应用于配电网单相接地在线故障指示器电源

摘要

The one-way ground fault indicator of the distribution network has found wide applications in distri- bution automation, but the energy it needs for online fault diagnosis can not rely on the low-vohage side. It can only be obtained in the high voltage side. Therefore, we have designed a special power taking circuit and control cir- cuits. According to the needs of various components of the fault indicator the power supply can provide 5 V, - 4 V and 3.2 V three-way voltage to meet the needs of the fault indicator signal in its acquisition, processing and wireless communications. The whole experimental results show that the power supply can provide a power of not less than 1.5 W when the current of overhead lines change from 15 A to 800 A. It can meet the requirement of the fault indicator.%配电网单向接地故障指示器在配电网自动化方面应用广泛，但其在线故障诊断所需的能量不能靠低压侧供给，只能在高压端获取，因此文中设计了特殊的取电电路和控制电路，根据故障指示器各个元器件的需求，此取能电源可以为故障指示器提供5V、-4V和3．2V3路电压，以满足故障指示器信号采集和处理以及无线通信的需要。整机实验结果表明，该取能电源在15—800A的变化范围内，能提供不少于1．5W的功率，可满足故障指示器的需要。