Basler Electric BE1-CDS240 Current Differential System

The BE1-CDS240 Current Differential System is an economical, microprocessor based, multifunction

system that provides a four input, three-phase percentage differential with harmonic restraint protection.

Also included is three-phase with voltage control, ground, and negative-sequence overcurrent protection,

voltage and frequency protection, breaker failure for up to four breakers, breaker monitoring for four

breakers, transformer monitoring, and metering functions, all in an integrated system with several

communications options. The BE1-CDS240 Current Differential System is intended for use in any low

impedance current differential protection application including transformer, generator, motor, and bus

protection. Four setting groups are provided for adaptive relaying with automatic selection logic for cold

load pickup and/or dynamic setting group changes.

The BE1-CDS240 can be ordered with 12 programmable contact sensing inputs, 10 programmable outputs,

and one alarm output or eight programmable contact-sensing inputs, 14 programmable outputs and one

alarm output. Outputs can be assigned various functions by logical programming to perform protection,

control, or indicate operations. For example, protection functions can cause a protective trip operation.

Control functions can cause a manual trip, manual close, or automatic reclose operation. Indicators could

be relay alarm, setting group one enable, setting group two enable and others.

Protection scheme designers may select from an embedded pre-programmed logic scheme or from a

number of logic library schemes found in BESTCOMS™ to perform the most common protection and control

requirements or create a custom scheme using BESTlogic.

The BE1-CDS240 is available in a fully draw-out MX case with configurations for horizontal 19" rack

mounting, horizontal panel mounting and vertical panel mounting. BE1-CDS240 features include:

• Up to four restraint inputs (four three-phase current circuits) and two virtual current circuits that

can be used with any combination of two current inputs

• Independent ground input

• Three voltage inputs (Va, Vb, Vc, to Vn)

• Three-phase percentage differential protection with harmonic restraint

• Three-phase voltage, frequency and overcurrent protection

• Four setting groups

• One embedded preprogrammed logic scheme

• Fourteen or 10 programmable outputs

• Eight or 12 contact sensing inputs

• Breaker failure protection for four breakers

• Front panel HMI (human-machine interface)

• Communications ports: one front RS-232, one rear RS-232, one rear RS-485 and one rear

IRIG port

• Communications protocols available: DNP3, Modbus® RTU, and ASCII

• Sequence of events recording

• Fault recording

• Oscillography

• Demand reporting

• Differential current monitoring

• Optional load profile reporting