Analysis method of circuit-breaker arc-extinguishing-chamber electrical life

Abstract

The invention discloses an analysis method of a circuit-breaker arc-extinguishing-chamber electrical life. The method comprises the following steps of during an operation process that a circuit breaker arc extinguishing chamber bears a load or fault current, monitoring and recording a prebreakdown current waveform and arc burning time in a closing process of the circuit breaker arc extinguishing chamber and a breaking current waveform and the arc burning time in an opening process so as to determine energy indexes in the closing and opening processes; according to the energy indexes, analyzing and determining an ablation state of a key position of the circuit breaker arc extinguishing chamber, and then according to the ablation state, analyzing and determining a flow field characteristic index; and finally, through comparison of the flow field characteristic index and a given threshold, analyzing the electrical life of the circuit breaker arc extinguishing chamber.

Description

Technical field: [0001] The invention relates to the field of analysis and evaluation of the electrical life of an arc extinguishing chamber of a circuit breaker, and relates to an analysis method for the electrical life of an arc extinguishing chamber of a circuit breaker. Background technique: [0002] As a power transmission and transformation equipment, the circuit breaker plays a role in control and protection in the power grid, and it is indispensable in the power system. As the voltage level increases, the position of the circuit breaker becomes more critical. The reliability of the circuit breaker is particularly important to the stability of the entire system. [0003] During its operation, the circuit breaker generally carries the short-circuit current of the system, and the extinguishing of the arc is the primary task of the circuit breaker during the short-circuit breaking process. The ablation of the arc will cause permanent damage to the key components in the...

AI Technical Summary

Problems solved by technology

These types of evaluation schemes are often limited by the contact type of the arc extinguishing chamber. The actual arcing time of the circuit breaker during operation cannot be accurately calculated. It can only be roughly combined with the electrical life of the arc extinguishing chamber of the circuit breaker in the type test. gives a relative remaining amount of electrical life

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