GE 750 Instruction Manual page 380

MONITORING
7 - 52
Model Impedances (
Source
Feeder
The source voltage (ahead of the source impedance) is 14.0 kV
feature, all of which can cause a fault location calculation by tripping, set to a pickup
current below the programmed test current, can be used for the tests.
 Program the test set with the following prefault voltages and currents.
 V
= 67.8
an
∠
2.9 210°; I
 Program the test set with the following fault voltages and currents.
This fault is from Phase A to ground, placed 5.0 km from the relay.
 V
= 59.0∠0°; V
an
= 2.9∠210°; I
 Inject the prefault voltages and currents, then apply the fault.
The relay should trip and determine the type of fault (A-G), the distance
to the fault (5.0 km) and the reactance to the fault (2.73
 Program the test set with the following fault voltages and currents.
This fault is Phase B to ground, 6.0 km from the relay.
 V
= 67.4∠2°; V
an
12.0∠166°; I
 Inject the prefault voltages and currents, then apply the fault.
The relay should trip and determine the type of fault (B-G), the distance
to the fault (6.0 km) and the reactance to the fault (3.27
 Program the test set with the following fault voltages and currents.
This fault is Phase C to ground, placed 7.0 km from the relay.
 V
= 67.4∠2°; V
an
2.9∠210°; I
 Inject the prefault voltages and currents, then apply the fault.
The relay should trip and determine the type of fault (C-G), the distance
to the fault (7.0 km) and the reactance to the fault (3.82
 Program the test set with the following fault voltages and currents.
This fault is Phase A to C, 8.0 km from the relay.
 V
= 60.4∠4°; V
an
= 2.9∠210°; I
 Inject the prefault voltages and currents, then apply the fault parameters.
The relay should trip and determine the type of fault (A-C), the distance
to the fault (8.0 km) and the reactance to the fault (4.36
 Program the test with the following fault voltages and currents.
This fault is Phase A to B, placed 9.0 km from the relay.
 V
= 62.2∠358°; V
an
I = 10.3∠133°; I
b
Ω
) Z = Z
POS NEG
0.028 + j0.662
1.250 + j5.450
∠ ∠
0°; V = 67.8 240°; V = 67.8
bn cn
∠
= 2.9 90°
c
= 67.4∠241°; V
bn cn
= 2.9∠90°
c
= 60.3∠242°; V
bn cn
= 2.9∠90°
c
= 67.4∠242°; V
bn cn
= 9.9∠47°
c
= 67.4∠242°; V
bn cn
= 11.4∠73°
c
= 61.0∠244°; V
bn
= 2.9∠90°
c
750 FEEDER MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 7: COMMISSIONING
Z
ZERO
0.028 + j0.662
5.280 + j15.79
1.6°. Any overcurrent
∠
∠ ∠
120°; I = 2.9 330°; I
a
= 67.4∠121°; I = 13.0∠286°; I
a
Ω
).
= 67.4∠122°; I = 2.9∠330°; I
a
Ω
).
= 61.3∠120°; I = 2.9∠330°; I
a
Ω
).
= 61.7∠117°; I = 11.4∠253°; I
a
Ω
).
= 67.4∠122°; I = 10.3∠313°;
cn a
=
b
b
=
b
=
b
b