Amprobe DMIII-Multitest Power-Quality-Recorder Manual do Utilizador descarregar pdf (Página 99)

AMPROBE

DMIII MULTITEST

EN-97

16.8.2. 3 Phase 3 Wire System

In the electrical systems distributed without neutral, the phase voltages and the power

factors and phase cos lose importance. Only the phase-to-phase voltages, the phase

currents and the total powers remain defined.

Phase 1

Phase 2

Phase 3

W 1-2

VAR 1-2

W 3-2 VAR 3-2

Three-phase

Equipment

In this case the potential of one of the three phases (for example, phase 2) is taken on as

reference potential. The total values of the active, reactive and apparent power are

expressed as sum of the indications of the couples of Wattmeters, VARmeters and

VAmeters.

   

2321









VARVARWWS

VARVARQ

WWP

TOT

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Amprobe DMIII-Multitest Power-Quality-Recorder Manual do Utilizador Página 99