Transformer Winding, Earthed Through Zig-Zag Earthing Transformer - ABB REG670 Applications Manual

Relion 670 series generator protection

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1MRK 502 071-UEN -

Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062

Application manual

Transformer winding, earthed through zig-zag earthing transformer

A common application is for low reactance earthed transformer where the earthing is

through separate zig-zag earthing transformers. The fault current is then limited to

typical 800 to 2000 A for each transformer. The connection for this application is

shown in figure 73.

IEC09000110-4-EN V2 EN

Connection of the low impedance Restricted earth-fault function

REFPDIF for a zig-zag earthing transformer

Differential protection

IEC09000110-4-EN.vsd

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