This document introduces the features and characteristics of the MRR1 multifunction generator rotor protection relay, including rotor grounding fault protection and excitation current monitoring. The relay is suitable for synchronous generators and engines with a capacity of 1 MVA or above.
The SEG MRR1 is a multi‑function rotor protection relay for synchronous generators. It provides rotor ground‑fault detection, excitation‑current monitoring and rotating‑diode failure protection, with programmable alarm and trip functions.
The document covers introduction, key features, mechanical design, wiring diagrams, LED indicators, operation principles, step‑by‑step setting procedures, relay testing, full technical specifications and ordering information. It also explains how to configure the RS‑485 interface and how to reset or lock out protection functions. This manual is written in Chinese.