Three-phase power and energy measurement (PEMMXU) - Arc protection - Merging unit - Transformer protection - 2 winding - Product Guide - RET615 Transformer Protection and Control - 5.0 FP1 IEC - IEC - 24.05.2023

RET615 Product Guide

Table 1. Three-phase power and energy measurement (PEMMXU)
Characteristic Value
Operation accuracy

At all three currents in range 0.10…1.20 × I n

At all three voltages in range 0.50…1.15 × U n

At the frequency f n ±1 Hz

±1.5% for apparent power S

±1.5% for active power P and active energy 1

±1.5% for reactive power Q and reactive energy 2

±0.015 for power factor

Suppression of harmonics DFT: -50 dB at f = n × f n, where n = 2, 3, 4, 5,…
1 |PF| >0.5 which equals |cosφ| >0.5
2 |PF| <0.86 which equals |sinφ| >0.5