GE Feeder Management Relay 750 User Manual

8-56 750/760 Feeder Management Relay GE Multilin
8.7 PLACING THE RELAY IN SERVICE 8 COMMISSIONING TESTS
8
8.7PLACING THE RELAY IN SERVICE 8.7.1 DESCRIPTION
The procedure outlined in this section is explicitly confined to the operation of the relay, and does not
include the operation of any equipment external to the relay.
1. Cycle through the relay setpoints and set each setpoint in each group to the required value.
2. Save all the relay setpoints to a file (or print them) for a final inspection to confirm that all setpoints are correct.
3. Set the relay clock (date and time) if IRIG-B is not used or unavailable.
4. Clear all historical values stored in the relay. Under subheading
S1 RELAY SETUP ÖØ CLEAR DATA, set CLEAR ENERGY
USE DATA, CLEAR MAX DMND DATA, and CLEAR EVENT RECORDER DATA to “Yes”. Under subheading S1 RELAY SETUP ÖØ
INSTALLATION, also set RESET TRIP COUNTER DATA and RESET ARCING CURRENT DATA to “Yes”.
5. Turn off all test voltages, and the power supply to the relay. Remove all test wiring connections, and restore to normal
any panel wiring disturbed for testing.
6. Perform a complete visual inspection to confirm that the relay is ready to be placed in service. Energize the relay
power supply circuit and check that the Relay In Service LED is on, and that the Self-Test Warning LED is off, estab-
lishing that the relay is operating normally.
7. For complete on-load checking of the relay, it is required to supply load current to the relay in a known direction of
power flow, with a known approximate value of power factor. The load current should be high enough to be certain that
the main CTs are connected correctly. The power system should be arranged to fulfill these conditions before the
feeder to which the relay is connected is energized. Advise operators of the possibility of a trip on initial energization.
8.7.2 ON-LOAD TESTING
1. If possible, before closing the feeder breaker to supply load, energize the VT circuit to which the relay is connected.
Check that all relay measurements are as expected. Under
A2 METERING ÖØ VOLTAGE, verify the following:
AB: BC: CA: <Magnitude>, AVERAGE LINE VOLTAGE: <Magnitude>, AN: BN: CN: <Magnitude>, AVERAGE PHASE VOLT-
AGE: <Magnitude in kV>, LINE A-B VOLTAGE: <Phasor>, LINE B-C VOLTAGE: <Phasor>, LINE C-A VOLTAGE: <Pha-
sor>, PHASE A-N VOLTAGE: <Phasor>, PHASE B-N VOLTAGE: <Phasor>, PHASE C-N VOLTAGE: <Phasor>, POS SEQ
VOLTAGE: <Phasor>, NEG SEQ VOLTAGE: <Phasor>, and ZERO SEQ VOLTAGE: <Phasor>
2. To have an immediate indication upon closing of the load level and whether some overcurrent protection is operating,
before closing the feeder breaker display the A2 METERING Ö CURRENT ÖØ % OF LOAD-TO-TRIP actual value.
3. After the feeder circuit breaker is closed and the feeder is carrying load current, check that all relay measurements are
as expected. Under subheading A2 METERING Ö CURRENT, verify the following actual values:
A: B: C: <Magnitude>, AVERAGE CURRENT: <Magnitude>, PHASE A(C) CURRENT: <Phasor>, NEUTRAL CURRENT:
<Phasor>, GND CURRENT: <Phasor>, SENSTV GND CURRENT: <Phasor>, POS SEQ CURRENT: <Phasor>, NEG SEQ
CURRENT:
<Phasor>, and ZERO SEQ CURRENT: <Phasor>
4. Under subheading
A2 METERING ÖØ PWR, verify that REAL PWR, REACTIVE PWR, APPARENT PWR, and PWR FACTOR val-
ues (for single and three-phase values) are as expected.
5. Verify the A2 METERING ÖØ FREQ Ö SYSTEM FREQ actual value is as expected.
6. It is very important to confirm that the input CTs are connected properly to provide correct directional control and
metering calculations. A first check of this connection is to note that the values of watts and vars as calculated by the
relay have the correct sign. This is done by comparing the relay measurements, which are signed by the conventions
shown in Figure 6–3: Power Quantity Relationships on page 6–8, to the known feeder load characteristics.
7. After some time has passed, dependent on feeder load and demand time interval settings, check the following mea-
sured values: Under
A2 METERING ÖØ ENERGY, verify the POSITIVE WATTHOURS, POSITIVE WATTHOUR COST, NEGATIVE
WATTHOURS
, NEGATIVE WATTHOUR COST, POSITIVE VARHOURS, and NEGATIVE VARHOURS values.
8. Under subheading
A2 METERING ÖØ DMND Ö PHASE A(C) CURRENT, verify the LAST PHASE A(C) CURRENT DMND and MAX
PHASE A CURRENT DMND values.
9. Under subheading
A2 METERING ÖØ DMND ÖØ REAL PWR, verify the LAST REAL PWR DMND and MAX REAL PWR DMND
values.
NOTE
Courtesy of NationalSwitchgear.com

GE Feeder Management Relay 750 Specifications

General

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