Vacuum circuit breaker

Abstract

The invention relates to a vacuum breaker used for electric locomotives and motor train units, which is a vertical column and consists of a high voltage part, an insulation supporting part and a low voltage control part which are sequentially laminated from top to bottom; the vacuum breaker is characterized in that a spring mechanism in the high voltage part is an integrated three-column typed spring mechanism and consists of a closing spring, a pressing plate component which pushes through the spring, a cylindrical chamber which receives the closing spring, a connecting base which is connected with a movable contact and a spring cover which is matched with the connecting seat; the pressing plate component, the spring cover and the closing spring are arranged coaxially. The invention improves the mechanical service life which is up to more than 300,000 times of use, greatly reinforces the insulation performance, quickens the response speed, improves the on-off performance (up to 660MVA) of the product by reasonable configuration of operation force and operation speed, has an inherent opening time less than 30ms, has fast response speed and can protect the locomotive equipment and safety of personnel better.

Description

Technical field [0001] The invention relates to an electrical component for railway electric locomotives, in particular to vacuum circuit breakers used in electric locomotives and EMUs. Background technique [0002] Vacuum circuit breaker is the most important electrical component on railway electric locomotives and EMUs. It has two major functions: one is to connect and disconnect the high-voltage circuit of the locomotive or EMU, and it is the power control switch of the system; the other is to act as a locomotive. Or when the EMU fails, the main power supply can be cut off quickly, safely and effectively to protect the personal safety of operators and equipment safety. Therefore, it has the dual functions of control and protection. [0003] With the rapid development of railways, the technology of railway electric locomotives is also changing with each passing day, and the requirements for the most important protective device of locomotives-vacuum circuit breakers are getting ...

AI Technical Summary

Problems solved by technology

Its design parameters are generally: the highest working voltage is 30KV, the breaking capacity is 360MVA, the mechanical life is 200,000 times, and the pollution resistance level is only up to level III. , The failure rate of circuit breakers during locomotive operation is high, and various faults such as internal insulation breakdown, external pollution flashover, refusal to separate and close, and poor opening and closing are prone to occur, which has a great impact on the safe and reliable operation of the locomotive.

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