Trend Chart of Voltage RMS

This chart displays one year of rms voltage measurements for Phase A, Phase B, and Phase C.

Daily Trend of RMS Voltage

This chart displays one year of rms voltage measurements for Phase A, Phase B, and Phase C.  The daily minimum, average, and maximum was computed by PQView at display time.

Monthly Trend of RMS Voltage

This chart displays one year of rms voltage measurements for Phase A, Phase B, and Phase C.  The monthly minimum, average, and maximum was computed by PQView at display time.

Histogram of Voltage THD

This histogram displays one year of voltage total harmonic distortion (THD) measurements with statistics for Phase A, Phase B, and Phase C.

Hourly Profile of Voltage THD

This profile chart displays the average voltage total harmonic distortion (THD-V) per hour  for one year of monitoring.  For this substation, the lowest value of THD-V occurs on average at 5:00 AM.

Monthly Profile of Voltage THD

This profile chart displays the average voltage total harmonic distortion (THD-V) per month  for one year of monitoring.  For this substation, the lowest values of THD-V occurred in July.

Trend of Voltage THD with IEEE 519 Limit

This trend of voltage THD measurements shows a horizontal line annotation with the limits recommended by IEEE Std. 519-1992.  You can add any number of horizontal and vertical line annotations to any PQView chart.

Trend of Voltage THD with CP95

This trend of voltage THD measurements shows a horizontal line annotation at the 95th percentile (CP95) for the year.  Only 5% of the samples exceeded this value.  With PQView, you can add a horizontal line easily that shows the value for the chart's minimum, average, maximum, CP01, CP05, CP25, CP50 (median), CP95, CP95, and CP99.

Trend Chart of RMS Voltage with Event Markers

This rms voltage chart shows markers that link to waveform and/rms samples recorded during voltage sag events.