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BE1-CDS220 Guide Form Spec

[BASLER ELECTRIC BE1-CDS220 Guideform Specification] 

This specification describes requirements for a numeric multifunction Differential Overcurrent Protection System (communicating microprocessor-based relay) for use in any low impedance current differential protection application, including transformer, generator, motor, and bus protection. The relay system shall have a 7-year warranty. The relay system shall provide protection, monitoring, local and remote control, and standard automation protocols. Relay self-checking functions shall be included. Specific requirements are as follows:



Phase Differential (87) The relay system shall include a 2 input 3-phase percentage restrained differential element (87R). Each input circuit shall have programmable tap compensation for balancing input current magnitude. Each input circuit shall have the ability to compensate for phase angle differences and independently for zero sequence current blocking (ground source) due to transformer winding and/or sensing CT configuration. The 87R restraint slope shall be configurable to operate based on either the maximum restraint signal or the average of the restraint signals. The 87R restraint shall include a single settable slope characteristic, with a settable minimum pickup level. It shall include a transient blocking algorithm to provide security during extreme CT saturation without compromising sensitivity during large faults. The relay system shall include harmonic restraint functions to block 87R during transformer inrush and overexcitation conditions. The relay system shall use 2nd harmonic content of the calculated unbalance current to detect transformer energization and 5th harmonic content of the calculated unbalance current to detect transformer overexcitation conditions. The harmonic restraint functions shall be capable of being independently disabled for generator, motor, or bus applications. The relay system shall include settable unrestrained differential elements (87U) to operate for large magnitude unbalances regardless of percent restraint or harmonic restraint. The 87 elements shall include a differential alarm function for alarming.

[Optional Ground Differential (87ND) The relay shall include an optional independent ground input for 1 neutral percentage restrained differential element (87ND). The 87ND functions shall operate on the differential between the measured ground current (IG) and the residual from a 3-phase wye connected CT input circuit. The 87ND element shall be through-current restrained, with settable slope. It shall include a transient blocking algorithm, similar to 87R element, to provide security.



Phase Faults   (50/51P, 50/51Q) The relay system shall include 3 sets of phase and negative sequence time overcurrent elements, 3 phase instantaneous overcurrent elements, and 3 negative sequence instantaneous overcurrent elements, for detecting phase faults. One 51-phase time overcurrent element shall also have voltage control or voltage restraint mode of operation (51V). Each instantaneous element shall have an adjustable definite time delay. Each overcurrent element shall be assignable to either input circuit.

Ground Faults (50/51N) The relay system shall include 3 neutral time overcurrent elements and 3 neutral instantaneous overcurrent elements that operate on the calculated residual (3I0) of the selected winding [OPTION: or an independent ground input] for detection of ground faults. Each instantaneous element shall have an adjustable definite time delay.



Settings Groups The relay shall have 4 user-programmable settings groups.

Input/Output The relay shall have 8 optically isolated inputs, 6 general purpose output contacts, and one fail-safe normally closed alarm output contact. Each output shall be isolated and rated for tripping duty (30A for 0.2 seconds, 7A continuous). 

Virtual Control Switches (43/101) The relay shall include 8 virtual selector switches (x43) and one virtual breaker control switch (101), controllable from both the HMI and communication ports.

Relay Logic The relay shall include programmable logic for each output, for all inputs, and at least 9 additional virtual outputs for user programming.

Logic Timers (62) The relay shall include 2 logic timers (x62) to aid in the development of custom logic.

Terminal Blocks and Wiring Other than RS-232 wiring, all connections, including RS-485 wiring and IRIG-B wiring, shall be to barrier terminal strips capable of accepting ring lug connection. RS-232 wiring shall be to DB9S female connectors on the front and rear. RS-232 wiring shall be configured to allow 1-to-1 wiring to the DTE port on a PC, without need for null-modem adaptors or proprietary cabling or connectors.

HMI/DISPLAY A backlit graphical LCD display shall be provided integral to the relay, along with a 4 key cursor/navigation keypad. Separate target/alarm reset and settings edit pushbuttons shall be included. Keypad/pushbuttons shall include a continuous, flexible, water-resistant membrane overlay over all keys. The LCD display shall be programmable.



Oscillography and Sequential Events Recorder (SER) The relay shall be capable of automatically recording disturbance events of 15 to 40 cycles (total 240 cycles) (user adjustable) [OPTION: 15 to 80 cycles based on expanded memory, total 480 cycles], with 3 cycles of prefault duration and user-defined triggering. The relay shall include a Sequence of Events Recording function (SER) that stores the latest 255 events. 

Nonvolatile Status and Trip Target LEDs The relay shall hold all programmed target and alarm information in nonvolatile memory and provide that information locally through the HMI/LEDs and remotely via communication ports. Relay shall have three programmable alarm bits: Major, Minor, and Logic, based upon relay logic states.

Real Time Metering The relay shall include real time metering including magnitude and angle, for all measured phase and neutral currents and all derived neutral and negative sequence currents. Metering, including magnitude and angle, shall also be provided for the phase and tap compensated restraint, second and fifth harmonic, and differential currents.

Demand Metering The relay shall include user-settable current demands for phase, neutral, and negative sequence currents, with magnitudes and time stamps recorded for today's peak, yesterday's peak, and peak since reset. [OPTION: A 4000 Point Load Profile Demand Log shall store all demand values at a selectable interval from 1 to 60 minutes.]

Circuit Breaker Monitor The relay shall include breaker status and operations counter reporting, fault current interruption duty monitoring, and trip-speed monitoring for one breaker. Trip coil monitor circuits shall be provided for each trip circuit for continuity monitoring. No additional external wiring shall be required to implement the trip circuit monitor function. One breaker Fail (50BF) protection shall be assignable to any of the current input circuits.



Relay Interface The relay shall include three independent general-purpose communication ports including a front and rear RS-232 port and a rear RS-485 port. All communications ports shall support ASCll protocol,. and the RS-485 port shall support Modbus™ or DNP3.0 options.

[OPTION: Modbus RTU Slave Communications The relay shall incorporate Modbus RTU slave protocol internally. External converters or adapters are not acceptable.]

[OPTION: Distributed Network Protocol (DNP) The relay shall incorporate certified DNP 3.00 Level 2 Slave protocol communications capability internally. External converters or adapters are not acceptable.]

IRIG-B The relay shall include an interface port for a demodulated IRIG-B time synchronization input signal. IRIG-B connection shall be to a barrier terminal strip capable of accepting ring lug terminated wiring.

PC Interface The relay shall be capable of being set by Windows-based graphical user interface and ASCII terminal interfaces.



PC Software:  PC software compatible with Windows 98, NT, 2000, XP Home, XP Professional, and Windows Me shall be included at no charge. The software shall be freely reproducible within the end user’s organization without additional charge. The software must include serial communications for settings upload and download, graphical programming and display of logic equations (including pictorial display of AND and OR gates) and the ability to display and print COMTRADE oscillography and event files.


  1. CASE OPTIONS (packaging):

MX Case The relay shall be packaged in a case suitable for 19” rack or semi-flush panel mounting. The electronics module, including all active circuitry, must be extractable as a single unit, without need to disconnect or disturb any wiring. Shorting links for current circuits shall be internal to the relay case and shall remain in the case when the electronics module is extracted. The case shall be available in either horizontal (landscape) or vertical (portrait) configurations. Mounting plates shall be available as standard option to match standard “M1”, “M2”,” FT31”, and “FT32’” type relay panel openings. 


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