Investigation of the Optimal Dimension and Location of Horizontal Shunts in Transformers with Parametrical Finite Element Analyses

Magnetic shunting is an efficient way to reduce stray losses in transformer tank walls. Due to the vertical placement of these shunts inside the tank walls are greatly reduce these losses, this method are widely used by transformer manufacturers. In this study, authors are focused on horizontal shunting method and optimal dimensions and locations of these shunts are investigated. A 1250kVA high efficient distribution transformer is studied. First, stray losses on tank walls were calculated by simulations and obtained results were verified by measurements. Then, a number of analyses were conducted parametrically to obtain the optimal position and dimensions of the horizontal shunts. Analysis results show that, considering the other important issues such as cooling efficiency of tank walls, stray losses on tank walls are reduced by 80%