Influence of external axial magnetic field on the characteristics of a high-current arc in a vacuum circuit breaker | Izvestiya vuzov. Fizika. 2019. № 5. DOI: 10.17223/00213411/62/5/155

Influence of external axial magnetic field on the characteristics of a high-current arc in a vacuum circuit breaker

The effect of an external synchronous axial magnetic field on the characteristics of a vacuum arc discharge in the range of discharge currents from 6 to 14 kA is investigated. The amplitude of the magnetic field was regulated over a wide range (from 0 to 190 mT) irrespective of the discharge current, while the specific magnetic field induction (in mT/kA) remained constant during the arcing. The critical specific induction of the magnetic field which prevents the arc channel from constricting in the gap has been determined. It is shown that when the external magnetic field is applied, the anode spot is not formed, and the cathode is covered with a large number of microspots uniformly distributed over its surface. The analysis of probe currents has shown that under these conditions the density of the post-arc plasma decreases and its decay is accelerates.

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Keywords

аксиальное магнитное поле, вакуумный выключатель, сильноточная вакуумная дуга, axial magnetic field, vacuum circuit breaker, high-current vacuum arc

Authors

Name	Organization	E-mail
Schneider A.V.	High Current Electronics Institute of the Siberian Branch of the RAS	schneider@lve.hcei.tsc.ru
Popov S.A.	High Current Electronics Institute of the Siberian Branch of the RAS	Popov@lve.hcei.tsc.ru
Dubrovskaya E.L.	High Current Electronics Institute of the Siberian Branch of the RAS	selena@lve.hcei.tsc.ru
Batrakov A.V.	High Current Electronics Institute of the Siberian Branch of the RAS	batrakov@lve.hcei.tsc.ru

Всего: 4

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