ABB REF543KM129AAAB Medium-Voltage Feeder Protection and Control Unit

• Current Input: Supports multiple current transformers (CTs) for accurate measurement of phase and ground currents.
• Analog Inputs: 12 channels for voltage and current inputs, with 2 additional virtual channels for zero-sequence current and residual voltage calculations.
• Switch Inputs: Voltage-controlled and optically isolated, ensuring reliable signal detection and isolation from the primary circuit.
• Switch Outputs: Multiple relay outputs for controlling circuit breakers, isolators, and other switching devices.
• Communication Interfaces: Supports protocols such as IEC 60870-5-103, Modbus, DNP3, and can be adapted for IEC 61850, enabling seamless integration into substation automation systems.
• Display: Large graphical LCD for local monitoring and configuration, with the option to separate the display from the main unit for flexible installation.
• Environmental Tolerance: Designed to operate in harsh industrial environments with a wide temperature range and high resistance to vibration and electromagnetic interference.

Functional Characteristics

• Comprehensive Protection Functions:
  • Phase overcurrent protection (with or without direction)
  • Earth fault protection (sensitive to low-level faults)
  • Zero-sequence overvoltage protection
  • Overvoltage and undervoltage protection
  • Thermal overload protection for motors and feeders
  • Breaker failure protection
  • Auto-reclosing functionality for temporary faults
• Advanced Control Features:
  • Local and remote control of circuit breakers and isolators
  • Synchronous checking for parallel operation
  • Control object status display for operator awareness
• Precise Measurement Capabilities:
  • Measures phase currents, line and phase voltages, zero-sequence currents and voltages
  • Calculates frequency, power factor, active and reactive power, and energy consumption
• Extensive Monitoring Functions:
  • Monitors breaker status, trip circuit status, and fuse health
  • Performs internal self-tests to ensure device integrity
  • Logs events and disturbances for post-fault analysis
• Programmable Logic Control (PLC):
  • Offers extensive PLC capabilities for integrating automation and sequential logic control functions
  • Supports custom logic programming to meet specific application requirements
• Fault Recording and Analysis:
  • Equipped with a fault recorder capable of capturing 16 current or voltage waveforms and 16 logic switch signals
  • Adjustable recording length based on the number of analog inputs

Application Scenarios

• Power Distribution Systems:
  • Used in medium-voltage feeder circuits for protection, control, and monitoring
  • Suitable for distribution switchgear in single-bus, double-bus, and double-switch configurations
• Industrial Automation:
  • Applied in manufacturing, petrochemical, and metallurgical industries where reliable power distribution is critical
  • Protects motors, feeders, and other electrical equipment from fault conditions
• Utility Networks:
  • Integral part of substation automation systems for utilities
  • Facilitates seamless communication and coordination between different components
• Renewable Energy Integration:
  • Supports the integration of renewable energy sources (e.g., wind, solar) into the grid
  • Ensures stable operation and protection of distributed generation assets
• Motor Protection and Control:
  • Protects medium-sized three-phase asynchronous motors from overcurrent, thermal overload, and other faults
  • Enables efficient control and monitoring of motor operations
• Capacitor Bank Control:
  • Controls and protects reactive power compensation shunt capacitor banks
  • Enhances power quality and system efficiency by managing reactive power flow