Analysis on eccentric bus-bar testing method of heavy current transformer

For testing the reliability of heavy current transformer (HCTs) with shielding coils affected by the adjacent bus bars, an equivalent testing method called eccentric bus-bar testing method was presented in [1]. The crucial parameters of this method were also determined by analytical formulas and further verified by finite element method (FEM) in [1]. This paper presents several experiments and analytical formulas on this testing method, which reveal a basic flaw of this method. Furthermore, the practical applicability of this equivalent testing method is analyzed.