Circuit breaker body three-phase inconsistency protection test box

Abstract

The invention discloses a three-phase inconsistency protection test box for a circuit breaker body, which relates to the field of power system relay protection acceptance and regular inspection work. The box includes three liquid crystal display timers, and the display part is embedded in a panel for external display. Each liquid crystal The display timer includes a pair of power contacts, a pair of start-up contacts and a pair of stop-watch contacts. There are three pairs of start-up jacks and three pairs of stop-watch jacks on the panel, and each pair of start-up jacks is connected to a pair of Open meter contact, each pair of stop meter jacks is connected to a pair of stop meter contacts; there are four jacks THG, THA, THB, THC and three buttons STA, STB, STC on the panel, inside the THG jack It is connected to the same end of the three buttons, and the three jacks of THA, THB, and THC are respectively connected to the other end corresponding to the three button switches of STA, STB, and STC; the panel is also equipped with a power switch and a grounding jack for the test box shell. AC 220V power supply is adopted. The invention improves the efficiency of regular inspection of protection, shortens the maintenance time during power outages, and enhances the operation reliability of the power grid.

Description

technical field [0001] The invention relates to the field of acceptance and regular inspection of relay protection in electric power systems, in particular to a three-phase inconsistency protection test box for a circuit breaker body, which is suitable for regular inspection tests for the three-phase inconsistency protection of the circuit breaker body. Background technique [0002] In the power system, switches with a voltage level of 220kV and above generally use a circuit breaker operated in separate phases. In order to prevent non-full-phase operation due to the inconsistency of the three-phase positions of the circuit breaker, that is, the possibility of disconnecting one or two phases of the three phases, As a result, the circuit breaker will malfunction or refuse to operate, and the circuit breaker should be protected by three-phase inconsistency. According to GB / T 14258-2006 "Technical Regulations for Relay Protection and Safety Automatic Devices": 220~500kV circuit ...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a three-phase inconsistency protection test box for the circuit breaker body in order to solve the problem of carrying out regular inspection tests for the three-phase inconsistency protection of the circuit breaker body to improve the efficiency of the regular inspection of protection and reduce the occurrence of electric shock accidents for staff

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