Because of ferromagnetic elements, magnetic induction B and magnetic field H is non-linear, which is the main cause that high inrush current occur during the transformer energisation.

• 由于变压器铁磁材料的作用，磁感应强度B和磁场强度H呈非线性关系，这也是变压器空载合闸时产生较大励磁涌流的主要原因。