10kv vacuum circuit breaker spare closing coil automatic input device

Abstract

The invention discloses an automatic input device for a spare closing coil of a 10kV vacuum circuit breaker. The coil automatic input circuit is to connect the control relay A in series between the original closing coil and the negative terminal of the control power supply on the basis of the original closing circuit; and connect a series circuit in parallel between the normally closed auxiliary contact QF and the negative terminal of the control power supply; the series connection The circuit includes the spare closing coil and control relay B, without changing the original closing circuit. The invention connects the spare closing coil in parallel on the basis of the original closing coil, can realize the automatic switching function of the spare closing coil after the original closing coil is burned, improves the reliability of power supply, improves the service life of the closing coil, and improves the working environment of the closing coil.

Description

technical field [0001] The invention relates to a measurement control system for protecting the operating mechanism of a circuit breaker, in particular to a control device for automatic input of a spare closing coil in the operating mechanism of a 10kV vacuum circuit breaker. Background technique [0002] With the development of the economy and society, the demand for electricity in the power system is also increasing, and the requirements for the safe and reliable operation of the power system are also getting higher and higher. The 10kV vacuum switch is widely used in the power system, so the 10kV vacuum switch plays a vital role in the reliable operation of the power grid. [0003] 10kV vacuum circuit breaker consists of three parts: circuit breaker body, operating mechanism and power supply. The reliability of the 10kV vacuum circuit breaker body has reached a very high level, and its mean time between failures has reached decades. However, in actual operation, the rel...

AI Technical Summary

Problems solved by technology

[0006] However, if the energy obtained by the connecting rod from the coil is not enough, the mechanism is stuck, or the insulation of the coil is damaged, the coil will be energized for a long time and work in a short-circuit state, which will burn the coil

At the same time, in actual use, there are still man-made damages to the coil due to misoperation, multiple openings and closings in a short period of time, etc.

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