GE 750 Instruction Manual page 232

750/760
Feeder Management Relay
SETUP
NOTE
5–136
setpoint to "Prefault". The relay replaces the normal AC inputs with those pro-
grammed on the
PREFAULT VALUES
52a and 52b contacts, are monitored normally throughout the simulation. The
relay's simulation of a circuit breaker is indicated by the status of the Breaker
Open and Breaker Closed front panel indicators.
The relay remains in the Prefault State until a command is received to enter the
Fault State, either by setting the
or a contact closure on a logic input whose function setpoint is set to Simulate
Fault. The logic input makes the measurement of feature operating times
possible when output relays are allowed to operate.
In the Fault State, relay features respond to the programmed fault values,
generating a trip, alarms, event records, triggers of trace memory and data
logger, and front panel indications as necessary. Output relays only operate if
permitted by the
ALLOW OPERATION OF RELAYS (3-7)
the Fault State until it has detected a trip condition. Note that the Trip Relay is
not allowed to operate. At this time the simulated breaker is opened (as
indicated by front panel indicators) and the relay is placed in Postfault State.
The relay remains in the Postfault State until either a close command received
or the 760 autoreclose scheme has all requirements met and is ready to close.
At this time the relay returns to the Prefault State. Note that the Close Relay is
not allowed to operate. Setting the
terminates simulation.
2. If simulation of the feeder breaker is not required set the Circuit Breaker Simu-
lation setpoint to Disabled. After the required simulation setpoints have been
entered, the relay is placed in simulation mode by setting the
setpoint to "Prefault". The relay replaces the normal AC inputs with those pro-
grammed on the Prefault Values setpoint page. All logic inputs are monitored
normally throughout the simulation 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 Method 1 above except that the Trip
Relay will operate if a trip condition is declared and the Close Relay will operate
in response to any form of close request. As well, the Simulation State is
controlled by the monitored state of the breaker.
b) Setup
PATH: SETPOINTS S8 TESTING
[ ] SIMULATION STATE:
Disabled
CIRCUIT BRKR
MESSAGE
SIMULATION: Enabled
ALLOW OPERATION OF
MESSAGE
RELAYS (3-7): -----
Program to "Disabled" if actual system inputs are to be monitored.
SIMULATION STATE
If programmed to any other value, 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 Fault Values setpoints on page 5–137.
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 automatically change to "Post-
fault".
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setpoint page. Logic inputs, except for the
setpoint to the Fault State,
SIMULATION STATE
setpoint. The relay remains in
setpoint to "Disabled" also
SIMULATION STATE
SIMULATION SETUP
Range: Disabled,
Postfault
Range: Enabled, Disabled
Range: Any combination of the 3 to 7
Auxiliary relays
S8 Testing
SIMULATION STATE
Prefault, Fault,
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