Design of 100kVA Ultra-High Efficiency Pole Transformer by Improving Eddy Current Losses Kim, Sang-Hyun Department of Electrical Engineering Graduate School of Soongsil University

                                     3-4 Estrutura do núcleo do transformador

 Design of 100kVA Ultra-High Efficiency Pole Transformer by Improving Eddy Current Losses Kim, Sang-Hyun Department of Electrical Engineering Graduate School of Soongsil University

ABSTRACT

In Korea, electricity demand is increasing due to industrial development and economic growth. Due to the increase in power demand, transmission and distribution losses are also increasing. The transmission and distribution loss rate in Korea is 3.6% of the total electric energy, of which about 2% is caused by losses in distribution transformers. Power transformers with high capacity and voltage have already achieved high efficiency through many studies. However, Pole transformers with low capacity and voltage are in fact lacking research on high efficiency despite the fact that about 2.2 million units are installed nationwide. The purpose of this paper is to design the ultra-high efficiency pole transformer that changes the core and winding materials and it - xii - reduces the eddy current loss of the winding and other structures for the 100kVA high efficiency pole transformer. In order to analyze the advanced technology, we analyzed overseas 100kVA high efficiency pole transformer and examined the technologies necessary for product development. In addition, The eddy current loss of low voltage windings and high voltage windings was calculated using a finite element method, and the eddy current loss was reduced by changing the shape of conductor, winding arrangement, and insulating paper. In order to reduce the eddy current loss of other structures, the loss was reduced either by inserting a nonmagnetic material between the low voltage bushing terminals or by changing the shape and material of the clamp. Finally, The iron core and winding materials of transformers were designed by using an amorphous core and copper conductor to maximize efficiency, and the 100kVA ultra-high efficiency pole transformer was designed by improving the eddy current loss of the windings and other structures. In order to verify the design, a transformer with the same specifications as the design model was manufactured to validate the effect, and compared with a high efficiency pole transformer, an efficiency of 99.56%(50% load) with an efficiency increase of 0.29% was developed. The eddy current loss reduction studies presented in this paper are expected to be used as data necessary for the development of transformers with other capacities. The final developed 100kVA ultra-high efficiency pole transformer is expected to contribute to improving the efficiency of the domestic distribution system

LINK ORIGINAL: http://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=87c33062fa1d9da7ffe0bdc3ef48d419

LINK: http://www.mediafire.com/file/5z8z65z43a031c9/Design_of_100kVA_Ultra-High_efficiency.pdf/file