GE Feeder Management Relay 750 User Manual

8-12 750/760 Feeder Management Relay GE Multilin
8.3 METERING 8 COMMISSIONING TESTS
8
8.3.3 POWER 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 ÖØ PWR ÖØ 3Φ REAL PWR:
A2 METERING ÖØ PWR ÖØ ΦA REAL PWR: (not available when connected Delta)
A2 METERING ÖØ PWR ÖØ ΦB REAL PWR: (not available when connected Delta)
A2 METERING ÖØ PWR ÖØ ΦC REAL PWR: (not available when connected Delta)
A2 METERING ÖØ ENERGY ÖØ POSITIVE WATTHOURS:
A2 METERING ÖØ ENERGY ÖØ NEGATIVE WATTHOURS:
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 ÖØ PWR ÖØ 3Φ REACTIVE PWR:
A2 METERING ÖØ PWR ÖØ ΦA REACTIVE PWR: (not available when connected Delta)
A2 METERING ÖØ PWR ÖØ ΦB REACTIVE PWR: (not available when connected Delta)
A2 METERING ÖØ PWR ÖØ ΦC REACTIVE PWR: (not available when connected Delta)
A2 METERING ÖØ ENERGY ÖØ POSITIVE VARHOURS:
A2 METERING ÖØ ENERGY ÖØ NEGATIVE VARHOURS:
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.
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 ÖØ PWR ÖØ 3Φ APPARENT PWR:
A2 METERING
ÖØ PWR ÖØ ΦA APPARENT PWR: (not available when connected Delta)
A2 METERING ÖØ PWR ÖØ ΦB APPARENT PWR: (not available when connected Delta)
A2 METERING ÖØ PWR ÖØ ΦC APPARENT PWR: (not available when connected Delta)
2. Inject 3-phase voltage and current of various values and angles into the relay. Note that reactive power is measured
and displayed.
Courtesy of NationalSwitchgear.com

GE Feeder Management Relay 750 Specifications

General

Brand	GE
Model	Feeder Management Relay 750
Category	Protection Device
Language	English