Improved bridge type inrush current limiter for primary grounded transformers

This paper presents a new method for suppression of the transformer inrush current of primary grounded transformers. A newly designed diode-bridge in a neutral winding transformer controls the inrush current using simple power circuit topology without any control or gate drive circuits or measurement tools. Since the number of diodes in this design has been minimized, the ripple and electrical losses decrease while operational reliability increases. The proposed method has been evaluated in laboratory tests and computer simulations. The good agreement of experimental and simulation results verifies the effectiveness of this method.

► We propose a new method for suppression of transformer inrush current.
► The required inductance value in this design has been reduced.
► The number of diodes in this design has been minimized.
► Microcontroller (PIC 16F628) has been used to switch transformer on desired angle.