ABB REF615 Feeder Protection and Control Relay

Configured for feeder protection and control in electrical distribution systems, the ABB REF615 (REF615 feeder protection and control relay) provides protection, metering, monitoring, reclosing, and substation communication functions. The relay supports feeder applications with rated voltage up to 40.5 kV and rated current up to 5000 A, with IEC 61850, Modbus RTU, and DNP3 communication interfaces.

Hardware Specifications

IEC 61850 Substation Communication and Protection Functions

The REF615 combines feeder protection, control, metering, monitoring, and communication functions in a drawout relay assembly. Protection functions include distance, overcurrent, differential protection, and automatic reclosing. Measurement functions cover voltage, current, active power, reactive power, and energy.

IEC 61850 provides communication with substation automation systems. Modbus RTU and DNP3 are also supported for system-level data exchange. The drawout construction permits removal of the relay hardware for maintenance without requiring removal of the complete installed assembly.

Frequently Asked Questions

Q: What feeder protection functions are specified for the REF615?
A: The supplied data specifies distance, overcurrent, differential protection, and reclosing functions.

Q: Which communication protocols are supported?
A: The supplied data specifies IEC 61850, Modbus RTU, and DNP3.

Q: What electrical range is specified for the protected feeder application?
A: The supplied data specifies rated voltage up to 40.5 kV and rated current up to 5000 A.

Field Installation Guidelines

Install the REF615 in the designated protection and control panel using the specified drawout assembly and mechanical mounting arrangement. Verify that the relay terminals correspond to the approved protection, measurement, control, and communication wiring diagrams before energization.

Keep current-transformer and voltage-transformer circuits separated from communication wiring where required by the panel design. Route communication cables to minimize exposure to high-current switching conductors and other sources of electromagnetic interference.

Terminate cable shields according to the applicable substation grounding design. Verify protective-earth continuity and the polarity and phase identification of all measurement circuits before commissioning.

Before placing the relay into service, verify the configured protection functions, measurement scaling, trip logic, reclosing logic, and communication parameters against the approved protection settings and system design.