CONTACT SYSTEM OF VACUUM ARC-QUENCHING CHAMBER FOR VOLTAGE OF 100 kV Russian patent published in 2012 - IPC H01H33/664 

FIELD: electricity.

SUBSTANCE: contact system of a vacuum arc-quenching chamber comprises mobile and fixed contact units, every of which consists of a current contact jaw in the form of a rod, a contact part with a flat surface of contact, an inductor in the form of a split ring from a material with high electric conductivity and a bushing from a material with low electric conductivity. The inductor and the bushing are arranged between the contact part and the current contact jaw and are connected with them. The bushing is installed inside the inductor and coaxially with it. The contact part is shaped as a cup turned upside down with a side cylindrical surface covering the inductor in the form of the split ring. A transition between the flat surface of contact and the side cylindrical surface is arranged with a radius of rounding of at least 5 mm. As a result at edges of the contact part and ring inductor there is no high intensity of electric field, which reduces or eliminates probability of vacuum gap breakthrough between opened contacts. Besides, vacuum breaker design will also become more compact and less material-intensive.

EFFECT: development of a contact system with high breakthrough voltage of gaps between open contacts, which makes it possible to reduce travel of contacts and dimensions of a vacuum arc-quenching chamber.

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