ABB distributed control system HIEE300024R4 UAA326A04 control DCS module card

Description

UAA326A04  SIMULATION FUNCTION: Select the simulation mode required. Select “Disabled” to

return the 745 to normal operation. The following table details the simulation function

modes.

– “Prefault Mode”: Select prefault mode to simulate UAA326A04  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 UAA326A04  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 S6 TESTING  SIMULATION  PREFAULT VALUES 

W1(3) PHASE ABC CURRENT MAGNITUDE. The magnitude of the voltage is set to

the value programmed in S6 TESTING  SIMULATION  PREFAULT VALUES 

VOLTAGE INPUT MAGNITUDE. The frequency is set to the value programmed in S2

SYSTEM SETUP  TRANSFORMER  NOMINAL FREQUENCY.

– “Fault Mode”: Select fault mode to simulate the faulted operating condition of a

transformer. In this mode, the normal inputs are UAA326A04 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 S6 TESTING  SIMULATION  FAULT VALUES.

A logic input, programmed to the “Simulate Fault” function, can be used to trigger the

transition UAA326A04 from the “Prefault Mode” to the “Fault Mode”, allowing the measurement of

element operating times.

– “Playback Mode”: Select playback mode 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 32 cycles of UAA326A04 waveform samples downloaded into the 745 by the

EnerVista 745 Setup software (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.

BLOCK OPERATION OF OUTPUTS: Select the output relays which must be blocked

from operating while in simulation mode. An UAA326A04 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 equipment. 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 signal has an effect only if the 745 is initially in prefault

mode.

W1(W3) PHASE A(C) CURRENT MAGNITUDE: Enter the winding 1(3) phase A(C) current

magnitude (in terms of the winding full load current) while in fault mode.

W1(3) PHASE A(C) CURRENT ANGLE: Enter the winding 1(3) phase A(C) current angle

(with respect to the winding 1 phase A current phasor) while in fault mode. Note that

the winding 1 phase A current angle cannot be edited and is used as a reference for

the other phase angles.

W1(3) GROUND CURRENT MAGNITUDE: Enter the winding 1(3) ground current

magnitude (in terms of the winding FLC) while UAA326A04 in fault mode. Note that ground refers

to the measured CT current in the connection between transformer neutral and

ground. As such, this message only appears for wye or zig-zag connected windings.

W1(3) GROUND CURRENT ANGLE: Enter the winding 1(3) ground current angle (with

respect to the winding 1 phase A current phasor). This message only appears for wye

or zig-zag connected windings.

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