DECS-400 DECS-400数字励磁控制系统

Product Description

The DECS-400 Digital Excitation Control System 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 DC output of an external rectifier bridge and monitors machine parameters to control, limit, and protect the synchronous machine from operating beyond its capability limitations.
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.
Setup and initial operation are facilitated by Basler Electric’s user-friendly BESTCOMS PC software that incorporates real time monitoring test analysis, flexible oscillography, trending, and expanded testing capabilities, including means for performing frequency response tests with a graphic display of results. This replaces the need for an external Dynamic System Analyzer.

• Microprocessor-based design
• 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

• Built-in limiting functions
– Overexcitation Limiters – Summing Point or Takeover Type
– Underexcitation Limiters – 5 point user programmable or internally generated, summing point or takeover
– Dual Slope Voltz/Hz Ratio or Underfrequency Limiter
– Stator Current Limiter (single phase or three phase)
• Built-in Protective Functions
– Field Overvoltage and Overcurrent
– Generator Undervoltage and Overvoltage
– Loss of Sensing Voltage
– Loss of Field (40Q)
– Field Overtemperature (for main field)
– Dual Slope Volts/Hertz (24)
– Exciter Diode Failure (for brushless exciters)
– Generator Frequency less than 10 Hz
• Optional Integral Power System Stabilizer
– Dual input, integral of accelerating power (IEEE PSS2A)
– Customer selectable speed-only sensing
– Two wattmeter power measurement
– Optional Frequency Based Operation
– Generator or Motor control modes
• IRIG Time synchronization
• Sixteen Contact inputs – 10 user-programmable
• Eight Contact Outputs – 6 user-programmable
• Metering – Two 4-20mA meter drivers, customer programmable
• Four Communication Ports
• Data Logging, Sequence of Events Recording, Trending, real time monitoring test analysis, and built-in frequency response test capabilities
• UL Recognized, CSA certified, CE Compliant, GOST-R certified
#POCC US.ME05.B03393