ABB RER670 - Page 95

Transformer connection – example 4
GUID-47523478-6D93-47A3-A362-C17FE6EC3DE0 v2
IEC15000173-2-en.vsdx
132/110kV
110kV132kV
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:
 
 
 
12
12
100 100
% IDLW1 IDLW2
22
100 100
% 1 , 2 ,
22
V U S R
Diff
BaseW BaseW
V U S R
Bias
BaseW BaseW
I I I I
I
II
I I I I
I Max IDLW IDLW Max
II

     



   



IECEQUATION207 V2 EN-US (Equation 14)
1MRK 506 375-UEN A Section 6
Differential protection
Railway application RER670 2.2 IEC 89
Application manual