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In a Dyn11 why do we need to activate the zero sequence filtering when we do the differential protection settings?

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Question added by Mubarak Suliman , Electrical Distribtuion Engineer , Sudanese Electricity Distribution Company
Date Posted: 2016/03/07
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Ahmed Taha
by Ahmed Taha , Project Site Manager , Schneider Electric - Egypt

In differential protection of delta star or star delta transformers, zero sequence filtering is required in star side to make differential relay stable underthrough fault condition. As if you do not activate zero sequence filtering the differential relay will start working out of it's specified zone of protection.

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