Arc protection (ARCSARC) - Arc protection - Merging unit - Transformer protection - 2 winding - Product Guide - RET615 Transformer Protection and Control - Relion 615 series - 5.0 FP1 IEC - IEC - 24.05.2023

RET615 Product Guide

Table 1. Arc protection (ARCSARC)
Characteristic Value
Operation accuracy

±3% of the set value or ±0.01 × I n

Operate time Minimum Typical Maximum

Operation mode = "Light+current"

9 ms

4 ms

12 ms3

6 ms4

15 ms3

9 ms4

Operation mode = "Light only" 2

9 ms3

4 ms4

10 ms3

6 ms4

12 ms3

7 ms4

Reset time Typically 40 ms
Reset ratio Typically 0.96
1 Phase start value = 1.0 × I n, current before fault = 2.0 × set Phase start value, f n = 50 Hz, fault with nominal frequency, results based on statistical distribution of 200 measurements
2 Includes the delay of the heavy-duty output contact
3 Normal power output
4 High-speed output