GE 750 Instruction Manual page 267

Metering
GE Multilin
1. The relevant actual values displays are located under subheading
and are:
VOLTAGE
(Magnitude)
AB: BC: CA:
(Magnitude)
AVERAGE LINE VOLTAGE:
(Magnitude) (not available when connected Delta)
AN: BN: CN:
AVERAGE PHASE VOLTAGE:
(Phasor)
LINE A-B VOLTAGE:
(Phasor)
LINE B-C VOLTAGE:
(Phasor)
LINE C-A VOLTAGE:
(Phasor) (not available when connected Delta)
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)
POS SEQ VOLTAGE:
(Phasor)
NEG SEQ VOLTAGE:
(Phasor)
ZERO SEQ VOLTAGE:
NEUTRAL (3VO) VOLTAGE:
2. Inject 1-phase voltage of various values into the relay bus voltage input one
phase at a time, and observe the magnitude. 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
3
magnitudes will be
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 7–4 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:
.
SYSTEM FREQ
2. Inject a voltage of nominal value at nominal frequency into Phase A. Check that
the frequency is measured and displayed.
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:
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 7–4 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
and are:
SYNCHRO VOLTAGE
http://www.GEmultilin.com
(Magnitude) (not available when connected Delta)
(Phasor)
of the line voltage magnitude.
750/760
Feeder Management Relay
A2 METERING
A2 METERING FREQ
A2 METERING FREQ
A2 METERING
7–13