Phase Current - GE Feeder Management Relay 750 Instruction Manual

5.6 S5 PROTECTION
a) MAIN MENU
PATH: SETPOINTS S5 PROTECTION

PHASE CURRENT

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Phase overcurrent protection comprises two time overcurrent, two instantaneous overcurrent, and a phase directional ele-
ment. The directional element determines whether current flow is in the forward or reverse direction, as determined by the
connected polarity of the input CTs and the Maximum Torque Angle selected for the phase directional element. Each phase
overcurrent element can be programmed to either disable directionality or provide a trip for current flow in the forward/
reverse direction only. Two elements allow the use of 'Loset' and 'Hiset' detectors in autoreclose applications, zone-selec-
tive (blocking) schemes, and distinct settings for faults in different directions. Phase overcurrent protection elements can be
blocked individually or by logic inputs.
5
b) PHASE TIME OC
PATH: SETPOINTS S5 PROTECTION
PHASE TIME OC 1
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Phase Time Overcurrent 1 and 2 are identical elements. Each consists of the equivalent of three separate time overcurrent
relays, ANSI Device 51P, with identical characteristics. These elements can be controlled by the phase directional element,
providing operation for current flow in the permitted direction only. Voltage restrained operation which reduces the pickup
level with reduced voltage is also available.
5-36
Courtesy of NationalSwitchgear.com
PHASE CURRENT
ð
ENTER PHASE TIME OC 1
ESCAPE
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PHASE TIME OC 2
ESCAPE
MESSAGE [ENTER] for more
PHASE INST OC 1
ESCAPE
MESSAGE [ENTER] for more
PHASE INST OC 2
ESCAPE
MESSAGE [ENTER] for more
PHASE DIRECTIONAL
ESCAPE
MESSAGE [ENTER] for more
PHASE CURRENT PHASE TIME OC 1(2)
ð
PHASE TIME OC 1
ENTER
ESCAPE
FUNCTION: Trip
PHASE TIME OC 1
ESCAPE
MESSAGE RELAYS (3-7): -----
PHASE TIME OC 1
ESCAPE
MESSAGE PICKUP: 1.00 x CT
PHASE TIME OC 1
ESCAPE
MESSAGE CURVE: Ext. Inverse
PHASE TIME OC 1
ESCAPE
MESSAGE MULTIPLIER: 1.00
PHASE TIME OC 1
ESCAPE
MESSAGE RESET: Instantaneous
PHASE TIME OC 1
ESCAPE
MESSAGE DIRECTION: Disabled
PHASE TIME OC 1 VOLT
ESCAPE
MESSAGE RESTRAINT: Disabled
750/760 Feeder Management Relay
5.6.2 PHASE CURRENT
See below
See page 5–38.
See page 5–39.
Range: Disabled, Trip, Trip & AR, Alarm, Latched Alarm,
Control
Range: Any combination of 3 to 7 Auxiliary relays
Range: 0.05 to 20.00 x CT in steps of 0.01
Range: see Table 5–4: TOC Curve Selections on page
5–32 for values
Range: 0.00 to 100.00 in steps of 0.01
Range: Instantaneous, Linear
Range: Disabled, Forward, Reverse
Range: Enabled, Disabled
5 SETPOINTS
GE Multilin