A circuit breaker insulation automatic protection device

Abstract

The invention provides an automatic breaker insulation protection device and belongs to the field of machinery. According to the automatic breaker insulation protection device, a first support is arranged at the static contact end of an isolation switch body support; a second support is arranged on the first support; the second support is provided with an automatic protection device body which can coordinate with turn-on / turn-off operation actions of an isolation switch and conduct automatic unprotection and automatic protection. The automatic protection device body comprises a rigid protective sleeve rod. The middle of the protective sleeve rod is provided with a hinged point. The head end and the tail end of the protective sleeve rod can rotate around the hinged point to form ascending and descending actions of the head end and the tail end of the protective sleeve rod. A static contact protective sleeve is arranged at the part, corresponding to a static contact in position, of the head end of the protective sleeve rod. The ascending and descending actions of the head end and the tail end of the protective sleeve rod are in linage with rotation of an operating handle of the isolation switch. The operating handle of the isolation switch rotates to drive the protective sleeve rod to rotate around the hinged point and then drive the protective sleeve rod and the static contact protective sleeve at the head end of the protective sleeve rod to ascend or descend to provide automatic insulation protection for the static contact.

Description

technical field [0001] The invention belongs to the field of machinery, and in particular relates to a protection device for a static contact of a high-voltage AC vacuum circuit breaker. Background technique [0002] The ZW32E-12 circuit breaker is an intelligent outdoor post-mounted high-voltage AC vacuum circuit breaker developed by the applicant. [0003] This type of circuit breaker adopts a three-phase solid-sealed pole structure. The vacuum interrupter adopts longitudinal magnetic field arc extinguishing technology, uses silicone rubber / epoxy resin solid insulation, and uses a combination of spring operating mechanism and permanent magnet mechanism to make it have a large volume. The advantages of small size and light weight can not only be opened and closed remotely by the controller, but also can be opened and closed manually in an emergency on the spot or when the controller is out of power. Its permanent magnet mechanism adopts a linear transmission method, which ...

AI Technical Summary

Problems solved by technology

Since the static contact is exposed outdoors upwards, it is easy to accumulate rainwater or dust particles in the air, forming stains and eroding the static contact, increasing its surface contact resistance and affecting its contact effect. When the operating current of the transmission line is large, the heat generation will increase sharply due to the increase of the contact resistance and the deterioration of the contact effect. In severe cases, melting and adhesion will occur due to the high temperature rise between the static and moving contacts , affecting the normal operation of the entire switch or even equipment accidents, resulting in the interruption of normal power supply, affecting the normal operation of the power transmission circuit or transmission line

[0008] The static contacts of the existing isolating switches need to be cleaned and anti-oxidized regularly. On the one hand, the daily maintenance workload of the power supply equipment is increased. The constant erosion will also increase the contact resistance between the dynamic and static contacts, which will bring hidden dangers to the safe operation of the equipment

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