ABB Relion 670 Series Applications Manual page 530

Section 18
Monitoring
Table 81:
Setting parameter
CTprim
CTsec
CTStarPoint
6. Enter the values for the general settings of the PTRSTHR function as shown in
Table 82: Through fault monitoring function general settings
Setting parameter
ConnTypeW1
ConnTypeW2
ClockNumberW2
ZSCurrCor
OLTCWinding
1) To compensate for delta connected CTs
2) Zero-sequence current is removed by connecting main CTs in delta, so winding current with zero
Example 3: Star-star connected power transformer with load tap changer and tertiary
not loaded delta winding
Single line diagrams for two possible solutions for such type of power transformer with all
relevant application data is given in
524
LV side CTs input channels
sequence current is not possible
This example is also applicable for autotransformer not loaded with tertiary
delta.
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Selected value for solution 1 (star
connected CT)
1500
5
ToObject
Select value for solution 1 (star
connected CT)
Delta
WYE (Y)
1 [30 deg lag]
On
Not in use
Figure 255.
1MRK 511 401-UEN Rev. K
Selected value for solution 2
(delta connected CT)
1500
=
866
3
EQUATION1889 V1 EN-US
(To compensate for delta
connected CTs)
5
ToObject
Table
Selected value for solution 2
(delta connected CT)
WYE (Y)
1)
WYE (Y)
1)
0 [0 deg]
2)
Off
Not in use
GUID-87DDECC6-6277-4F34-A8E4-934F56E6CC56 v1
Bay control REC670
Application manual
82.