ABB REF615E_1G H-B-F-N-AE-AG-A-N-B-1-A-N-A-1-1G Feeder Protection and Control Relay

Technical Specifications

• Voltage Input: Configurable for a wide range of medium-voltage network configurations, supporting both line-to-line and line-to-neutral voltage measurements.
• Current Input: Equipped with multiple current transformers (CTs) for accurate measurement of phase and ground currents, with support for both 1 A and 5 A current ranges.
• Measurement Accuracy: High-precision measurement capabilities with ±0.5% accuracy for current and voltage measurements, ensuring reliable data for system monitoring and analysis.
• Communication Interfaces: Supports multiple communication protocols, including IEC 61850 (Editions 1 and 2), Modbus TCP/RTU, DNP3, IEC 60870-5-103, and PROFIBUS DPV1 (via protocol adapter). It also supports IEEE 1588 V2 for high-accuracy time synchronization, enabling seamless integration into modern substation automation systems.
• Power Supply: Operates on a wide range of DC power supplies (24/48/110/220 VDC), with low power consumption for energy efficiency and reduced operational costs.
• Display: Features a large, high-contrast graphical LCD display for local monitoring and configuration, with the option to separate the display from the main unit for flexible installation in control panels.
• Environmental Tolerance: Designed to withstand harsh industrial environments with a wide operating temperature range (-25°C to +70°C) and high resistance to vibration, shock, and electromagnetic interference (EMI).

Functional Characteristics

• Comprehensive Protection Functions:
  • Overcurrent Protection: Provides three-phase overcurrent protection with adjustable time-current characteristics, including definite time and inverse definite minimum time (IDMT) curves, to safeguard feeders from excessive current flow.
  • Earth Fault Protection: Offers directional and non-directional earth fault protection with high sensitivity and selectivity, including multi-frequency admittance-based protection for improved fault detection in complex network configurations.
  • Thermal Overload Protection: Monitors the thermal state of the protected equipment using a dynamic thermal model, preventing damage due to prolonged overcurrent conditions and extending equipment lifespan.
  • Voltage and Frequency Protection: Includes undervoltage, overvoltage, underfrequency, and overfrequency protection to safeguard equipment from voltage and frequency abnormalities, ensuring stable operation under varying load conditions.
  • Phase Imbalance Protection: Detects and responds to unbalanced load conditions, preventing equipment damage and reducing energy losses due to imbalance.
  • Breaker Failure Protection: Initiates backup protection actions in case of circuit breaker malfunction, ensuring reliable operation and minimizing downtime.
• Advanced Control Features:
  • Local and Remote Control: Enables local control via the device panel and remote control through a backend monitoring system (SCADA), supporting both manual and automatic operations for flexible system management.
  • Auto-Reclosing: Supports configurable auto-reclosing functionality with adjustable reclosing times and attempts, facilitating automatic clearance of temporary faults and improving system reliability.
  • Synchronization Check: Performs synchronization checks for parallel operation of circuit breakers, ensuring safe and coordinated switching operations in multi-breaker configurations.
• Precise Measurement Capabilities:
  • Measures phase currents, line and phase voltages, zero-sequence currents and voltages, frequency, power factor, active and reactive power, and energy consumption with high accuracy.
  • Provides real-time data for system monitoring and analysis, enabling proactive maintenance and optimization of power system performance.
• Extensive Monitoring Functions:
  • Monitors breaker status, trip circuit status, and fuse health to ensure system integrity and detect potential issues before they escalate.
  • Performs internal self-tests to detect and report any device malfunctions, reducing downtime and maintenance costs through early fault detection.
  • Logs events and faults with timestamps for post-analysis and fault diagnosis, facilitating troubleshooting and improving system reliability.
• Event Recording and Analysis:
  • Equipped with a high-capacity event recorder capable of capturing detailed waveform data for fault analysis, supporting triggered recording based on internal or external events with adjustable recording length and sampling rates.
  • Enables comprehensive fault analysis and system optimization through detailed event logs and waveform data.
• Programmable Logic Control (PLC):
  • Offers extensive PLC capabilities for integrating automation and sequential logic control functions into the relay, reducing the need for additional control devices and simplifying system architecture.
  • Supports custom logic programming using a user-friendly interface, enabling tailored solutions for specific applications and enhancing system flexibility.

Application Scenarios

• Utility Distribution Networks:
  • Used in medium-voltage feeder circuits for protection against overcurrent, earth faults, and other abnormal conditions, ensuring reliable power supply to residential and commercial areas.
  • Suitable for distribution switchgear in single-bus, double-bus, and ring main unit configurations, supporting the modernization of utility distribution networks.
• Industrial Power Systems:
  • Protects medium-sized and large three-phase asynchronous motors from overcurrent, thermal overload, and other faults, ensuring safe and reliable operation in manufacturing, petrochemical, and metallurgical industries.
  • Monitors and controls industrial processes, optimizing energy usage and reducing operational costs through precise measurement and advanced control functions.
• Renewable Energy Integration:
  • Supports the integration of renewable energy sources (e.g., wind, solar) into the grid, ensuring stable operation and protection of distributed generation assets in microgrids and hybrid power systems.
  • Facilitates grid-connected and off-grid applications, enhancing energy efficiency and sustainability through advanced protection and control functions.
• Critical Infrastructure Protection:
  • Used in critical infrastructure sectors such as transportation, water treatment, and healthcare, where reliable power supply is essential for safety and operational continuity.
  • Provides comprehensive protection and monitoring functions to ensure uninterrupted operation and minimize downtime in mission-critical applications.
• Substation Automation:
  • Integral part of substation automation systems for utilities, facilitating seamless communication and coordination between different components through support for multiple communication protocols.
  • Enables remote monitoring and control of substation equipment, improving operational efficiency and reducing maintenance costs through centralized management.
• Data Centers and Commercial Buildings:
  • Ensures reliable power supply to data centers and commercial buildings by protecting feeders from overcurrent and earth faults, preventing costly downtime and data loss.
  • Monitors energy consumption and power quality, optimizing energy usage and reducing operational costs through precise measurement and advanced monitoring functions.