ABB ret650 - Page 94

Table 10: CT input channels used for the LV side CTs
Setting parameter Selected value for both solutions
CTprim 800
CTsec 5
CTStarPoint ToObject
5. Enter the following settings for all three CT input channels used for the HV side
CTs, see table
11.
Table 11: CT input channels used for the HV side CTs
Setting parameter Selected value for solution 1 (star
connected CT)
Selected value for solution 2
(delta connected CT)
CTprim 300
300
173
3
=
EQUATION1888 V1 EN-US (Equation 12)
CTsec
5 5
CTStarPoint From Object ToObject
To compensate for delta connected CTs, see equation 12.
6. Enter the following values for the general settings of the Transformer differential
protection function, see table 12.
Table 12: General settings of the differential protection function
Setting parameter
Select value for solution 1 (star
connected CT)
Selected value for solution 2
(delta connected CT)
GlobalBaseSelW1 CTPrim / GlobalBaseSelW1 (CTPrim /
GlobalBaseSelW1) / sqrt(3)
GlobalBaseSelW2 CTPrim / GlobalBaseSelW2 (CTPrim /
GlobalBaseSelW2) / sqrt(3)
GlobalBaseSelW3 CTPrim / GlobalBaseSelW3 (CTPrim /
GlobalBaseSelW3) / sqrt(3)
ConnectTypeW1 STAR (Y) STAR (Y)
ConnectTypeW2 delta=d
star=y
1)
ClockNumberW2 1 [30 deg lag]
0 [0 deg]
1)
ZSCurrSubtrW1 On
Off
2)
ZSCurrSubtrW2 Off Off
TconfigForW1 No No
TconfigForW2 No No
Table continues on next page
Section 6 1MRK 504 169-UEN A
Differential protection
88 Transformer protection RET650 2.2 IEC
Application manual