RET615 is a dedicated transformer protection and control relay for protection, control, measurement and supervision of power transformers, unit & step-up transformers, including power generator-transformer blocks, in utility and industrial power distribution systems.

• Transformer differential with voltage protection and measurement functionality
• Supports various neutral earthing options, matching either high-impedance or numerically low-impedance restricted earth-fault principles
• Optional arc protection and high-speed outputs
• Supports IEC 61850 Editions 1 and 2, including HSR and PRP, GOOSE messaging and IEC 61850-9-2 LE for less wiring and supervised communication
• IEEE 1588 V2 for high-accuracy time synchronization and maximum benefit of substation-level Ethernet communication
• Supports Modbus, DNP3 and IEC 60870-5-103 communication protocols