Automatic throw-in device of backup closing coil for 10kV vacuum breaker

Abstract

The invention discloses an automatic throw-in device of a backup closing coil for a 10kV vacuum breaker. The automatic throw-in device comprises a backup coil auto-throw-in loop, an original closing loop, a control power source and a measurement and control device. The control power source comprises a control power negative end and a control power positive end. The backup coil auto-throw-in loop is characterized in that a control relay A is serially connected between an original closing coil and the control power negative end on the basis of the original closing loop; a series loop is parallelly connected between a normally closed assistant contact QF and the control power negative end; the series loop comprises the backup closing coil and a control relay B; the original closing loop is not changed. The backup closing coil is parallelly connected on the basis of the original closing coil, the backup closing coil can be automatically switched after an original brake coil burns out, power supply reliability is improved, service life of the closing coil is prolonged, and a closing coil operating environment is improved.

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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