GE Feeder Management Relay 750 User Manual

GE Multilin 750/760 Feeder Management Relay 8-11
8 COMMISSIONING TESTS 8.3 METERING
8
The procedure for testing the metered bus voltage is as follows:
1. The relevant actual values displays are located under subheading
A2 METERING ÖØ VOLTAGE and are:
AB: BC: CA: (Magnitude)
AVERAGE LINE VOLTAGE: (Magnitude)
AN: BN: CN: (Magnitude) (not available when connected Delta)
AVERAGE PHASE VOLTAGE: (Magnitude) (not available when connected Delta)
LINE A-B VOLTAGE: (Phasor)
LINE B-C VOLTAGE: (Phasor)
LINE C-A VOLTAGE: (Phasor)
PHASE A-N VOLTAGE: (Phasor) (not available when connected Delta)
PHASE B-N VOLTAGE: (Phasor) (not available when connected Delta)
PHASE C-N VOLTAGE: (Phasor) (not available when connected Delta)
POS SEQ VOLTAGE: (Phasor)
NEG SEQ VOLTAGE: (Phasor)
ZERO SEQ VOLTAGE: (Phasor)
NEUTRAL (3VO) VOLTAGE: (Phasor)
2. Inject 1-phase voltage of various values into the relay bus voltage input one phase at a time, and observe the magni-
tude. Note that for Wye VTs the positive sequence, negative sequence and zero sequence magnitudes are 1/3 of the
phase voltage magnitude for this test. For Delta VTs the zero sequence voltage will be displayed as 0. The positive
sequence and negative sequence magnitudes will be of the line voltage magnitude.
3. Inject 3-phase voltage of various values and angles into the relay bus voltage input and note the measured voltage
phasors & symmetrical components. For Delta VTs the zero sequence voltage will be shown as 0.
b) BUS VOLTAGE FREQUENCY
For these tests, refer to the figures on page 8–3 for test connections. The expected accuracy is as follows:
Frequency: ±0.02 Hz of injected value within the range 16.00 to 90.00 Hz
Undervoltage Inhibit: 10 V secondary
The procedure for testing the metered bus voltage frequency is as follows:
1. The relevant actual values display is located as follows: A2 METERING ÖØ FREQ ÖØ SYSTEM FREQ.
2. Inject a voltage of nominal value at nominal frequency into Phase A. Check that the frequency is measured and dis-
played.
3. Check the undervoltage inhibit level by slowly reducing the voltage until the frequency is no longer measured, and
"0.00 Hz" is displayed.
4. Return the voltage to nominal. Adjust the frequency above and below nominal, and note the frequency measured by
the relay.
The procedure for testing the metered frequency decay rate is as follows:
1. The relevant actual values display is located as follows:
A2 METERING ÖØ FREQ ÖØ FREQ DECAY RATE
2. Vary the frequency of the phase A voltage and verify the measured frequency decay rate.
c) SYNCHRO VOLTAGE AND FREQUENCY
For these tests, refer to the figures on page 8–3 for test connections. The expected accuracy is as follows:
Voltage: ±0.68 V for 50 to 130 V
Frequency: ±0.02 Hz of injected value within the range 16.00 to 90.00 Hz
The procedure for testing the metered synchro voltage and frequency is as follows:
1. The relevant actual values displays are located under subheading A2 METERING ÖØ SYNCHRO VOLTAGE and are:
SYNCHRO VOLTAGE: (Phasor)
SYNCHRO FREQ:
SYNCHRO DELTA ΔF: ΔV: ΔF:
2. Inject voltage of various magnitudes and frequencies into the line voltage input and verify the displays.
3
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GE Feeder Management Relay 750 Specifications

General

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