610 serie ABB Feeder Protection REF610 Product Guide

Description

REF610 is a feeder protection relay for protection, measuring and supervision of utility and industrial distribution power systems. REF610 is a member of ABB’s Relion® protection and control product family and part of its 610 product series. The 610 series includes protection relays for feeder protection, motor protection and general system voltage supervision. The plug-in design of the 610 series protection relays facilitates the commissioning of the switchgear and enables fast and safe insertion and withdrawal of relay plug-in units.

The protection relay is primarily targeted at the protection of incoming and outgoing feeders in distribution substations. REF610 is also used as back-up protection for motors, transformers and generators in utility and industry applications. Further, the 610 series protection relays are suitable for employment in marine and offshore environments.

The numerical feeder protection relays of the 610 series support a wide range of standard communication protocols, among them the IEC 61850, IEC 60870-5-103, DNP3, Modbus, Profibus, LON and SPA communication protocols.

Protection functions

The protection relay offers overcurrent and thermal overload protection, earth-fault and phase-discontinuity protection for cable feeders, and three-pole, multi-shot autoreclose functions for overhead-line feeders.

Enhanced with optional hardware, the protection relay also features two light detection channels enabling arc fault protection of the switchgear, busbar system and cable terminals.

The numerical feeder protection relays of the 610 series support a wide range of standard communication protocols, among them the IEC 61850, IEC 60870-5-103, Modbus, Profibus and DNP3 communication protocols.

The connection of the CTs to REF610 depends on the available number and types of CTs in the feeder cubicle. Generally an outgoing feeder is equipped with three phase current transformers for high- and low-set overcurrent protection. The residual current for the earth-fault protection can be derived from the three phase currents. It can also be measured with a ring-type cable current transformer, should the outgoing feeder be a cable line and a sensitive earth-fault protection be required. Should the feeder cubicle be equipped with two phase current transformers, REF610 can still be used for high- and low-set overcurrent protection including phase discontinuity and phase unbalance protection.

Measurement

The protection relay continuously measures the phase currents and the residual current. Further the protection relay calculates the thermal overload of the protected object, the phase unbalance value, the one-minute demand value, the demand value for a specified time frame and the maximum one-minute demand value over a specified time frame.

The values measured can be accessed locally via the user interface on the protection relay's front panel or remotely via the serial communication interface of the protection relay.

Disturbance recorder

The protection relay is provided with a built-in battery backed up digital disturbance recorder for four analog signal channels and eight digital signal channels. The analog channels can be set to record the curve form of the currents measured. The digital channels can be set to record external or internal relay signals, for example the start or trip signals of protection relay's stages, external blocking or control signals. Any digital relay signal such as a protection start or trip signal, or an external relay control signal can be set to trigger the recording. The recordings are stored in a nonvolatile memory from which the data can be uploaded for subsequent fault analysis.

Event recorder

To provide network control and monitoring systems with feeder level event logs, the protection relay incorporates a nonvolatile memory with capacity of storing 100 event codes including the time stamps.The nonvolatile memory retains its data also in case the protection relay temporarily loses its auxiliarysupply.The event log facilitates detailed pre- and post-fault analyses of feeder faults and distribution disturbances.

Circuit-breaker monitoring

The protection relay constantly monitors the tear and wear of the protected feeder's circuit breaker by using a set of built-in condition monitoring counters. The monitoring counters provide the circuit breaker with operational history data. This data can be used for scheduling preventive maintenance programs for the circuit breaker.

Trip-circuit supervision

The trip-circuit supervision continuously monitors the availability and operability of the trip circuit. It provides open circuit monitoring both when the circuit breaker is in its closed and in its open position. It also detects loss of circuit-breaker control voltage.

Self-supervision

The relay’s built-in self-supervision system continuously monitors the state of the relay hardware and the operation of the relay software. Any fault or malfunction detected is used for alerting the operator.

A permanent relay fault blocks the protection functions to prevent incorrect operation.