Reduction of Rotating Iron Loss on Three-phase Transformer Model Core Using Vector Magnetic Characteristic Control Technology

Abstract

　Due to energy issues in recent years, there has been a demand for energy-saving electrical machines, and transformers have been subject to the Top Runner System since 2006. Iron loss, which is one type of transformer loss, is caused by the iron core material, and it is known that the iron loss increases due to rotating magnetic flux that occurs especially around T-junctions. The authors have developed vector magnetic characteristic control technology that can reduce iron loss under rotating magnetic flux in existing grain-oriented electrical steel sheets, and have clarified guidelines for applying this technology to electrical equipment cores. This paper clarifies the application area of control technology for rotating iron loss occurring in a three-phase transformer model core based on vector magnetic characteristic analysis and the above-mentioned guidelines, and also applies it to an actual three-phase transformer model core and conducts actual measurements. We will investigate and report on the iron loss reduction effect.