Brand: Basler Electric (USA)
Full name: DECS-250 Digital Excitation Control System
Position: Full-function digital excitation regulator for synchronous generators/synchronous motors, mainstream AVR for industrial steam turbines, gas turbines, biogas/diesel generator sets; often used in combination with Woodward PEAK200 and GE Mark VIe (turbine speed controller + excitation regulator combination)
I. Model Distinction (Order Suffix Meaning)
DECS-250: Standard model, 15A continuous PWM excitation output; short-term strong excitation 30A / 10s
DECS-250N: With negative excitation forcing (Negative Forcing), preferred for grid connection, rapid magnetization shutdown, and scenarios requiring PSS
DECS-250E: High-power expansion model (50A/100A/200A output)
DECS-250 CGCM: Specifically replaces AB 1407-CGCM, compatible with Rockwell ControlLogix system
Complete Order Example: DECS-250-LN2SN1N
LN2 = 24VDC control power supply; S = basic protection; N1 = Ethernet ModbusTCP; N = without PSS (can add PSS option)
Five Operating Regulation Modes (Non-disruptive Switching)
AVR terminal voltage regulation (common main mode)
Islanding / Grid connection universal, stabilizing generator terminal voltage; supporting soft rise in voltage, external 4–20mA remote control, contact rise and drop voltage control
VAR reactive power constant control
Grid-connected unit locking reactive power output
PF power factor constant control
Power plant grid operation standard mode
FCR excitation current constant current (manual backup)
PT open circuit, maintenance backup mode
FVR excitation voltage constant voltage
Testing, simulation conditions use
Core Hardware Specifications
Excitation power level: PWM DC output, continuous 15A DC; optional 32Vdc / 63Vdc / 125Vdc excitation voltage levels
Sampling: Single-phase / three-phase true RMS PT/CT sampling, tolerant to nonlinear load distorted waveforms
I/O resources
16 programmable dry contacts DI
12 programmable relay outputs (11×FormA + 1 watchdog Form-C)
Multiple 4–20mA / ±10V analog input/output
Power supply source: PMG permanent magnet machine, stator auxiliary winding, external DC power supply
Operation interface: front LCD display + navigation keys;配套上位软件 BESTCOMSPlus (parameter setting， recording， logic programming BESTlogicPlus)
Built-in Limitations and Protection Functions (Generator Comprehensive Protection)
Vibration-Hertz limit (preventing core overheating)
Over-excitation limit， under-excitation limit (loss of excitation protection 40Q)
Stator current limit， reactive power limit
Overvoltage 59 / low voltage 27， overfrequency / low frequency 81O/U
Reverse reactive power， rotating diode monitoring EDM (for brushless generators)
PMG power failure monitoring， excitation short circuit protection， synchronization check 25
Event recording， fault recording， SOE sequence
There are no reviews yet.