Power Metering - GE 750 Instruction Manual

750/760
Feeder Management Relay

Power Metering

7–14
(Phasor)
SYNCHRO VOLTAGE:
SYNCHRO FREQ:
SYNCHRO DELTA DF: DV: DF:
2. Inject voltage of various magnitudes and frequencies into the line voltage input
and verify the displays.
a) Real Power and Watthours
For these tests, refer to the figures on page 7–4 for test connections. The expected
accuracy is as follows:
Real Power: ±1% of full scale at currents 5 to 199% of nominal and voltages
from 50 to 130 V
Watthours: ±2% of full scale at currents 5 to 199% of nominal and voltages
from 50 to 130 V
The procedure for testing the metered real power and watthours is as follows.
1. The relevant actual values displays are located as shown below:
A2 METERING PWR 3Φ REAL PWR:
A2 METERING PWR ΦA REAL PWR:
A2 METERING PWR ΦB REAL PWR:
A2 METERING PWR ΦC REAL PWR:
A2 METERING ENERGY
A2 METERING ENERGY
2. To reduce the time required for watthour measurements, set the input VT and
CT ratios to high values. Inject 3-phase voltage and current of various values
and angles into the relay. Note that real power is measured and displayed.
3. Maintain voltage and current at various settings for a time sufficient to achieve
a minimum of 20 MWh for each test interval. Check that watthours is measured
and displayed. Note that watthours for load in the positive direction and
negative directions are stored in separate registers. The procedure should be
performed for loads in each direction.
b) Reactive Power and Varhours
For these tests, refer to the figures on page 7–4 for test connections. The expected
accuracy is as follows:
• Reactive Power: ±1% of full scale, currents 5 to 199% of nominal, voltages 50
to 130 V
• Varhours: ± 2% of full scale, currents 5 to 199% of nominal, voltages 50 to 130
V
The procedure for metered reactive power and energy is as follows:
1. The relevant actual values displays are shown below:
A2 METERING PWR 3Φ REACTIVE PWR:
A2 METERING PWR ΦA REACTIVE PWR:
A2 METERING PWR ΦB REACTIVE PWR:
A2 METERING PWR ΦC REACTIVE PWR:
A2 METERING ENERGY
A2 METERING ENERGY
2. To reduce the time required for varhour measurements, set the input VT and CT
ratios to high values. Inject 3-phase voltage and current of various values and
angles into the relay. Note that reactive power is measured and displayed.
3. Maintain voltage and current at various settings for a time sufficient to achieve
a minimum of 20 Mvarh for each test interval. Check that varhours are
measured and displayed. Note that varhours for load in the positive direction
and negative directions are stored in separate registers. The procedure should
be performed for loads in each direction.
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(not available when connected Delta)
(not available when connected Delta)
(not available when connected Delta)
POSITIVE WATTHOURS:
NEGATIVE WATTHOURS:
(not available when connected Delta)
(not available when connected Delta)
(not available when connected Delta)
POSITIVE VARHOURS:
NEGATIVE VARHOURS:
Metering
GE Multilin