ABB RELION RER670, Applications Manual

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   
0
2 2
U V V U
V V
I I I I
I I I
 
   
IECEQUATION201 V2 EN-US
(Equation 8)
The phase selection settings for the T1PPDIF function shall be:
PhSelW1 =(L1-L2)/2
PhSelW2 =L1
InvW2Curr =No
Calculation of differential and bias currents:
 
 
 
1 2
1 2
100 100
% 1 2
2
100 100
% 1 , 2 ,
2
V U
Diff S
BaseW BaseW
V U
Bias S
BaseW BaseW
I I
I IDLW IDLW I
I I
I I
I IDLW IDLW Max I
I I

     
 
  
   
 
 
 
IECEQUATION202 V2 EN-US
(Equation 9)
Transformer connection – example 2
GUID-2247CE83-7174-4CE2-B8F1-51494C8F73A5 v2
IEC15000171-3-en.vsdx
66/15kV
15kV 66kV
I
U
v
I
U
I
s
S
V
R
IEC15000171 V3 EN-US
Figure 33: Transformer connection – example 2
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 current I
s
shall be
connected as IL1 current for the winding 2 side towards the T1PPDIF function.
Zero-sequence current removal is not necessary in this arrangement.
The phase selection settings for the first instance of the T1PPDIF function shall be:
PhSelW1 =L1
PhSelW2 =L1
Section 6
1MRK 506 375-UEN A
Differential protection
86 Railway application RER670 2.2 IEC
Application manual