Three-phase under excitation protection (UEXPDIS) - Arc protection - Merging unit - Motor protection - Product Guide - REM620 Motor Protection and Control - Relion Protection and Control - 2.0 FP1 IEC - IEC - 01.06.2023

REM620 Product Guide

Table 1. Three-phase under excitation protection (UEXPDIS)
Characteristic Value
Operation accuracy Depending on the frequency of the measured current and voltage: f = fn ± 2 Hz
±3.0% of the set value or ±0.2% Zb
Start time 1, 2 Typically 45 ms
Reset time Typically 30 ms
Reset ratio Typically 1.04
Retardation time Total retardation time when the impedance returns from the operating circle <40 ms
Operate time accuracy ±1.0% of the set value or ±20 ms
Suppression of harmonics -50 dB at f = n × fn, where n = 2, 3, 4, 5,…
1 fn= 50Hz, results based on statistical distribution of 1000 measurements
2 Includes the delay of the signal output contact