Emergency processing method for ground loss of direct current system of transformer substation

The invention relates to a transformer substation direct current system ground loss emergency processing method. According to the method, the direct current grounding fault is searched in a direct current load mode, and after a direct current loss point is determined, if the load cannot quit operation, a DC-AC-DC isolation device can be directly and temporarily used for supplying power to the load and isolating the loss point, so that the situation that the direct current system develops into two-point grounding to cause maloperation or refusal to operate of equipment is prevented, and the reliability of the system is improved. And when the equipment allows power failure, processing is carried out. 本发明涉及一种变电站直流系统失地应急处理方法。通过直流负载的方式实现直流失地故障的查找，并在确定直流失地点后，若负载无法退出运行，可以直接暂时用DC-AC-DC隔离装置来为该负载供电并隔离该失地点，防止该直流系统发展成两点失地，造成设备的误动或拒动，待该设备允许停电时再进行处理。