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Experimental study on multi-fracture vacuum fast isolating switch

Article From:HENAN CHANGZHENG ELECTRIC CO., LTD
1. Content introduction

  The fast isolation switch is one of the key components of the hybrid DC circuit breaker, and its opening and closing time is within a few milliseconds, and the conventional circuit breaker is difficult to provide such a fast operating speed. Based on the experience of vacuum switch development, this paper analyzes the demand of DC fast isolation switch, and conducts a series of targeted tests on the application of vacuum small gap in DC isolation and arc-free breaking. At the same time, the problem of multi-fracture voltage balancing is solved by means of test and theoretical analysis. The medium voltage vacuum switch can be extended to the high voltage DC isolation switch application field. A 200 kV DC fast isolating switch with opening speed less than 3 ms is developed, and the scheme has the advantage of easy expansion to high voltage, which can meet the application requirements of hybrid DC circuit breaker.


2. Main contents

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