A method for preventing mis-throwing of the pressure plate at risk during the regular inspection of circuit breaker protection

Abstract

The invention discloses a method for preventing mis-switching of a risky pressure plate during circuit breaker protection and regular maintenance. The method is to add a mis-switching preventing loopinto a mis-touch risk loop protected by a circuit breaker in a shutdown interval and a relevant interval of operation and control a device outlet according to a state of a pressure plate; in a regularmaintenance state, the protection is locked; the protection is unlocked only when all the pressure plates related to the operation interval are in a quit state; when one or several of the pressure plates related to the operation are mis-switched, the protection function of the device is in the locked state and outlet operation stops. By the use of the method, the cost of each time of regular maintenance can be reduced; furthermore, the function is realized by adopting self feedback of the device, so that mis-switching of the pressure plate caused by the influence of manmade factors is avoided, and the risk of misoperation of the operation interval caused in a regular maintenance process of a line is avoided; and the method has a relatively high popularization and application value.

Description

technical field [0001] The invention relates to the technical field of relay protection, in particular to a method for preventing misuse of a risky pressure plate during regular inspection of circuit breaker protection. Background technique [0002] It is well known that the risk of accidental contact of relay protection is one of the "three mistakes", with serious consequences. For example, if the 220kV line protection is regularly inspected and the bus differential pressure plate is activated by mistake, it may cause a major accident of 220kV bus differential misoperation and jumping all intervals on the bus differential, causing irreparable economic losses to the power grid. The 220kV line protection starts the bus differential failure. the circuit as figure 1 shown. [0003] At present, when the relay protection personnel regularly check the protection (such as line protection), in order to prevent the protection action from accidentally operating the operation interva...

AI Technical Summary

Problems solved by technology

[0004] 1. The insulating tape is very easy to fall off, and after falling off, it will not be able to play the role of isolating terminals and preventing misuse of the pressure plate;

[0005] 2. Because it is an additional tool, it needs to be used every time, resulting in a waste of insulating tape, and when you forget to bring it, you will not be able to guarantee that you will not touch it by mistake;

[0006] 3. The insulation tape wrapping is extremely irregular and beautiful

[0007] Since the regular inspection of line protection is a routine operation, the risk of misoperation is huge. Therefore, it is necessary to design a method for preventing the misoperation of the risky pressure plate during the main transformer protection inspection.

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