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.
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[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.
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[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.