مطالعه تجربی نانوروغن‌های حاوی اکسید آهن، نانولوله‌های کربنی چند جداره و اکسید آلومینیوم در کاهش دمای نقطه داغ ترانسفورماتورها

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی مکانیک، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران

چکیده

در مناطق گرمسیر به‌خصوص در فصل تابستان، بالارفتن دمای محیط سبب افزایش شدید دمای نقطه داغ ترانسفورماتور‌ها می‌شود که نتیجة آن ازکارافتادگی زود‌هنگام ترانسفورماتورها و بروز خسارات جبران‌ناپذیری در شبکه برق خواهد شد. بنابر‌این، تلاش برای کاهش دمای نقطه داغ ترانسفورماتور از اهمیت بسیار بالایی برخوردار است. یکی از روش‌های مدیریت حرارتی ترانسفورماتورهای روغنی، افزایش خواص انتقال حرارت روغن با مواد افزودنی است تا بتوان به طور مؤثر و سریع حرارت اتلافی از سیم‌پیچ‌ها و هسته را به محیط اطراف منتقل کرد. ازاین‌رو در این پژوهش به مطالعه تجربی عملکرد سه نانوروغن اکسید آلومینیوم، اکسید آهن و نانولوله‌های کربنی چند جداره در یک ترانسفورماتور روغنی آزمایشگاهی با حداکثر توان نامی 150 وات پرداخته می‌شود. بدین منظور نانوذره‌های مذکور با غلظت  g/L0/5 با روغن معدنی ترانسفورماتور مخلوط شده و در ترانسفورماتور مورد آزمایش قرار می‌گیرند. نتایج نشان داد که افزودن نانوذرات به روغن تا محدوده مجاز برای عامل‌های مختلف، منجر به بهبود خواص فیزیکی نانوروغن می‌شود که می‌تواند نقش مؤثری در مدیریت حرارتی روغن ترانسفورماتور داشته‌ باشد. به‌عنوان نمونه در 100 درصد توان کامل ترانسفورماتور، نانوروغن‌های اکسید آلومینیوم، اکسید آهن و نانولوله‌های کربنی چند جداره به ترتیب موجب کاهش2/1، 1/3 و 5/4 درجه سانتی‌گراد در دمای نقطه داغ ترانسفورماتور نسبت به آزمون پایه با روغن معدنی می‌شوند که دلیل اصلی آن بهبود ضریب هدایت حرارتی نانوروغن است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental Study of Nano-Oils Containing Iron Oxide, multi-walled carbon nanotubes, and Aluminum Oxide in Reducing the Hot Spot Temperature of Transformers

نویسندگان [English]

  • Fateme Tavakoli Dastjerd
  • Amirhossein Joveini
  • Mohammad Derayatifar
  • Hamid Niazmand
Department of Mechanical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
چکیده [English]

In tropical regions, particularly during the summer, the rise in ambient temperature causes a significant increase in the hot spot temperature of transformers, which can result in the early failure of transformers and cause irreparable damage to the power grid. Therefore, efforts to reduce the hot spot temperature of transformers are of great importance. One method of thermal management for oil-immersed transformers is to enhance the heat transfer properties of the oil with additives, allowing for the effective and rapid dissipation of heat from the windings and core to the surrounding environment. In this study, the experimental performance of three nan-oil aluminium oxide, iron oxide, and multi-walled carbon nanotubes was evaluated in a laboratory-scale oil-immersed transformer with a maximum rated power of 150 watts. To this end, the aforementioned nanoparticles were mixed with transformer mineral oil at a concentration of 0.5 g/L and tested in the transformer. The results showed that adding nanoparticles to the oil, within the permissible range for various parameters, improved the physical properties of the nano-oil, which could play a significant role in the thermal management of transformer oil. For example, at 100% of the transformer's full power, the aluminium oxide, iron oxide, and multi-walled carbon nanotube nano-oils reduced the hot spot temperature by 2.1°C, 1.3°C, and 5.4°C, respectively, compared to the baseline test with mineral oil. The primary reason for this improvement is the enhanced thermal conductivity of the nano-oil.

کلیدواژه‌ها [English]

  • Transformer
  • Oil
  • Nanoparticle
  • Hot Spot Temperature

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نشریه مهندسی مکانیک امیرکبیر
دوره 56، شماره 5
1403
صفحه 741-762

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