Equivalent Modeling Method for the Frequency and Voltage Emergency Control Device Box

In order to address the problem of inaccurate calculation caused by the complexity of the computational modeling of the Frequency and voltage emergency control device box, according to the electromagnetic topology theory, an equivalent calculation method for the shielding effectiveness of the small hole size box is proposed. The array is equivalent to a single hole with the same area, and the size of the single hole is reduced according to the number of holes, and the relationship between the reduction ratio and the number of small holes is established. For the case of low frequency range, the accuracy of the equivalent algorithm is verified by changing the number of holes and the material of the shielding box. The results demonstrate that the equivalent analysis algorithm for the small hole array cannot only ensure the calculation more accurate, but also reduce the computational complexity to a certain extent. It serves as a reference for the design of the shielded casing of complex shielding box equipment.