ABB RET650 Applications Manual page 94

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