GE P645

B
175/175 /30 MVA
230/115 /13.8 kV
YNynd1
Phase & amplitude
Correction
+
Zero sequence filtering
BB
D
BB
D
BB
D
Phase & amplitude
Correction
+
Zero sequence filtering
A
C
Protected
zone
a
b
c
P643
V03117
Phase & amplitude
Correction
+
Zero sequence filtering
B
B
B
+5% / -15%
19 taps
1200 :5
1200 :5
HV
LV
1200 :5
Figure 54: P643 used to protect an autotransformer with unloaded delta winding
Set the following parameter
s in the SYSTEM CONFIG column:
Setting in GROUP 1 SYSTEM CONFIG Value
Winding Config HV+LV+TV
Winding Type Auto
HV CT Terminals 001
LV CT Terminals 100
TV CT Terminals 010
Ref Power S 175.00 MVA
Ref Vector Group 0
HV Connection Y-Wye
HV Grounding Ungrounded
HV Nominal 230.0 kV
HV Rating 175.00 MVA
% Reactance 10.00%
LV Vector Group 0
LV Connection Y-Wye
LV Grounding Ungrounded
LV Nominal 230.00 kV
LV rating 175.00 MVA
Chapter 6 - Transformer Differential Protection P64x
128 P64x-TM-EN-1.3