ABB RER670 - Page 93

InvW2Curr=No
Then the internal calculations will be:
 
 
 
1
12
1
12
100 100
% IDLW1 IDLW2
100 100
% 1 , 2 ,
Diff V S
BaseW BaseW
Bias V S
BaseW BaseW
I I I
II
I Max IDLW IDLW Max I I
II
     


   



IECEQUATION203 V2 EN-US (Equation 10)
The phase selection settings for the second instance of the T1PPDIF function shall
be:
PhSelW1=L2
PhSelW2=L1
InvW2Curr=Yes
Then the internal calculations will be:
 
 
 
2
12
2
12
100 100
% IDLW1 IDLW2
100 100
% 1 , 2 ,
Diff U S
BaseW BaseW
Bias U S
BaseW BaseW
I I I
II
I Max IDLW IDLW Max I I
II
     



   



IECEQUATION204 V2 EN-US (Equation 11)
Transformer connection – example 3
GUID-945C3857-BE28-484D-B68F-7C9C3BB05441 v2
IEC150001 72-2-en.vsdx
132/66kV
66kV132kV
I
U
v
I
U
I
S
S
V
I
R
R
IEC15000172 V2 EN-US
Figure 34: Transformer connection – example 3
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 the T1PPDIF function.
1MRK 506 375-UEN A Section 6
Differential protection
Railway application RER670 2.2 IEC 87
Application manual