Basler DECS-250-LN1SN1N All-Digital Excitation Controller

Product Description

Basler DECS-250-LN1SN1N is a fully digital excitation controller (digital AVR) of the DECS-250 series for synchronous generators. Code explanation: L = 16–60 VDC control supply; N1 = without built-in PSS power system stabilizer; S = spring terminals; N1 = base I/O configuration; N = no special coating. It supports AVR voltage regulation, FCR field current regulation, power factor and Var control for generator paralleling and reactive load sharing. Integrated generator protection, COMTRADE oscillography, SOE and trending are available. It supports RS485 Modbus RTU and Ethernet Modbus TCP, configured via Basler BESTCOMSPlus software. It is widely deployed in hydro, thermal and captive power plants.

Specifications

• Model: DECS-250-LN1SN1N
• Brand: Basler Electric
• Type: Digital Excitation Control System / Digital AVR
• Control Supply: 16–60 VDC (L option)
• Feature Set: N1 (No PSS), spring terminals, base I/O
• Control Modes: AVR, FCR, Power Factor, Var control
• Sensing: 3-phase true RMS PT/CT measurement
• Excitation Output: PWM firing pulses for thyristor rectifier
• Communication: RS485 Modbus RTU, Ethernet Modbus TCP
• Data Recording: COMTRADE fault oscillography, SOE, trending
• Protection Elements: Overvoltage, undervoltage, over/under frequency, loss of excitation, V/Hz overexcitation, overexcitation limiter UEL
• Configuration Tool: Basler BESTCOMSPlus
• Mounting: Panel flush mount
• Operating Temperature: -20℃ ~ +60℃
• Storage Temperature: -40℃ ~ +85℃
• Enclosure Rating: Front IP52, internal IP20
• Certifications: UL, cUL, CE

Application

1. Excitation control and reactive power regulation for hydro generators
2. Synchronous generators for thermal and gas turbine captive power plants
3. Generator voltage regulation for petrochemical, coal chemical and steel captive stations
4. Excitation retrofits for standby diesel generator sets
5. Spare replacement and upgrade of legacy excitation systems
6. Paralleling and reactive load sharing for small & medium power plants

Series Models

DECS-250-LN1SN1N, DECS-250-LN2SN1N (with PSS), DECS-250-CN1SN1N (AC supply variant)