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Reverse engineering of Voltage Limiting Devices in 1500 V DC Railway Lines through transient transmission line modeling
Achraf DSOUL, Clement REBOUL
SNCF RESEAU, France
Voltage Limiting Devices are used to protect from short-circuits in DC railway lines. These switch devices should be correctly sized because their use is mandatory in order to ensure the security of the personnel and the system. For this reason we have to elaborate an adequate model of the 1500 V DC railway lines in transient mode. In this work, we describe how this model was built using PSIM software and the multi-conductors method.
The Effect of a Bend on the Stochastic-Field Coupling to a Single Wire Transmission Line Over a Conductive Ground Plane
Johanna Kasper, Ralf Vick
Otto von Guericke University Magdeburg, Germany
The classical transmission line theory does not take not into account the variations in the parameters of a transmission line or any change in its uniform properties as well as the influence on coupling of not straight, e.g. bent wires.
In this paper, a theory is derived which uses simple position dependent per-unit-length parameters to account to these effects. The theoretical problem of a bend on a single wire transmission line is analyzed based on the wave equations and the solution of the Green's functions.
The model is validated against a simulation model based on the method of moments. Moreover, the new model is compared to an already existing simulation model based on the BLT equations (named after Baum-Liu-Tesche) for the field-to-wire coupling of a stochastic field to transmission line networks, which does not take into account the coupling between the lines.
Time-Frequency analysis for wiring soft faults detection
Time-Frequency signal analysis represents the function in both time and frequency domains by the calculation of the spectrum at regular intervals of time. Moreover, Time- Frequency analysis is based on Fourier Transform. There are several Time–Frequency distribution functions such as Short- Time Fourier Transform (STFT), Continuous Wavelet Transform (CWT), and Wigner Ville Transform (WVT). This article focuses on chafed faults detection by using STFT, CWT, and WVT. Finally, a comparison of these approaches’ performances is made.
Multi-Objective Design of Transmission Line Referenced to Meshed Ground Planes by Preference Set-based Design
Koki Matsuishi, Yoshiki Kayano, Fengchao Xiao, Yoshio Kami
The University of Electro-Communications, Japan
In the design of transmission line, sometimes it is required to pursue a solution which satisfies simultaneously multi-objective (electrical, mechanical, and thermal) performances even including conflicting requirements. This paper newly attempts to propose a multi-objective satisfactory design method, Preference Set-Based Design (PSD), to the design of a transmission line referenced to a meshed ground plane. This work demonstrates that PSD method is applicable for multi-objective design of transmission line from the viewpoint of SI and EMI performances. The design parameters of a simple transmission line referenced to the meshed ground plane, which satisfy required performance, are obtained successfully in ranges by PSD. The validity of the proposed method is demonstrated.