Overview

A highly advanced integrated genset control system, this device

provides genset control, transfer switch control, metering, protection, and

programmable logic in a simple, easy-to-use, reliable, rugged, and cost

effective package.

Benefits

• Provides integrated engine-genset control, protection, and

metering in a single package.

• The Offline Simulator, provided in BESTlogic™Plus, helps test and

troubleshoot logic without the need for expensive hardware.

• Flexible programmable logic and programmable I/O make it easy

to expand the DGC-2020’s inputs and outputs with the CEM-2020

(Contact Expansion Module) and the AEM-2020 (Analog Expansion

Module). This saves time and money by eliminating unnecessary

external PLCs and control relaying.

Benefits

• Provides accurate frequency protection for a distribution system

or generator operating at 50 or 60 Hz.

• Accurate, repeatable, and reliable operation.

• Incrementally-staged load shedding possible with up to four

independent frequency set points.

• Flexible protection options with selectable overfrequency or

underfrequency sensing for each set point.

• Clear settings indication from individually adjustable time delays

and LED indicators for each frequency set point.

• Minimized PT (potential transformer) costs as a result of low

sensing burden.

• Reduced battery load with low burden power supply.

• LED targets provide clear annunciation of status.

• Easily perform in-case system and device tests using test plugs.

FEATURES

DECS-400 features and capabilities are listed below. The paragraphs following the list describe major

DECS-400 features and functions in more detail.

• Five excitation control modes

− Automatic Voltage Regulation (AVR)

− Field Current Regulation (FCR)

− Field Voltage Regulation (FVR)

− Power Factor (PF)

− Var

• Two pre-position setpoints (with adjustable traverse rate) for each excitation control mode

• Two PID groups

• Programmable analog control output selectable for 4 to 20 mAdc, –10 to +10 Vdc, or 0 to +10 Vdc

• Remote setpoint control input accepts analog voltage or current control signal

• Real-time metering

• Integrated power system stabilizer (PSS)

− Generator or motor control modes, accommodates phase rotation changes between modes

− Speed and power sensing or speed-only sensing

− Two-wattmeter or three-wattmeter methods of power measurement

• Soft start and voltage buildup control

• Four limiting functions

− Stator current

− Overexcitation

− Underexcitation

− Underfrequency compensation

− Reactive power

• Ten protection functions

− Field overvoltage

− Field overcurrent

− Generator undervoltage

− Generator overvoltage

− Loss of sensing voltage

− Generator frequency less than 10 hertz

− Loss of field (40Q)

− Field overtemperature

− Volts per hertz (24)

− Exciter diode failure

• IRIG time synchronization

• Sixteen contact inputs

− Six fixed-function inputs: AVR, Manual, Lower, Raise, Start, and Stop

− Ten user-programmable inputs

• Eight contact outputs

− Two fixed-function outputs: Watchdog, On/Off

− Six user-programmable outputs, configurable for maintained, latched, or momentary operation

• Four communication ports

− Front RS-232 port for interface with PC running BESTCOMS software

− Rear RS-485 port for dedicated communication with secondary, redundant DECS-400

− Rear RS-485 port using Modbus™ protocol for communication with remote terminal

− Rear RJ-45 port connects to onboard modem that provides dial-in and dial-out capability

• Data logging, sequence of events recording, and trending

INTRODUCTION

The DECS-400 Digital Excitation Control System is a microprocessor-based controller that offers

excitation control, logic control, and optional power system stabilization in an integrated package. The

DECS-400 controls field excitation by providing an analog signal used to control the firing (output) of an

external power bridge. The DECS-400 monitors generator or motor parameters and acts to control, limit,

and protect the machine from operating outside its capability.

The optional, onboard power system stabilizer is an IEEE-defined PSS2A, dual-input, “integral of

accelerating power” stabilizer that provides supplementary damping for low-frequency, local mode and

power system oscillations.

Integral programmable logic provides excitation system control and annunciation based on DECS-400

contact inputs, operating mode status, excitation system parameters, and user-defined programming.

Setup and initial operation are facilitated by Basler Electric’s user-friendly BESTCOMS PC software that

incorporates a test mode, flexible oscillography, and a graphic display of PSS test results.

The DECS-400 is designed for use with Basler Electric’s Interface Firing Module (IFM) and SSE or SSE-N

power bridges. However, it will work equally well with any power bridge with a firing circuit that is

compatible with the control signal output of the DECS-400.

Overview

BE1-81O/U relays provide accurate and secure protection for underfrequency

or overfrequency system conditions.

Features

• Reliable solid-state digital circuitry.

• Up to four independent frequency set points.

• Over or underfrequency sensing selectable for each set point.

• Convenient, precise selection of the set point frequency over the

nominal range of 40 to 70 Hz.

• Individually adjustable time delays and LED indicators for each

frequency set point.

• Optional definite time delay characteristic.

• Undervoltage inhibit prevents undesired relay operation and provides an

indication of the inhibiting condition over the adjustable range of 40 to

120 Vac.

• Excellent timing accuracy and repeatability.

• Low sensing and supply burdens.

CONTROL

Virtual breaker control switch controllable from

both HMI and com. ports: 101

Four virtual selector switches controllable from

both HMI and com. ports: 43. 143. 243. 343

Communication port control of 101 and #43

switches allows for SCADA control of relay and

breaker.

INSTRUMENTATION

Real time A, B, C phase current, voltage; fre

quency; and derived neutral and negative

sequence current and voltage.

Real Time 3 phase Watts, VARs, and Power Factor.

REPORTS

Current demands for phase, ground, and negative

sequence currents, and forward and reverse Watts

and VARs magnitudes and time stamps are

recorded for today’s peak, yesterday’s peak,

and peak since reset.

kWh and kVARh, forward and reverse

Breaker operations counter and contact

interruption duty. Breaker operate time also available.

FAULT RECORDING

255 event sequence of events report with I/O and

alarm sub-reports

Fault Reporting; 1 or 2 oscillography records per

fault report

16 fault summary reports; two most recent Fault

Summary Records saved to non-volative memory

Total number of fault and oscillography records

settable from 6 to 16

Total of 240 cycles oscillography memory @ 12

samples/cycle

COMTRADE format

Features

• Five control modes with autotracking between modes: AVR, FCR, FVR,

var, and PF

• Redundancy options including dual controllers

• 0.10% voltage regulation accuracy

• Paralleling provisions: network load sharing over Ethernet, reactive

droop, line drop, and cross-current compensation

• Integrated generator protection (24. 25. 27. 59. 81O/U, 32R, 40Q), Field

overvoltage, field overcurrent, field overtemperature, and exciter diode

monitoring

• Configurable protection expands the protection package, allowing the

user to customize protection elements for any sensed parameter

• Limiters include overexcitation, underexcitation, stator current, var and

underfrequency or V/Hz

• Auto tuning feature with two PID settings groups (Patent: US

2009/0195224 A1)

• Optional integrated Power System Stabilizer (PSS), IEEE Std. 421.5 type

PSS2A/2B/2C

• BESTlogic™Plus programmable logic is easy to configure and verify

• Integrated autosynchronizer (standard)

• Backward compatible with DECS-400 controllers

-Installation: Same footprint as DECS-400

-Wiring: A transition plate (optional) adapts DECS-450 terminals to

match DECS-400 terminal positions.

-Settings: Automatic PID/gain conversion from DECS-400 to DECS-450

-Logic: Predefined logic scheme to mimic DECS-400 behavior

• Trending, oscillography, and sequence of events recording

• Digital I/O: 14 programmable inputs, 11 programmable outputs, and

1 Form-C output dedicated to watchdog function

• Four analog meter driver outputs

• Expandable I/O via CAN bus communications

-AEM-2020: Adds 8 analog inputs, 8 RTD inputs, 2 thermocouple

inputs, and 4 analog outputs

-CEM-2020: Adds 10 digital inputs and 24 digital outputs

PROTECTION

Phase and Neutral Instantaneous Overcurrent

elements with settable time delay: 50TP, 50TN

Phase, Neutral, and Negative Sequence Time

Overcurrent elements: 46. 51P, 51N, 151N

Phase overcurrent element (51P) includes capabil

ity of voltage restraint or voltage control.

Internally calculated phase residual, 3I0. available

on all relays. Optional independent ground input

available. Neutral overcurrent elements (50TN, 51N,

151N) monitor either ground or calculated residual.

Negative sequence overcurrent element (46)

includes algorithm for timing based on generator

K factors or may use standard TOC curves.

All U.S. and IEC timing curves plus user program

mable curve.

Phase Undervoltage and Overvoltage elements:

27P, 127P, 59P, 159P. Elements use a 1 of 3. 2 of

3. or 3 of 3 logic, and monitor either line-line or line

ground voltages.

Auxiliary Undervoltage and Overvoltage elements:

27X, 127X, 59X, 159X. Elements monitor either

fundamental or third harmonic on the optional

auxiliary 4thVT input, or fundamental phase

residual, 3V0. of the phase inputs.

Negative Sequence Overvoltage element: 47

Overexcitation, Volts per Hertz element: 24

Four Under/Overfrequency elements: 81. 181. 281. 381

Forward/Reverse Power: 32. 132

Loss of Excitation (offset sloped VAR flow algo rithm): 40Q, 140Q

Breaker Failure protection function: BF

4 general purpose logic timers: 62. 162. 262. 362

Inadvertent energization protection using 50

elements supervised by 81 and/or 27 elements

100% stator ground fault protection using auxiliary

voltage elements for ground overvoltage and 3rd

harmonic ground undervoltage

Sync check and/or dead bus close supervision

25. 27X (Requires optional 4th VT sensing circuit)

Programmable Logic using BESTlogic

Two protection settings group controllable via relay

logic, 43 Aux switches, and hardwired inputs.

Setting group selection may control tripping logic.

Fuse loss detection (60FL) protects against false

trip due to loss of voltage sensing.

The BE1-GPS100 is a multifunction, programmable numerical protection, meter, and control

relay. Functions provided include three phase voltage controlled, voltage restrained, or

standard overcurrent, phase residual and independent ground overcurrent, negative sequence

overcurrent, breaker failure, over/underfrequency, phase over/undervoltage, zero sequence

over/undervoltage, and negative sequence overvoltage, forward or reverse power, loss of

excitation, volts per hertz, sync check, sensitive third harmonic ground fault monitoring, breaker

monitoring and control and metering functions, all in an integrated system.

ADVANTAGES

BESTlogic provides the user with very high flexibility in configuring a protection and control

system.

Substantial functionality in a small package, useful where space is very limited but high

functionality is needed.

Programmable LCD display allows the relay to replace local indication and control func

tions, such as panel metering, alarm annunciation, and control switches.

Three independent communication ports with protocol support allows integration with

distributed control systems.

Provides optional separate ground current input for those applications where this is

required.

Includes frequency tracking and voltage restrained overcurrent for backup and cogenera

tion applications.

Includes Real Time Clock with 8 hour capacitor ride through and optional battery backup.

Available in fully drawout half rack case. Two Basler Electric half rack IEDs (Intelligent

Electronic Devices) can be dovetailed together to mount in a standard 19-inch equipment

rack with no special mounting hardware.

Available in fully drawout S1 case with test paddle. The S1 case, with available adapter

plates, fits cutout, drilling and behind panel projection dimensions for common Basler

Electric, GE and Westinghouse unit case relays.

Overview

The DECS-450 is a microprocessor based, high performance, extremely reliable

excitation controller for positive and positive/negative forcing excitation systems.

It supplies control voltage to an external bridge, which supplies dc energy to the

main or exciter field of a synchronous machine, making it compatible with any

size machine. The DECS-450 comes in many configurations to satisfy specific

requirements and redundancy needs. Basler offers customized and standard

solutions to fit a wide variety of applications.

Benefits

• With its high levels of flexibility and reliability, the DECS-450 is

suitable for virtually any synchronous machine.

• Reduce your setup time with Basler’s intuitive BESTCOMSPlus®

software that simplifies complex setup with simple drag-and-drop

programmable logic (BESTlogic™Plus), visual real-time strip chart

capabilities, and cutting edge auto PID selection capabilities.

• The revolutionary auto tuning function automatically establishes

optimum PID and gain settings, taking the guesswork out

of system setup, reducing commissioning time and cost

while maximizing overall system performance (Patent: US

2009/0195224 A1).

• Avoid costly generator damage and improve overall system

stability with an optional integrated PSS that utilizes the “integral

of accelerating power” to safely dampen local mode, inter-area, and

inter-unit power oscillations.