PeakTech 4145 Bedienungsanleitung Seite 77

current for each phase relative to the reference phase (A/L1)and angles between
voltage and current for each phase.
Available function keys:
F4 Access Phasor screen.
F5 Switch between RUN and HOLD.
 Phasor
Shows the phase relation between voltages and currents in a vector diagram divided
in 30 degree sections. The vector of the reference channel A (L1) points to the
horizontal direction. Additional numerical values are given: negative voltage and
current unbalance percentage, zero sequence voltage and current unbalance
percentage, fundamental phase voltage and current, frequency, phase angles. With
function key 【F1】, you can choose readings of all phase voltages, phase currents
or voltage and current in one phase.
Available function keys:
F1 Selection of signals to be displayed: V displays all voltages; A displays all
currents. L1, L2, L3 give simultaneous display of phase voltage and current.
F4 Return to unbalance table screen.
F5 Switch between RUN and HOLD.
 Tips and Hints
The voltages and currents in the table can e.g. be used to check if power applied to a
3-phase induction motor is in balance. Voltage unbalance causes high unbalanced
currents in stator windings resulting in overheating and reduced motor life. Negative
voltage component Vneg should not exceed 2%, current unbalance should not
exceed 10%. In case of too high unbalance, use other measuring modes to further
analyze the power system.
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