Surface-breakdown-type vacuum switch trigger electrode

Abstract

The invention discloses a surface-breakdown-type vacuum switch trigger electrode comprising a low-voltage electrode, a molybdenum ferrule, a ceramic tube, a metal trigger electrode, a molybdenum ring, a semiconductor coating layer and a trigger electrode groove. The ceramic tube is arranged in a through hole between the low-voltage electrode and the center of the molybdenum ferrule and tightly contacts with the molybdenum ferrule to guarantee electrical insulation between the low-voltage electrode and the metal trigger electrode; the metal trigger electrode is arranged in a through hole at the centers of the ceramic tube and the molybdenum ring to guarantee equal potential of the molybdenum ring and the metal trigger electrode; the molybdenum ring is arranged on the upper portion of the ceramic tube; the semiconductor coating layer is arranged on the tube wall of the ceramic tube between the molybdenum ferrule and the molybdenum ring; the direction of the semiconductor coating layer is in accordance with the direction of a gap electric field applied by a high-voltage electrode; the trigger electrode groove is formed in the low-voltage electrode on the periphery of the molybdenum ferrule, the molybdenum ring and the semiconductor coating layer. The surface-breakdown-typed vacuum switch trigger electrode can solve problems of short service life, poor high temperature resistance and easiness in damage by ablation of the existing trigger electrodes.

Description

technical field [0001] The invention belongs to the technical fields of high-voltage electrical appliances and pulse power, and more specifically relates to a trigger electrode of a creeping breakdown vacuum switch. Background technique [0002] Trigger vacuum switch (hereinafter referred to as vacuum switch) uses vacuum as the main gap insulation medium and arc extinguishing medium between high and low voltage electrodes, and uses a specially designed trigger electrode to control the switch to close. There are two main types of trigger electrode structures for vacuum switches: creeping breakdown type and field breakdown type. On the one hand, the field breakdown vacuum switch is difficult to control due to the close distance between the trigger electrode and the cathode; on the other hand, it requires a high breakdown voltage and has a problem of large dispersion. Wear-through vacuum switch. [0003] At present, the trigger electrode of the surface breakdown vacuum switch...

AI Technical Summary

Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a trigger electrode of a creeping breakdown type vacuum switch, the purpose of which is to solve the short service life of the existing trigger electrode, difficulty in ensuring stable and reliable triggering, and high temperature resistance. Poor, low mechanical strength, easy to be damaged by ablation

Images