Measurement Of Input Voltage - GE 750 Instruction Manual

17 COMMISSIONING
Test Connections per Figure 17–1: RELAY TEST WIRING – WYE CONNECTION or Figure 17–2: RELAY
TEST WIRING – DELTA CONNECTION on page 17–4.
a) BUS VOLTAGE
Expected Accuracy:
Phase-neutral voltages ± 0.68 V for 50 to 130 V
Phase-phase voltages ± 0.68 V for 50 to 130 V ( V
Actual Values Displays:
Under subheading
A2 METERING \ VOLTAGE \
AB: BC: CA
AVERAGE LINE VOLTAGE
AN: BN: CN:
AVERAGE PHASE VOLTAGE:
LINE A-B VOLTAGE
LINE B-C VOLTAGE
LINE C-A VOLTAGE
PHASE A-N VOLTAGE
PHASE B-N VOLTAGE
PHASE C-N VOLTAGE
POS SEQ VOLTAGE
NEG SEQ VOLTAGE
ZERO SEQ VOLTAGE
NEUTRAL (3VO) VOLTAGE
Procedure:
1. 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 mag-
nitudes 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 √3 of the line voltage
magnitude.
2. 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.
GE Power Management
Courtesy of NationalSwitchgear.com
± 2.18 V for other voltages within specified limits
± 1.36 V for 50 to 130 V (calculated V
± 2.18 V for all other voltages within the specified limits ( V
± 4.36 V for all other voltages within the specified limits (calculated V
: (Magnitude)
(Magnitude)
(Magnitude) (not available when connected Delta)
(Magnitude) (not available when connected Delta)
(Phasor)
(Phasor)
(Phasor)
(Phasor) (not available when connected Delta)
(Phasor) (not available when connected Delta)
(Phasor) (not available when connected Delta)
(Phasor)
(Phasor)
(Phasor)
(Phasor)
750/760 Feeder Management Relay

17.6.2 MEASUREMENT OF INPUT VOLTAGE

and V
)
ab cb
)
ac
17.6 METERING
and V )
ab cb
)
ac
17-
13
17