The vacuum bottle interrupter in the vacuum bubble is an electric vacuum device which utilizes the high vacuum working insulating arc quenching medium to realize the on-off function of the power circuit by a pair of contacts sealed in vacuum.
When it breaks a certain value of the current, the static and dynamic contact in the separation of the moment, the current shrink to the contact just separated from the point, there is a sharp increase in resistance between the electrodes and the temperature increased rapidly until the occurrence of electrode metal evaporation, Extremely high electric field strength, resulting in a very strong launch and gap breakdown, resulting in 12KV vacuum interrupter, when the power frequency current close to zero, but also the opening distance increases, the vacuum arc plasma quickly spread to the surrounding, After the arc current is zero, the medium of the contact gap is rapidly changed from the conductor to the insulator, and the current is broken.
Due to the special construction of the contacts, the contact gap will produce a suitable longitudinal magnetic field during the arcing, which allows the arc to be evenly distributed on the contact surface to maintain a low arc voltage, so that the vacuum interrupter has a higher arc Post-medium strength recovery rate, small arc energy and small corrosion rate. In this way, it improves the ability and life of the vacuum interrupter to break the current.
没有评论:
发表评论