Abstract

In this paper, an analysis of magnetic field generated by a complex MV-L V substation and the application of 3 suitable shielding techniques are presented. The substation consists of 19 transformers with rated power ranging from 1600 up to 2500 kVA, and it is built near a datacenter which allows a maximum magnetic flux density value of 1 μT. Firstly, a base case of an usual installation of the substation is analyzed, in order to calculate the magnetic flux density generated. At this regard, an integral 3D model of the magnetic field has been arranged for each device in the substation: MV /L V transformer, MV and L V switchgears, power lines. Therefore, 3 shielding techniques are proposed and implemented: the transposition of transformers, the transposition of conductors, the installation of multi-layer shielding plates on walls. First two methods consists on the optimization of the arrangement of transformers and conductors in the substation according to installation requirements, the last method is based on the conductive and ferromagnetic shielding effect of multi-layer plates installed on the walls of the substation, in order to achieve a mitigation in the external environment. Finally, some measures of magnetic flux density on the real substation which implements the 3 techniques are performed, in order to estimate the shielding factor with respect to the base case.

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