ABSTRACT
One of the most effective methods to tackle harmful thermal and power loss effects of big concentrations of leakage fields, affecting constructional elements of electric machines and power equipment, is electromagnetic and magnetic screening (shunting). From the point of view of applications, the screens can be divided into electrostatic, magnetic, and electromagnetic. From the point of view of screening effectiveness, most screens can be divided into closed, open, or half-closed for magnetic or electromagnetic field. The theory and practice of screening in some cases requires renewed elaboration for the need of building and testing of large power apparatus. Measurement apparatus and other small devices can be screened from external magnetic fields, and contrariwise, with the help of closed housings made of magnetic material. In power transformers, more often than crosswise screens, longitudinal magnetic screens are used along the lines of the magnetic field.
