Monostable permanent magnet mechanism provided with combined breaking springs and used for high-voltage circuit breaker

Abstract

The invention discloses a monostable permanent magnet mechanism provided with combined breaking springs and used for a high-voltage circuit breaker. The mechanism comprises a non-magnetic casing (2), a permanent magnet retaining mechanism (3), an electromagnetic driving mechanism (4), a combined breaking spring system (5), a non-magnetic material cushion block (10) and a guide bar (1), wherein the permanent magnet retaining mechanism (3), the electromagnetic driving mechanism (4), the combined breaking spring system (5) and the non-magnetic material cushion block (10) are arranged in the non-magnetic casing (2); the guide bar (1) penetrates the non-magnetic casing (2) and is in sliding connection with the non-magnetic casing (2); the permanent magnet retaining mechanism (3) and the electromagnetic driving mechanism (4) are isolated by the non-magnetic material cushion block (10); the combined breaking spring system (5) is arranged in the permanent magnet retaining mechanism (3) and the electromagnetic driving mechanism (4) along the guide bar (1). By means of the breaking spring system combined by a whole-course breaking spring and an interval breaking spring, the counter force on the closing front half section is reduced, and accordingly, the closing current peak value is decreased, the closing time is shortened, and energy consumed by closing is reduced.

Description

technical field [0001] The invention relates to a monostable permanent magnet mechanism for a high-voltage circuit breaker combined with an opening spring, belonging to the field of high-voltage vacuum circuit breakers. Background technique [0002] With the advantages of small size, light weight, suitable for frequent operation, and no maintenance for arc extinguishing, vacuum circuit breakers quickly occupied the medium-voltage circuit breaker market and further developed into the high-voltage field. The operating mechanism of the vacuum circuit breaker usually has three types: electromagnetic type, spring type and permanent magnet type. Among them, the permanent magnet operating mechanism has attracted people's attention increasingly due to its advantages of high reliability, low energy consumption, maintenance-free, and synchronous operation. Among them, compared with the bistable permanent magnet mechanism, the opening spring is added to the monostable permanent magnet...

AI Technical Summary

Problems solved by technology

However, for the monostable permanent magnet mechanism used in high-voltage circuit breakers, due to the large stiffness coefficient of the opening spring, energy storage needs to be carried out when closing, resulting in a large increase in the energy required for the closing process, and the closing time will also increase. The final speed of the gate is also too large, which increases the impact on the mechanism

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