The common-mode (CM) current phenomena is one of many problems in the EMC world due to the radiated magnetic field caused by it. A power transmission line with a delta-connection both generator and load normally do not have a connection to ground to establish a line for the return current. To determine the CM current, finding the stray capacitances to the ground is highly important because they are used as the return path for the CM current. In this paper, the investigation of predicting the CM current flowing through the stray capacitances will be done at a three-phase equivalent system of a wind turbine (WT). The wind turbine body is the place where the CM current flows, due to the stray capacitances between the power cables and the WT body around it. The CM current can be determined using the current magnitudes in a pointer-image method, which has a good agreement for CM current prediction and it might become a very useful tool applicable to measurements.
A larger deployment of power-electronic converters, with increasingly high switching frequencies, can be observed and associated with a higher complexity to achieve optimal performance not only on design, integration, reliability, and cost of power solutions but also on related electromagnetic compatibility measurements. Thus, a pulsed sensor calibration over the kHz range is desired to obtain significant results. This work presents a mathematical derivation of a transient compensation technique for current clamps based on transfer functions and time-domain waveforms. By converting the aperiodic signals of the probe using a Laplace transform, the method can be easily performed in the frequency domain, the original waveform in the line can be accurately predicted and correction factors for field sensors can be determined if needed.
This paper addresses a preliminary research on numerical simulation method of an double-layer shielded and low voltage power cable for electric vehicle powertrain using Finite Element Analysis (FEA) and Simulation Program with Integrated Circuit Emphasis (SPICE) as software tools. Simulating this detailed method through FEA for only one transmission line cell, it was obtained the transmission lines parameters and the magnetic flux density of the cable. Then, its length is extended by using transmission lines theory and the frequency response of the cable was gathered as an evaluation of the current method implemented in SPICE. Thus, those analyses can provide a faster and better overview concerning the prediction of cable's electromagnetic (EM) shielding behavior in order to avoid Electromagnetic Compatibility (EMC) compliance issues in the early-stage development of vehicles.
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