Figure 58: Shunt Reactor Single Line Diagram - GE P642 Technical Manual

Chapter 6 - Transformer Differential Protection
Busbar A
V03121

Figure 58: Shunt Reactor single line diagram

The bias differential element in the P643 would be used to protect the reactor. In a reactor application the low set
differential element Is1, should be set between 10%-15%. Inrush current in a shunt reactor does not appear as a
differential current like that which appears in a transformer, unless the CT saturates after some time due to long
DC time constant. Though the level of second harmonic in many cases can be relatively high there are many cases
with no or very low content of harmonics. Since the level of 2nd harmonic is small in shunt reactors compared with
transformers, the second harmonic blocking can be set as low as 10% to enhance stability during energization.
The high set 1 differential element, Is-HS1, can be set to 250% of the reactor current at rated voltage.
Set the following parameters in the SYSTEM CONFIG column:
Setting in GROUP 1 SYSTEM CONFIG
Winding Config
Winding Type
HV CT Terminals
LV CT Terminals
Ref Power S
Ref Vector Group
HV Connection
HV Grounding
HV Nominal
HV Rating
% Reactance
LV Vector Group
LV Connection
LV Grounding
LV Nominal
LV rating
Phase Sequence
VT Reversal
CT1 Reversal
CT2 Reversal
CT3 Reversal
134
T1 CT
400 :5
Bk 1
T3 CT
1000 :1
T2 CT
400:5
Bk 2 Bk 3
500 kV
163 .3 MVA
HV+LV
Conventional
011
100
163.3 MVA
0
Y-Wye
Ungrounded
500.0 kV
163.3 MVA
40.00%
0
Y-Wye
Ungrounded
115.0 kV
163.3 MVA
Standard ABC
No Swap
No Swap
No Swap
No Swap
Busbar B
Value
P64x-TM-EN-1.3
P64x