AC high voltage SF6 circuit breaker and spring operating mechanism thereof

Abstract

The invention discloses an AC high-voltage SF6 circuit breaker and a spring operating mechanism thereof. The spring operating mechanism comprises a opening mechanism and a closing mechanism. The switching mechanism comprises a opening crank arm, a opening spring connected with the switching crank arm and providing a opening action force and an output shaft assembly providing a closing action force. The closing mechanism comprises an energy storage spring, an energy storage crank arm connected with the energy storage spring, an energy storage spindle connected with the energy storage crank armand driving the energy storage crank arm to rotate, a unidirectional clutch assembly for driving the energy storage spindle to rotate unidirectionally, and a cam fixed on the energy storage spindle and for generating closing force by the unidirectional clutch assembly. In the opening process, the speed of the opening spring can be adjusted only by the opening spring, that is, the speed of the opening spring can be adjusted by the opening spring. On the other hand, the closing spring releases and acts on the opening spring through the energy storage spring to overcome its elastic force. Under the premise of regulating the opening spring, the closing speed can be regulated by regulating the energy storage of the closing spring.

Description

technical field [0001] The invention relates to the field of high-voltage circuit breakers, in particular to an AC high-voltage SF6 circuit breaker and a spring operating mechanism thereof. Background technique [0002] A high-voltage circuit breaker (or high-voltage switch) can not only cut off or close the no-load current and load current in the high-voltage circuit, but also cut off the overload current and short-circuit current through the function of the relay protection device when the system fails. Perfect arc extinguishing structure and sufficient breaking capacity can be divided into: oil circuit breaker (more oil circuit breaker, less oil circuit breaker), sulfur hexafluoride circuit breaker (SF6 circuit breaker), compressed air circuit breaker, vacuum circuit breaker device etc. [0003] During the use of the circuit breaker, the opening and closing speed directly affects the ability of the circuit breaker to break and close the short-circuit current, which is a ...

AI Technical Summary

Problems solved by technology

The speed of opening and closing should be kept within a reasonable range. When the speed of opening and closing is too high, it will cause a large bounce, and the repeated collision between the dynamic and static contacts will aggravate the wear of the contacts; If the closing speed is too low, the fault current cannot be cut off quickly, causing accidents such as leapfrog tripping or explosion

[0004] At present, various types of high-voltage circuit breakers have been released on the market, and these high-voltage circuit breakers realize the opening and closing of the circuit breaker through the expansion and contraction of the spring. It is very important to increase the speed of opening and closing. difficulty

Because the existing circuit breaker stores energy through the compression or stretching of the spring when it is closed, and releases it through the energy storage on the spring when it is opened, so when the opening speed is too fast, the collision of the contacts will more serious

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