustical and electrical PD detection[C]//Proceedings of the Conference on Electrical Insulation and Dielectric Phenomena-Ceidp IEEE.1996,1:90-93.
[6]SCHEI A,KYRKJEEIDE S,LARSEN V.Acoustic insulation analyzer for periodic condition assessment of Gas Insulated Substations[C]//Transmission and Distribution Conference and Exhibition 2002:Asia Pacific.IEEE/PES.IEEE,2002,2:919-924.
[7]卢启付,郑书生,李兴旺,等.GIS金属法兰孔特高频信号传播特性研究与外置式发射天线开发[J].电网技术,2013,37(8):2303-2309.LU Qifu,ZHENG Shusheng,LI Xingwang,et al.Analysis on equivalence between UHF discharge signals caused by voltage pulses[J].Power System Technology,2013,37(8):2303-2309.
[8]GENG B,LI C,QI B,et al.The comparison of sensitivity between the UHF and ultrasonic methods for partial discharge detecting in GIS[C]//Proceedings of the Electrical Insulation and Dielectric Phenomena.IEEE,2012:468-471.
[9]ZHANG W,ZHANG L,LI J,et al.The fingerprint characteristics of partial discharge on typical defects in GIS based on acoustic detection[C]//Proceedings of the Power and Energy Engineering Conference.IEEE,2012:1-5.
[10]王亮,郑书生,李成榕,等.GIS浇注孔传播内部局部放电UHF电磁波的特性[J].电网技术,2014,38(1):241-247.WANG Liang,ZHENG Shusheng,LI Chengrong,et al.Distribution of electric field strength and spectral characteristic of UHF signal of partial discharge inside GIS at resin sprue of metal ring[J].Power System Technology,2014,38(1):241-247.
[11]何喜梅,王志惠,杨小库,等.CR技术在电气设备检测中的典型应用[J].高压电器,2014,50(6):124-127.HE Ximei,WANG Zhihui,YANG Xiaoku,et al.Typical application of CR technology in the detection of electrical equipment[J].HighVoltage Paratus,2014,50(6):124-127.
[12]傅智为,许军,林一泓,等.一起500 k V输变电工程启动调试中HGIS短路事故的分析研[J].高压电器,2014,50(9):89-93.FU Zhiwei,XU Jun,LIN Yihong,et al.Analysis on a short accident of HGIS in start debugging process of the 500 kVpower transmission project[J].High Voltage Apparatus,2014,50(9):89-93.
[13]王涛云,马宏忠,崔杨柳,等.基于可拓分析和熵值法的GIS状态评估[J].电力系统保护与控制,2016,44(8):115-120.WANG Taoyun,MA Hongzhong,CUI Yangliu,et al.Condition evaluation of gas insulated switchgear based on extension analysis and entropy method[J].Power System Protection and Control,2016,44(8):115-120.