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
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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
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