Isolation switch

Abstract

The invention discloses an isolating switch. The moving main contact in the isolating switch is formed by the ring fixed in the conductive tube or the ring-shaped contact fingers distributed along the circumferential direction of the conductive tube, and the moving arc contact is a contact rod extending back and forth that is movably mounted in the inner ring of the moving main contact , the front end of the contact rod is provided with an arc strike plate, and the rear end of the contact rod is provided with a guide rod segment behind the moving main contact and guided forward and backward, which is assembled on the guide frame fixed on the inner wall of the guide rod, and the guide frame There are front and rear support walls which are passed through by the guide rod section and spaced from front to back. The outer circumference of the guide rod section is protruded with a stop shoulder which is stopped by the front support wall. There is a return spring sleeved on the outer circumference of the guide rod section. In the opening state, part or all of the opening facing forward will be sealed by the arc striker, which will reduce the debris in the external space falling on the moving main contact from the forward opening of the driving main contact, and reduce the risk of falling on the moving main contact. In the gate state, the moving main contact is eroded by the surrounding environment.

Description

technical field [0001] The invention relates to an isolating switch. Background technique [0002] According to the "Twelfth Five-Year Plan" of the State Grid Corporation of China, during the "Twelfth Five-Year Plan" period, my country will build the "Zhundong-Chengdu ±1100kV UHVDC Transmission Project", which will be the world's first ±1100kV UHVDC transmission project. project, but there is no ±1100kV UHV DC transmission project at home and abroad, and no manufacturer has developed DC isolating switchgear that can meet the needs of ±1100kV UHVDC transmission project. Therefore, in order to meet the needs of the project, carry out ± The technical research of 1120kV UHV DC isolating switch has become an important task during the "Twelfth Five-Year Plan" period. [0003] At present, the isolating switch used in high-voltage switchgear, such as the structure disclosed in Chinese patent document CN101587787A, includes a moving contact and a static contact, and the moving contact...

AI Technical Summary

Problems solved by technology

However, in the open state, the contact fingers of the dynamic and static main contacts are in the exposed open space, so they are easily affected by the external environment and cause poor contact, especially in environments with high humidity and dust. In this way, the opening action of the contact fingers in the dynamic and static contacts is easily affected by the surrounding environment and becomes unreliable, so that the maintenance frequency of the isolating switch is increased, the service life is shortened, and the reliability of use is reduced.

Images