Specifications

2
Functional Description
The BE1-851 Overcurrent Protection System is an economi-
cal, microprocessor based, multifunction system. It is fully
drawout and fits cutout, drilling, and behind-panel projection
dimensions for common Basler, GE, and Westinghouse relays.
It provides:
• Three phase, ground, and • Choices are fundamental,
negative sequence overcurrent RMS, or average sensing
protection with four shot recloser algorithms.
• Twenty-four samples per cycle • Control and metering
digital signal processing with functions
selectable algorithms • Breaker monitoring
• Breaker failure • Programmable LCD
• Three drawout case configurations display
Application
The BE1-851 Overcurrent Protection System is intended for
use in any nondirectional overcurrent protection application.
Its unique capabilities make it ideally suited for applications:
• Requiring low burden to extend the linear range of CTs.
• Requiring the flexibility provided by wide setting ranges,
multiple setting groups, and multiple coordination curves
in one unit.
• Requiring the economy and space savings provided by a
multifunction, multiphase unit, while providing all of the
protection, local and remote indication, metering, and
control functions required on a typical circuit.
• Requiring communication capability.
• Requiring specific current response characteristics.
• Where optional case configurations facilitate
modernizing protection and control systems in existing
substations.
• Where the combination of digital multifunction relays
and test paddles and/or drawout construction are
mandated.
• In applications where bus protection is provided by a
high speed bus overcurrent blocking scheme instead of a
dedicated bus differential circuit.
• Where the capabilities of intelligent electronic devices
(IEDs) are used to decrease relay and breaker
maintenance costs.
BE1-851
(Request bulletin UHM)
Features
PROTECTION
• Sensing Input Type G
- Three Phase and four Neutral Instantaneous
Overcurrent elements with settable time delay
-One Phase and two Neutral Time Overcurrent elements
• Sensing Input Type H
-Two each Phase, Neutral, and Negative Sequence
Instantaneous Overcurrent elements with settable time
delay
-One each Phase, Neutral, and Negative Sequence Time
Overcurrent element
• All U.S. and IEC timing curves plus user-programmable
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
• Two general purpose logic timers
• Four protection settings groups with external or
automatic (cold load pickup, load unbalance, recloser
shot) selection modes
CONTROL
• Four shot recloser with zone sequence coordination
and sequence controlled protective element blocking
functions
• One virtual breaker control switch and four virtual
selector switches controllable from both HMI and
communication ports
INSTRUMENTATION
• Real time phase, neutral, and negative sequence
currents
• 1% meter accuracy down to 10% of nominal current
REPORTS
• Demand reporting
• Breaker operations counter and contact wear duty
• 255 event sequence of events report with I/O and
alarm subreports
• Fault summary reports; two most recent
• Fault summary records saved to nonvolatile memory
• Sixteen fault records, 15 cycles long @ 24 samples/cycle
• COMTRADE format
SELF TEST AND ALARM FUNCTIONS
• Relay Fail, major alarm, minor alarm LEDs, and
fail-safe alarm output contact
• Extensive internal diagnostics monitor all internal
functions of the relay.
1 BE1 NUMERICAL SYSTEMS