ABB REU615 Feeder Protection and Control Relay

Key Features and Functional Highlights

• IEC 61850 Edition 2 Compliance: Natively supports IEC 61850 for seamless integration into digital substations, including GOOSE messaging for fast peer-to-peer communication and Sampled Values (SV) for process bus applications.
• High-Availability Network Protocols: Implements HSR (High-availability Seamless Redundancy) and PRP (Parallel Redundancy Protocol) to ensure zero-time recovery and zero-packet loss in case of network link or switch failures.
• Advanced Metering and Quality Analysis: Provides high-precision measurement of electrical parameters including voltage, current, power, energy, and frequency. It also monitors power quality aspects such as harmonics and unbalance.
• Flexible Logic and Control: Features a powerful internal logic engine allowing users to create custom schemes using timers, latches, and arithmetic blocks. This enables complex interlocking and automation sequences without external wiring.
• User-Friendly Human-Machine Interface (HMI): Equipped with a high-resolution graphical display that shows single-line diagrams, oscillographic records, and event logs. The interface supports multiple languages and can be accessed via a front panel or remotely through a web server.
• Comprehensive Self-Supervision: Continuously monitors the health of the relay, including internal circuitry, memory, watchdog functions, and communication channels. It also supervises external circuits like trip coils and CT integrity.
• Disturbance Recording: Capable of capturing fault records and oscillography (pre-fault and post-fault data) which can be retrieved via the front port or communication network for root cause analysis.

Protection and Control Functions

The REU615 offers a wide range of configurable protection functions, typically categorized as follows:

• Phase and Earth Fault Protection:
  • Overcurrent Protection (ANSI 50/51): Instantaneous and time-delayed protection for phase and ground faults.
  • Directional Overcurrent (ANSI 67): For ring main units or meshed networks where fault direction matters.
  • Sensitive Earth Fault (ANSI 50N/51N): High-sensitivity detection of ground faults using residual current or core balance CTs.
• Voltage and Frequency Protection:
  • Undervoltage/Overvoltage (ANSI 27/59): Protection against voltage sags, swells, or loss of voltage.
  • Underfrequency/Overfrequency (ANSI 81): Load shedding or generator protection based on frequency deviation.
• Feeder Specific Functions:
  • Cold Load Pickup: Logic to handle the high inrush current when energizing a feeder after a prolonged outage.
  • Breaker Failure Protection (ANSI 50BF): Initiates backup tripping if the main breaker fails to interrupt a fault.
  • Auto-Reclosing (ANSI 79): Configurable dead-time and live-line check for overhead lines.
• Control Functions:
  • Circuit breaker control (Close/Trip/Spring charge).
  • Load shedding (Under-frequency or Under-voltage based).
  • Interlocking logic for switchgear.

Technical Specifications

• Product Family: Relion® 600 Series
• Application: Medium Voltage Feeders (11kV to 36kV typical)
• Communication Ports:
  • Station Bus: 2 x 10/100/1000 Mbps Ethernet ports (RJ45 or Fiber).
  • Process Bus: Support for IEC 61850-9-2 LE (optional via expansion).
  • Legacy Protocols: Modbus TCP/RTU, DNP3, IEC 60870-5-103.
• Inputs and Outputs:
  • Analog Inputs: 3 Phase Currents (1A or 5A nominal), Residual Current, 3 Phase Voltages (110V/115V or 100V/100V nominal), optional auxiliary voltage inputs.
  • Digital Inputs: Typically 8 to 12 configurable binary inputs (24V DC/AC or 110V/220V DC).
  • Digital Outputs: Typically 4 to 6 relay outputs (Form C contacts) plus internal logic signals.
• Power Supply: Universal supply range, typically 24V to 250V DC or 110V to 240V AC.
• Accuracy: Measurement accuracy Class 0.2 or 0.5 according to IEC 60688.
• Environmental Standards:
  • Operating Temperature: -40°C to +70°C (depending on configuration).
  • Insulation Class: Class I or II.
  • EMC Compliance: IEC 61000-4 series (Surge, ESD, Burst).
• Mounting: Withdrawable unit for easy maintenance in standard switchgear cubicles.

Application Scenarios

The ABB REU615 is utilized across various industries where reliable feeder protection is critical:

• Industrial Power Distribution: Protecting incoming and outgoing feeders in manufacturing plants, chemical facilities, and paper mills.
• Utility Substations: Used in secondary distribution networks for radial and ring-main feeder protection.
• Renewable Energy: Protection of collector systems in wind farms and solar parks, as well as the interconnection feeders to the grid.
• Infrastructure and Buildings: Medium voltage switchgear in commercial complexes, airports, and data centers.
• Mining and Metals: Heavy-duty feeder protection for crushers, mills, and processing plants operating at medium voltage.
• Railway Traction: Protection of feeders in electric railway traction power supply systems.