ABB REM615 motor protection and control relay

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ABB REM615 motor protection and control relay

REM615 is a dedicated motor protection and control relay designed for the protection, control, measurement and supervision of asynchronous motors in manufacturing and process industry. REM615 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 615 series relays support a range of communication protocols including IEC 61850 with Edition 2 support, process bus according to IEC 61850-9-2 LE, IEC 60870-5-103, Modbus® and DNP3. Profibus DPV1 communication protocol is supported by using the protocol converter SPA-ZC 302.

Standard configuration

REM615 is available with four alternative standard configurations. The standard signal configuration can be altered by means of the graphical signal matrix or the graphical application functionality of the Protection and Control IED Manager PCM600. Further, the application configuration functionality of the relay supports the creation of multi-layer logic functions using various logical elements including timers and flip-flops. By combining protection functions with logic function blocks, the relay configuration can be adapted to user specific application requirements.

The relay is delivered from the factory with default connections described in the functional diagrams for binary inputs, binary outputs, function-to-function connections and alarm LEDs. Some of the supported functions in REM615 must be added with the Application Configuration tool to be available in the Signal Matrix tool and in the relay. The positive measuring direction of directional protection functions is towards the outgoing feeder.

Protection functions

The relay offers all the functionality needed to manage motor start-ups and normal operation, also including protection and fault clearance in abnormal situations. The main features of the relay include thermal overload protection, motor start-up supervision, locked rotor protection and protection against too frequent motor start-ups. The relay also incorporates non directional earth-fault protection, negative phase-sequence current unbalance protection and backup overcurrent protection. Furthermore, the relay offers motor running stall protection, loss-of-load supervision and phase reversal protection.

Standard configurations B, C and D additionally offer directional earth-fault protection, three-phase undervoltage protection, negative-sequence overvoltage and positive-sequence undervoltage protection. Further, the B, C and D configurations offer frequency protection including overfrequency, underfrequency and rate-of-change frequency protection modes.

The RTD/mA module offered as an option for standard configurations A and B enables the use of the optional multipurpose protection function for tripping and alarm purposes using RTD/mA measuring data or analog values via GOOSE messages.

In certain motor drives of special importance there must be a possibility to override the motor thermal overload protection to perform an emergency start of a hot motor. To enable an emergency hot start, REM615 offers a forced start execution feature.

Enhanced with optional hardware and software, the relay also features three light detection channels for arc fault protection of the circuit breaker, busbar and cable compartment of metal enclosed indoor switchgear.

The arc-fault protection sensor interface is available on the optional communication module. Fast tripping increases staff safety and security and limits material damage in an arc fault situation. A binary input and output module can be selected as an option - having three high speed binary outputs (HSO) it further decreases the total operate time with typically 4...6 ms compared to the normal power outputs.

Application

REM615 constitutes main protection for asynchronous motors and the associated drives. Typically, the motor relay is used with circuit breaker or contactor controlled HV motors, and contactor controlled medium sized and large LV motors in a variety of drives, such as pumps and conveyors, crushers and choppers, mixers and agitators, fans and aerators.

The motor relay is thoroughly adapted for earth-fault protection. Using cable current transformers sensitive and reliable earth fault protection can be achieved. Phase current transformers in Holmgreen (summation) connection can also be used for earth fault protection. In that case possible unwanted operations of the earth-fault protection at motor start-up due to CT saturation can be prevented using the relay's internal interlocking features or a suitable stabilizing resis

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