IED
IED IED
Protected zone
IEC04000209-2-en.vsdx
IEC04000209 V2 EN-US
Figure 27: One two–winding transformer in the protected zone
An alternative with two two-winding transformers in the protected zone is shown in Figure 28.
IED
IED IED
Protected zone
IED
A B
IEC04000210-2-en.vsdx
IEC04000210 V2 EN-US
Figure 28: Two two–winding transformers in the protected zone
An alternative with one three-winding transformer in the protected zone is shown in Figure 29.
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 29: One three–winding transformer in the protected zone
Section 4 1MRK505382-UEN Rev. K
Analog and binary signal transfer for line differential protection
30 Communication set-up, 670/650 series
Application Guide
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