PQView is a multi-component software system developed by Electrotek Concepts and EPRI for building and analyzing databases of power quality and energy measurements. Its components build measurement databases, write summary reports, compute power quality indices, view waveforms and rms samples, and trend steady-state quantities via workstations and web browsers. Power providers, industrial power consumers, consulting companies, and university researchers throughout the world widely recognize PQView for its capabilities and flexibility.
PQView build databases with billions of measurements from thousands of monitoring points taken by many different types of meters, including power quality monitors, voltage recorders, in-plant monitors, and digital fault recorders. It can store and analyze information with the measurements about cause and source of triggered events, as well as evaluate the financial impact of events to both a power provider and a power user. It can quickly extract meaningful information from a one megabyte or one terabyte database.
PQView combines powerful features in a user-friendly interface. Measurements can be stored in either Microsoft® Access or Microsoft SQL Server. A complete PQView system consists of three main applications: the Power Quality Data Manager (PQDM), the Power Quality Data Analyzer (PQDA), and PQWeb®.
PQ Data Manager (PQDM)
PQDM automatically builds power quality databases from data sources. It also automatically sends email notifications using SMTP servers or Microsoft Outlook clients when data sources have finished importing, rms voltage variations are imported from data sources, or measurements are not collected from a monitoring instrument for a specified period. PQDM automatically correlates measurements by time stamp and location. It also deletes old measurements, manually adds missed rms voltage, and performs EN 50160 or NVE 1557compliance calculations, automatic derivations, and automatic fault location. In addition, it can manually or automatically update measurements databases once per day, or even as fast as once every minute.
PQ Data Analyzer (PQDA)
Steady-State Data Log Analysis
PQDA creates trends, histograms, and statistical summary tables of more than 125 steady-state characteristics listed within the IEEE Std 1159.3-2003 PQDIF standard. It scores charts, event lists, tables, and indices to analyze voltage sags/dips, swells, and interruptions. PQDA interfaces with Microsoft Word to create summary documents automatically, and allows the user to filter invalid measurements from the final analysis.
Each trend and histogram can be copied automatically into Microsoft Word documents, exported to HTML documents with related graphics files, or sent to a printer. PQDA creates trends, histograms, profiles, and statistics for any steady-state voltage, current, power, and energy quantity. The data for trend and histogram charts can be filtered to exclude invalid measurements. Each trend can become an event timeline by plotting any associated waveform or rms variation measurements as tick marks along the x-axis.
Users can view trends and histograms for the minimum, average, maximum, standard deviation, count, and any percentile for steady-state data in intervals of minutes, hours, days, weeks, months, and years.
PQView can be used to display voltage and/or current waveforms from events. Derivations from waveform samples include interactive phasor charts, spectrum charts from one- to twelve-cycle FFT and DFT transformations, filtered charts, positive-, negative-, and zero-sequence components, voltage transformations through one to four transformer connections, and IEEE P1409 missing voltage. PQDA can quickly build event lists from the millions of events recorded in a measurement database. PQView “measurement events” consist of the waveform and rms samples recorded during voltage sags and swells due to faults and motor starting, and voltage transients due to fuse operations, lightning strikes, load switching, and capacitor and cable energizing. The event lists can be built based on simple queries that only select certain meters for a specific date range. Or, they can be more sophisticated, searching for single-phase sags, three-phase sags, single-phase faults, and three-phase faults.
RMS Voltage Variation Analysis
PQDA can build ITIC Charts, CBEMA Charts, and SEMI F47 Charts, and custom charts that overlay multiple curves. Measurements from each meter can be plotted optionally in a different color. Because PQDA’s rms variation analysis algorithm involves temporal aggregation of multiple events occurring closely in time, users see the event that resulted in a particular voltage magnitude and duration, along with any other events that occurred around the same time at that location.
The rms variation report writer can include monitoring site lists; event lists; SARFI summaries that compute the count or rate of voltage sags; IEC 61000-2-8 DISDIP tables; CBEMA, ITIC, SEMI F47, and timeline scatter plots; and magnitude, duration, and magnitude-duration column charts.
Internet Accessibility via PQWeb
PQView can provide data and reports via the Internet or company intranet. Through PQWeb, also available from Electrotek Concepts, a server runs PQView data analysis tasks and allows you to access and view the results using any web browser. With this software, PQView becomes a multi-platform application, able to work across otherwise incompatible operating systems.
- Radial and network fault location
- Compliance with international and national power quality standards including EuroNorm EN 50160, the Colombian Energy and Gas Regulatory Commission (CREG 024), and the Norwegian Water Resources and Energy Directorate (NVE 1557)
- Voltage sag and interruption contract management
- Power quality event log correlation with SCADA operation logs
- Load forecasting
- Wind generation feasibility and assessment
Support, customization, and development of PQView is provided by Electrotek Concepts through the PQView User Group. Members receive upgrades, technical support, and enjoy access to online resources. Additional support, such as specialty instrument interfaces or report customization, is provided on a time and materials basis.
What Can You Do with PQView?
- Store Billions of Power System Monitoring Measurements in an ODBC Database
- Import /Export IEEE PQDIF and COMTRADE
- Integrate Data from 50 Different Systems
- Define and Schedule Automatic Compliance Reports using ARS
- Share Data via Web Browsers on an Intranet/Internet using PQWeb®
- Perform Voltage Sag and Fault Event Analysis
- Export Charts & Tables to Microsoft Word
- Derive Power Quality Indices
- Send Email Notifications
- Compute IEEE 1564 SARFI Indices
- Build EN 50160 Compliance Tables
- Build Norwegian NVE 1557 Compliance Tables
- Analyze Rapid Voltage Change Events
- Correlate PQ and Fault Events with SCADA
- Compute Phasors, Symmetrical Components, Line Frequency, THD, and Harmonics from Waveforms
- Create Data Log Trends, Histograms, Profiles, Scatter Charts, and Statistical Summary Tables
- Generate ITIC, SEMI-F47, and Custom Voltage Sag Magnitude-Duration Charts
- Summarize Voltage Sags using IEC 61000-2-8, 61000-4-11, and UNIPEDE DISDIP Tables
- Identify, Analyze, and Locate Faults
- Determine Voltage Sag Source Direction
- Assess Capacitor Bank Health
- Estimate Load Growth
- Benefit from Worldwide Collaboration of PQView Users Group