BE1-851E
2
FEATURES
PROTECTION
• Phase, Neutral, and Negative Sequence
Instantaneous Overcurrent elements with settable
time delay: 50TP, 150TP, 50TN, 150TN, 50TQ,
150TQ
• Phase, Neutral, and Negative Sequence Time
Overcurrent elements: 51P, 51N, 51Q
• All U.S. and IEC timing curves plus user program-
mable curve
• Responds to either Average AC, Fundamental, or
Wide band RMS to 7th harmonic
• Minimizes transient overreach and overtravel on
overcurrent elements
• Separate ground current input
• Breaker Failure protection function: BF
• Two general purpose logic timers: 62, 162
• Programmable Logic using BESTlogic
• Four protection setting groups with external or
automatic (cold load pickup, load, unbalance,
recloser shot) selection modes
CONTROL
• Four shot recloser with zone sequence coordina-
tion and sequence controlled protective element
blocking functions
• 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
INSTRUMENTATION
• Real time A, B, C phase, neutral, and negative
sequence currents
• 1% meter accuracy down to 10% of nominal current
REPORTS
• Current demands for phase, neutral, and negative
sequence currents—magnitudes and time stamps
are recorded for today's peak, yesterday's peak,
and peak since reset
• Breaker operations counter and contact
interruption duty
FAULT RECORDING
• 255 event sequence of events report with I/O and
alarm sub-reports
• Fault Reporting; 1 or 2 oscillography records per
fault report
• Fault summary reports; two most recent Fault
Summary Records saved to non-volatile memory
• 16 fault records, 15 cycles long @ 24 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 or other common
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 (optional
normally open or normally closed)
• Extensive internal diagnostics monitor all internal
functions of the relay
• More than 20 additional alarm points—
programmable for major or minor priority
Including:
-
Reclose fail and lockout
- Phase demand overload alarm
- Neutral and negative sequence unbalance demand
alarms
- Three breaker alarm points—programmable for slow
trip, interruption duty threshold, or operations counter
- Trip circuit voltage and continuity monitor
- Close circuit monitor via BESTlogic
PROGRAMMABLE I/O
• Four programmable inputs
• Seven programmable outputs and one dedicated
programmable alarm output
HARDWARE FEATURES
• Full drawout
- H1:Half-rack
• Active CT technology for low burden and
increased dynamic range
• Flash Memory for upgrading embedded
programming without changing chips
• Real Time Clock with 8 hour capacitor ride
through and optional battery backup
• Integral HMI with 2x16 character display
• Wide range ac/dc power supply options provide
long hold up time to ride through dips on ac
power source. (100 ms with 4 output relays
energized, upon complete loss of source. Starting
voltage 125Vac for Option 1 (48/125Vac/dc) and
250Vac for Option 2 (125/250Vac/dc))
