EIT - Effects of Harmonics on Distribution Transformer Efficiency



Energy efficiency has garnered extensive interest over the past decade. Hence, transformer efficiency in distribution networks has been widely studied. A few researchers believe that more efficient transformers must be considered, whereas others believe in making improvements in distribution network characteristics to be able to make the most out of distribution transformers. The advantages and disadvantages of Compact Fluorescent Lamps (CFLs) and Light Emitted Diode (LED) Lamps from an energy perspective have been debated quite effectively in literature. As the power utilities and their customers are showing increased concern about energy efficiency and power quality, some mixed feelings toward new household lamps exist. Thus, the effect of harmonic distortion owing to CFLs’ and LEDs’ extensive usage was studied.

In this webinar, CFL and LED are first introduced with a focus on their vital electric characteristics. Subsequently, transformer de-rating under non-sinusoidal conditions from the standard point of view is investigated. Additionally, the current harmonic levels of the lamps were measured using a power quality analyzer. Transformer loading was calculated and simulated for both the CFL and LED loads. Finally, the effect of CFLs on transformer de-rating is compared to that of the LEDs.

Key takeaway from this webinar:

Be able to evaluate transformer efficiency and derating in the case of non-sinusoidal loads.
Be able to analyze the effects of various types of lamps on transformer losses.
A combination of CFLs and other types of lamps are recommended to minimize harmonic distortion levels.
Presenter: Dr. Mohammad (Mo) Salay Naderi, EIT Lecturer & Electric Power Systems Expert

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