Web-based Interrogation & Control of a Power Quality

Data Acquisition Device

Jason KobergerHardware Design

Research

Testing

Melissa WilsonDocumentation

Hardware Design

Research

Glenn Wilson

DESIGN TEAM:

Dr. Mark HalpinTeam Advisor

Team Leader

Web Page

Software Design

Research

Outline• Power Quality Background

• Current Data Acquisition Device

• Problem

• Solution

• Design Constraints

• Test Specifications

• A Glimpse of the Future

Power Quality Background• Relatively New Concept

– Power Deregulation– Increased Technology

• What is Quality Power?– Reliable Operation– Proper Grounding & Wiring– Acceptable Signal Levels– Smooth Signal Waveforms

Current Data Acquisition Device

• Voltage Divider & “Dumb” Terminal

• Download Information from Data Acquisition Card

• Computer Required to Access Data

Problem

• Signal Information is not Readily Available– Remotely

• Nonexistent

– On-site• Must have computer available

Design Constraints

• Temperature: 0°-50° C

• Display Accuracy: min 1V; increment 1V

min 0.1A; increment 0.1A

• Tri-State Status Indicator: Good, Marginal & Unacceptable Signal Levels

• Update Frequency: once per ½ second

• Browser Capability: Netscape & Microsoft

Design Constraints• Server: Windows NT IIS

• Coordination: LCD display & Port Indicator

• Physical Packaging: Physical Constraints of Existing Device

• Communication Constraints: A/D Card or RS232 Serial Port

• Cost: $50.00

Approach

• Remotely– Web Interface Designed– Access Current Readings from Device– Access Historical Data from Device– Display Graph of Historical Information

Approach

• On-site– 4-Channel Voltmeter– LED/LCD Display Added– Good/Bad Signal Indicator– Button(s) to Cycle Through LED/LCD Data

Test Specifications

REQUIREMENTSCIRCUIT

MODELING

SOFTWARE TESTING &

DEBUGGING

THERMAL TESTING

INSTRUMENT TESTING

Temperature •Display Accuracy •Tri-State Status

Indicator •

Update Frequency •

Browser Capability •

Test Specifications

REQUIREMENTSCIRCUIT

MODELING

SOFTWARE TESTING &

DEBUGGING

THERMAL TESTING

INSTRUMENT TESTING

Server • Coordination •

Physical Packaging •Communication

Constraints •

Cost •

Test Specs Description

• Circuit Modeling– Size Limitations– Within Budget Requirements– Correct Functionality

• Resources– AutoCAD 14– Electronics Workbench 4.1

Test Specs Description

• Software Testing and Debugging– Virtual Circuit– Design Interface– Develop Server Components

• Resources– Microsoft Internet Information Server– Microsoft Visual C++ & Visual Basic– Forte for Java CE

Test Specs Description

• Thermal Testing– Functionality at Specified Temperature Range

• Resources– Space Heater– Thermocouple– Stopwatch

Test Specs Description• Instrument Testing

– Performed on Final Product– Accuracy of LED/LCD Display Tested– Coordination Between Display and Signal LED– Update Frequency Tested

• Resources– LabVolt Stations– Programmable Function Generators

A Glimpse of the Future

Questions?

References[1] “Home Power Quality,” http://energyoutlet.com/res/powerqual/index.html,

Energy Outlet, Iris Communications, Inc, USA, 1996.

[2] R. C. Dugan, M. F. McGranaghan, and H. W. Beaty, Electrical Power Systems Quality, McGraw-Hill, New York, New York, USA, p. 1-3, 1996.

[3] W. M. Grady and A. H. Noyola, “End User and Electric Utility Perspectives,” Results of Power Quality Surveys in the United States, University of Texas at Austin, Austin, Texas, USA, 1995.

[4] C. Peacock, “Interfacing the PC, ” http://www.beyondlogic.org/serial/serial3.htm, USA, February 28, 2000.

References[5] T. Cambra, “Developing a Visual Basic Component for IIS/MTS,”

http://msdn.microsoft.com/workshop/server/components/vbmtsiis.asp, Microsoft Development Network, USA, June 19, 1998.

[6] D. Adair, J. Ball, and M. Pawlan, “Trail: 2D Graphics,” http://web2.java.sun.com/ docs/books/tutorial/2d/index.html, Sun Microsystems, USA.

[7] P. Coleman and M. Halpin, “Long Term Monitoring”, 1999 Southeastern Meter School & Conference, pp. 2-3, Birmingham, Alabama, USA, 1999.

[8] W. Berry, “COM Objects and ASP,” http://msdn.microsoft.com/workshop/server/ asp/comtutorial.asp, Microsoft Development Network, USA, January 12, 1998.

References[9] “LCD Products,” http://www.eio.com/lcdprodt.htm, Electronics

Information Online, USA, August 23, 2000.

[10] “Newark Electronics” http://www.newark.com, Newark Electronics, USA, 2000.

[11] R. Moffat, “ElectronicsCooling”, http://www.electronics-cooling.com/Resources/ECArticles/JAN97/jan97-01.htm, Stanford University, Stanford, California, USA, January 1997.

[12] “California Instruments: Programmable AC Power Sources”,

http://www.ixpres.com/calinst/acpower.htm, California Instruments, San Diego, California, USA, September 2000.