Mechanical interlocking mechanism of circuit breaker and three-position isolation switch

Abstract

The invention provides a mechanical interlocking mechanism of a circuit breaker and a three-position isolation switch. The mechanical interlocking mechanism is simple and reliable, and misoperation of the circuit and the three-position isolation switch can be effectively prevented due to no breaking-closing in place during the isolation and grounding operation process. The mechanical interlocking mechanism comprises a circuit breaker interlocking device, an interlocking plate, a pin, a valve and a position recognition device, wherein the circuit breaker interlocking device is arranged on the circuit breaker, the valve and the position recognition device are arranged on the three-position isolation switch, one end of the interlocking plate is connected with the circuit breaker interlocking device, the other end of the interlocking plate is connected with the position recognition device, the interlocking plate is fixedly connected with the pin, the valve is rotatably or horizontally arranged, a first gap, a second gap and a third gap are sequentially formed in an edge profile, the second gap of the valve is correspondingly clamped with the pin when an isolation operation shaft and a ground operation shaft of the three-position isolation switch are simultaneously blocked by the valve, the third gap of the valve is correspondingly clamped with the pin when the isolation operation shaft is exposed, and the first gap of the valve is correspondingly clamped with the pin when the ground operation shaft is exposed.

Description

technical field [0001] The invention relates to a high-voltage switchgear, in particular to a mechanical interlocking mechanism of a circuit breaker and a three-station isolating switch. Background technique [0002] For a switchgear equipped with a three-station isolating switch, it is not allowed to operate the three-station isolating switch when the circuit breaker is in the closed state, and it is allowed to operate the three-station isolating switch when the circuit breaker is in the open state; the three-station isolating switch The circuit breaker can only be closed after the operation is in place, and the circuit breaker cannot be closed if the operation is not in place. In addition, when the circuit breaker is closed, the closing circuit breaker operation cannot be performed, the isolation operation cannot be performed when the grounding operation is not in place, and the grounding operation cannot be performed when the isolation operation is not in place. [0003]...

AI Technical Summary

Problems solved by technology

[0002] For a switchgear equipped with a three-station isolating switch, it is not allowed to operate the three-station isolating switch when the circuit breaker is in the closed state, and it is allowed to operate the three-station isolating switch when the circuit breaker is in the open state; the three-station isolating switch The circuit breaker can only be closed after the operation is in place, and the circuit breaker cannot be closed if the operation is not in place

In addition, when the circuit breaker is closed, the closing circuit breaker operation cannot be performed, the isolation operation cannot be performed when the grounding operation is not in place, and the grounding operation cannot be performed when the isolation operation is not in place

[0003] Many isolation and grounding manual operations in the prior art do not have the functions of automatic locking and automatic disconnection. The manual operation handle can also be pulled out before the manual operation is completed. If there is no perfect interlock function, it is easy to misuse

The utility model patent "a mechanical interlock mechanism between a circuit breaker and a three-position isolating switch" (patent number: CN200520042876.9) realizes the connection between the isolating switch and the circuit breaker through a connecting rod between the circuit breaker and the three-position isolating switch. The interlocking of the three-position isolating switch is by restricting the rotation of the three-position output shaft, which is a passive interlock and has poor reliability.

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