摘要
为研究66 kV消弧线圈接地系统单相接地故障引起的短路电弧在空气中燃弧特性,在变电站建立了人工单相接地试验模拟平台。对消弧线圈补偿电流为92.8、97.9、103.3 A 3种工况下的接地电弧进行了试验,记录了电弧的电压、电流波形。试验结果表明:接地电弧的频率特性不随消弧线圈补偿程度而变化。起始时刻的弧道电阻与合闸角度相关,合闸角度越大,弧道电阻越大。稳定燃弧状态下,半个周波的电压变化率不随消弧线圈补偿程度而变化,为120 kV/s,而电流的变化率随消弧线圈的补偿程度而增大,分别为12、14、16 k A/s;在稳定燃弧后的不同周期内,电弧伏安曲线不一致,但其发展规律相同。稳定燃弧后的电压幅值与消弧线圈补偿程度无关,其正负幅值之差为1 200 V,消弧线圈过补偿程度越大,电流幅值越大,其幅值能够达到80 A。该研究成果可为消弧线圈的参数整定提供理论参考依据。
In order to study the arcing characteristics of the short-circuit arc in the air due to the single-phase grounding of the 66 kV Petersen-coil grounding system,an artificial single-phase grounding test simulation platform is set up in the substation.The grounding arc is tested at conditions of Petersen-coil compensation current of 92.8 A,97.9 A and 103.3 A,and the voltage and current waveform is recorded.The test results show that the frequency characteristics of the grounding arc does not change with the compensation degree of the Petersen-coil.The arc channel resistance at the initial time is related to the closing angle,the larger the closing angle is,the greater the arc channel resistance is.Under the stable arcing state,the voltage variation rate of half cycle does not change with the compensation degree of Peterson-coil,which is 120 kV/s,while the current variation rate increases with the compensation degree of Petersen-coil,which are 12 kA/s,14 kA/s and 16 kA/s respectively.In different periods after the stable arcing,the arc volt-ampere curves are inconsistent,but its development is the same.The voltage amplitude after stable arcing has nothing to do with the compensation degree of the Petersen-coil.The difference between the positive and negative amplitudes is 1 200 V.The greater the overcompensation degree of the Petersen-coil is,the higher the current amplitude is,and its amplitude can reach 80 A.The research results can provide a theoretical reference base for the parameter setting of the Petersen-coil.
作者
李冠华
李雁
刘志宇
徐建源
王帅
李佳奇
LI Guanhua;LI Yan;LIU Zhiyu;XU Jianyuan;WANG Shuai;LI Jiaqi(State Grid Liaoning Electrical Power Research Institute,Shenyang 110006,China;Shenyang University of Technology,Shenyang 110870,China;State Grid Liaoning Electric Power Supply Co.,Ltd.,Shenyang 110006,China)
出处
《高压电器》
CAS
CSCD
北大核心
2024年第11期225-233,共9页
High Voltage Apparatus
关键词
消弧线圈接地系统
单相接地故障
人工接地试验
燃弧特性
电弧电阻
Petersen⁃coilgroundingsystem
single⁃phasegroundingfault
artificial groundingtest
arcing characteristics
arc resistance
