Feeder Protection REF615

REF615 is a dedicated feeder protection relay designed for the protection, measurement and supervision of utility substations and industrial power systems. Re-engineered from the ground up, the relay has been guided by the IEC 61850 standard for communication and interoperability of substation automation devices. The relay provides main protection for overhead lines and cable feeders in distribution networks. The relay is also used as back-up protection in applications, where an independent and redundant protection system is required. Depending on the preconfiguration made, the relay is adapted for the protection of overhead line and cable feeders in isolated neutral, resistance earthed, compensated and solidly earthed networks. 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 GOOSE messaging and Modbus®.

The feeder protection relay REF615 is available with four alternative standard configurations. The table below indicates the functions supported by the different relay configurations.

The relay offers overcurrent and thermal overload protection, directional and nondirectional earth-fault protection, sensitive earthfault protection, phase discontinuity protection, transient/intermittent earth-fault protection and three-pole multi-shot auto-reclose functions for overhead line feeders. 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 personal safety and limits material damage within the switchgear in an arc fault situation.