Circuit breaker closing bounce online monitoring method

Abstract

The invention discloses a circuit breaker closing bounce on-line monitoring method, which comprises the following steps of: measuring feeder line voltage when a feeder line circuit breaker is closed through a voltage sensor, transmitting a voltage signal to a signal processing module, performing filtering amplification preprocessing and AD sampling processing on the voltage signal through the signal processing module, and transmitting the processed voltage signal to a processor; the processor is used for judging the voltage signal, respectively calculating the bounce time of the circuit breaker and the jitter frequency of the feeder line voltage, and finally uploading the bounce time of the circuit breaker and the jitter frequency of the feeder line voltage to a circuit breaker monitoringplatform to predict the health state of the circuit breaker so as to judge the bounce condition of the circuit breaker at the moment; whether the breaker state is healthy is determined.

Description

technical field [0001] The invention belongs to the field of state monitoring and diagnosis of electrical equipment in a DC traction power supply system, and in particular relates to a method for monitoring the online closing bounce of a DC circuit breaker. Background technique [0002] The circuit breaker is the most critical electrical equipment in the DC traction power supply system of the subway. It is used to change the operating state of the electrical equipment during normal operation, and to put the equipment into use or out of use. In the daily operation of the DC traction power supply system, a practical circuit breaker is often required to open and close to control the on-off of the primary circuit of the system. [0003] Dangru figure 2 When a fault occurs on the line shown, the circuit breaker can quickly cut off the fault to ensure the normal use of non-faulty equipment: when the incoming line circuit breaker 1 is closed, the incoming line generates a voltage ...

AI Technical Summary

Problems solved by technology

[0004] In the operation of the circuit breaker, closing is the main operation. The repeated collision of the contacts during the closing process is called bouncing. During the bouncing process, due to repeated collisions of the contacts, the arc will not be extinguished at a small distance, resulting in electrical wear of the contacts aggravated, thereby affecting the electrical life of the circuit breaker

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