Analysis and Evaluation of Tested Result and Design of Distribution Transformer for Improving Short Circuit Withstand Capability

Abstract

This research presents the analysis and evaluation of transformer design for short circuit withstand capability as required by the PEA standard. The tested results at rated load of distribution transformer, 250 kVA 3 ph 50 Hz 22000-400/230 V Dyn11, and manufacturing guidelines while loading of distribution transformer,  250 kVA 3 ph 50 Hz 22000-400/ 230 V Dyn11, and manufacturing guidelines were calculated as the data to analyze and to find out the winding temperature, the final temperature after the short circuit, short circuit current, short circuit duration and short circuit forces analysis. This analysis and evaluation is based on the design of distribution transformer, according to the PEA standard. This result is used as a reference for design the distribution transformer in next time and for designers to find out the defects in the design and to select of raw materials, such as wire size, insulation thickness, and the properties of the silicon steel that used in the production. This will approve the better performance of designing transformer and short circuit withstand capability as required by the standard. The results of the analysis and information are very useful as the essential data for designing and analysis of the transformer design in the future as well.