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Basler Electric manufactures a complete line of precision voltage regulators, both digital and analog, that will improve and optimize generator system performance for any application. Whether it's prime power or emergency back-up power, Basler Electric has regulators for high performance and reliability. We offer regulators that are CSA certified and come standard with an 18-month warranty.
Digital Excitation Control System Family
DECS-100 — DECS-200— DECS-200N —DECS-300 — DECS-400
Digital Excitation Control System (DECS-100)
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This environmentally rugged digital excitation control system is ideally suited for controlling the output of brushless excited synchronous generators up to 5MW. The DECS-100 is extremely affordable and perfect for machines that will be paralleled to other generators and/or to the utility system. It is ideal for distributed generation, co-generation and peak shaving applications.
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Features include:
- 0.25% Voltage Regulation Accuracy
- 0.5% accuracy up to 40% THD (harmonics associated with 6 SCR load)
- 63Vdc @ 7Adc PWM output
- 0-3X V/Hz limiting
- Soft Start capability
- 20 standard stability selections and one customizable selection
- VAR/PF control (Optional selection)
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- Underexcitation Limiting (UEL)
- Overvoltage Time Delay
- Takeover Style Overexcitation Limiting (OEL) Characteristic
- Voltage Matching Features:
-Bus Voltage Matching Provisions
- Voltage Set Point Selections: Maintain Mode and Revert Mode
- Overexcitation limiting
- Manual Mode (Field current regulation)
- Paralleling input from 1 or 5A CT secondaries (Optional selection)
- Nominal sensing inputs of 120, 240, 480 and 600Vac
- Power Input from 50/60Hz shunt connections or PMGs operating at 50 to 400Hz
- Five generator protection functions including Loss of Sensing transfer to manual
- Alarm Contact Output
- Accessory input
- LED Annunciation of operating conditions
- Setup via PC via BESTCOMS software (included)
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The ICRM minimizes inrush currents on voltage regulators that incorporate Pulse Width Modulated (PWM) technology.
Download Bulletin SZN for more information or download the product manual.
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Digital Excitation Control System (DECS-200)
One DECS-200 Digital Excitation Control System can accommodate 32Vdc, 63Vdc, or 125Vdc applications up to 15Adc. This unique flexibility provides precision control of virtually any size generators. The DECS-200 also incorporates a pulse width modulated power stage, which improves system performances in non-linear load applications.
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Features include:
- True RMS sensing, single or three phase
- 32Vdc, 63Vdc, and 125Vdc outputs at 15Adc
- 0.25% Voltage Regulation Accuracy
- Setup from front panel HMI or by PC with Windows® setup software included
- 20 standard stability selections plus a user customizable stability selection
- Paralleling compensation
- Underfrequency compensation or V/Hz Ratio Limiter
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- Softstart buildup
- Field Current Regulation Mode (Manual Mode)
- Autotracking between operating modes standard and between DECS-200 units optional
- Remote setpoint control via:
- Contact inputs
- Proportional control via ±10Vdc or 4-20mA
- Communications inputs RS-232 (ASCII) or RS-485 (Modbus™)
- Minimum Excitation Limiter (Internally generated or customizable)
- On and off-line Maximum Excitation Limiters
- VAR and Power Factor Controllers
- Voltage Matching
- Seven generator protection features
- Programmable output contacts
- Front panel backlit LCD display and front panel mounted RS-232 and side RS-485 communications ports
- Exciter Diode Monitoring (EDM)
- Sequence of Event Recording (SER)
- Oscillography
- Modbus™ protocol for RS-485 input allows communications up to 4,000 feet away
- <1% metering accuracy for 12 generator parameters
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Read about the DECS-200 in action in these Application Notes:
- EX-D200P3 describes the DECS-200 pre-packaged retrofit solution for use on small to medium size synchronous machines with brush or brushless type rotating exciters.
- EX-D200SILV - the DECS-200 Kit designed to replaceWestinghouse Silverstat voltage regulators.
- EX-D200SRA - the DECS-200 Kit designed to replace the SR4A and SR8A voltage regulators, for generators ranging from 250 kW to 7 MVA.
- EX-D200VR - the DECS-200 Kit designed to replace Electric Machinery VR voltage regulators.
- EX-MAVR1 -Addresses the benefits of replacing the BRUSH model MAVR voltage regulator with a DECS-200.
The Remote Display Panel (RDP-300) provides remote control, metering, status and alarms for the DECS-200. The ICRM minimizes inrush currents on voltage regulators that incorporate Pulse Width Modulated (PWM) technology. Read more in Application Note RSC-ICRM.
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DECS-200N Negative Forcing Digital Excitation Control System
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The DECS-200N is a very compact Negative Forcing Digital Excitation Control System.
This multiple microprocessor-based design accommodates 63 Vdc and 125 Vdc applications up to 20 Adc continuously. The on-board six-thyristor controlled rectifier bridge offers the highest system performance possible, making the DECS-200N ideal for providing exceptional system response, which makes it suitable for applications requiring power system stabilizers. For more information on negative field forcing voltage regulators and power system stabilizers, see the technical paper "Suitability of Excitation Systems for PSS Applications" from the Power Engineering Society General Meeting, 2003
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| DECS-200N |
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Features
• True RMS sensing, single or three phase
• ±0.25% Voltage Regulation Accuracy
• 63 Vdc and 125 Vdc output capability up to 20 Adc continuous
• Negative field forcing
• High initial response
• Soft start buildup
• Var and Power Factor operating modes with Autotracking
• Autotracking between operating modes and between dual DECS-200Ns
• On and off-line Overexcitation Limiter
• Customizable Underexcitation Limiter
• Stator Current Limiting
• Underfrequency compensation or V/Hz Ratio Limiter
• Field flashing control provisions
• Paralleling provisions
• Generator Protection
• Exciter Diode Monitoring (EDM)
• Oscillography and Sequence of Events Recording
• Voltage Matching
• 5 Programmable output contacts
• Modbus™ protocol via RS-485 communications
• Setup via Windows®-based BESTCOMS software
Download Bulletin SZO for more information or download the product manual.
For a quick comparison of the DECS-200 and DECS-200N, download our Comparison Chart.
The negative field forcing capability of the DECS-200N offers tuning advantages for rotating exciter systems. See Application Note EX-D200N1 for details.
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Digital Excitation Control System (DECS-300)
The microprocessor-based DECS-300 provides precision control for generators of virtually any size and is equally suited for exciter field or main field applications. It provides control signals for pulse width modulated power modules and SCR bridges manufactured by Basler Electric and other manufacturers.
Four customer-selectable control modes:
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- Voltage Regulation
- Manual Control (Field Current Regulation) -
- VAR Control
- PF Control
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Other features include:
- Autotracking between operating modes within a single DECS-300 unit
- Autotracking between redundant DECS-300 units
- Autotransfer to a back-up DECS-300 unit
- True RMS sensing, single or three phase
- Controls the firing of external bridges by outputting 4-20mA, 0-10Vdc or ±10Vdc
- 0.25% Voltage Regulation Accuracy
- Setup from front panel HMI or by PC with free BESTCOMS Windows®-based setup software
- 40 standard stability selections
- User customizable stability selection
- Paralleling compensation from 1 or 5A CTs
- 0 to 3 times Volts per Hertz Underfrequency compensation
- Softstart buildup
- Remote setpoint control via:
- Contact inputs
- Proportional control via ±10Vdc, 0-10Vdc, or 4-20mA
- Communications inputs RS-232 (ASCII) or RS-485 (Modbus™)
- Minimum Excitation Limiter
- On and off-line Maximum Excitation Limiters
- CSA Certified, UL Recognized, and CE Compliant
Download Bulletin SZE for more information or download the product manual.
Application Notes on the DECS family are available.
The Remote Display Panel (RDP-300) provides remote control, metering, status and alarms for the DECS-300.
For details on the DECS-300 as part of a Static Exciter system, please download our full standard exciter specification.
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Digital Excitation Control System (DECS-400)
The DECS-400 is a microprocessor-based controller that provides excitation control, flexible logic control, and optional power system stabilization for synchronous machines in an integrated package. The controller provides an analog output to control the firing of external bridge(s) and monitors machine parameters to control, limit, and protect the synchronous machine from operating beyond its capability limitations.
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DECS-400 |
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The optional Power System Stabilizer is an IEEE-type PSS2A, dual input, "integral of accelerating power" stabilizer that provides supplementary damping for low-frequency local mode, inter area, and inter unit power system oscillations.
Other features include:
- Four Control Modes, with autotracking between modes
- Automatic Voltage Regulation (AVR)
- Field Current Regulation (FCR)
- Power Factor (PF)
- Var Control
- 0.20% Voltage Regulation Accuracy
- Two pre-position set points for each mode
- Two Programmable Analog Outputs
- Setup from Front Panel HMI or by PC
- 40 Standard Stability Settings
- Customizable Stability Setting with two PID setting groups
- Reactive Droop, Line Drop Compensation
- Voltage Soft-Start Buildup
- Real Time Metering for 19 Generator Parameters
- Voltage Matching
- Autotracking with Optional Backup DECS-400
- Flexible Remote Set point Control
- Contact inputs
- Proportional Analog input, ±10 Vdc or 4-20 mA
- Digital Communications
- Local RS-232, ASCII, Modem Capabilities
- RS-485, Modbus™
- Setup and initial operation are facilitated by BESTCOMS, which offers:
-real time monitoring test analysis
-flexible oscillography, trending
-expanded testing capabilities, including means for performing frequency response tests
- UL Recognized, CSA certified, CE Compliant
Download Bulletin SZF for more information or download the product manual.
For details on the DECS-400 as part of a Static Exciter system, please download our standard exciter specification. DECS-400 Application Notes also are available.
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