Waveform Samples during Fault

In this example recorded at a medium voltage substation, we see a two-phase fault that evolves into a three-phase fault.  PQView can compute residual current automatically from waveform samples.  Residual current is useful when detecting single-phase faults in grounded systems.

RMS Samples during Fault

This chart shows the rms samples during the fault.  If the monitor does not record rms, then PQView can compute rms samples from the waveform samples automatically.

Apparent Power

PQView can derive real, reactive, and apparent power automatically from waveform samples and/or rms samples recorded by the monitoring device.

Load Reactance

PQView can derive line-neutral and line-line load reactance if the monitoring device records voltage and current waveform samples.  This calculation is useful in estimating fault location for two-phase and three-phase faults.

Load Impedance

In addition, PQView can derive line-neutral and line-line load impedance if the monitoring device records voltage and current waveform samples. 

Phasors

PQView can interactively display phasor charts displaying voltage, current, and impedance magnitude and phase angles.

Delta Current

PQView can display the additional current compared to the start of the measurement.  In this example, the two-phase and three-phase faults are much easier to see.

Symmetrical Components

PQView can derive and display the positive-sequence, negative-sequence, and zero-sequence for both voltage and current.  The quantities are invaluable in completing fault analysis.