ABB RELION RET670, Applications Manual

Page: 158 / 1016

Table 18: CT input channels used for the HV side CTs
Setting parameter Selected value for both solutions
CTprim 400
CTsec 5
CT_WyePoint ToObject
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 CTs" .
CT input channels used for the LV side CTs
Setting parameter Selected value for Solution 1 (wye
connected CT)
Selected value for Solution 2 (delta
connected CT)
CTprim 1500
1500
866
3
=
EQUATION1889 V1 EN-US
(Equation 15)
CTsec 5 5
CT_WyePoint ToObject ToObject
To compensate for delta connected CTs, see equation 15 .
6. Enter the following values for the general settings of the differential protection
function, see table
19 .
Table 19: 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
Table continues on next page
Section 7
1MRK 504 163-UUS A
Differential protection
152 Transformer protection RET670 2.2 ANSI
Application manual