Method for processing interphase short circuit of three-phase non-effective grounding power supply system

A method for processing an interphase short circuit of a three-phase non-effective grounding power supply system, wherein a plurality of controlled switches are distributed on the three-phase non-effective grounding system, and the controlled switches are capable of detecting current pulses and cutting off a circuit according to a number of the current pulses;

• when a simple two-phase or three-phase interphase short circuit occurs in a circuit, a following method (a) is used, comprising following steps:
• (a) maintaining a fault phase of the circuit to be conducting and tripping off remaining fault phases, and artificially grounding another fault phase connected to the fault phase;
• cyclically connecting and disconnecting a neutral point or a charged phase of the three-phase non-effective grounding power supply system other than the fault phase to and from the ground, to form a closed loop with the fault phase and generate current pulses, wherein a number of current pulses that triggers controlled switches at downstream of a power source to cut off is set to be smaller than that of current pulses that triggers controlled switches at upstream of the power source to cut off, and stopping the another fault phase from grounding, and stopping the charged phase or the neutral point from being connected to the ground, when a certain controlled switch reaches a trigger condition and cuts off the circuit;
• and
• when a two-phase or three-phase interphase short circuit with a grounding fault occurs in a circuit, the method (a) is used, or a following method (b) is used, comprising the following steps:
• (b) maintaining a fault phase of the circuit to be conducting and tripping off remaining fault phases;
• cyclically connecting and disconnecting a neutral point or a charged phase of the three-phase non-effective grounding power supply system other than the fault phase to and from the ground, to form a closed loop together with the fault phase and generate current pulses, wherein a number of current pulses that triggers controlled switches at downstream of a power source to cut off is set to be smaller than that of current pulses that triggers controlled switches at upstream of the power source to cut off, and stopping the charged phase or the neutral point from being connected to the ground when a certain controlled switch reaches a trigger condition and cuts off the circuit.