Arc time inductor and electrical life on-line monitoring system of circuit breaker

Abstract

The invention discloses an arc time inductor and an electrical life on-line monitoring system of a circuit breaker, wherein the arc time inductor of the circuit breaker mainly comprises an insulating shell, an electromagnetic shielding layer, a magnetic core and a metal induction coil, wherein the electromagnetic shielding layer, the magnetic core and the metal induction coil are arranged in the insulating shell; the electromagnetic shielding layer is attached to the side wall and the inner side of the rear end surface of the insulating shell; the cylindrical magnetic core is positioned in the center of the insulating shell; the metal induction coil spirally encircles on the periphery of the magnetic core, and both ends of the metal induction coil respectively extend out of the insulating shell to be used as two output ends. The arc time inductor of the circuit breaker is arranged near an arc extinguish chamber of the circuit breaker, the front end of the arc time inductor is opposite to a detected contact, and the output end of the arc time inductor of the circuit breaker is connected to a mainframe of the monitoring system. The invention can accurately determine the initial arc time and the arc duration in the on-off process of the circuit breaker so as to ensure the electrical life on-line monitoring and the comprehensive judgment accuracy of the circuit breaker.

Description

technical field [0001] The invention relates to a power equipment detection device, in particular to a circuit breaker arcing time sensor and a circuit breaker electric life online monitoring system. Background technique [0002] The circuit breaker is the safety guard in the power system, which plays a dual role of control and protection in the system. With the transformation of electrical appliances and maintenance systems, the maintenance system of circuit breakers is developing from planned maintenance to condition-based maintenance. The condition of the circuit breaker contact system is related to the performance of breaking and closing short-circuit current of the circuit breaker. From the perspective of cumulative electrical wear, when other conditions are constant, the electrical wear of a circuit breaker is mainly determined by the arc energy. Therefore, the method of cumulative breaking current or cumulative arc energy is currently used to evaluate the electrical ...

AI Technical Summary

Problems solved by technology

The above method can reflect the status and development trend of the electrical wear of the circuit breaker, but two problems must be solved first: ① the current collection problem; ② the determination of the arcing time and arcing time

As for the second question, in the past, the auxiliary contact was used as the signal of the starting point of arcing, but the auxiliary contact was very dispersed, and it was not synchronized with the starting point of arcing, which brought calculation and analysis errors to the monitoring system host Very large, it is difficult to ensure the detection accuracy requirements, and the general auxiliary contact can only be used as a reference signal

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