Creating Trends, Histograms, Profiles, and Statistics using PQView Express

Creating Trends, Histograms, Profiles, and Statisticsusing PQView Express

2© 2008 Electrotek Concepts, Inc. All rights reserved.

Getting Started

•Start PQView Express


Getting Started

•Click on the “Open”command button.•Or, use the menu command File|Open Power Quality Database


Open PQViewDemo.MDB Database

•Open the PQViewDemo.mdb demonstration database. This database is not installed with PQView by can be downloaded from www.pqview.com.– In this example, the database is located here:

• C:\Program Files\PQView Express\Databases\PQViewDemo.mdb

http://www.pqview.com/


Open PQ Event Viewer

•Click on the “View Trends” command button.•Or, use the menu command View|Trends.


Steady State Trends Tool


Steady State Trends Tool

•This tool is used more than just trends:– It can create trend charts, histogram charts, statistical tables,

compliance percentages, and profile charts.


PQView Channel and Formats

•Channel– Unique combination of quantity (voltage, current, power,

energy, etc.), characteristic (rms, THD, PF, etc.), and phase (A, B, C, AB, BC, CA, N)

•Formats– Values: consist of time stamp and measurement for a

channel. Also known as samples and snapshots.– Envelope: consist of minimum, average, and maximum in

regular intervals


Reset Options

•Reset PQDA’s options in case there are non-default preferences set from another tutorial lesson.


Reset the date range to “All Data”


First Trend

•Build an rms voltage trend for the substation site for phase A.

Creates Chart


Resulting Trend


Three Lines for Three Formats

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Substation 5530 - V RMS Afrom 1/31/2003 12:00:00 PM to 3/7/2003 12:57:26 AM

EPRI/Electrotek PQView®Time

Min[V RMS A] (V) Avg[V RMS A] (V) Max[V RMS A] (V)


Steady-State and PASS Data Sources

•Values (Snapshots)– Computed characteristics from waveforms recorded with

PASS SS Wave measurement•Minimum Envelope

– Minimum values of PASS SS RMS measurement•Average Envelope

– Average values of PASS SS RMS measurement•Maximum Envelope

– Maximum values of PASS SS RMS


Steady-State and PES Data Sources

•Values (Snapshots)– Computed characteristics from waveforms recorded with PES

Snapshot measurement•Minimum Envelope

– Minimum values of PES RMS Strip Chart measurement•Average Envelope

– Average values of PES RMS Strip Chart measurement•Maximum Envelope

– Maximum values of PES RMS Strip Chart measurement


Steady-State and RPM Data Sources

•Values (Snapshots)– Flicker measurements

•Minimum Envelope– Minimum values of long-term summaries

•Average Envelope– Average values of long-term summaries

•Maximum Envelope– Maximum values of long-term summaries


Steady-State and PQDIF Data Sources

•All steady-state series must have tagQuantityTypeID=ID_QT_VALUELOG and…– Values (Snapshots)

• tagValueTypeID = ID_SERIES_VALUE_TYPE_VAL– Minimum Envelope

• tagValueTypeID = ID_SERIES_VALUE_TYPE_MIN– Average Envelope

• tagValueTypeID = ID_SERIES_VALUE_TYPE_AVG– Maximum Envelope

• tagValueTypeID = ID_SERIES_VALUE_TYPE_MAX


Steady-State and Encore Series System

•Values (Snapshots)– DataNode 5571: Waveform Snapshots– DataNode 5530: Flicker Pst, Flicker Plt, I Demand, P

Integrated, Q Integrated, S Integrated•Minimum, Average, and Maximum

– All other logs from DataNode 5530, 5540, 5560, 5571


Plot Envelope Average Only

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Substation 5530 - V RMS Afrom 1/31/2003 12:00:00 PM to 3/7/2003 12:57:26 AM

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Avg

[V R

MS

A] (

V)

Time


Mark Histogram Checkbox


Histogram Notes

•The minimum and maximum values of the histogram’s x-axis will match the y-axis of the trend.

•Only instantaneous format values and average values will be in the histogram; minimum and maximum format values are not analyzed by this tool.– Use the “Steady-State Statistics” Tool to create histograms of

minimum and maximum values


Select min/avg/max formats and create trend chart

Then, export to Microsoft Excel


Envelopes with Time Stamps


Select All Three Phases and Export to Excel

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Substation 5530 - V RMS A, V RMS B, V RMS Cfrom 1/31/2003 12:00:00 PM to 3/7/2003 12:57:26 AM


Min[V RMS A] (V) Avg[V RMS A] (V) Max[V RMS A] (V) Min[V RMS B] (V) Avg[V RMS B] (V)

Max[V RMS B] (V) Min[V RMS C] (V) Avg[V RMS C] (V) Max[V RMS C] (V)


Excel shows nine series for the min/avg/max for three phases


Change an Option

Choose to not show every record in Channel Table


Option Changed

•Channel lists are shorter because channels with no data are not being shown.


Deleting Data Points

Let’s delete a voltage sag.


Delete Voltage Sag Points

Toggle the eraser icon button, then click on the voltage sag.


Voltage Sag Data Points Removed

Remember to toggle the eraser icon button to turn off editing mode.


Deleted Data Points

•Data points deleted from the charts in this fashion are not deleted from the database.


Trend Chart Options


V THD Trend

•Create a voltage THD trend for phase A.


Plot Min/Avg/Max Voltage THD for Phase A

•Note that THD automatically is formatted in percent. •We could delete the THD measurement at 4.8%, but let’s try to

filter it instead.

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Substation 5530 - V THD Afrom 1/31/2003 12:00:00 PM to 3/7/2003 12:57:26 AM


Min[V THD A] (%) Avg[V THD A] (%) Max[V THD A] (%)


Min/Max Filter

Set the upper limit to 4%, then re plot the graph again.


VTHD Chart with 4% Filter Enabled

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Substation 5530 - V THD Afrom 1/31/2003 12:00:00 PM to 3/7/2003 12:57:26 AM


Min[V THD A] (%) Avg[V THD A] (%) Max[V THD A] (%)


Plot Voltage THD for Two Sites

Make sure all four formats are enabled.Reset the filter as well.


One Window is Created for Each Sites

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Service Entrance 7100 - V THD A, V THD B, V THD Cfrom 1/31/2003 12:00:00 PM to 3/7/2003 12:57:26 AM


V THD A (%) V THD B (%) V THD C (%)

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Service Entrance 3100 - V THD A, V THD B, V THD Cfrom 1/31/2003 12:00:00 PM to 3/7/2003 12:57:26 AM


V THD A (%) V THD B (%) V THD C (%)


Note about Multiple Graphs

•Up to 32 steady-state trends can be open at a time.•Channels that do not exist for a site are not graphed.


Plot Both Sites on One Chart

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Service Entrance 3100 - V THD A (%)

Service Entrance 3100 - V THD B (%)

Service Entrance 3100 - V THD C (%)

Service Entrance 7100 - V THD A (%)

Service Entrance 7100 - V THD B (%)

Service Entrance 7100 - V THD C (%)

TrendFrom 2/1/2003 to 3/2/2003 12:11:24 AM



Plot Frequency for All Sites


Export V THD Statistics for All Sites


Frequency Statistics


Enable Additional Statistics

•Enable histogram “cumulative probability” statistics


More Statistics


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Substation 5530 - V THD A, V THD B, V THD C, V THD AB, V THD BC, V THD CAfrom 1/31/2003 12:00:00 PM to 3/7/2003 12:57:26 AM


Count 25005Min 1.041Avg 2.366Max 3.675Range 2.635St Dev 0.4958CP01 1.290CP05 1.470CP25 2.016CP50 2.423CP75 2.704CP95 3.138CP99 3.399SI Range 0.3443

Rel

ativ

e F

requ

ency

Cum

ulative Frequency

Avg[V THD A] (%), Avg[V THD B] (%), Avg[V THD C] (%)

Relative Frequency Cumulative Frequency

Additional Statistics on a Single Histogram


Selecting More than One Characteristicsfor a Site

•Select three-phase Real and Apparent Power for the substation site at the same time. Use the <Ctrl> key to multi-select in the channel list box.


Choose to Plot All Channels on one Chart

1. Make sure all four formats are enabled.

2. Then create a Multi Axes Single Site Chart


Multi Axes Chart


Both Channels on One Chart


Same Graph Using MW and MVA

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Substation 5530 - P Total, S Totalfrom 1/31/2003 12:00:00 PM to 3/7/2003 12:57:26 AM


Min[P Total] (MW) Avg[P Total] (MW) Max[P Total] (MW)

Min[S Total] (MVA) Avg[S Total] (MVA) Max[S Total] (MVA)


Change Channel Grouping Preference


Export to Microsoft Word

• Select RMS Voltages and Voltage THD Channels for all four sites at the same time. Use <Ctrl> key to multi-select in the Channel List box. Then press the Microsoft Word icon.


Export to HMTL

•Select RMS Voltages and Voltage THD Channels for all four sites at the same time. Use <Ctrl> key to multi-select in the Channel List box. Then press the HTML icon.


Aggregation

Ask for the maximum three-phase power for the substation 5530.


Aggregation

•Select to compute the maximum value per day


Maximum Three-Phase Power per Day

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Substation 5530 - P TotalMax per Day, from 2/1/2003 to 3/1/2003


Max

[P T

otal

] (M

W)

Time


Aggregating Envelopes

•If your data was recorded as a min/avg/max envelope, then be sure to select the appropriate format when aggregating.

•Select all three envelope formats

•Then try the special aggregating function named “Min Avg Max.”


Minimum, Average, Maximum per Day

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Substation 5530 - P TotalMin,Avg,Max per Day, from 2/1/2003 to 3/1/2003


Min[P Total] (MW) Avg[P Total] (MW) Max[P Total] (MW)


“Percentiles” Function

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Substation 5530 - P TotalCP05,CP50,CP95 per Day, from 2/1/2003 to 3/1/2003


CP05[P Total] (MW) CP50[P Total] (MW) CP95[P Total] (MW)


“Quartiles” Function

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Substation 5530 - P TotalCP25,CP50,CP75 per Day, from 2/1/2003 to 3/1/2003


CP25[P Total] (MW) CP50[P Total] (MW) CP75[P Total] (MW)


Aggregation Notes

•Aggregation Functions– minimum, average, maximum, standard deviation, count,

and Min Avg Max, Percentiles, Quartiles, IntervalChannel•Aggregation Intervals

– second, minutes, hours, day, week, month, quarter, year


Line Type Preference

•Note that you have control of the line type for each format.


Plot 3rd, 5th, and 7th Harmonic (I3,I5,I7) Ampsfor the Substation 5530


Trend of I3 , I5 , I7

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Substation 5530 - Ia H3, Ia H5, Ia H7from 2/1/2003 to 3/1/2003


Min[Ia H3] (A) Avg[Ia H3] (A) Max[Ia H3] (A) Min[Ia H5] (A) Avg[Ia H5] (A)

Max[Ia H5] (A) Min[Ia H7] (A) Avg[Ia H7] (A) Max[Ia H7] (A)


Other Options: Show Grid Lines

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Sample Site 1 - V RMS A

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V RM

S A

(V)

Time

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V RM

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Other Options: Plot Line Gaps

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Min[V RMS A] (kV) Avg[V RMS A] (kV) Max[V RMS A] (kV)

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Min[V RMS A] (kV) Avg[V RMS A] (kV) Max[V RMS A] (kV)


Other Features

•Site Name Alias option– Alternate name for site, just as with PQWeb

•Set Y-Axis Max and Set Y-Axis Min•Include invalid option

– Means to not plot measurements with an invalid status•Quick Pick command button

– Automatically selects all of the sites selected by the Select Sites form.

•Plot formats in different colors


Profile Charts


Event Links

Documents

Creating Trends, Histograms, Profiles, and Statistics using PQView Express