ABB Relion 670 Series Applications Manual page 502

Section 17
Monitoring
1. Ensure that HV & LV CTs are connected to 5 A CT inputs in the IED.
2. For the second solution, make sure that HV delta connected CTs are DAC connected.
3. For wye connected CTs, make sure how they are wye-connected (i.e., grounded) to/from the
protected transformer.
4. Enter the settings for all three CT input channels used for the LV side CTs as shown in
56.
Table 56: LV side CTs input channels
Setting parameter
CTprim
CTsec
CTStarPoint
5. Enter the settings for all three CT input channels used for the HV side CTs as shown in
57.
Table 57:
Setting parameter
CTprim
CTsec
CTStarPoint
6. Enter the values for the general settings of the PTRSTHR (51TF) function as shown in
58.
Table 58: 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
Example 2: Delta-wye connected power transformer without tap charger
Single line diagrams for two possible solutions for such type of power transformer with all
relevant application data is given in
496
HV side CTs input channels
Selected value for solution 1 (wye
connected CT)
300
5
FromObject
Select value for solution 1 (wye
connected CT)
WYE (Y)
Delta
1 [30 deg lag]
Enabled
Not in use
Figure
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Selected value for both solutions
800
5
ToObject
225.
1MRK 511 401-UUS F
Table
Table
Selected value for solution 2 (delta
connected CT)
300
=
173
3
EQUATION1888 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)
Disabled
Not in use
GUID-0E5F0588-DB5F-4B6E-ADE2-8190D5D9AA99 v1
Bay control REC670
Application manual