Setpoints - GE 750 Instruction Manual

CHAPTER 5: SETPOINTS
5.9.4 Simulation

SIMULATION
750 FEEDER MANAGEMENT RELAY – INSTRUCTION MANUAL
The relay provides the ability to override the normal function of analog outputs, forcing
each to any level from 0 to 100% of the output range. Enter the percentage of the DC mA
output range to be signaled by the Analog Output 1 (2 to 8) for the
For example, if the relay has been ordered with 4 to 20 mA analog outputs, setting this
value to "100%" will output 20 mA, "0%" will output 4 mA, and "50%" will output 12 mA.
The Always defaults to "Disabled" on power-up
FORCE A/O FUNCTION
Main Menu

PATH: SETPOINTS S8 TESTING
[]
MESSAGE
MESSAGE
MESSAGE
When in Simulation Mode, the normal protection and control features are not
operational. This is indicated by the 8 Self-Test Warning relay being de-energized. If
Simulation Mode is used for field testing on equipment, the operator must provide
other means of protection and control.
A simulation feature is provided for testing the functionality of the relay in response to
program conditions, without the need of external AC voltage and current inputs. First time
users will find this to be a valuable training tool. System parameters such as currents and
voltages, phase angles, and system frequency are entered as setpoints. When placed in
simulation mode, the relay suspends reading actual AC inputs, generates samples to
represent the programmed phasors, and loads these samples into the memory to be
processed by the relay. Both normal and fault conditions can be simulated to exercise a
variety of relay features. There are three sets of input parameters used during simulation,
each providing a particular state of the system, as shown below:
• Prefault State: This state simulates the normal operating condition of a feeder
carrying load current, by replacing the normal input parameters with programmed
prefault values. Voltages are automatically set to the nominal value programmed in
the
BUS VT NOMINAL SECONDARY VOLTAGE
Phase currents are balanced and set to the value programmed in the
setpoint. The phase angle of each phase current relative to its
A/B/C CURRENT
corresponding phase neutral voltage is set to the value programmed in the
setpoint. The frequency of voltages and currents are
PWR FACTOR ANGLE
automatically set to the values programmed in the
• Fault State: This state simulates the faulted operating condition of a feeder by
replacing the normal prefault feeder input parameters with programmed fault values.
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SIMULATION

SETUP

PREFAULT
VALUES

FAULT []
VALUES

POST FAULT
VALUES
setpoint. The neutral current is set to zero.
NOMINAL FREQ
S8 TESTING

setpoints.

FORCE A/O 1(8)
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See page 5–173
[]
See page 5–174
See page 5–174
[]
See page 5–175
PREFAULT PHASE
PREFAULT
setpoint.
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