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TERZİ, ÜMİT KEMALETTİN

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ÜMİT KEMALETTİN

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Author: AKAR, ONUR × Has files: true ×

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    PublicationOpen Access
    Location of transformers during the extension of an electricity distribution network
    (2022-10-01) AKAR, ONUR; TERZİ, ÜMİT KEMALETTİN; Akar O., Terzi Ü. K., Ozgonenel O.
    The electricity network of a country is in continuous development, including the distribution transformers that provide power within a city. Efficient electricity networks depend on the good implementation of the principles of network planning and development. Moreover, technology development and the increasing standard of living are creating greater electricity demand. Besides, housing developments alter the need for electricity in an urban area and will require changes to control load density, adjustment of the voltage on distribution lines, installation of new lines and substations, and restructuring of existing ones. This study develops new mathematical and geometric methods that can be applied to all Low Voltage distribution networks to investigate load distribution, the effects of change and, provide a tool for distribution network planning. The analysis included the electrical power values to the new transformer, the shortest distribution routes between the transformers, and the costs, and provided optimum locations for new transformers. In this way, distribution network planning has been approached with a new method.
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    PublicationOpen Access
    Experimental investigation of the effect of inrush current created by LED drivers on switching elements
    (2024-08-01) AKAR, ONUR; TERZİ, ÜMİT KEMALETTİN; Balci S., AKAR O., TERZİ Ü. K.
    The demand for lighting technology is increasing rapidly with the increasing population and the advancement of industrialization. Significant developments are taking place in the field of lighting to meet this demand. LED lighting technology, which is the most current of these developments, is preferred to a high degree as it is more efficient, long-lasting, and advantages compared to conventional lighting technologies. However, this technology is still in its development stage and problems may be encountered that need to be solved. In this study, the problems that caused by inrush current and damage to the switch contacts of LED armatures using different protection classes as a result of multiple switching were observed with switching elements complying with IEC 60669-1 standards. The damage on these two switching elements was tested by connecting them with 69 LED armaturesof 12A-36W and starting-stopping 10000 times, 40 times per minute. As a result of the test, corrosion/damage that could cause major fires was observed in the LED switching elements and pictures were taken with the help of Scanning Electron Microscope (SEM).The study shows the importance of creating a special international material standard for LED switchingsystems and ensuring that manufacturers comply with this standard.Keywords:Lighting, LED, Inrush Current, SEM