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Overview

RET615 is a dedicated transformer protection and control relay for power transformers,

unit and step-up transformers including power generator-transformer blocks in utility and

industry power distribution systems. RET615 is a member of ABB’s Relion® product

family and part of its 615 protection and control product series. 

The 615 series relays are characterized by their compactness and withdrawable-unit design.

Re-engineered from the ground up, the 615 series has been designed to unleash the full

potential of the IEC 61850 standard for communication and interoperability between

substation automation devices. Once the standard configuration relay has been given the

application-specific settings, it can directly be put into service.

The protection relay can support five simultaneous clients. 

If PCM600 reserves one client connection, only four client connections are left, for example, for IEC 61850 and Modbus.

All communication connectors, except for the front port connector, are placed on

integrated optional communication modules. 

The protection relay can be connected to Ethernet-based communication systems via the 

RJ-45 connector (100Base-TX) or the fiber optic LC connector (100Base-FX).

Protection functions

The protection relay offers integrated protection functions including two-stage 

overvoltage and undervoltage protection, two-stage residual overvoltage protection, 

as well as singlestage negative phase-sequence overvoltage protection and 

single-stage positive phase-sequence undervoltage protection.

Measurement

The protection relay physically measures the three phase-tophase voltages and the residual voltage of the power system.

Further, from the phase-to-phase voltages the protection relay

calculates the positive and negative phase-sequence voltages,

the one-minute average phase-to-phase voltage, the average

phase-to-phase voltage for a user-specifiable time frame, the

maximum value of the one-minute average voltage, and the

maximum and minimum phase-to-phase voltage value since last reset.

The values of the voltages measured or calculated can be

accessed locally via the user interface on the protection relay’s

front panel, or remotely via the serial communication interface

on the rear panel of the protection relay.

Disturbance recorder

The protection relay is provided with a built-in battery backedup 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 voltages 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.

Description

REU610 is a voltage protection relay for system voltage

protection, measuring and supervising in utility and industrial

power systems. REU610 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 designed for the overvoltage

protection of power system components, such as busbars,

feeders, power transformers and capacitor batteries. It is also

used for the general power system earth-fault supervision.

Further, the protection relay can be used for undervoltage

protection of motors and overvoltage protection of capacitor

batteries, for initialization of automatic busbar changeover and

disconnecting small power units from the network in case of a

major network disturbance. The 610 series protection relays

are suitable for employment in marine and offshore environments.

The numerical voltage 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.

Measurement

The relay continuously measures phase currents and earth current. Earth current can be

measured using external core balance current transformer or can be calculated internally.

The relay has provision to display measured three phase current and earth current in primary

and secondary terms. Additionally, relay displays status of binary input, binary output and trip

counter for over current and earth fault trip.

During service, the default view of display shows three phase current and the earth current in

secondary terms. The values measured can be accessed using on the local HMI.

Event log 

To collect sequence – of – events (SoE) information,

the relay incorporates a non-volatile memory with a capacity of storing 250 events

with associated time stamps with resolution of 1 ms.

Event log includes protection operation status, binary I/O status and relay fault code.

The event logs are stored sequentially,the most recent being first and so on.

The non-volatile memory retains its data also in case the relay temporarily loses its auxiliary supply.

The event log facilitates detailed post-fault analysis of feeder faults and disturbances.

The SoE information can be accessed locally via the user interface on the relay front panel.

Application

The REJ603 is a protection relay aimed at selective short-circuit and earth-fault protection

of feeders in secondary distribution networks and for protection of transformers in utilities and industries.

The inrush current stabilization function allows the relay to be used as main protection of

distribution transformers.

The relay is powered up through current transformer if current is above energizing level of

relay, front USB power or through auxiliary supply (optional feature).

The relay offers, non-directional over current and earth-fault protection. 

The residual current for the earth-fault protection is derived from the phase currents. 

When applicable,the corebalance current transformers can be used for measuring the residual current,

especially when sensitive earth-fault protection is required.

The relay additionally offers thermal overload protection for feeders, cables and transformers.

There is optional provision of remote trip through binary input with external auxiliary power supply.

The remote trip signals like transformer trouble output (Buchholz, Oil temperature,

Winding temperature trip) or an external trip can be wired

to binary input. The remote trip function works even in CT-powered mode when auxiliary supply

is not available but enough CT current is available to power-up the relay.

Protection functions

REJ603 offers three-stage overcurrent and twostage earth-fault protection functions.

The transformer inrush detector function is incorporated to prevent unwanted tripping’s due to energizing of transformers.

The low-set stages for overcurrent and earthfault protection are equipped with selectable characteristics – Definite time (DT) and Inverse

definite minimum time (IDMT).

The relay featuresstandard IDMT characteristics according IEC 60255-151. Normal Inverse (NI), Very Inverse (VI),

Extremely Inverse (EI), Long-time Inverse (LI) and IDMT characteristics as per ANSI C37.112 Moderate inverse,

Normal Inverse, Very inverse, Extremely inverse.

The relay also has special characteristics like RI, HR and FR fuse,which allows better co-ordination with the rest of the network.

Further relay offers thermal overload protection for feeder, cable and transformer.

Description

REJ603 is a self-powered feeder protection

relay, intended for the protection of utility substations and industrial power systems, in secondary

distribution networks. REJ603 is a member of ABB’s Relion® product family and part of its 605 series.

The feeder protection relay REJ603 is designed to be a part of Ring Main Units (RMU) and secondary distribution switchgears.

The REJ603 relay is a self-powered numerical relay, which receives power from the main current transformers.

This way REJ603 is an ideal choice for installations where an auxiliary supplies are not available and hence is suitable

for unmanned distribution substations having no auxiliary supplies.

Relay has add-on optional function of remote trip through binary input with selection of auxiliary power version.

Relay functions

The relay provides an optimized composition of protection and monitoring functionality in one unit,

with the best performance usability in its class and are based on ABB’s in-depth knowledge of protection and numerical technology.

REJ603 offers pre-configured functionality which facilitates easy and fast commissioning of switchgear.

To emphasize the simplicity of relay’s usage, only application specific parameters needs to set within the relay’s intended area of application.

The relay also has short power up time which ensures fast operation during switch on to fault.

Supervision

To ensure continuous availability of protection, self-supervision of the relay hardware and software is incorporated. The

REF601/REJ601 and REM601 also include an integrated trip-circuit monitoring function which monitors the external trip

signal path. A built-in test mode which enables users to test the relay HMI, protection functions, and binary outputs.

The 605 series relays can store 100 events with time stamps at a resolution of 1 ms.

They can also store analog fault records for the last five trip events.

This data is stored in non-volatile memory.

The optional communication card extends local monitoring and control facility of the HMI to remote automation systems over

MODBUS RTU / IEC 60870-5-103 protocol.

Sensor support

These relays support both conventional CTs and Rogowski current sensors.

The sensor option helps to obtain equipment size reduction, performance improvement and better standardization in compact MV switchgear.