Description
REF615 is a dedicated feeder protection and control relay for protection, control, measurement and supervision of overhead lines and cable feeders in utility and industrial power distribution systems, including radial, looped and meshed distribution networks, with or without distributed power generation. Product benefits • Extensive range of protection and control functionality, either with sensors or conventional instrument transformers • Ready-made standard configurations for fast and easy setup with tailoring capabilities • Withdrawable plug-in unit design for swift installation and testing • Large graphical display for showing customizable SLDs, accessible either locally or through an easy-to-use web-browser-based HMI • Extensive life-cycle services Product features • Directional and non-directional overcurrent and earth-fault protection, voltage, frequency and power based protection and measurement functionality • Extensive earth-fault protection portfolio with unique multi-frequency admittance-based protection for higher sensitivity and selectivity • Optional advanced and fast fault location of short circuits and earth faults, arc protection and high-speed outputs
The REF615 provides main protection for overheadlines, cable feeders, and busbar systems of distribution substations. It can be applied for protection andcontrol of grounded and ungrounded distribution systems. Flexible order coding allows for choosing current-only or current-and-voltage configurations tobest fit your distribution feeder application needs. The REF615 is the most powerful, advanced and simplest feeder protection relay in its class, perfectly offering time and instantaneous overcurrent, negativesequence overcurrent, phase discontinuity, breakerfailure, thermal overload, and voltage metering andprotection. The relay also features optional high impedance fault (HIZ) protection for grounded and ungrounded distribution systems. Also, the relay incorporates a flexible three-phase multi-shot auto-reclosefunction for automatic feeder restoration in temporary faults on overhead lines. The REF615 also integrates basic control functionality,which facilitates the control of one circuit breaker viathe relay’s front panel human machine interface (HMI)or remote control system. To protect the relay fromunauthorized access and to maintain the integrity ofinformation, the relay has been provided with a fourlevel, role-based user authentication system, with individual passwords for the viewer, operator, engineer,and administrator levels. The access control systemapplies to the front panel HMI, embedded webbrowser based HMI, and the PCM600 relay setting andconfiguration tool.
REF615 supports the new IEC 61850 standard for inter-device communication in substations. The relayalso supports the industry standard DNP3.0 and Modbus® protocols. The implementation of the IEC 61850substation communication standard in REF615 encompasses both vertical and horizontal communication, including GOOSE messaging and parameter set-ting according to IEC 61850-8-1. The substationconfiguration language enables the use of engineering tools for automated configuration, commissioning, and maintenance of substationdevices. For continuous knowledge of the operational availability of the REF615 features, a comprehensive setof monitoring functions to supervise the relayhealth, the trip circuit, and the circuit breakerhealth is included. The breaker monitoring can include checking the wear and tear of the circuitbreaker, the spring charging time of the breakeroperating mechanism and the gas pressure of thebreaker chambers. The relay also monitors thebreaker travel time and the number of circuitbreaker operations to provide basic informationfor scheduling breaker maintenance.
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