6.2.4.1
Application examples
GUID-BAC97BE4-C678-435E-ACEE-7C90BB276E58 v2
Five examples of railway power transformer connections are presented here. Other
transformer connections may also be protected using the single-phase T1PPDIF
function.
Transformer connection – example 1
GUID-0C1EBB70-8FBB-4AB9-8101-6E16B265FD7D v2
In all the following figures the phases are indicated as U and V on
the HV side and R and S on the LV side of the transformer.
Equivalent winding ends are U & R and V & S.
IEC15000170-3-en.vsdx
132/15kV
15kV
132kV
I
U
v
I
U
I
s
S
V
R
IEC15000170 V3 EN-US
Figure 32:
Transformer connection – example 1
Base current calculation:
kV
U
MVA
S
I
Wx
Ph
Ph
Wx
Base
_
_
_
1000
IECEQUATION058 V1 EN-US
(Equation 6)
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 calculation on the HV side:
0
2
U
V
I
I
I
IECEQUATION200 V2 EN-US
(Equation 7)
Removal of zero sequence current from the V phase:
1MRK 506 375-UEN A
Section 6
Differential protection
Railway application RER670 2.2 IEC
85
Application manual
Summary of Contents for RELION RER670
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