Actual Values; Setpoints; Commands - GE 735 Instruction Manual

3.5 SETUP PROGRAM 3 SETUP AND OPERATION

3.5.6 ACTUAL VALUES

ACTUAL VALUES > METERED DATA:
Actual phase A B C and ground current being measured by the relay are displayed. If the relay is in simulation mode, the
displayed current will be the programmed simulation current.
ACTUAL VALUES > PRE-TRIP DATA:
After the relay trips, all currents and cause of trip are saved by the relay. This screen shows the information present at time
of trip and the cause of trip. Normally this pre-trip information is used when the relay is connected in a communication net-
work to diagnose the fault that caused the trip. When used with the 735SETUP program it confirms how the relay will oper-
ate and appear under simulated fault conditions which is useful for training and product understanding.
ACTUAL VALUES > RELAY SETTINGS:
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Actual dial and option switch settings on the relay are displayed on the screen. This is useful for verification prior to installa-
tion that intended settings have in fact been set correctly. Use the File > Relay To File menu selection to save these
displayed settings to a file for future reference.

3.5.7 SETPOINTS

SETPOINTS > SIMULATED DIALS:
When doing simulations, protection settings can be either the actual relay dials on the front panel or simulated settings from
the computer. If simulated settings are to be used, enter them using this menu selection.
SETPOINTS > /SIMULATED CURRENTS:
If a current injection set is available, actual currents can be injected into the relay via its rear terminals for testing. Fault sim-
ulations can also be simulated using only a computer by entering required currents with this menu.
SETPOINTS > CUSTOM SCHEME:
Custom scheme setpoints can be selected on the screen. This allows the relay to be configured using one of three curve
types, Aux relay assignment and block instantaneous. Switch 8 on the side of the relay must be ON for the setpoints to be
used.

3.5.8 COMMANDS

COMMANDS > RESET:
Clear the trip target indicators on the front of the relay if any are set by executing this command. It has the same effect as
pressing the CLEAR key on the front of the relay.
COMMANDS > CLEAR TRIP RECORD:
Clear the trip record stored in the pre-trip data page of the relay to none.
COMMANDS > ENABLE TRIP RELAYS:
Whenever the relay trips during testing the output trip relays will activate. This is the normal default when TEST switch 8 is
first turned on. Use this mode for activating a test set timer to verify actual operation of the relay.
COMMANDS > /DISABLE TRIP RELAYS:
If testing is to be done in a situation where the trip relay outputs would shut down equipment, the trip relays can be disabled
to prevent this. Select this mode of operation before injecting currents or issuing the "Simulate Currents" command. If the
output relays are disabled, no protection is provided to the switchgear. Returning the TEST switch 8 to the off position after
issuing this command re-enables all trip relays and full protection is restored.
COMMANDS > /USE DIAL SETTINGS:
Select this item if the desired protection settings for the simulation are to be from the relay front panel dials. The relay front
panel TEST switch 8 must be on for simulation mode to work.
3-14 735/737 Feeder Protection Relay GE Power Management