Three-station switch for switchgear

Abstract

The invention discloses a three-station switch for a switchgear. The three-station switch comprises two conductors and a grounding contact. A first conductor is provided with a fixed contact; and a second conductor is pivoted with a moving contact. The moving contact is provided with a contact end part; a contact through hole with an arc-shaped central line X1 is arranged at the contact end part; and the motion trail of the X1 is S. The fixed contact is provided with an arc-shaped fixed contact section with an arc-shaped central line X2; the cross section of the vertical X2 of the fixed contact section is adaptive to the cross section of the vertical X1 of the contract through hole; and the X2 is coincided with part of the motion trail S. The grounding contact is provided with an arc-shaped grounding contact section with an arc-shaped central line X3; the cross section of the vertical X3 of the grounding contact section is adaptive to the cross section of the vertical X1 of the contract through hole; and the X3 is coincided with part of the motion trail S. The three-station switch has the advantage that: the unique layout and structure of the moving contact, the fixed contact and the grounding contact is adopted for applying the 'direct acting' ring-shaped contact with excellent electrical property and insulating property to the traditional guillotine-type three-station switch.

Description

technical field [0001] The invention relates to a three-position switch for switchgear. Background technique [0002] The existing three-position switches are mainly divided into two categories: [0003] The first type is a direct-acting three-position switch, such as the invention patent CN97115633.6 announced on June 23, 2004 by the Chinese patent database. It includes a casing, a first conductor, a second conductor and a grounding contact, the first conductor is provided with a static contact, and the second conductor is connected with a linear movable movable contact. The movable contact can move linearly relative to the second conductor, and move between a grounding position, an intermediate position and a contact position, and the intermediate position is located between the grounding position and the contact position. When the movable contact is in the contact position, the movable contact electrically contacts the static contact, the first conductor and the second ...

AI Technical Summary

Problems solved by technology

It has the following disadvantages: 1. The grounding position, intermediate position and contact position are selected by sliding the moving contact, which takes up a lot of space; 2. A transmission mechanism needs to be set between the moving contact and the power mechanism to convert the rotation into direct motion. Increase the occupied space and increase the transmission mechanism

It has the following shortcomings: the contact adopts the traditional guillotine contact, and the plane contact has large and more sharp corners in the conductive part. Generally, the rated current can only reach 2500A. The electrical performance and insulation performance are poor, and it is not easy to expand. , poor flow capacity

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