METHOD AND DEVICE FOR DETERMINING A PRE-INTERLOCATION TIME OF A PRE

The invention relates to a method and a device for determining a main fracture closing moment of pre-input time, and belongs to the technical field of electric power. Comprising the steps of obtaining a power supply voltage curve used for providing test current in a to-be-tested circuit breaker closing resistor test process and a current curve of a branch where the to-be-tested circuit breaker closing resistor is located, dividing the voltage curve by the current curve to obtain a dynamic resistance curve, and obtaining a main fracture closing moment according to the dynamic resistance curve. According to the method, the power supply voltage curve used for providing the test current in the test process of the closing resistor of the circuit breaker to be tested and the current curve of the branch where the closing resistor of the circuit breaker to be tested is located are obtained, the dynamic resistance curve is obtained by dividing the voltage curve by the current curve, and the accurate main fracture clos