Partial Core Power Transformer
Partial Core Power Transformer Ming Zhong, B.E.(Hons) A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering in Electrical and Computer Engineering at the University of Canterbury, Christchurch, New Zealand. April 2012 a b Abstract This thesis describes the design, construction, and testing of a 15kVA, 11kV/230V partial core power transformer (PCPT) for continuous operation. While applications for the partial core transformer have been developed for many years, the concept of constructing a partial core transformer, from conventional copper windings, as a power transformer has not been investigated, specifically to have a continuous operation. In this thesis, this concept has been investigated and tested. The first part of the research involved creating a computer program to model the physical dimensions and the electrical performance of a partial core transformer, based on the existing partial core transformer models. Also, since the hot-spot temperature is the key factor for limiting the power rating of the PCPT, the second part of the research investigates a thermal model to simulate the change of the hot-spot temperature for the designed PCPT. The cooling fluid of the PCPT applied in this project was BIOTEMP ®. The original thermal model used was from the IEEE Guide for Loading Mineral-Oil-Immersed transformer. However, some changes to the original thermal model had to be made since the original model does not include BIOTEMP ® as a type of cooling fluid. The constructed partial core transformer was tested to determine its hot-spot temperature when it is immersed by BIOTEMP ®, and the results compared with the thermal model.
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