Relays provide robust motor protection

An ABB Automation Tech (LV Products) product story

Edited by the Engineeringtalk editorial team Jul 11, 2005

ABB has expanded its range of electrical relays with the addition of a new multifunction protection device for medium and large standard MV asynchronous motors.

ABB has expanded its range of electrical relays with the addition of a new multifunction protection device for medium and large standard MV asynchronous motors.

Designed primarily for motor applications ranging from 500kW to 2MW, the REM610 motor protection relay features a range of integrated functions for protection against motor damage.

Part of ABB's new R600 relay series, which also includes the REF610 feeder protection relay, the REM610 handles fault conditions during motor startup, normal operation, idling and cooling down at standstill, for example, in pump, fan, mill or crusher applications.

The REM610 is suitable for use in both circuit-breaker and contactor controlled drives.

With single-, two- and three-stage overcurrent and earth fault protection functions, as well as thermal overload protection, it is also ideal for feeder cable and power transformer applications.

The REM610 comes with a built-in disturbance recorder that records instantaneous values or RMS values of measured signals via four analogue channels and up to eight user-selectable digital channels.

With its nonvolatile memory, the REM610 records fault data and reports it, even after auxiliary power failure.

This, combined with a long mean time between failure (MTBF), enables the REM610 to offer high availability.

Three fixed and eight programmable LEDs enable fast fault indication and location.

A new interface on the REM610, featuring pushbuttons and an LCD, makes it easy for users to select and view data in seven languages, ranging from details of recorded faults through to current and temperature measurements and historical data.

A user-friendly graphical configuration tool also allows users to set up application-specific configurations.

Users can program the relay by using the pushbuttons on the front of the unit, via serial communication with a computer connected to the communication port, or remotely through a control or monitoring system connected through the unit's serial communication bus.

The REM610 features a range of communication options, including SPA-bus slave, Modbus and IEC60870-5-103.

It can also communicate wirelessly with a laptop computer if required.

The REM610's compact size and small mounting depth makes it ideal for retrofits and confined space installations.

Its withdrawable "plug and play" cassette design, makes it simple to fit and remove, helping to greatly reduce the amount of downtime required for installation, testing and maintenance.

Based on two separate units, this design automatically closes off the current transformer when the unit is removed, enabling work to be carried out safely without shutting off the supply.

Optional mounting kits for 19in racks, as well as for semiflush mounting with raising and 45-degree tilted raising frames also offers a choice of installation arrangements.