Specifications

3
BE1-951
(Request bulletin UHR)
Features
PROTECTION
• Two each Phase, Neutral, and Negative Sequence
Instantaneous Overcurrent elements with settable
time delay
• One Phase, Two Neutral, and One Negative Sequence
Time Overcurrent elements
• Neutral Overcurrent elements can be assigned to
calculate residual or optional independent ground input
• Phase Overcurrent element has capability of voltage
restraint or control
• Breaker Failure protection function
• Under and overvoltage protection
• Negative sequence overvoltage protection
• Four protection settings groups
• Fuse loss protection
CONTROL
• Four shot automatic recloser
• One virtual breaker control switch and four virtual
selector switches–controllable from both HMI and
communication ports
INSTRUMENTATION
• Real time three phase watts, vars, and power factor
• Real time frequency, current, and voltage
• Real time ground current for optional independent
ground input
• Watt hour and Var hour
REPORTS
• Demand reporting
• Breaker operations counter and contact wear duty
• 255 event sequence of events report
• Fault and oscillography records: Settable 6-16
• 240 cycles oscillography memory @ 12 samples/cycle
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.
• More than 20 additional alarm points–programmable
for major or minor priority provided by virtual control
and selector switches with select-before-operate logic
through programmable outputs
Functional Description
The BE1-951 Overcurrent Protection System is an
economical, microprocessor based, multifunction system.
Using Basler Electric’s innovative half-rack, drawout design,
systems can be dovetailed to form a standard 19” rack mount
installation with no special mounting hardware. Using adapter
plates, the S1 style fits cutout, drilling, and behind-panel
projection dimensions for common Basler Electric, GE, and
Westinghouse unit case relays. This protection system pro-
vides:
• Three phase, ground, and • Breaker failure
negative sequence overcurrent • Breaker monitoring,
protection with four shot recloser metering, and control
• Twelve samples per cycle digital functions
signal processing with • Frequency tracking and
frequency compensation voltage restrained
• Auto configuring voltage sensing overcurrent
circuits • Over/underfrequency
and voltage
Application
The BE1-951 Overcurrent Protection System is intended for
use in any directional or nondirectional overcurrent protection
application. Its unique capabilities make it ideally suited for
applications:
• Requiring low burden to extend the linear range of CTs.
• Requiring high accuracy across a wide frequency range
such as motor, generator, and generator step-up
transformer protection or in cogeneration facilities.
• 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 directional control and fault locating.
• Where overexcitation protection is required, such as
transformer backup applications.
• Requiring communications and protocol support.
• Where the capabilities of digital multifunction relays
with drawout construction are desirable.
• Where bus protection is provided by a high speed
overcurrent blocking scheme on the transformer bus
mains instead of a dedicated bus differential circuit.
• Where space constraints dictate protection systems
with small size and minimal behind-panel projection
for substation modernization projects.