Amin Khodadadi - Expert in repair and maintenance of lines of Arman Niro Hormozgan company
Sara Adinehpour - Business manager of Arman Niro Hormozgan company

Iranian ۴۰۰kV auto transformer taps are provided on ۲۲۰kV side series winding. The tapping lead take out from inside ۲۲۰kV tap winding is big challenge for transformer design. In this paper present a new design of auto transformer with neutral end tapping for better reliability and economy. According to technical and economic comparition and analysis

auto transformer; wave process; neutral end tapping