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HJ-DEX is a HIR (High Initial Response) digital excitation system designed to offer high reliability, low maintenance costs, enhanced function and user-friendly access.

This digital excitation system has many more features than the previous analog models, and is widely used in industrial plants
 
- Standard
  • IEEE 421
• IEEE 421A
• ANSI/IEEE C37.18
• ANSI C50.10
• ANSI C50.13
• ANSI C50.14
• IEEE C37.18
• IEEE C57.12.00
• IEEE C57.12.19
 
- Application and Characteristics
  • Direct Power Supply for Electromagnetic Generators
• Terminal Voltage or Reactive Power Control
• Main Control/Protection
  - AVR (Automatic Voltage Regulator)
  - MVR (Manual Voltage Regulator)
  - UEL (Under Excitation Limiter)
  - OEL (Over Excitation Limiter)
  - TMR (Triple Modular Redundancy)
  - N+1 Redundant Rectifier System
  - RCC/ARCC (Automatic Reactive Current Compensator)
 
- Application and Characteristics
  • HIR (High Initial Response) Excitation Control System
• Negative Forcing Function
• Nominal Response: 2.0 p.u
• HIR (High Initial Response)
• TMR (Triple Modular Redundancy) Control System
• N+1 Redundant Rectifier System
 
- Others
  • Development of Control Program by Modularizing Per Task Using RTOS
  (Real Time Operating System)
• High Reliability and Controllability Based on TMR and N+1 Redundant Design
  Concept