GE P645 User Manual

Setting in GROUP 1 SYSTEM CONFIG Value
HV Connection Y-Wye
HV Grounding Grounded
HV Nominal 218.50 kV
HV Rating 175.00 MVA
% Reactance 10.00%
LV Vector Group 0
LV Connection Y-Wye
LV Grounding Grounded
LV Nominal 115.00 kV
LV rating 145.00 MVA
TV Vector Group 1
TV Connection D-Delta
TV Grounding Grounded
TV Nominal 13.800 kV
TV rating 30.00 MVA
Phase Sequence Standard ABC
VT Reversal No Swap
CT1 Reversal No Swap
CT2 Reversal No Swap
Vector correction and zero sequence filtering are automatically performed by virtue of the LV Vector Group setting
and the HV Gr
ounding and LV Grounding settings.
The device calculates the ratio correction factors as follows:
K
I
S
V
amp T CT
nom T CT
ref
nom HV
,
,
,
.
.
1
1
6
3
3
800
175 10
3 218 5 10
1 73= =
×
× ×
= 00
3
1200
175 10
3 115 10
1 3
5
5
6
3
K
I
S
V
amp T CT
nom T CT
ref
nom LV
,
,
,
.= =
×
× ×
= 666
3
2000
175 10
3 13 8 10
0
3
3
6
3
K
I
S
V
amp T CT
nom T CT
ref
nom TV
,
,
,
.
= =
×
× ×
= ..273
where:
● Sref = common reference power for all ends
● K
amp, T1CT, T2CT, T3CT
= ratio correction factor of T1 CT, T2 CT, or T3 windings
I
nom, T1CT, T2CT, T3CT
= primary nominal currents of the main current transformers
● V
nom, HV, LV, TV
= primary nominal voltage of HV, LV, or TV windings
Chapter 6 - Transformer Differential Protection P64x
126 P64x-TM-EN-1.3

GE P645 Specifications

General

Brand	GE
Model	P645
Category	Relays
Language	English