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Relion 620 Series RET620 Transformer Management Relay Product Guide

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This document is a product guide for the ABB Relion 620 Series RET620, a dedicated two-winding power transformer management relay for protection, control, measurement, and supervision in utility and industrial power distribution systems. It details the relay's default configurations, protection functions, communication protocols (including IEC 61850 Edition 2, Modbus, DNP3), and technical specifications for the product version 2.0 FP1.

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