Setting parameter selected value for both Solution 1
(star conected CT)
Selected value for both Solution
2 (delta connected CT)
ConnectTypeW1 Delta (D)
STAR (Y)
1)
ConnectTypeW2 star=y star=y
ClockNumberW2 1 [30 deg lag]
0 [0 deg]
1)
ZSCurrSubtrW1 Off Off
ZSCurrSubtrW2 On
On
2)
TconfigForW1 No No
TconfigForW2 No No
LocationOLTC1 Not Used Not Used
Other parameters Not relevant for this application.
Use default value.
Not relevant for this
application. Use default value.
1)
To compensate for delta connected CTs.
2)
Zero-sequence current is already removed by connecting main CTs in delta.
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 are given in figure 57. It shall be noted that this
example is applicable for protection of autotransformer with not loaded tertiary delta
winding as well.
CT 500/5
Star
31.5/31.5/(10.5) MVA
110±11×1.5% /36.75/(10.5) kV
YNyn0(d5)
CT 200/1
Star
CT 500/5
in Delta
(DAB)
31.5/31.5/(10.5) MVA
110±11×1.5% /36.75/(10.5) kV
YNyn0(d5)
CT 200/1
in Delta
(DAB)
en06000558.vsd
IEC06000558 V1 EN
Figure 57: Two differential protection solutions for star-star connected
transformer.
Section 7 1MRK 502 071-UEN -
Differential protection
144 Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
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