Abstract
This paper presents an analytical interpretation of electromagnetic interference between solid-bottom type open cable trays in a nuclear power plant under the assumption that an electric-line current is undesirably generated from a damaged cable in an open cable tray. Based on the superposition principle and Helmholtz's equation in conjunction with the separation of variables, we employ a mode-matching method to obtain analytical solutions to the postulated electromagnetic interference problem. Before conducting a mode-matching analysis, we investigate the radiating principle of the electric field interfering with a victim cable tray by deriving the array factor in consideration of an imaginary electric-line current. In addition, we characterize the electric fields with a propagating mode at an observation point in the victim cable tray using the derived expression of the electric field. Based on this, we validate the formulation and computation of our mode-matching method and then computationally investigate the strength and distribution of interfering electric fields in terms of the separation distances provided in regulatory guidance on the electrical independence of a nuclear power plant. Finally, we compute the strength and distribution of the interfering electric field at the observation point when the location of an electric-line current is modified. The results of the study provide us with the useful information to alleviate the electromagnetic interference between open cable trays in a nuclear power plant.
Highlights
Cable trays have been employed to protect and isolate power and communication cables from physical, electromagnetic (EM), and fire damage in industrial facilities such as nuclear power plants
While an open-type cable tray has the advantages of low fabrication costs and structural simplicity, it inevitably retains its vulnerability to external damage such as EM interference (EMI); The associate editor coordinating the review of this manuscript and approving it for publication was Mehmet Alper Uslu
This paper presents an analytical interpretation of the electromagnetic interference between open cable trays of solid-bottom type in a nuclear power plant, under the assumption that an electric-line current is undesirably generated from a damaged cable in an open cable tray
Summary
Cable trays have been employed to protect and isolate power and communication cables from physical, electromagnetic (EM), and fire damage in industrial facilities such as nuclear power plants. In this study, we conduct a mode-matching analysis on the EMI between open cable trays in a nuclear power plant. Open cable trays through an EM analysis can aid in deciding whether a shielding cover should be applied With this as our motivation, we analyze the EMI between open cable trays of a solid-bottom type in an indoor environment of a nuclear power plant.
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