ABB RER670 - Page 92





0
22
UV VU
VV
II II
III

 
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:



12
12
100 100
%12
2
100 100
%1,2 ,
2
VU
Diff S
BaseW BaseW
VU
Bias S
BaseW BaseW
II
I IDLW IDLW I
II
II
I IDLW I DLW Max I
II

 











IECEQUATION202 V2 EN-US (Equation 9)
Transformer connection – example 2
GUID-2247CE83-7174-4CE2-B8F1-51494C8F73A5 v2
IEC15000171-3-en.vsdx
66/15kV
15kV66kV
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