Three-phase thermal overload protection, two time constants (T2PTTR) - Arc protection - Merging unit - Transformer protection - 2 winding - Product Guide - RET615 Transformer Protection and Control - Relion 615 series - 5.0 FP1 IEC - IEC - 09.02.2023

RET615 Product Guide
Table 1. Three-phase thermal overload protection, two time constants (T2PTTR)
Characteristic Value
Operation accuracy Depending on the frequency of the measured current: fn ±2 Hz
Current measurement: ±1.5% of the set value or ±0.002 x In (at currents in the range of 0.01...4.00 x In)
Operate time accuracy 1 ±2.0% of the theoretical value or ±0.50 s
1 Overload current > 1.2 x Operate level temperature