IED
IED
IED
Protected zone
IEC04000209-2-en.vsdx
IEC04000209 V2 EN-US
Figure 26: One two–winding transformer in the protected zone
An alternative with two two-winding transformers in the protected zone is shown in Figure
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
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 E
Section 4
Analog and binary signal transfer for line differential protection
Communication set-up, 670/650 series
29
Application Guide
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Summary of Contents for Relion 670 series
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