Table 32: General settings of the differential protection
Setting parameter selected value for both Solution 1
(wye conected CT)
Selected value for both Solution 2
(delta connected CT)
RatedVoltageW1 115 kV 115 kV
Rated VoltageW2 24.9 kV 24.9 kV
RatedCurrentW1 301 A 301 A
RatedCurrentW2 1391 A 1391 A
ConnectTypeW1 Delta (D)
WYE (Y)
1)
ConnectTypeW2 wye=y wye=y
ClockNumberW2 1 [30 deg lag]
0 [0 deg]
1)
ZSCurrSubtrW1 Off Off
ZSCurrSubtrW2 On
On
2)
TconfigForW1 No No
TconfigForW2 No No
LocationOLTC1 Not Used Not Used
Other parameters Not relevant for this application.
Use default value.
Not relevant for this application.
Use default value.
1)
To compensate for delta connected CTs.
2)
Zero-sequence current is already removed by connecting main CTs in delta.
Wye-wye connected power transformer with load tap changer and tertiary not
loaded delta winding
Single line diagrams for two possible solutions for such type of power transformer with
all relevant application data are given in figure
29. It shall be noted that this example is
applicable for protection of autotransformer with not loaded tertiary delta winding as
well.
1MRK504116-UUS C Section 3
IED application
115
Application manual
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