Monitoring Elements - GE 750 Instruction Manual

750/760
Feeder Management Relay

Monitoring Elements

2–10
NEUTRAL DISPLACEMENT
Pickup level: 0.00 to 1.25 × VT in steps of
0.01
Dropout level: 97 to 98% of pickup
Curves: ANSI Extremely/Very/
Moderately/Normally Inverse,
Definite Time (0.1 s base
curve), IEC Curve A/B/C and
Short, FlexCurve™ A/B
(programmable curves), IAC
Extreme/Very/Inverse/Short
Curve multiplier: 0 to 100.00 in steps of 0.01
Reset type: Instantaneous/Linear
Level accuracy: 3 × voltage input error
Timing accuracy: ±50 ms
PHASE/NEUTRAL CURRENT
Pickup level: 0.05 to 20.00 × CT in steps of
0.01
Dropout level: 97 to 98% of pickup
Time delay: 0 to 60000 s in steps of 1
(Definite Time)
Level accuracy: per current input
Timing accuracy: ±100 ms
POWER FACTOR
Required voltage: >30% of nominal in all
phases
Pickup level: 0.50 lag to 0.50 lead in steps
of 0.01
Dropout level: 0.50 lag to 0.50 lead in steps
of 0.01
Time delay: 0 to 60000 s in steps of 1
(Definite Time)
Level accuracy: ±0.02
Timing accuracy: ±100 ms
ANALOG INPUT THRESHOLD
Pickup level: 0 to 65535 units in steps of 1
Dropout level: 2 to 20% of Pickup
(programmable, under/over)
Time delay: 0 to 60000 s in steps of 1
Level accuracy: ±1%
Timing accuracy: ±100 ms
ANALOG INPUT RATE
Pickup level: –1000 to 1000 units/hour in
steps of 0.1
Dropout level: 97 to 98% of Pickup
Time delay: 0 to 60000.0 s in steps of 1
Level accuracy: ±1%
Timing accuracy: ±100 ms
OVERFREQUENCY
Required voltage: >30% of nominal, phase A
Pickup level: 20.01 to 65.00 Hz in steps of
0.01
Dropout level: Pickup – 0.03 Hz
Time delay: 0.0 to 6000.0 s in steps of 0.1
Level accuracy: ±0.02 Hz
Timing accuracy:±34 ms at 60 Hz;
±40 ms at 50 Hz
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Specifications
REVERSE POWER (IF ENABLED)
Pickup level: 0.015 to 0.600 × rated power
Dropout level: 94 to 95% of pickup
Reset time: less than 100 ms
Level accuracy: see 3Φ Real Power metering
Time delay: 0.0 to 6000.0 s in steps of 0.1
Timing accuracy: ±200 ms (includes Reverse
Power pickup time)
FAULT LOCATOR
Range: –327 to 327 km (or miles)
0 to 65534 ohms
Memory: stores 10 most recent faults
DATA LOGGER
Channels: 8 channels; same parameters
as for analog outputs available
Sample rate: per cycle / per second / per
minute / every 5, 10, 15, 20,
30, or 60 minutes
Trigger source: pickup/trip/dropout, control/
alarm event, logic input,
manual command, or
continuous
Trigger position: 0 to 100%
Storage: 2 to 16 events with 2048 to
256 samples of data
respectively (4096 if
continuous)
TRIP COUNTERS
Accumulates all ground, sensitive ground,
neutral, negative sequence, and phase
overcurrent trips.
DEMAND
Demand accuracies are based on less
than 2 × CT and 50 to 130 V inputs.
NOTE
Measured values: Phase A/B/C current (A),
3Φ real power (MW), 3Φ
reactive power (Mvar), 3Φ
apparent power (MVA)
Measurement type:
Thermal Exponential, 90% response time
(programmed):
5, 10, 15, 20, 30, or 60 min.
Block Interval / Rolling Demand, time
interval (programmed):
5, 10, 15, 20, 30, or 60 min.
Block Interval with Start Demand Interval
Logic Input pulses
Amps pickup level: 10 to 10000 in steps of 1
MW pkp level: 0.1 to 3000.0 in steps of 0.1
Mvar pkp level: 0.1 to 3000.0 in steps of 0.1
MVA pkp level: 0.1 to 3000.0 in steps of 0.1
Level accuracy: ±2%
GE Multilin