Specifications

4
BE1-CDS220
(Request bulletin UHP)
Features
PROTECTION
• Percentage Restrained Current Differential with
harmonic restraint
• Optional Restricted Ground Fault
• Three each Phase, Neutral, and Negative Sequence
Instantaneous Overcurrent elements with settable time
delay
• Three each Phase, Neutral, Ground, and Negative
Sequence Time Overcurrent elements
• All U.S. and IEC timing curves plus user-programmable
curve
• Breaker Failure protection function
• Two general purpose logic timers
• Four protection settings groups with external or
automatic selection modes
CONTROL
• One Virtual Breaker Control Switch and eight virtual
selector switches–controllable from both HMI and
communication ports
INSTRUMENTATION
• Real time phase, neutral, and negative sequence
currents for each 3 phase CT input circuit
• Real time ground current for optional independent
ground input
• Real time tap and phase compensated restraint and
operate currents for each differential element
• 1% meter accuracy down to 10% of nominal current
REPORTS
• Current Demands for phase, neutral, and negative
sequence for designated CT
• Optional 4000-point log of demand reading
• Breaker operations counter and contact wear duty
• Transformer through-fault duty statistics
FAULT RECORDING
• 255 event sequence of events report
• Fault summary reports; two most recent Fault Summary
Records saved to nonvolatile memory
• 240 cycles oscillography memory @ 24 samples/
cycle
• SER and Fault reporting doubled with Load Profile
option is selected
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
Functional Description
The BE1-CDS220 Current Differential System is an
economical, microprocessor based, multifunction system. It
is fully drawout and fits cutout, drilling, and behind-panel
projection dimensions for common Basler, GE, and
Westinghouse differential relays. It provides:
• Two input, three phase percentage • Transformer monitoring
differential with harmonic restraint • Breaker monitoring
• Metering functions in an integrated • Frequency compensation
system with communications • Breaker failure protection
• Three phase, ground, and negative • Phase shift and tap
sequence overcurrent protection compensation
with control
Application
This powerful protection system provides percentage
restrained differential protection along with multiple overcur-
rent elements. It is intended for use in any low impedance
current differential protection application including trans-
former, generator, motor, and bus protection. Its unique
capabilities make it ideally suited for applications:
• Requiring low burden to extend the linear range of CTs.
• Where dedicated CTs for the differential are not
available.
• Requiring high accuracy across a wide frequency range
such as for motor, generator, and generator step-up
transformer protection or in cogeneration facilities.
• Requiring the flexibility provided by wide settings
ranges, multiple settings groups, and multiple
coordination curves in one unit.
• Requiring the economy and space savings provided by a
multifunction, multiphase unit that provides all the
protection, along with local and remote indication,
metering, and control required on typical circuits.
• Requiring harmonic restraint.
• Requiring communication capability and protocol
support.
• Where optional case configurations facilitate protection
and control system modernization projects.
• Where the capabilities of a digital multifunction relay
with drawout construction are required.
1 BE1 NUMERICAL SYSTEMS