Abstract

ONE of the prime objectives in rectifier development during the past 20 years has been the decrease in frequency of arc-back. The factors involved in arc-back have received considerable attention, and it now appears that arc-backs of typical mercury arc rectifiers are caused by the following: 1. Breakdown of the mercury vapor because of inverse voltage. 2. Conditions favorable for cathode spot formation on the anode at the end of the commutation period.

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