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The Effect of Voltage Reduction on a Single Phase Load System

This study evaluates the effects of voltage reduction on energy savings and performance in single-phase load systems. It investigates how reduced voltage impacts various devices, including incandescent and compact fluorescent lamps, and a single-phase motor. Preliminary results indicate that lower voltage can decrease power consumption while maintaining lamp performance. The research aims to enhance energy efficiency strategies and assess potential harmful effects of voltage reduction on electrical equipment. Future work will involve further testing on computer power supplies and HID lamps.

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The Effect of Voltage Reduction on a Single Phase Load System

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  1. The Effect of Voltage Reduction on a Single Phase Load System Amit Kanungo

  2. Organization • School of Engineering San Francisco State University • Center of Power Electronics and Motion Control • Industrial Assessment Center (DOE’s Energy Efficiency Program)

  3. Sponsors • APPA • DEED Student Research Grant • Alameda Power & Telecom • Electric and telecommunications municipal utility serving the City of Alameda, CA (Founded 1887) • Electric customers: 33,000 – Telecom customers: 15,000 • More than 80% electricity from renewable resources, 50% of it from geothermal power

  4. Outline • Our Concern • Background • Objective • Work Plan • Test Setup • Preliminary Result • Speculations & Limitations • Conclusion & Future Work

  5. Our Concern • Does it conserve energy? • Is performance degraded? • Safety of the device? • Is it convenient?

  6. Background • Why do this? • What work has been done on this issue? • What are the applications of this system? • What are the pros and cons?

  7. Objective • To study the effect of voltage reduction in energy savings • To understand the potential harmful side effects of the voltage reduction on different equipment • To compare the performance of the equipment at reduced voltage to that of nominal voltage with the existing voltage (120 volts)

  8. Work Plan • Testing of incandescent and compact fluorescent lamps under different voltage • Single phase motor testing under different loads when the input voltage is changed • Testing of computer power supply under different load conditions when input voltage is varied

  9. Test Setup for Light Loads

  10. Test Setup for Single Phase Motor

  11. Test Setup for Computer Power Supply

  12. Test Setup Continuation • LabView ▪To Control the Experimental Setup for the Light Load as well as for the Motor and Computer Power Supply

  13. Preliminary Result Voltage vs. Power for CI-60 Lamps

  14. Preliminary Result Voltage vs. Power for CI-75 Lamps

  15. Preliminary Result Voltage vs. Power for CI-100 Lamps

  16. Preliminary Result Voltage vs. Lumen for CI-60 Lamps

  17. Preliminary Result Voltage vs. Lumen for CI-75 Lamps

  18. Preliminary Result Voltage vs. Lumen for CI-100 Lamps

  19. Preliminary Result Voltage vs. Power for CFL-15w Lamps (Brand A)

  20. Preliminary Result Voltage vs. Power for CFL-15w Lamps (Brand B)

  21. Preliminary Result Voltage vs. Power for CFL-15w Lamps (Brand C)

  22. Preliminary Result Voltage vs. Lumen for CFL-15w Lamps (Brand A)

  23. Preliminary Result Voltage vs. Lumen for CFL-15w Lamps (Brand B)

  24. Preliminary Result Voltage vs. Lumen for CFL-15w Lamps (Brand C)

  25. Tabular Comparison of CFL-15w Output Between Voltage

  26. Preliminary Result Voltage vs. Output Power for ½ hp Single Phase Motor50% Loaded

  27. Preliminary Result Voltage vs. Input Power for ½ hp Single Phase Motor50% Loaded

  28. Preliminary Result Voltage vs. Reactive Power for ½ hp Single Phase Motor50% Loaded

  29. Preliminary Result Voltage vs. Output Power for ½ hp Single Phase Motoron Full Load

  30. Preliminary Result Voltage vs. Input Power for ½ hp Single Phase Motoron Full Load

  31. Preliminary Result Voltage vs. Reactive Power for ½ hp Single Phase Motoron Full Load

  32. Preliminary Result Comparison of Efficiency of the ½ hp Motor at Different Load

  33. Preliminary Result Summary • As the voltage increases, the power proportionally increases with the lumen output for incandescent lamps • For compact fluorescent lamps, the lumen output doesn’t increase proportionally with the power and voltage • The input power approximately increases by 2% in each voltage change by keeping the output power almost constant for the single phase motor • The efficiency of the motor improves as it runs on full load

  34. Speculations and Limitations • Voltage reduction may have an effect on the lamp life • No data on dynamic behavior yet

  35. Conclusion & Future Work • Reduction of voltage reduces the power consumption and saves energy • The performance and reliability of these kind of lamps are excellent under this conditions • Input power varies linearly with the voltage for the motor • The efficiency of the motor improves as it runs from low load to full load on different voltages

  36. Conclusion & Future Work • To test the computer power supply under different load conditions (from processing an MS-Office to operating a graphic program) by varying the voltage. • To test HID lamps under varying voltage

  37. Questions

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