Abstract
This paper describes the development of a magnetic-flux-control-type transformer (MFC transformer).
An on-load tap changing transformer and step voltage regulator is used as a conventional voltage-controller for distribution lines. But the response time for controlling the voltage is not satisfactory, and the voltage control is performed in discrete steps. An MFC transformer can control the output voltage and reactive power at high speed, and continuously, and its copper and iron composition gives it high endurance and reliability.
In this paper, we report on the basic structure of an MFC transformer, the control characteristics of a trial single-phase 30-kVA MFC transformer, and the outline of a three-phase 350-kVA prototype.
