Magnetic field analysis of solid insulation generator enclosed bus with amorphous alloy shielding layer

Magnetic shielding scheme of enclosed bus is a key problem in hydroelectric design fields. In this paper, amorphous alloy is used as magnetic shielding material of a 10.5 kV 5 kA hydropower generator bus. By comparison with magnetic field analysis of copper, the effect and advantages of amorphous alloy shielding material is discussed. The finite element analysis shows, as to lower frequency magnetic shielding, amorphous alloy can brings less residual magnetic field in outside air of conductors and bus coat. Furthermore, the relationship between thickness of shielding layer and shielding effect is researched, and the results suggest 5 mm should be optimal thickness of this hydroelectric enclosed tube bus.