GE 750 User Manual

GE Power Management 750/760 Feeder Management Relay 17-
45
17 COMMISSIONING 17.8 MONITORING
17
10. Program the test with the following fault voltages and currents.
V
an
= 62.2
∠
358°; V
bn
= 61.0
∠
244°; V
cn
= 67.4
∠
122°; I
a
= 10.3
∠
313°; I
b
= 10.3
∠
133°; I
c
= 2.9
∠
90°
This fault is phase A to B, placed 9.0 km from the relay.
11. Inject the prefault voltages and currents, then apply the fault. The relay should trip and determine the type
of fault (A-B), the distance to the fault (9.0 km) and the reactance to the fault (4.91
Ω
).
12. Program the test with the following fault voltages and currents.
V
an
= 60.3
∠
0°; V
bn
= 60.3
∠
240°; V
cn
= 60.3
∠
120°; I
a
= 10.8
∠
283°; I
b
= 10.8
∠
163°; I
c
= 10.8
∠
43°
This fault is phase A to B to C, placed 10.0 km from the relay.
13. Inject the prefault voltages and currents, then apply the fault. The relay should trip and determine the type
of fault (A-B-C), the distance to the fault (10.0 km) and the reactance to the fault (5.45
Ω
).
17.8.4 CURRENT DEMAND
Test Connections per Figure 17–1: RELAY TEST WIRING – WYE CONNECTION or Figure 17–2: RELAY
TEST WIRING – DELTA CONNECTION on page 17–4.
1. Clear demand data registers before starting this test.
2. Inject a fixed value of current. Monitor the actual value of the measured demand, and note the level at
which the feature generates an output. Turn the current off.
Indications and Operations caused by the various Functions are as outlined under Phase Time O/C,
with the following exception:
There is no Trip function for this element.
17.8.5 REAL POWER DEMAND
Test Connections per Figure 17–1: RELAY TEST WIRING – WYE CONNECTION or Figure 17–2: RELAY
TEST WIRING – DELTA CONNECTION on page 17–4.
1. Clear demand data registers before starting this test.
2. Inject a fixed value of watts. Monitor the actual value of the measured demand, and note the level at which
the feature generates an output. Turn the current off.
Indications and Operations caused by the various Functions are as outlined under Phase Time O/C,
with the following exception:
There is no Trip function for this element.
17.8.6 REACTIVE POWER DEMAND
Test Connections per Figure 17–1: RELAY TEST WIRING – WYE CONNECTION or Figure 17–2: RELAY
TEST WIRING – DELTA CONNECTION on page 17–4.
1. Clear demand data registers before starting this test.
2. Inject a fixed value of vars. Monitor the actual value of the measured demand, and note the level at which
the feature generates an output. Turn the current off.
Indications and Operations caused by the various Functions are as outlined under Phase Time O/C,
with the following exception.
There is no Trip function for this element.

GE 750 Specifications

General

Brand	GE
Model	750
Category	Relays
Language	English