A detection method for electrical reliability of circuit breaker contacts

Abstract

The invention discloses method for detecting the electrical reliability of a circuit breaker contact, and the method comprises the steps: 1, measuring a movement distance S1 before and after the switching of a circuit breaker operating mechanism; 2, continuously applying direct current to two ends of a circuit breaker single-phase arc-extinguishing chamber, and measuring a voltage Ui across two ends of the circuit breaker single-phase arc-extinguishing chamber and a current Ii flowing through the circuit breaker single-phase arc-extinguishing chamber in real time; 3, plotting changing curves of the voltage Ui and current Ii along with time t from the operation starting moment of the driving mechanism, wherein the changing curves specifically comprise a voltage (Ui)-time (t) curve and a current (Ii)-time (t) curve; 4, finding time T1 corresponding to a first peak, and calculating actual opening travels S2 of movable and static contacts; 5, judging the ablation degree of an arc-extinguishing chamber contact. The method solves a problem that the detection of the electrical reliability of the circuit breaker contact is not convenient.

Description

technical field [0001] The invention relates to the technical field of electrical equipment performance detection, in particular to a method for detecting the electrical reliability of a circuit breaker contact. Background technique [0002] A circuit breaker is generally composed of an arc extinguishing chamber and a driving mechanism. The driving mechanism drives the moving contact to contact or move away from the static contact through the intermediate transmission mechanism, so as to realize the closing and opening movement of the circuit breaker. The driving mechanism and transmission mechanism of the circuit breaker will produce changes, especially the mechanical vibration of the circuit breaker itself and the fatigue of the spring, which will change the stroke of the moving contact. At the same time, with the increase in the number of collisions between the moving contact and the static contact, the wear and tear between the contacts and the severe arcing phenomenon w...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above technical problems, the present invention proposes a detection method for the electrical reliability of the circuit breaker contacts. By detecting the actual opening distance of the dynamic and static contacts, the opening performance of the circuit breaker can be judged. The voltage value at the closing position can be used to judge the degree of ablation of the contacts, which solves the problem that the electrical reliability of the circuit breaker contacts is difficult to detect

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