Magnetic shielding of power plants in large facilities

Large metal plates are used to as shields against magnetic fields at power frequencies. These fields are found to emanate, as an example, from high power transformers and their associated low voltage cables. These plates are finite and their shielding is compromised due to their finite dimensions. This paper evaluates the shielding afforded by such a plate, as related to the geometry of the placement of the source and victim and the dimensions and structure of the shield plate.