5-78 F650 Digital Bay Controller GE Multilin
5.5 CONTROL ELEMENTS 5 SETPOINTS
5
5.5.2 UNDERFREQUENCY UNIT (81U)
Setpoint >Control Elements > Underfrequency
The 81U unit is an underfrequency control element. The pickup setpoint can be selected from 20.00 to 65.00 Hz, allowing
its use as load shedding unit. The unit reset time delayed is selectable between 0.00 and 900 seconds, and for the unit to
operate it is necessary that the voltage value is over the value set for minimum voltage threshold. This way undesired trips
are prevented when the signal for metering the frequency is not available or has a very low value.
Table 5–69: 81U UNIT SETPOINTS
The snapshot event setpoint enables or disables the snapshot event generation for this unit.
Frequency elements operate with the system frequency, this frequency is measured in the voltage channel set for the
frequency reference, in the Frequency Reference setpoint inside Setpoint > System Setup >General setpoints.
5.5.3 OVERFREQUENCY UNIT (81O)
Setpoint >Control Elements > Overfrequency
The 81O unit is an overfrequency protection element. The pickup setpoint can be selected from 20.00 to 65.00 Hz, with a
time delay selectable between 0 and 900 seconds. The unit-reset delay is from 0.00 to 900.00 seconds.
Table 5–70: 81O UNIT SETPOINTS
The snapshot event setpoint enables or disables the snapshot event generation for this unit.
SETPOINT > CONTROL ELEMENTS > UNDERFREQUENCY
UNDERFREQUENCY 1 > UNDERFREQUENCY 2 > UNDERFREQUENCY 3
SETPOINT DESCRIPTION NAME DEFAULT VALUE STEP RANGE
Function permission Function DISABLED N/A [DISABLED – ENABLED]
Pickup level Pickup Level 49.50 0.01 Hz [20.00 : 65.00]
Trip time Trip Delay 0.00 0.01 s [0.00 : 900.00]
Reset time Reset Delay 0.00 0.01 s [0.00 : 900.00]
Minimum voltage threshold Minimum Voltage 30 1 V [30 : 300]
Snapshot event generation Snapshot Events ENABLED N/A [DISABLED – ENABLED]
SETPOINT > CONTROL ELEMENTS > OVERFREQUENCY
OVERFREQUENCY 1 > OVERFREQUENCY 2 > OVERFREQUENCY 3
SETPOINT DESCRIPTION NAME DEFAULT VALUE STEP RANGE
Function permission Function DISABLED N/A [DISABLED – ENABLED]
Pickup level Pickup Level 50.50 0.01 Hz [20.00 : 65.00]
Trip time Trip Delay 0.00 0.01 s [0.00 : 900.00]
Reset time Reset Delay 0.00 0.01 s [0.00 : 900.00]
Minimum voltage threshold Minimum Voltage 30 1 V [30 : 300]
Snapshot event generation Snapshot Events ENABLED N/A [DISABLED – ENABLED]
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