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The effect of Electric Fast Transients (EFT) phenomena in an Ethernet interface set-up is investigated in order to get more insight in coupling and interference mechanisms, robustness and susceptibility levels of a typical Ethernet installation on board of a naval vessel. It is shown that already a small EFT pulse is capable of disturbing or disrupting Ethernet communication at protocol level, which...
This paper deals with the TEM cross-correlation method (TCCM) to qualify and characterize transverse electromagnetic (TEM) waveguides for arbitrary transient signals. In previous papers the applicability of the TCCM to waveguides was shown. The aim of this investigation is to apply the established limits of the various standards (e.g. the IEC 61000–4–20 Annex C) to this new method and determine the...
As one consequence of the increasing grade in electrification of vehicle powertrains the electromagnetic interference (EMI) potential of these components becomes increasingly relevant. The conducted disturbances caused by high-voltage (HV) and high-energy pulses originating from the DC/AC-inverter have to be analyzed, as they can easily couple from the HV-DC traction-network to the low-voltage (LV)...
In a reverberation chamber high field strengths can be generated with comparatively low input power. This makes them suitable for EMC testing with pulsed signals where field strengths of up to 600 V/m are common. It has been shown that due to the reverberant nature of such chambers high transient field strengths are possible. Transient peaks much higher than the stationary field have been encountered...
Shielding of electromagnetic transient fields requires a correct vision of the coupling mechanism and of fundamental aspects of victim functionality and susceptibility. Suitable parameters for the measure of the shielding efficiency are necessary in case of typical transient fields like ESD and classical the information provided by the shielding effectiveness as defined in IEEE-Std.299 may be not...
In this paper a method combining different types of simulation is used to evaluate transient interferences over a digital communication system at its frequency band. The method combines different simulation stages; the first one is an electromagnetic simulation, with FDTD numerical method, which is carried out to establish the level of the interference coupled to the digital communication system;...
This paper deals with the analysis of the transient disturbances produced above of a train by the pantograph-catenary power supply system. The goal is to study the contribution of the different elements of the train and the infrastructure on the electromagnetic disturbances which are received by communication antennas presents on the roof of the trains. A train simulation model is performed in order...
We present a comparison of six models representing the frequency dependence of soil electrical conductivity and permittivity, applied to the analysis of a horizontal grounding electrode subjected to typical first and subsequent lightning return stroke current. A full-wave computational model is adopted for the analysis, which is based on the antenna theory. It is shown that models by Scott, Smith-Longmire,...
In new Aircraft, fuselage structure offer less efficient protection against lightning strikes hence this higher level of lightning constraints has to be withstanding by equipment. These constraints drastically increase the size and weight of protection parts regarding traditional protection solution. This document describes a new solution for avionics equipment lightning protection in order to optimize...
A novel surge protection device is investigated for lightning surge protection of electronic equipment embedded in composite material aircraft. The device employs silicon carbide depletion mode junction field effect transistors for current limiting.
Railway power supply and pipelines are often close to each other and in case of a strong parallelism, an induced voltage can appear on the overground metallic part of the gas equipment. The value of the induced voltage depends of many parameters such as the power line and the pipeline vicinity, the supply current, the ground characteristics and the parallelism between these two infrastructures. The...
A predictive time-domain (TD) analysis of near-field (NF) coupling for complex shape wiring system is reported. Based on the Taylor model, methodological approach enabling to determine the transient voltage coupling induced by electromagnetic (EM) near-field action on the metallic wiring structure is presented. The basic steps indicating how the coupling time-dependent voltages were calculated are...
In EMC testing of medical devices the risk assessment is a subject of great importance and is a rather new topic. Unfortunately no much experience exists on this subject. This paper presents an approach which has been used in the risk assessment of IVD (In Vitro Diagnostic) medical devices. We show how the risk can be assessed in a probabilistic manner proposing a procedure applicable to both steady...
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