Buffer used for 126kV-vacuum circuit breaker

Abstract

The invention discloses a buffer used for a 126-vacuum circuit breaker. The buffer consists of a piston cylinder, a piston rod and a moveable piston, wherein the piston rod and the moveable piston fixed at the end thereof are both arranged in the piston cylinder; and the piston cylinder is provided with a plurality of bottom orifices, middle orifices, upper orifices and top orifices from the cylinder bottom to the top in turn. Due to the adoption of the buffer of the invention, a just-opening speed is very high; the breaking time of a short arcing can be reduced; a lower average opening speedis provided for keeping a magnetic field intensity between contacts; stable and uniform combustion of an electric arc is ensured; and the breaking performance of a long arcing in an arc extinguish chamber can be increased.

Description

Technical field: [0001] The invention belongs to the field of high-voltage equipment and relates to a buffer, in particular to a buffer matching the opening characteristics of a 126kV vacuum circuit breaker. Background technique: [0002] The spring operating mechanism uses the spring as the power element to open and close the switch. In the breaking process of the vacuum circuit breaker, the mechanism needs to provide a very high opening speed on the one hand to reduce the short arc breaking time; on the other hand, it needs a relatively small average opening speed to maintain The strength of the magnetic field between the contacts ensures the stable and uniform combustion of the arc, which can increase the breaking performance of the arc extinguishing chamber for long arcing. However, because the power of the spring can only be released from small to large, there are certain limitations, so the speed of the circuit breaker must be adjusted by designing a new type of buffe...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a buffer that satisfies the opening characteristics of a 126kV vacuum circuit breaker. The buffer solves the shortcoming of the single output force of the previous spring mechanism, and combines the position of the buffer opening with the displacement of the contact, so that the The opening speed of the vacuum circuit breaker is adjusted to match the best breaking characteristics of the vacuum arc: the average speed when the contacts are just separated into the opening distance of 20mm can be greater than 3m / s, and the average speed within the opening distance of 40mm can be less than 2.7 m / s, the last contact bounce of the opening does not exceed 2mm

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