2
FEATURES
PROTECTION
•
Phase and Neutral Instantaneous Overcurrent
elements with settable time delay: 50TP, 50TN
•
Phase, Neutral, and Negative Sequence Time
Overcurrent elements: 46, 51P, 51N, 151N
•
Phase overcurrent element
(s·,
P) includes capabil
ity of voltage restraint or voltage control.
•
Internally calculated phase residual, 310, available
on all relays. Optional independent ground input
available. Neutral overcurrent elements (50TN, 51 N,
151 N) monitor either ground or calculated residual.
•
Negative sequence overcurrent element (46)
includes algorithm for timing based on generator
K
factors or may use standard TOC curves.
•
All U.S. and IEC timing curves plus user program
mable curve.
•
Phase Undervoltage and Overvoltage elements:
27P, 127P, 59P, 159P. Elements use a 1 of 3, 2 of
3, or 3 of 3 logic, and monitor either line-line or line
ground voltages.
•
Auxiliary Undervoltage and Overvoltage elements:
27X, 127X, 59X, 159X. Elements monitor either
fundamental or third harmonic on the optional
auxiliary 4th
VT
input, or fundamental phase
residual, 3VO, of the phase inputs.
•
Negative Sequence Overvoltage element: 47
•
Overexcitation, Volts per Hertz element: 24
•
Four Under/Overfrequency elements: 81, 181, 281,
381
•
Forward/Reverse Power: 32, 132
•
Loss of Excitation (offset sloped VAR flow algo-
rithm): 400, 1400
•
Breaker Failure protection function: BF
•
4 general purpose logic timers: 62, 162, 262, 362
•
Inadvertent energization protection using 50
elements supervised by 81 and/or 27 elements
•
100% stator ground fault protection using auxiliary
voltage elements for ground overvoltage and 3rd
harmonic ground undervoltage
•
Sync check and/or dead bus close supervision
25, 27X (Requires optional 4th
VT
sensing circuit)
•
Programmable Logic using BESTiogic
•
Two protection settings group controllable via relay
logic, 43 Aux switches, and hardwired inputs.
Setting group selection may control tripping logic.
•
Fuse loss detection (60FL) protects against false
trip due to loss of voltage sensing.
CONTROL
•
Virtual breaker control switch-controllable from
both HMI and com. ports: 101
•
Four virtual selector switches-controllable from
both HMI and com. ports: 43, 143, 243, 343
•
Communication port control of 1 01 and #43
switches allows for SCADA control of relay and
breaker.
INSTRUMENTATION
•
Real time A, B, C phase current, voltage; fre
quency; and derived neutral and negative
sequence current and voltage.
•
Real Time 3 phase Watts, VARs, and Power
Factor.
REPORTS
•
Current demands for phase, ground, and negative
sequence currents, and forward and reverse Watts
and VARs-magnitudes and time stamps are
recorded for today's peak, yesterday's peak,
and peak since reset.
•
kWh and kVARh, forward and reverse
•
Breaker operations counter and contact
interruption duty. Breaker operate time also
available.
FAULT RECORDING
•
255 event sequence of events report with 1/0 and
alarm sub-reports
•
Fault Reporting; 1 or 2 oscillography records per
fault report
•
16 fault summary reports; two most recent Fault
Summary Records saved to non-volative memory
•
Total number of fault and oscillography records
settable from 6 to 16
•
Total of 240 cycles oscillography memory@ 12
samples/cycle
•
COMTRADE format
COMMUNICATION PORTS
•
Three independent general purpose communica
tion ports
- Front RS-232 ASCII communications
- Rear RS-232 ASCII communications
- Rear RS-485 ASCII, Modbus®, DNP®3.0, and TNP
protocols
•
IRIG-B time sync (unmodulated)
SELF TEST AND ALARM FUNCTIONS
•
Relay fail, major alarm, and minor alarm LEDs,
and fail-safe alarm output contact.
•
Extensive internal diagnostics monitor all internal
functions of the relay.
•
More than 20 additional alarm points
programmable for major or minor priority
including:
- User defined logic state alarms that may be
associated with any user specified relay logic
state or relay protective element status.
- Phase current, and forward and reverse Watt and
VAR demand alarm.
- Neutral and negative sequence unbalance
demand alarms.
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