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2.2 SPECIFICATIONS
WAVEFORM CAPTURE
Data channels:
Sample rate:
Trigger source:
2
Trigger position:
Storage capacity:
SYNCHROCHECK
Voltage difference:
Phase difference:
Frequency difference:
Bypass permissives:
SETPOINT GROUPS
Number of groups:
Accessibility:
Included features:
UNDERVOLTAGE RESTORATION
Initiated by:
Minimum voltage level:
Time delay:
Incomplete seq. time:
Phases:
Level accuracy:
Timing accuracy:
2-10
Courtesy of NationalSwitchgear.com
4 currents, 3 voltages, 14 logic input
states and 8 output relays
16 per cycle
Element pickup/trip/dropout, control/
alarm event, logic input or manual com-
mand
0 to 100%
2 to 16 events with 2048 to 256 samples
of data respectively
0.01 to 100.00 kV in steps of 0.01
0 to 100° in steps of 2
0.00 to 5.00 Hz in steps of 0.02
DB & DL (dead bus and dead line)
LL & DB (live line and dead bus)
DL & LB (dead line and live bus)
DL | DB (dead line or dead bus)
DL
DB (either dead line or dead bus)
X
4
Can be changed from logic input or
through communications
TOC Curves, Phase TOC and IOC, Neu-
tral TOC and IOC, Ground TOC and
IOC, Negative Sequence OC and Volt-
age, Phase Directional, Ground Direc-
tional, Overvoltage, Undervoltage,
Underfrequency, Breaker Failure
Trip from Undervoltage 1, 2, 3 or 4
×
0.00 to 1.25
VT in steps of 0.01
0.1 to 100.0 s in steps of 0.1
1 to 10000 min. in steps of 1
Any one, any two, or all three (program-
mable) phases must operate for output
per voltage input
±100 ms
750/760 Feeder Management Relay
EVENT RECORDER
Number of events:
128
Content:
event cause, 3 phase current phasors, 1
ground current phasor, sensitive ground
current phasors, 3 voltage phasors, sys-
tem frequency, synchronizing voltage,
synchronizing frequency, and analog
input level with a 1 ms time stamp.
LAST TRIP DATA
Records cause of most recent trip, 4 RMS currents, and 3 RMS
voltages with a 1 ms time stamp.
UNDERFREQUENCY RESTORATION
Initiated by:
Trip from Underfrequency 1 or 2
Minimum voltage level:
0.00 to 1.25
Minimum freq. level:
20.00 to 60.00 Hz in steps of 0.01
Time delay:
0.1 to 100.0 s in steps of 0.1
Incomplete seq. time:
1 to 10000 min in steps of 1
Level accuracy:
Per voltage and frequency input
Timing accuracy:
±100 ms
MANUAL CLOSE FEATURE BLOCKING
Operated by:
manual close command.
Programmability:
Block IOC for a selected period.
Raise TOC pickup for a selected period.
COLD LOAD PICKUP FEATURE BLOCKING
Operated by:
logic input command or automatically
Programmability:
Block IOC for a selected period.
Raise TOC pickup for a selected period.
TRANSFER SCHEME
Applicability:
Used for double-bus system with two
normally-closed incoming and one nor-
mally-open bus tie circuit breaker.
Closing:
Automatic closing of the bus tie breaker
after a loss of one source, with bus
decayed voltage permissive.
Trip:
Trips a pre-selected breaker after the
third breaker is manually closed (pre-
vent-parallel operation).
AUTORECLOSE (760 ONLY)
Reclose attempts:
Up to four (4) before lockout.
Blocking:
Each reclose shot can block IOC and
raise TOC Pickup.
Adjustability:
Current supervision can adjust the maxi-
mum number of shots to be attempted.
2 INTRODUCTION
2.2.6 CONTROL ELEMENTS
×
VT in steps of 0.01
GE Multilin
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