GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual page 145

5 SETPOINTS
a) SIMULATION SETUP
PATH: SETPOINTS S6 TESTING
SIMULATION SETUP
[ENTER] for more
The simulation feature allows testing of the functionality of the relay in response to programmed conditions, without the
need of external AC voltage and current inputs. System parameters such as currents and voltages, phase angles and sys-
tem frequency are entered as setpoints. When placed in simulation mode, the relay suspends reading actual AC inputs and
generates samples to represent the programmed phasors. These samples are used in all calculations and protection logic.
Enabling this feature will turn off the In Service LED, turn on the Test Mode LED, and de-energize the self-test relay.
WHEN IN SIMULATION MODE, PROTECTION FEATURES DO NOT OPERATE BASED ON ACTUAL SYSTEM
INPUTS. IF SIMULATION MODE IS USED FOR FIELD TESTING ON EQUIPMENT, OTHER MEANS OF PRO-
TECTION MUST BE PROVIDED BY THE OPERATOR.
CAUTION
• SIMULATION FUNCTION: Select the simulation mode required. Select Disabled to return the 745 to normal operation.
The following table details the simulation function modes.
MODE
Prefault Mode
Fault Mode
Playback Mode
• BLOCK OPERATION OF OUTPUTS: Select the output relays which must be blocked from operating while in simula-
tion mode. An operator can use the simulation feature to provide a complete functional test of the protection features,
except for the measurement of external input values. As this feature may be used for on site testing, provision is made
(with this setpoint) to block the operation of output relays during this testing, to prevent the operation of other equip-
ment. Note that the default setting blocks the operation of all output relays.
• START FAULT MODE SIGNAL: Select any logic input which, when asserted, initiates Fault Mode simulation. This sig-
nal has an effect only if the 745 is initially in Prefault Mode.
• START PLAYBACK MODE SIGNAL: Select any logic input which, when asserted, initiates Playback Mode simulation.
This signal has an effect only if the 745 is initially in Prefault Mode.
GE Multilin
Courtesy of NationalSwitchgear.com
SIMULATION SIMULATION SETUP
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SIMULATION FUNCTION:
ENTER
Disabled
ESCAPE
BLOCK OPERATION OF
ESCAPE
OUTPUTS: 12345678
MESSAGE
START FAULT MODE
ESCAPE
SIGNAL: Disabled
MESSAGE
START PLAYBACK MODE
ESCAPE
SIGNAL: Disabled
MESSAGE
DESCRIPTION
Prefault Mode
Select to simulate the normal operating condition of a transformer. In this mode, the normal
inputs are replaced with sample values generated based on the programmed prefault values. Phase
currents are balanced (i.e. equal in magnitude and 120° apart), and the phase lag between windings is that
which would result under normal conditions for the transformer type selected. The magnitude of phase
currents for each winding are set to the values programmed in
VALUES W1(3) PHASE ABC CURRENT MAGNITUDE
programmed in
S6 TESTING SIMULATION
frequency is set to the value programmed in
Select "Fault Mode" to simulate the faulted operating condition of a transformer. In this mode, the normal
inputs are replaced with sample values generated based on the programmed fault values. The magnitude
and angle of each phase current and ground current of the available windings, the magnitude and angle of
the voltage input, and system frequency are set to the values programmed under
.
SIMULATION FAULT VALUES
A logic input, programmed to the "Simulate Fault" function, can be used to trigger the transition from the
"Prefault Mode" to the "Fault Mode", allowing the measurement of element operating times.
Playback Mode
Select to play back a sampled waveform data file which has been pre-loaded into the
relay. In this mode, the normal inputs are replaced with 16-cycles of waveform samples downloaded into the
745 by the 745PC program (from an oscillography data file in the IEEE Comtrade file format).
A logic input, programmed to the "Simulate Playback" function, can be used to trigger the transition from the
"Prefault Mode" to the "Playback Mode", allowing the measurement of element operating times.
745 Transformer Management Relay
Range: Disabled, Prefault Mode, Fault Mode
Playback Mode
Range: Any combination of outputs 1 to 8
Range: Disabled, Logc Inpt 1 to 16
Range: Disabled, Logc Inpt 1 to 16
S6 TESTING
. The magnitude of the voltage is set to the value
PREFAULT VALUES VOLTAGE INPUT MAGNITUDE
S2 SYSTEM SETUP TRANSFORMER
5.8 S6 TESTING
5.8.4 SIMULATION
SIMULATION PREFAULT
. The
.
NOMINAL FREQUENCY
S6 TESTING
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