MRF2 is a universal frequency relay with over- or underfrequency protection, frequency gradient monitoring df/dt and a quick grid disconnect for generators in the event of a grid fault.
This manual describes the features, performance, and working principle of the SEG MRF2 frequency‑rate relay. It explains the circuit architecture, digital processing, and the measurement of frequency and df/dt values.
The document also covers operation and adjustment procedures, LED indicator meanings, parameter settings, and wiring diagrams for both primary and secondary side connections. A specification table and output assignment details are provided at the end. This manual is written in Chinese.
| Rated frequency | 50 Hz |
|---|---|
| First frequency element start frequency | 48.00 Hz |
| Frequency measurement repeat count | 4 |
The relay is rated for a frequency of 50 Hz.
The frequency measurement is repeated four times.