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.
2. 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 userspecific 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.

The relay offers all the functionality needed to manage motorstart-ups and normal operation, also including protection andfault clearance in abnormal situations. The main features of therelay include thermal overload protection. motor start-upsupervision, locked rotor protection and protection against toofrequent motor start-ups. The relay also incorporates non-directional earth-fault protection, negative phase-sequencecurrent unbalance protection and backup overcurrentprotection. Furthermore, the relay offers motor running stal!protection,loss-of-load supervision and phase reversalprotection.
Standard configurations B, C and D additionally offer directionalearth-fault protection, three-phase undervoltage protection.negative-sequence overvoltage and positive-sequenceundervoltage protection. Further, the B, C and D configurationsoffer frequency protection including overfrequency,underfrequency and rate-of-change frequency protectionmodes.
The RTD/mA module offered as an option for standardconfigurations A and B enables the use of the optionalmultipurpose protection function for tripping and alarmpurposes using RTD/mA measuring data or analog values viaGO0SE messages.
In certain motor drives of special importance there must be apossibility to override the motor thermal overload protection toperform an emergency start of a hot motor. To enable anemergency hot start, REM615 offers a forced start executionfeature.
Enhanced with optional hardware and software. the relay alsofeatures three light detection channels for arc fault protection ofthe circuit breaker, busbar and cable compartment of metal-enclosed indoor switchgear.