摘要
针对自动重合闸盲目重合故障会给电网带来二次冲击的问题,设计一种针对各类故障只进行一相重合的探测式故障判断方法。线路中出现故障时会发生三相跳闸,延长一段时间后进行合闸再判断故障特征。选择10 kV电网模型作为测试对象,构建电压等级为10 kV的仿真测试模型。研究结果表明:存在瞬时故障与永久A相与接地之间(AG)故障时,电容计算结果可能为负值;永久故障时的电容可能为负值,形成明显波动。所提出的方法可满足可靠性要求,具备优异耐过渡电阻性能,相间故障判断依据可以实现故障的准确判断。
Aiming at the blind reclosing faults in automatic reclosing can cause secondary impacts on the power grid,a detection-type fault judgment method that only performs one-phase reclosing for various faults is designed.When a fault occurs in the line,a three-phase tripping happens,the fault characteristics can be judged by closing the switch after a delay of some time.The 10 kV power grid model is selected as the test object,and a simulation test model with a voltage level of 10 kV is constructed.The research results show that in the presence of instantaneous faults and permanent phase A and grounding(AG)faults,the capacitance calculation results may be negative.When there is a permanent fault,the capacitance may be negative,causing significant fluctuations.The proposed method can meet the reliability requirements and has excellent resistance to transition resistance,achieving accurate fault judgment.
作者
金红华
金路
唐伟刚
郝建华
黄维持
JIN Honghua;JIN Lu;TANG Weigang;HAO Jianhua;HUANG Weichi(Shaoxing Power Supply Company of State Grid Zhejiang Electric Power Co.,Ltd.,Shaoxing 312000,China;School of Electrical Automation and Information Engineering,Tianjin University,Tianjin 300072,China)
出处
《微型电脑应用》
2025年第12期171-174,共4页
Microcomputer Applications
关键词
电网
接地故障
故障判断
分相开关
power grid
grounding faults
fault judgment
phase-separated switch
