Mechanical interlocking device of isolation switch and breaker

Abstract

A mechanical interlocking device of an isolating switch and a breaker comprises a baffle assembly, an interlocking mechanism and an interlocking mechanism. The baffle plate assembly comprises a panelof the isolation switch and a movable baffle plate. The panel is provided with an operation hole which can be shielded by the movable baffle plate. The interlocking mechanism comprises a crank arm anda first interlocking rod, the crank arm is arranged on the transmission shaft, the crank arm can be driven by the transmission shaft to be in limiting fit with the first interlocking rod, a second interlocking rod is fixedly arranged on the first interlocking rod, and a locking piece is arranged on the second interlocking rod; and when the circuit breaker is in a switching-off state, the first interlocking rod and the crank arm are not in limiting fit, the movable baffle is opened and exposed out of the operation hole, and the locking piece enables the circuit breaker not to be switched on. When the circuit breaker is in a closing state, the first interlocking rod is in limiting fit with the crank arm, the movable baffle is closed and shields the operation hole, and the locking piece andthe closing coil are unlocked. The mechanical interlocking device is of a mechanical structure, and the locking function can still be achieved even under the condition that electric interlocking doesnot exist.

Description

technical field [0001] The invention relates to a mechanical interlocking device of a high-voltage switchgear, in particular to a mechanical interlocking device of an isolating switch and a circuit breaker. Background technique [0002] Gas-insulated switchgear gathers medium-voltage components such as busbars, circuit breakers, and isolating switches in the box, and is widely used because of its good safety, high reliability, and strong adaptability. As the core components of the gas insulated switchgear, the three-position isolating switch and vacuum circuit breaker play an important role in the control, protection, isolation and grounding functions of the switchgear. There must be a perfect equipment between the three-position isolating switch and the circuit breaker. The interlock device can ensure the reliable operation of electrical equipment. The switchgear equipped with an interlock mechanism can only operate the three-position isolating switch when the circuit break...

AI Technical Summary

Problems solved by technology

As the core components of the gas insulated switchgear, the three-position isolating switch and vacuum circuit breaker play an important role in the control, protection, isolation and grounding functions of the switchgear. There must be a perfect equipment between the three-position isolating switch and the circuit breaker. The interlock device can ensure the reliable operation of electrical equipment. The switchgear equipped with an interlock mechanism can only operate the three-position isolating switch when the circuit breaker is open, and cannot operate the three-position isolating switch when the circuit breaker is closed.

However, the interlocking device between the three-position isolating switch and the circuit breaker of the existing switchgear is not perfect, and lacks a mechanical interlocking device, especially because of the differences in the circuit breaker, the mechanical interlocking structure and connection There is a large difference in the way and lack of mechanical interlocking effect on the circuit breaker, which can only be realized by electrical interlocking. In this way, in the absence of electrical interlocking protection, it will cause misoperation due to the lack of mechanical interlocking safety incident

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