Hitachi Relion 670 Series Applications Manual page 86

Section 6
Differential protection
The HV currents I
side towards the T1PPDIF function. The LV current I
winding 2 side towards the T1PPDIF function.
Zero sequence current calculation on the HV side:

I I
U V
IECEQUATION200 V2 EN-US
Removal of zero sequence current from the V phase:
 
I I
V 0
IECEQUATION201 V2 EN-US
The phase selection settings for the T1PPDIF function shall be:
PhSelW1=(L1-L2)/2
PhSelW2=L1
InvW2Curr=No
Calculation of differential and bias currents:
 
I %
Diff
 
I %
Bias
IECEQUATION202 V2 EN-US
Transformer connection – example 2
66/15kV
U
V
IEC15000171 V3 EN-US
Figure 35:
The HV currents I
side towards the T1PPDIF function. The LV current I
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:
80
and I shall be connected as IL1 and IL2 currents, respectively, for the winding 1
V U

2 I
0
   
 
I I I I
U V V U
 
I
V
2 2
100
  
IDLW 1 IDLW 2
I
BaseW 1
 
 
IDLW 1 , IDLW 2 Max
I
U
66kV
I
v
Transformer connection – example 2
and I shall be connected as IL1 and IL2 currents, respectively, for the winding 1
V U
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shall be connected as IL1 current for the
s

I I 100
 V U  
I
S
2 I
BaseW 2

 
100 I I 100
 
V U
,

I 2 I


BaseW 1 BaseW 2
shall be connected as IL1 current for the
s
1MRK506375-UEN Rev. N


I

S


GUID-2247CE83-7174-4CE2-B8F1-51494C8F73A5 v2
15kV
I
s
IEC15000171-3-en.vsdx
Railway application RER670
(Equation 7)
(Equation 8)
(Equation 9)
R
S
Application manual