Basler Electric 9319700103 BE3-27T/59T-3A1N3 Ac Voltage Relay

from the DECS-400 or DECS-450 Digital Excitation Control

System and then calculates a time delay based on the zero

crossing of each phase of voltage from the synchronizing

transformer. At the end of the time delay, the IFM-150 produces

the properly synchronized sets of pulses to drive the SCRs of

the excitation system rectifier chassis. As the DECS control

signal increases (or decreases), the time interval between the

zero crossing of each phase voltage and the start of its next

output pulse will decrease (or increase).

This results in an increase (or decrease) in the rectifier chassis

output voltage.

A terminal voltage limiter within the IFM-150 can be enabled to

monitor the generator voltage through the  synchronizing

transformer or external voltage transducer and compare the

measurement with a user adjustable reference level.

If the generator voltage exceeds the reference level for a user

-adjustable amount of time, the IFM-150 will modify the SCR

firing pulses and limit the generator voltage.

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 IFM-150 Interface Firing Module receives a control signal.