GE Feeder Management Relay 750 User Manual

GE Multilin 750/760 Feeder Management Relay 5-105
5 SETPOINTS 5.8 S7 CONTROL
5
5.8.5 UNDERVOLTAGE RESTORATION
PATH: SETPOINTS ÖØ S7 CONTROL ÖØ UNDERVOLT RESTORE
This scheme is initiated by a trip of either the Bus or Line Undervoltage elements. After the feeder breaker has been
tripped, it will display the UVolt Restore Init message and operate any programmed output relays. Once initiated it will mon-
itor the bus voltage level, and send a close command to the Close Relay when the voltage on the programmed number of
phases has risen above the programmed level for a selected time interval. The scheme is equipped with an incomplete
sequence timer, so it will not remain initiated for an indeterminate time, but will automatically reset if the voltage does not
recover during the programmed interval. Initiation of the scheme can be canceled by a reset command. Cancellation of a
previous initiation is only effective if the voltage is above the restoration threshold. A “Block Restoration” logic input is avail-
able to prevent both initiation and operation. It is recommended that if automatic undervoltage restoration is to be used, that
the cold load pickup feature is also enabled, to prevent the breaker from tripping shortly after it is automatically closed.
Figure 5–64: UNDERVOLTAGE RESTORATION LOGIC
 UNDERVOLT RESTORE
 [ENTER] for more
UNDERVOLT RESTORE
FUNCTION: Disabled
Range: Disabled, Alarm, Latched Alarm, Control
UNDERVOLT RESTORE
RELAYS (3-7): -----
Range: Any combination of 3 to 7 Auxiliary relays
UNDERVOLT RESTORE
SOURCE: Bus
Range: Bus, Line
PHASES REQUIRED FOR
OPERATION: All Three
Range: Any One, Any Two, All Three. Seen only if
UNDERVOLT RESTORE SOURCE is "Bus"
UNDERVOLT RESTORE
MIN VOLTS: 0.90 x VT
Range: 0.00 to 1.25 x VT in steps of 0.01
UNDERVOLT RESTORE
DELAY: 10 s
Range: 0 to 10000 s in steps of 1
INCOMPLETE SEQUENCE
TIME: 100 min
Range: 1 to 10000 min. in steps of 1
ENTER
ESCAPE
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Courtesy of NationalSwitchgear.com

GE Feeder Management Relay 750 Specifications

General

Brand	GE
Model	Feeder Management Relay 750
Category	Protection Device
Language	English