ABB RELION 670 SERIES REG670 - Page 156

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 table19.
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 502 071-UUS A
Differential protection
150 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual