Example PQView Charts

Voltage and Current Waveforms

PQView can display voltage and current waveforms recorded by power quality monitors, microprocessor relays, and digital faulr recorders.

Derived RMS Values

If the meter that recorded the voltage and current waveforms did not include the rms values, then PQView can compute the rms values during import or during analysis time.

Derived Characteristic Voltage

PQView can derive characteristic voltage from the line-neutral voltage. Characteristic voltage tries to find the worst-case of the line-neutral and line-line voltages and takes consideration of the effect of zero-sequence voltage.

ITI (CBEMA) Magnitude-Duration Scatter Chart

The ITIC curve plots the magnitude of the disturbance (in percentage) on the Y-axis and the duration of the disturbance on the X-axis. Disturbances that fall within the envelope defined by the upper and the lower curve are typically not harmful to electrical equipment; disturbances that fall outside the envelope may disrupt or damage the equipment. Both the CBEMA and ITIC curves also plot voltage with respect to duration, but as a percentage of absolute voltage. Electronic equipment can withstand high voltages provided they last for less than 1 millisecond in duration, but voltage cannot be greater than +10 percent or -20 percent for between 0.5 seconds and 10 seconds duration. These curves also offer a convenient way to define acceptable power-quality limits. However, the standard curves should be used only as guides.

CBEMA Magnitude-Duration Scatter Chart

The chart presents a scatter chart of rms voltage variation events with the 1986 CBEMA Curves overlaid.

SEMI Std. 2844A Magnitude-Duration Scatter Chart

The chart presents a scatter chart of rms voltage variation events with the 1986 SEMI F47 Curve overlaid.

ITI (CBEMA) RMS Variation Magnitude Duration Scatter Plot

This chart demonstrates how PQView can display different colors for the phase that was most impacted during a voltage sag.

RMS Variation Event Count Magnitude Column Chart

This chart presents a histogram of the minimum rms voltage magnitude per event for a selected set of meters and date range.

RMS Variation Duration Column Chart

This chart presents a histogram of the duration of each event for a selected set of meters and date range.

RMS Variation Event Count Magnitude Duration Column Chart

This chart presents a cross tabulation of the minimum rms voltage magnitude per event for a selected set of meters and date range.

RMS Variation Magnitude Duration Cumulative Contour Chart

This chart presents a cumulative cross tabulation of the minimum rms voltage magnitude per event for a selected set of meters and date range. It follows the charting method recommended by IEEE Std 1346.

Real Power

This derived chart shows the real power from the start of the voltage sag to its conclusion.

Reactive Power

This derived chart shows the reactive power from the start of the voltage sag to its conclusion.

Apparanet Power

This derived chart shows the apparent power from the start of the voltage sag to its conclusion.

Derived Energy

This derived chart shows a calculation of energy from the start of the voltage sag to its conclusion.