High-impedance based restricted earth-fault protection (HREFPDIF) - Arc protection - Merging unit - Motor protection - Product Guide - REM620 Motor Protection and Control - Relion 615 series - 2.0 FP1 IEC - IEC - 09.02.2023

REM620 Product Guide

Table 1. High-impedance based restricted earth-fault protection (HREFPDIF)
Characteristic Value
Operation accuracy Depending on the frequency of the measured current: fn ±2 Hz
±1.5% of the set value or ±0.002 × In
Start time Minimum Typical Maximum
1 , 2 IFault = 2.0 × set Operate value

16 ms

21 ms

23 ms

IFault = 10 × set Operate value

11 ms

13 ms

14 ms

Reset time Typically 40 ms
Reset ratio Typically 0.96
Retardation time <35 ms
Operate time accuracy in definite time mode ±1.0% of the set value or ±20 ms
1 Current before fault = 0.0 × I n, fn = 50 Hz, results based on statistical distribution of 1000 measurements
2 Includes the delay of the signal output contact