ABB RED650 Applications Manual page 100

Section 6
Differential protection
94
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IEC05000442 V2 EN-US
Figure 41: One two–winding transformer in the protected zone
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IEC04000209 V2 EN-US
Figure 42: One two–winding transformer in the protected zone
Another alternative is with one three-winding transformer in the protected zone,
shown in Figure 43. 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.
A
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IEC15000451 V2 EN-US
Figure 43: One three–winding transformer in the protected zone
TraAOnInpCh
This parameter is used to indicate that a power transformer is included in the
protection zone at current terminal X. This can be either a two-winding transformer
Protected zone
Protected zone
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Protected zone
T
T
Line differential protection RED650 2.2 IEC
1MRK 505 393-UEN B
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IEC05000442-2-en.vsdx
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IEC04000209-2-en.vsdx
B
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IEC15000451-2-en.vsdx
M12541-239 v6
Application manual