ABB REF620 IEC Feeder Protection and Measurement Control Unit

Relay protection for overhead lines and cable feeders in distribution networks for different application areas

Feeder protection, precisely the protection of overhead lines and cables, is the most commonly used type of protection.

The protection must ensure that the grid continues to supply power. In the event of a fault, it must be prevented from propagating to the normal part of the network.

Relay protection must also minimise damage to cables and other connected equipment from faults and ensure the safety of everyone involved.

ABB offers a wide range of feeder protection. There is a wide range of multifunctional relays for different application areas.

There are some for general feeder protection (overcurrent protection) and backup protection, and some more specialised ones, e.g. for line differential protection.

Main advantages

• Devices can be used for a wide range of applications
  

• Ranging from simple protection devices as back-up protection to specialised protection devices
  

• Well-established and modern technology
  

• Arc detection as an option
  

REF620 as a specialised feeder protection device for the protection, control, measurement and monitoring of public and industrial power distribution systems

REF620 IEC feeder protection and measurement and control device, as a dedicated feeder protection device, is specially designed for the protection, control, measurement and monitoring of public and industrial grids, including radial, ring and mesh grids.

The REF620 provides feeder overcurrent and earth fault protection that can be applied to both ungrounded neutral networks and resistance or impedance neutral grounded networks.

In addition, the REF620 can also be used for ring mesh distribution or radial network protection, utilising the unit's advanced inter-station communication capabilities.

The REF620 IEC Feeder Protection and Measurement Control Unit is available in single and dual busbar configurations, with one or two circuit breakers and multiple switchgear configurations for each busbar configuration.

The unit supports a large number of manual and motorised disconnect and earth switches. The number of available I/Os can be increased as required by ABB's RIO600 remote I/O unit.

The REF620 IEC Feeder Protection and Control Unit features support for the IEC61850 communication standard for substations, covering both vertical and horizontal communications.

It includes GOOSE telegrams with switching and analogue signals and constant value adjustment based on IEC 61850-8-1.

The REF620 also supports DNP3, IEC 60870-5-103 and Modbus® protocols.

The REF620 provides an optional Ethernet port for non-delayed redundant Ethernet or a ring self-healing RSTP communication in the event of a communication failure via PRP or HSR protocols.

This solution eliminates the effects of a single point of failure and improves communication reliability. The solution can be applied to Ethernet based IEC 61850, Modbus® and DNP3 protocols.

The REF620 is a member of the 620 Protection, Measurement and Control product family within the ABB Relion® product family.

Key benefits

• Protection, control, monitoring and management integrated in a single relay provides a compact and versatile solution for public and industrial power distribution systems
  

• Wide range of protection and control functions, either with sensors or conventional CTs and PTs
  

• Functional scalability and wide range of applications allow users to easily customise configuration applications to meet specific requirements
  

• Pluggable design for quick installation and testing
  

• Large LCD screen with single-line graphic display, accessible locally or via an easy-to-connect and navigate HMI
  

• Thoughtful product lifecycle service
  

Key Features

• Wide range of protection and control functions for incoming or outgoing applications
  

• Multi-frequency conductive earth protection package with high sensitivity and selectivity
  

• Advanced and fast short-circuit and earth-fault location functions
  

• Several optional function packages - for distributed generation, capacitors, basic motor and arc-light protection
  

• Supports IEC61850 Version 1 and 2, including redundant HSR and PRP, GOOSE and IEC61850-9-2
  

• Supports Modbus, DNP3, IEC 60870-5-103 communication protocols and different time synchronisation methods, including IEEE 1588 v2 precision time protocols