7.4.2.2 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.
REFPDIF
- 1
I3PW1CT1
I3P
IdN/I
Protected
winding W1
I3PW2CT1
I3P
IdN/I
REFPDIF
- 2
Protected
winding W2
Earthing
transformer
IEC09000110-4-EN.vsd
IEC09000110-4-EN V2 EN
Figure 73: Connection of the low impedance Restricted earth-fault function
REFPDIF for a zig-zag earthing transformer
1MRK 502 071-UEN - Section 7
Differential protection
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 177
Application manual
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