IED
IED IED
Protected zone
IED
A B
IEC04000210-2-en.vsdx
IEC04000210 V2 EN-US
Figure 27: Two two–winding transformers in the protected zone
An alternative with one three-winding transformer in the protected zone is shown
in Figure 28. Observe that in this case, the three-winding power transformer is seen
by the differential protection as two separate power transformers, A and B, which
have one common winding on the HV side.
IED
IED IED
Protected zone
A B
IEC04000211-2-en.vsdx
IEC04000211 V2 EN-US
Figure 28: One three–winding transformer in the protected zone
1MRK 505 382-UEN B Section 4
Analog and binary signal transfer for line differential protection
Communication set-up 670/650 series 2.2 37
Application Guide
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