To calculate the zero sequence current reduction for U and V 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
InvW2Curr
=No
Then the internal calculations will be:
1
1
2
1
1
2
100
100
%
IDLW1 IDLW2
2
100
100
%
1 ,
2
,
2
V
U
Diff
S
BaseW
BaseW
V
U
Bias
S
BaseW
BaseW
I
I
I
I
I
I
I
I
I
Max IDLW
IDLW
Max
I
I
I
IECEQUATION205 V2 EN-US
(Equation 12)
The phase selection settings for the second instance of the T1PPDIF function shall
be:
PhSelW1
=(L1-L2)/2
PhSelW2
=L2
InvW2Curr
=Yes
Then the internal calculations will be:
2
1
2
2
1
2
100
100
%
IDLW1 IDLW2
2
100
100
%
1 ,
2
,
2
V
U
Diff
R
BaseW
BaseW
V
U
Bias
R
BaseW
BaseW
I
I
I
I
I
I
I
I
I
Max IDLW
IDLW
Max
I
I
I
IECEQUATION206 V2 EN-US
(Equation 13)
Section 6
1MRK 506 375-UEN A
Differential protection
88
Railway application RER670 2.2 IEC
Application manual
Summary of Contents for RELION RER670
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