GE 750 Instruction Manual page 304

15.4 SIMULATION
The relay remains in the Postfault State until either a close command is sent to the relay, or the 760 autore-
close scheme has all requirements met and is ready to close. At this time the relay returns to the Prefault
State . Note that the 2 CLOSE relay is not allowed to operate. Setting the
abled also terminates simulation.
2. If simulation of the feeder breaker is not required set the
After the required simulation setpoints have been entered, the relay is placed in simulation mode by setting
the
SIMULATION STATE
on the
PREFAULT VALUES
including any set to monitor the 52a/52b contacts by which the front panel Breaker Open and Breaker
Closed indicators are set.
Operation is similar to that described in (1) above except that the 1 TRIP relay will operate if a trip condition
is declared and the 2 CLOSE relay will operate in response to any form of close request. As well, the Sim-
ulation State is controlled by the monitored state of the breaker.
SETUP
[ENTER] for more
SIMULATION STATE:
Disabled
15
CIRCUIT BREAKER
SIMULATION: Enabled
ALLOW OPERATION OF
RELAYS (3-7): -----
15-
6
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setpoint to Prefault . The relay replaces the normal AC inputs with those programmed
setpoint page. All logic inputs are monitored normally throughout the simulation
The
SIMULATION SETUP
\ SETPOINTS \ S8 TESTING \ SIMULATION \ SETUP
Range: Disabled, Prefault, Fault, Postfault
This setpoint must be programmed to Disabled if actual system inputs are to
be monitored. If programmed to any other setting, the relay is in simulation
mode and actual system parameters are not monitored.
The system parameters simulated by the relay will be those in the section
below that corresponds to the programmed value of this setpoint. For example,
if programmed to Fault , then the system parameters will be set to those
defined by the setpoints in Section 15.4.4 FAULT VALUES on page 15–7.
Note: The simulation state may change due to a change in the operational
state of the relay. For example, if set to Fault and a trip opens the breaker
(either simulated or actual), the simulation state and this setpoint will automati-
cally change to Postfault .
Range: Enabled, Disabled
An operator can use the simulation feature to provide a complete functional
test of the relay's protection features, except for the measurement of external
input values. As this feature may be used for on-site testing, provision is made
to block the operation of the output relays so the operation of other equipment
is prevented. Enter Enabled to block the 1 TRIP and 2 CLOSE relays from
operating, and ignore the 52a/52b auxiliary contacts, even if installed. In this
mode, the circuit breaker will be simulated. Enter Disabled to allow the 1 TRIP
and 2 CLOSE relays to open and close an actual circuit breaker connected to
the relay. In this mode, the 52a/52b auxiliary contacts, if installed, will be read
for feedback from the breaker.
Range: Any Combination of the 3-7 AUXILIARY Relays
Relays 1 TRIP and 2 CLOSE are allowed to operate by entering Disabled for
CIRCUIT BREAKER SIMULATION
operate if selected by this setpoint. The 8 SELF-TEST WARNING relay is
always allowed to operate. Note that the default setting blocks the operation of
all output relays. For timing tests, a selected output relay can be set to be
operational, to provide a signal to stop a timer.
750/760 Feeder Management Relay
SIMULATION STATE
CIRCUIT BREAKER SIMULATION
setpoints path is:
. Relays 3-7 AUXILIARY can also be allowed to
15 S8 TESTING
setpoint to Dis-
setpoint to Disabled .
15.4.2 SETUP
GE Power Management