Placing The Relay In Service - GE 750 Instruction Manual

PLACING THE RELAY IN SERVICE

7.7.1 Description
Note
NOTE
7.7.2 On-Load
Testing
7 - 92
7.7 Placing the Relay In Service
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.
 Cycle through the relay setpoints and set each setpoint in each group to
the required value.
 Save all the relay setpoints to a file (or print them) for a final inspection
to confirm that all setpoints are correct.
 Set the relay clock (date and time) if IRIG-B is not used or unavailable.
 Clear all historical values stored in the relay.
Under subheading
USE DATA
DATA
Under subheading
TRIP COUNTER DATA
 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.
 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,
establishing that the relay is operating normally.
 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 confirm 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 energizing.
 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
AB: BC: CA:
BN: CN:
LINE A-B VOLTAGE:
S1 RELAY SETUP
,
CLEAR MAX DMND DATA
to "Yes".
S1 RELAY SETUP
and
RESET ARCING CURRENT DATA

, verify the following:
A2 METERING VOLTAGE
<Magnitude>,
AVERAGE LINE VOLTAGE:
<Magnitude>,
AVERAGE PHASE VOLTAGE:
<Phasor>,
LINE B-C VOLTAGE:
750 FEEDER MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 7: COMMISSIONING

, set
CLEAR DATA CLEAR ENERGY
, and
CLEAR EVENT RECORDER

, also set
INSTALLATION RESET
to "Yes".
<Magnitude>,
<Magnitude in kV>,
<Phasor>,
LINE C-A
AN: