Product overview

3.1 Purpose of the relay

The feeder protection relay REF610 is a multifunctional protection relay primarily used to protect incoming and outgoing lines in various feeder applications.

The relay is based on a microprocessor environment. A self-monitoring system continuously monitors the operation of the relay.

The human-machine interface includes a liquid crystal display (LCD) that makes local use of the relay safe and easy.

The relays can be controlled locally via serial communications from a computer connected to the front communication port.

Remote control is available through a serial communications bus connected to the rear connector of the control and monitoring system.

3.2. Features

* Three-phase non-directional overcurrent protection with timing or IDMT characteristics and low rectification phase.

* Three-phase non-directional overcurrent protection, high rectification phase

* Three-phase non-directional overcurrent protection, instantaneous stage

* Non-directional ground fault protection with timing or IDMT characteristics, low setting stage

* Non-directional ground-fault protection, high-calibration phase.

* Phase discontinuity protection

* Three-phase cable thermal overload protection

* Arc protection

* Two lens sensors for arc detection (optional)

* Automatic adjustment of reference level according to backlight intensity

* Arc detection by remote light signal

* Automatic reclosing 1…. .3 times

* Circuit breaker fault protection

* Trip counter for circuit breaker status monitoring

* Trip circuit monitoring with routing of warning signals to signal outputs

* Trip lockout function

* Four accurate current inputs

* User selectable rated frequency 50/60 Hz

* Three normally open power output contacts

* Two change-over signaling output contacts and three additional change-over signaling output contacts on optional I/O module

* Output contact functions can be freely configured according to requirements.

Feeder protection relays

Technical Reference Manual

REF610 1MRS755310* Two galvanically isolated digital inputs and three additional galvanically isolated digital inputs on the optional I/O module.

Two galvanically isolated digital inputs and three additional galvanically isolated digital inputs on optional I/O modules

* Interference logger:

* Recording time up to 80 seconds.

* Triggered by one or more internal or digital input signals

* Records four analog channels and up to eight user-selectable digital channels

* Adjustable sampling rate

* Non-volatile memory for

* Up to 100 time-stamped event codes

* Set values

* Interference logger data

* Time-stamped logging data for the last five events

* Number of AR shots and protection phase starts/trips

* Operating indication messages and LEDs showing status in case of power failure

* HMI with alphanumeric LCD and navigation buttons

* Eight programmable LEDs

* Multiple language support

* User-selectable password protection for the HMI

* Display of primary current value

* Demand value

* All settings can be modified via PC

* Optical front communication connection: wireless or cable

* Optional rear communication module with plastic fiber optic, combined fiber optic (plastic and glass) or RS-4 connection.

(Optional rear communication module with plastic fiber optics, combined fiber optics (plastic and glass) or RS-485 connection for use with the

SPA bus, IEC 60870-5-103. or Modbus (RTU and ASCII) communication protocols for system communication.

* Optional DNP 3.0 rear communication module with RS-485 connection for system communication using DNP 3.0 communication protocols

* Battery backup for real-time clock

* Battery charge monitoring

* Continuous self-monitoring of electronics and software

* Removable plug-in unit

4. Applications

The REF610 is a multifunctional relay designed primarily for the protection of incoming and outgoing lines in medium voltage distribution substations.

In industrial and utility applications, the relay can also be used as backup protection for motors, transformers and generators.

The relay incorporates a number of protection features including three levels of overcurrent protection, two levels of non-directional ground fault protection and thermal protection to provide comprehensive overcurrent and ground fault protection.www.abb-drive.com

An optional arc protection function can be used to detect arcing conditions in air-insulated metal-clad switchgear, and an automatic reclosing function can be used to automatically clear overhead line faults.

These features further expand the range of applications for the relays.

The large number of digital input and output contacts allows a wide range of applications.

4.1. Requirements

To ensure correct and safe operation of the relays, it is recommended that preventive maintenance be carried out every five years on relays operating under specified conditions;

See table 4.1.-1 and section 5.2.4. Technical Data.

When used for real-time clock or logging data functions, the batteries should be replaced every five years.

4.2. Configuration

By appropriately configuring the output contact matrix, signals from the protection level can be used as contact functions. The start signals can be used for

for blocking cooperating relays and for signaling.

The following figure shows the default configuration of the relay: all trip signals are routed to trip the circuit breaker.

In the first example in Figure 4.2.-1. the residual current is measured by the iron core balancing current transformer and the output contacts are connected to enable the automatic reclosing function.

In the second example in Figure 4.2.-2. the residual current is measured through the trimming connection of the phase current transformer and the output contacts are connected to enable the trip lockout function with an external reset switch.