Method and system for rapid prediction and protection of short-circuit current in a circuit

Abstract

The invention relates to a circuit's short circuit current quick forecasting and protecting method and a system, wherein the system comprises: a short circuit detecting instrument, a basic data acquiring module, a short circuit current calculating module, a first determining module, a second determining module, a control module and a breaker. Through the acquisition of the current sample data in a short window period after the occurrence of short circuit in a to-be-detected area and according to the current sample data, the short circuit current value is calculated; when the short circuit current value is around the rated breaking current of the breaker, it is not possible to determine whether to break the circuit or not accurately. In this case, the current sample data in a long window period is acquired, and through the current sample data, the short circuit current's precise value is calculated; and through the comparison between the current value in the long window period with the rated breaking current value of the breaker, it is possible to determine how to send a control command to the breaker so as to quickly and precisely break the breaker to protect the circuit in trouble.

Description

technical field [0001] The invention relates to the field of circuit break protection, in particular to a method and system for rapid prediction and protection of circuit short-circuit current. Background technique [0002] With the development of urbanization, the load in my country's urban circuits has increased rapidly, and the load has become more dense, resulting in a continuous increase in the level of short-circuit current, so the harm caused by short-circuit current has become increasingly prominent. In addition to the short-circuit current caused by the aging of equipment and lines, the electromagnetic ring network formed by the joint input of different high and low voltage levels in the power system will also increase the level of short-circuit current. Today, the rated value of the operating level of the power system is not enough for actual operation. . In order to ensure the stable operation of the power system, it is necessary to cut off the short-circuit curr...

AI Technical Summary

Problems solved by technology

Disconnecting the circuit through the circuit breaker can effectively prevent the short-circuit current from harming the current line, but if the short-circuit current level in the line exceeds the rated current of the circuit breaker for a long time, it will cause rapid heating of the circuit breaker, and even cause the circuit breaker to explode

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