蔡春元,李昕锐,李红斌,彭昭煌,陈劲游,焦洋.10 kV高压电能计量装置电压互感器杂散电容对高压熔断器的影响研究[J].电测与仪表,2018,55(16):13-18. Cai Chunyuan,Li Xinrui,Li Hongbin,Peng Zhaohuang,Chen Jingyou,Jiao Yang.Research on the effect of a TV’s stray capacitance on the high voltage fuse in 10 kV high voltage electric energy metering device[J].Electrical Measurement & Instrumentation,2018,55(16):13-18.
10 kV高压电能计量装置电压互感器杂散电容对高压熔断器的影响研究
Research on the effect of a TV’s stray capacitance on the high voltage fuse in 10 kV high voltage electric energy metering device
The HV electric energy measuring device is an important part of 10kV distribution network, but the fuse in a transformer branch often malfunctions, endangering the safety of grid. Based on the principle of TV, this paper focuses on the overcurrent causing by the increasing of signals’ amplitude and frequency when 2 TVs are connected with the V method. That the current caused by stray capacitance of TV is greater than 1A is the key inducement for high voltage fuses to malfunction when vacuum circuit breaker action is proposed. Then, Ansoft Maxwell and ATP-EMTP are respectively used to calculate the stray parameters and to build the simulation model. During the vacuum circuit breaker’s operation, with three-phase asynchronism being taken into account, overcurrent under different circumstances are analyzed. Finally, measures based on the control of asynchronism and stray capacitance are taken to suppress overcurrent, which can reduce risks of a fuse’s malfunction and is of significance in improving the reliability of HV electric energy measuring device.
