Hitachi Relion 670 Series Applications Manual page 85

1MRK506375-UEN Rev. N
IBaseW 1
IECEQUATION16075 V1 EN-US
IBaseW 2
IECEQUATION16076 V1 EN-US
where:
SBase
UBase
W1
UBase
W2
The base currents for T1PPDIF functions are set under Global Base Values in Parameter Setting
tool.
6.2.5.1 Application examples
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
132/15kV
U
V
IEC15000170 V3 EN-US
Figure 34:
Base current calculation:
I
Base _ Wx
IECEQUATION058 V1 EN-US
Railway application RER670
Application manual

1000 SBase
 
121 A
UBase
W 1

1000 SBase
 
1067 A
UBase
W 2
Rated power of transformer [MVA]
Rated phase-to-phase voltage of winding 1 [kV]
Rated phase-to-phase voltage of winding 2 [kV]
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.
I
U
132kV
I
v
Transformer connection – example 1
 
1000 S MVA

 
U kV
Ph _ Ph _ Wx
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Section 6
Differential protection
(Equation 4)
(Equation 5)
GUID-BAC97BE4-C678-435E-ACEE-7C90BB276E58 v2
GUID-0C1EBB70-8FBB-4AB9-8101-6E16B265FD7D v2
R
15kV
I
s
S
IEC15000170-3-en.vsdx
(Equation 6)
79