การวิเคราะห์และออกแบบหม้อแปลงไฟฟ้าที่ใช้ในระบบจำหน่ายให้มีความสามารถทนกระแสลัดวงจร

Abstract

This article presents the study and analysis of the distribution transformer design for short circuit withstand capability follow to IEC standard. In this study, the analysis of loading and short circuit oil immersed distribution transformer and to improve the design of the transformer can be short circuit withstand.  In the research, the 400 kVA 3-phase 50 Hz 22000-400/230 V Dyn11 transformer has been designed and tested to measure and approximate the temperature of the transformer during short circuit the hottest spot temperature of the winding after a short circuit, the short circuit current, short circuit duration and short circuit forces. Which enabling designers to find a weak spot in the design and select a proper raw materials, such as winding size, insulation thickness and properties of the silicon steel for a better quality of distribution transformer production.