The ABB REF542plus 1VFC752000 base unit is a sophisticated protection, control, and monitoring device designed for medium-voltage distribution systems. Below are its key technical parameters and features:

1. Core Functions

• Protection: Offers comprehensive protection functions including overcurrent (instantaneous, definite-time, inverse-time), earth fault (sensitive and directional), overvoltage/undervoltage, overfrequency/underfrequency, and breaker failure protection.
• Control: Supports local/remote operation of circuit breakers and disconnectors, enhancing system flexibility.
• Monitoring: Continuously monitors electrical parameters such as current, voltage, active/reactive power, power factor, and frequency.
• Communication: Equipped with standard RS485 (Modbus RTU or IEC 60870-5-103) and optional Ethernet (IEC 61850, DNP3.0, Modbus TCP) interfaces for seamless integration with SCADA systems.

2. Technical Specifications

• Voltage Ratings:
  • Auxiliary power supply: 24/48/60 V DC or 110-240 V AC/DC (wide-range input).
  • Measurement voltage (PT input): 100 V or 110 V (line voltage) or 57.7 V (phase voltage).
• Current Ratings:
  • CT input: 1 A or 5 A (configurable).
• Frequency Range: 50/60 Hz (adaptive).
• Environmental:
  • Operating temperature: -25°C to +70°C.
  • Protection class: IP40 (front panel), IP20 (terminal area).
• Display & Interface:
  • HMI: LCD with keypad operation, supporting multi-language menus.
  • Logic programming: Supports CFC (Continuous Function Chart) for custom logic.

3. Advanced Features

• Fault Recording: Captures event logs and waveforms for detailed fault analysis.
• Modular Design: Allows configuration and expansion based on specific application requirements.
• Compliance: Meets international standards such as IEC 60255, IEC 62271, and UL.
• Application Scope: Suitable for medium-voltage distribution networks (6 kV to 36 kV), industrial power systems (motor/transformer protection), and renewable energy integration (wind/solar).

4. Applications

• Distribution Automation: Enhances efficiency and reliability through real-time monitoring and control of distribution systems.
• Power Quality Monitoring: Detects voltage fluctuations and harmonics to ensure high-quality power supply.
• Remote Monitoring: Enables remote status monitoring and operation, reducing the need for on-site interventions.

5. Installation & Maintenance

• Compact Design: Easy to install and maintain, with a panel-mounted form factor compliant with IEC 60255 standards.
• Redundancy Support: Optional redundant configurations for high availability in critical applications.