PQWeb^®

PQWeb^® enables utility and industrial users to view power quality data via a Web browser program such as Netscape Navigator^® or Microsoft^® Internet Explorer. Utilizing these readily available applications, PQWeb eliminates the engineering effort and costs of developing custom client-side applications.

PQWeb enables users to view downloaded and characterized power quality disturbance data. Designed with password protection for data security, the software can be used for both Internet and company intranet (local area network) applications.

By using PQWeb, a user wanting to look at events from last week, can enter a password, select a site or sites of interest, and the date/time range of interest. From this, the user can select a particular event and which voltage or current phases are desired for a detailed view of the disturbance.

PQWeb works with a variety of power monitoring instruments and data formats including

• Dranetz-BMI Signature System 5501/02 InfoNode^®, 5571 DataNode^®, 5540 DataNode, EPQ Series DataNode, and 5590 DualNode^TM

• PASS^® - Dranetz-BMI PQNode^® 8010 and 8020

• Power Evaluation Software (PES) - Dranetz-BMI PQNode^® 7100 and PQPager^® 3100

• Omega - Reliable Power Recorder^TM

• Power Quality Data Interchange Format - IEEE 1159.3 (PQDIF)

How It Works

The heart of PQWeb is the PQView^® power quality data management system. PQView stores data retrieved from power quality measurement devices into a large database and eliminates the need for repetitive tasks such as data characterization and analysis and report writing. Until PQView arrived on the scene, instrument and event data had to be analyzed using separate applications, requiring an engineer to master each one in order to make a complete analysis.

Incorporating technology developed under EPRI sponsorship, PQView not only brings all the information together into one relational database, but it provides the power quality engineer with the means to automate both the loading of new data and the generation of monitoring reports. PQView comes with a base set of reports which provide information on raw measurements, detailed statistical analysis, and executive summaries.

From retrieved data, PQView has the ability to perform statistical studies such as trends, histograms, and correlations. These reports allow the engineer to reach all of the audiences interested in the system monitoring results. If a report format is not included in the standard templates, Electrotek can customize a report to utility and customer specifications.

From the databases created and managed by PQView, PQWeb uses a World Wide Web or company intranet server to deliver power quality data and analyses to engineers, customers, and other individuals. Data can be quickly accessed from any computer on the system using a proper user ID and password.

PQWeb - Improving Customer Service

PQWeb offers benefits to both the utility and customer. First, PQWeb provides vital power quality disturbance data in a timely manner to both parties, enabling problems to be identified and corrective actions taken. It also helps identify equipment sensitivity to disturbances on both sides of the meter and helps to pinpoint problems in the utility transmission and distribution system. Finally, PQWeb improves coordination and communication between the utility and its customers in policing power quality problems, increasing the value of the service provided.

PQWeb Improvements with Version 2.2

• Faster. Because PQWeb 2.2 uses OLEDB to access Microsoft Access and Microsoft SQL Server databases, it runs queries significantly faster than PQWeb 2.0, which used DAO.
• Multiple Phase Plots. With version 2.2, PQWeb can now display more than one phase on each plot. This allows you to create waveform, rms voltage variation, and trend graphs that show single or three-phases. You can even combine voltage and current on one chart.
• Online Graph Zooming. You can now rescale the axes for all charts. Also, to take full advantage of large computer displays, or to view reports on small displays, you can customize the size of each image by changing a preference. You can even add a caption to each graph.
• Steady-State Report. We have replaced the Steady-State Analysis Wizard of PQWeb 2.0 with a Steady-State report that is both easier to use and more flexible. The new report creates time trends, histograms, and statistical summary tables of any voltage, current, power, energy, or demand quantity housed in the PQView database. The report can be quickly configured using a preference page, and configurations are saved as cookies with your computer’s web browser. This means that once you are satisfied your steady-state report display settings, they will be immediately available the next time that you run the report.
• More Steady-State Data. PQWeb 2.0 could only process up to 10000 data points at a time. With PQWeb 2.2, steady-state trends could include hundreds of thousands of data points, meaning that you can make trend charts that span years.
• Monitor Availability Report. A new monitor availability report has been added so that you can determine when your power quality monitors were online without needing to run PQView’s Power Quality Data Analyzer.
• ITIC, SEMI, and IEEE 1346 Curves. In addition to offering the CBEMA voltage magnitude versus event duration scatter plot for analyzing rms voltage variations, PQWeb 2.2 includes the Information Technology Industry Council (ITIC) and SEMI Std. 2844A curves for its rms voltage variation report. Three equipment compatibility curves from IEEE Std. 1346-1998 can also be selected.
• PQDIF. Waveforms, rms voltage variations, trends, and histograms can be downloaded as IEEE P1159.3 PQDIF files that can be analyzed or saved to your local computer. For example, TOP, The Output Processor is a free viewer that can read PQDIF files. Another popular PQDIF viewer is DRAN-VIEW.
• Online Help. PQWeb 2.2 offers online help with every web page.
• Database Flexibility. PQWeb 2.2 can query any PQView database stored in Microsoft Access 95, Access 97 or Access 2000 format or in Microsoft SQL Server 6.5 or SQL Server 7.0 format.
• SQL Server Queries Run Faster. PQWeb 2.2 connects directly to SQL Server, where PQWeb 2.0 used a slower indirect connection. This means that queries to SQL Server databases will run significantly faster. Many of the queries in PQWeb have also been redesigned to take advantage of client/server database processing.
• User Customizable. The preferences for each user’s browser are saved locally using cookies.
• Administrator Customizable. As PQWeb 2.2 employs a combination of Active Server Page files and ActiveX server objects, it can be customized and extended by a developer familiar with web programming.
• PQWeb Administration Utility. A new PQWeb Administration utility program is installed on the server to allow fast configuration of multiple PQView databases and user access groups.

Power Quality Monitoring Service Option

Electrotek Concepts^® offers a power quality monitoring service used in conjunction with PQWeb that automatically reports power quality data for a given site. This service is ideal for companies with remote plant locations who want to identify problems. Each night, Electrotek computers can download instrument data via telephone modem link. Options for automatic event notification, data access, and customized reports are available. Please contact Electrotek for more information on this service.

For more information on PQWeb, please contact

PQWeb Demonstration

PowerMonitoring.Com offers PQWeb as part of the monitoring service offering.

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