Arc striking device for electrical switchgear

Abstract

The invention provides an arc striking device for electric switch equipment. The arc striking device comprises a moving contact system and a fixed contact system; the moving contact system comprises a moving arc contact, a contact finger seat, and an auxiliary contact, a moving arc striking ring and a moving insulating cover which are sequentially fixed on the contact finger seat in the switch-on direction; the fixed contact system comprises a conductive support piece, and a static insulating cover, a static arc striking ring and a static arc contact which are sequentially fixed on the conductive support piece in the switch-on direction; and when the arc striking device is in a switch-on state, the moving arc contact passes through openings of the auxiliary contact, the moving arc striking ring, the moving insulating cover, the static insulating cover, the static arc striking ring and the static arc contact, and is electrically contacted with the auxiliary contact and the static arc contact. Since the moving arc striking ring and the static arc striking ring are arranged outside the moving arc contact and the static arc contact, the burning time of arc on the arc contacts when the switch cuts off fault current is shortened, the burning degree of the contacts is reduced, the contact reliability of the contacts is ensured, and the service life of the switch is prolonged.

Description

technical field [0001] The invention relates to an arc striking device of a gas-insulated high-voltage switch. Background technique [0002] When the switch breaks the fault current, the main contacts are separated first, and the fault current is borne by the arc contacts. When the dynamic and static arc contacts are separated, a high-temperature arc occurs between the contacts. The erosion will become heavier and this situation will not end until the fault current is completely interrupted. [0003] The traditional switch structure has only one pair of arc contacts. In the process of breaking the fault current, the arc always burns between the dynamic and static contacts until the arc is extinguished. This working condition requires high resistance to burnout of the contacts, especially for high current breaking. The burnout of the contacts is more serious, which directly affects the operational reliability and service life of the switch. SUMMARY OF THE INVENTION [000...

AI Technical Summary

Problems solved by technology

[0003] The traditional switch structure has only one pair of arcing contacts. During the process of breaking the fault current, the arc will always burn between the moving and static contacts until the arc is extinguished. This kind of working condition requires high resistance to burning of the contacts, especially for high-current breaking. The burning of the contacts is more serious, which directly affects the operational reliability and service life of the switch

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