一种新型的直流接地故障报警电路研究

摘要

In order to timely and effectively implement alarm for DC grounding faults, and improve the reliability of the inverter system, a novel DC grounding fault alarm circuit based on bridge balance method is presented. By modifying the circuit structure, and adopting small value detection resistor, the volume is decreased and the cost is reduced. The circuit provides high applicability because in online monitoring of DC short circuit to ground, the systematic insulation is not deteriorated. The simulation model is built for simulation verification, and practical circuit is fabricated for tests to verify the effectiveness of the circuit.%为及时、有效地进行直流接地故障报警,提高变频系统的可靠性,提出了一种基于电桥平衡法的新型直流接地故障报警电路.通过改进电路结构,采用小阻值的检测电阻,减小了电路体积且降低了成本.该电路在实现在线监测直流接地短路故障的同时,不会降低系统的绝缘性,具有较强的实用性.搭建了仿真模型,对电路进行验证,并制作实际电路进行了试验,验证了电路的有效性.