ABB RELION RET670 Applications Manual page 158

Section 7
Differential protection
152
Table 18: CT input channels used for the HV side CTs
Setting parameter Selected value for both solutions
CTprim
CTsec
CT_WyePoint
5. Enter the following settings for all three CT input channels used for the LV side CTs,
see table "CT input channels used for the LV side
CT input channels used for the LV side CTs
Setting parameter
CTprim
CTsec
CT_WyePoint
To compensate for delta connected CTs, see equation 15.
6. Enter the following values for the general settings of the differential protection
function, see table19.
Table 19: General settings of the differential protection
Setting parameter
RatedVoltageW1
Rated VoltageW2
RatedCurrentW1
RatedCurrentW2
ConnectTypeW1
ConnectTypeW2
ClockNumberW2
ZSCurrSubtrW1
ZSCurrSubtrW2
TconfigForW1
TconfigForW2
Table continues on next page
400
5
ToObject
Selected value for Solution 1 (wye
connected CT)
1500
5
ToObject
selected value for both Solution 1
(wye conected CT)
115 kV
24.9 kV
301 A
1391 A
Delta (D)
wye=y
1 [30 deg lag]
Off
On
No
No
1MRK 504 163-UUS A
CTs".
Selected value for Solution 2 (delta
connected CT)
1500
=
866
3
EQUATION1889 V1 EN-US
5
ToObject
Selected value for both Solution 2
(delta connected CT)
115 kV
24.9 kV
301 A
1391 A
1)
WYE (Y)
wye=y
1)
0 [0 deg]
Off
2)
On
No
No
Transformer protection RET670 2.2 ANSI
Application manual
(Equation 15)