Ge 489 User Manual download pdf (Page 63)

GE Multilin 489 Generator Management Relay 4-13

4 SETPOINTS 4.3 S2 SYSTEM SETUP

4.3.3 GENERATOR PARAMETERS

PATH: SETPOINTS ÖØ S2 SYSTEM SETUP ÖØ GENERATOR PARAMETERS

As a safeguard, when a unit is received from the factory, the PHASE CT PRIMARY and Generator Parameters setpoints will be

defaulted to "--------", indicating they are not programmed. The 489 indicates that it was never programmed. Once these

values are entered, the 489 will be in service. All elements associated with power quantities are programmed in per unit

values calculated from the rated MVA and power factor. The generator full load amps (FLA) is calculated as

(EQ 4.2)

All voltage protection features that require a level setpoint are programmed in per unit of the rated generator phase-phase

voltage.The nominal system frequency must be entered here. This setpoint allows the 489 to determine the internal sam-

pling rate for maximum accuracy. If the sequence of phase rotation for a given system is ACB rather than the standard

ABC, the system phase sequence setpoint may be used to accommodate this rotation. This setpoint allows the 489 to prop-

erly calculate phase reversal and negative sequence quantities.

4.3.4 SERIAL START/STOP INITIATION

PATH: SETPOINTS ÖØ S2 SYSTEM SETUP ÖØ SERIAL START/STOP

If enabled, this feature will allow the user to initiate a generator startup or shutdown via the RS232/RS485 communication

ports. Refer to the Communications chapter for command formats. When a startup command is issued, the auxiliary

relay(s) assigned for starting control will be activated for 1 second to initiate startup. When a stop command is issued, the

assigned relay(s) will be activated for 1 second to initiate a shutdown.

 GEN. PARAMETERS

 [ENTER] for more

GENERATOR RATED

MVA: ----------------

Range: 0.050 to 2000.000 MVA