Power Metering - GE Feeder Management Relay 750 Instruction Manual

8.3 METERING
a) REAL POWER AND WATTHOURS
For these tests, refer to the figures on page 8–3 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
A2 METERING
A2 METERING
A2 METERING
A2 METERING
A2 METERING
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 8–3 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
A2 METERING
A2 METERING
A2 METERING
A2 METERING
A2 METERING
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
8 negative directions are stored in separate registers. The procedure should be performed for loads in each direction.
c) APPARENT POWER
For these tests, refer to the figures on page 8–3 for test connections. The expected accuracy is as follows:
Apparent Power: ±1% of full scale, currents 5 to 199% of nominal, voltages 50 to 130 V
The procedure for metered apparent power is as follows:
1. The relevant actual values displays are shown below:
A2 METERING
A2 METERING
A2 METERING
A2 METERING
2. Inject 3-phase voltage and current of various values and angles into the relay. Note that reactive power is measured
and displayed.
8-12
Courtesy of NationalSwitchgear.com
PWR 3Φ REAL PWR:
(not available when connected Delta)
ΦA REAL PWR:
PWR
(not available when connected Delta)
ΦB REAL PWR:
PWR
(not available when connected Delta)
PWR ΦC REAL PWR:
ENERGY POSITIVE WATTHOURS:
ENERGY NEGATIVE WATTHOURS:
PWR 3Φ REACTIVE PWR:
(not available when connected Delta)
PWR ΦA REACTIVE PWR:
(not available when connected Delta)
PWR ΦB REACTIVE PWR:
(not available when connected Delta)
ΦC REACTIVE PWR:
PWR
ENERGY POSITIVE VARHOURS:
ENERGY NEGATIVE VARHOURS:
PWR 3Φ APPARENT PWR:
(not available when connected Delta)
ΦA APPARENT PWR:
PWR
(not available when connected Delta)
ΦB APPARENT PWR:
PWR
(not available when connected Delta)
ΦC APPARENT PWR:
PWR
750/760 Feeder Management Relay
8 COMMISSIONING TESTS

8.3.3 POWER METERING

GE Multilin