ABB RER670 Applications Manual page 95

1MRK 506 375-UEN A
Railway application RER670 2.2 IEC
Application manual
Transformer connection – example 4
132/110kV
I
U
U
132kV
I
v
V
IEC15000173 V2 EN-US
Figure 35: Transformer connection – example 4
The HV currents I and I
V
for the winding 1 side towards the T1PPDIF function. The LV currents I
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:
  100
  
I % IDLW1 IDLW2
Diff
I
BaseW

 

I % Max IDLW 1 , IDLW 2
Bias
IECEQUATION207 V2 EN-US
shall be connected as IL1 and IL2 currents, respectively,
U
 
I I 100 I I
  
V U S R
2 I 2
1 BaseW 2




100 I I 100
 

V U
Max ,

I 2 I

BaseW 1 BaseW 2
Section 6
Differential protection
GUID-47523478-6D93-47A3-A362-C17FE6EC3DE0 v2
I
R
I
S
IEC15000173-2-en.vsdx



I I


S R

2

R
110kV
S
and I
S R
(Equation 14)
89