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DECS-250-CN1CN1N Other Names:
Digital Excitation Control System DECS-250-CN1CN1N
DECS-250-CN1CN1N Excitation Controller Unit
Excitation Input/Output Unit DECS-250-CN1CN1N
Core Technical Specifications and Architecture
Voltage Regulation and Control: Employs true RMS measurement technology, achieving a voltage regulation accuracy of 0.25%. Supports five modes: AVR (Automatic Voltage Regulator), FCR (Excitation Current Regulator), FVR (Excitation Voltage Regulator), Constant Reactive Power (VAR), and Constant Power Factor (PF), adapting to different operating requirements. Built-in PID control algorithm, supporting automatic tuning function, optimizing system response speed and stability.
Functional Positioning: A digital automatic excitation regulator specifically designed for synchronous generators, integrating high-precision voltage regulation, multi-mode control, comprehensive protection, and flexible communication functions, conforming to IEC 61508/61511 SIL3 safety level certification.
Voltage Regulation Accuracy: Up to 0.25% FSR, supporting true RMS measurement (single-phase/three-phase), power measurement accuracy 2%, frequency measurement range 45-65Hz, resolution 0.01Hz.
Control Modes: Supports five modes: AVR (Automatic Voltage Regulator), FCR (Excitation Current Regulator), FVR (Excitation Voltage Regulator), Constant Reactive Power (VAR), and Constant Power Factor (PF), adapting to different operating requirements.
Protection Mechanisms: Built-in over-excitation limit (with temperature compensation), under-excitation limit, stator current limit, reactive power limit, low frequency/V/Hz limit, etc., with exciter diode monitoring (EDM) function.
Communication Interfaces: Equipped with USB, RS-232, RS-485, CAN bus, and Ethernet interfaces, supporting Modbus RTU/TCP protocols, with optional Profibus and J1939 CAN bus expansion, compatible with industrial automation networks.
Expansion Capabilities: Increase I/O points through CEM-2020 (digital expansion) and AEM-2020 (analog expansion) modules, supporting 4-20mA or ±10Vdc analog input.
Physical Parameters: Dimensions 159mm × 304.8mm × 219mm, weight 6.62kg, operating temperature -40°C to +60°C, protection rating IP20 (IP54 optional), compliant with CE, UL, CSA, and other international certifications.
Application Scenarios and Industry Adaptability
Power Generation Scenarios: Widely used in hydropower, thermal power, gas turbine, and other power generation scenarios, precisely regulating generator output voltage to ensure grid stability. For example, after adopting the DECS-250, a hydropower station reduced its voltage fluctuation range from ±2% to ±0.5%, and its power factor stabilized above 0.95.
Self-owned Power Plants: Used in self-owned power plants in industries such as mining, chemical, and metallurgy, it enables reactive power distribution when multiple generators are operating in parallel, reducing reactive power fluctuations by 40% and minimizing line losses.
New Energy Grid Connection: In wind and solar power plants, it works in conjunction with the PSS (Power System Stabilizer) function to suppress low-frequency oscillations and improve grid connection stability. After a wind farm was connected, the subsynchronous oscillation frequency decreased from 8Hz to 2Hz, with an amplitude attenuation of 70%.
Special Scenarios: Suitable for long-distance monitoring scenarios such as oil and gas pipelines and new energy grid connection, supporting remote I/O expansion up to 12 kilometers and compatible with DCS/SIS system linkage.
High-Risk Scenarios: Suitable for scenarios such as nuclear power steam supply projects and oil and gas pipeline monitoring, it complies with IEC 61508/61511 SIL3 safety level certification and meets explosion-proof and CCC mandatory product certification requirements.
High-Risk Scenarios: Compatibility and Expansion Solutions
Module Compatibility: Supports collaboration with CEM-2020/AEM-2020 expansion modules, increasing input/output contacts to meet complex logic control needs.
System Integration: Compatible with GE RXi series, Mark VIe/VIeS Speedtronic systems, and TRICONEX modules, achieving distributed control and multi-protocol compatibility.
Communication Protocols: Supports Modbus TCP/IP, EtherNet/IP, PROFINET, and other protocols, adapting to the interface requirements of industrial Internet of Things (IoT) platforms.
Installation and Maintenance Requirements
Installation Specifications: Requires installation in a dedicated rack (e.g., Tricon 8008/8011), supports DIN rail or 19-inch rack mounting. The environment should avoid strong electromagnetic interference; grounding resistance ≤ 1.0Ω; heat dissipation space ≥ 50mm.
Maintenance Recommendations:
Regularly check for loose wiring terminals. Perform no-load testing and protection setting verification every 3-6 months.
Firmware upgrades and configuration management are performed via BESTCOMSPlus software, adhering to SIL3 level maintenance standards.
Fault Handling: LED status indicators combined with diagnostic software quickly locate cross-leg register faults (such as Register 0x79 test failure).
Environmental Adaptability: Withstands vibration (15G shock resistance), shock (5G vibration resistance), and corrosive environments, ensuring stable operation in extreme temperatures ranging from -40°C to +85°C.
Safety and Reliability Advantages
Safety Certifications: Complies with IEC 61508/61511 SIL3 safety level, has passed ATEX/NEPSI explosion-proof certification and China CCC mandatory product certification, suitable for high-risk scenarios such as nuclear power and oil and gas plants.
Diagnostic Capabilities: Built-in self-diagnostic function can detect CPU, memory, and bus faults, quickly locating problems via PASS/FAULT/ACTIVE indicators. Supports trend recording, waveform recording, and event sequence recording to assist in fault analysis.
Redundancy Design: Employing a triple modular redundancy (TMR) architecture, it supports hot-swapping and fault switching, ensuring that a single point of failure does not affect system operation.
Typical Application Cases
Nuclear Energy: In the Tianwan Nuclear Power Plant’s “Heqi-1” project, it achieves real-time monitoring and safety control of industrial steam supply, reducing carbon emissions by 700,000 tons annually.
Petrochemical Industry: In reactor monitoring at a refinery, 64-channel high-precision signal acquisition and the TMR architecture ensure that a single point of failure does not affect system operation, improving production safety.
Summary: The Basler Electric DECS-250-CN1CN1N digital excitation control system, with its high-precision regulation, multi-mode control, comprehensive protection, and flexible expansion capabilities, has become a core component in the power generation industry and high-risk scenarios. Its stringent international safety certifications and powerful diagnostic functions ensure stable operation and rapid fault response in industries such as petrochemicals, power, and nuclear energy, making it the preferred solution for building modern industrial control systems.
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The Basler Electric DECS-250-CN1CN1N digital excitation control system features overexcitation limiting (with temperature compensation), underexcitation limiting, stator current limiting, reactive power limiting, and low-frequency/V/Hz limiting. It supports rotating diode monitoring (EDM) and fault recording. It supports 24Vdc, 48Vdc, or 120Vac/125Vdc; the power supply supports 56-277Vac (50-500Hz) or 125/250Vdc. With its high-precision control, multi-mode switching, comprehensive protection, and flexible communication capabilities, it has become a core component in power generation, self-owned power plants, and new energy grid-connected scenarios. Its stringent international safety certifications and modular design ensure stable operation and rapid fault response in harsh environments, making it a preferred solution for industrial safety.