Open-phase protection circuit using three current transformers

Published:2012/9/12 2:14:00 Author:Ecco | Keyword: Open-phase protection , three current transformers | From:SeekIC

As shown in figure, 1TA, 2TA and3TAin circuit are three current transformers, andtheir secondary circuit are connetcedin parallel, then the loop is connected to a current relay KA. Duringthe motor M is in normal operation, KA does not operate. When there is a phase failure, zero-sequence current is approximately 1.73 times ofthe rated current, then KA acts tocut off the power for motor.



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