Transformer connection – example 4
GUID-47523478-6D93-47A3-A362-C17FE6EC3DE0 v2
IEC15000173-2-en.vsdx
132/110kV
110kV
132kV
I
U
v
I
U
I
S
S
V
I
R
R
IEC15000173 V2 EN-US
Figure 35:
Transformer connection – example 4
The HV currents I
V
and I
U
shall be connected as IL1 and IL2 currents, respectively,
for the winding 1 side towards the T1PPDIF function. The LV currents I
S
and I
R
shall be connected as IL1 and IL2 currents, respectively, for the winding 2 side
towards T1PPDIF function.
To calculate zero sequence current reduction for U, V, R and S phases, see
connection example 1.
The phase selection settings for the first instance of the T1PPDIF function shall be:
PhSelW1
=(L1-L2)/2
PhSelW2
=(L1-L2)/2
InvW2Curr
=No
Then the internal calculations will be:
1
2
1
2
100
100
%
IDLW1 IDLW2
2
2
100
100
%
1 ,
2
,
2
2
V
U
S
R
Diff
BaseW
BaseW
V
U
S
R
Bias
BaseW
BaseW
I
I
I
I
I
I
I
I
I
I
I
I
Max IDLW
IDLW
Max
I
I
IECEQUATION207 V2 EN-US
(Equation 14)
1MRK 506 375-UEN A
Section 6
Differential protection
Railway application RER670 2.2 IEC
89
Application manual
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