ABB ret650, Applications Manual

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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