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In many industrial applications like automotive, aeronautics, train but also nuclear energy connectors need to maintain low stable electrical contact resistance. However, they are subject to vibrations that cause severe fretting wear damage which increases the electrical contact resistance and degrades information transmission. Fretting wear damages can induce dramatic increase of the direct current...
This paper presents a method to simulate the current and voltage of an electric arc initiated at the contact's opening in a contactor. Based on a simplified model of the electric arc and also on the dynamics of the contacts during the opening, this method allows to simulate the arc ignition as well as the arc extinction. This study is based on the hypothesis that the arc dynamic is much faster than...
High technology domains such as aerospace, aviation and defense require a reliable transmission of RF signals. In these applications, RF connectors are exposed to severe environmental vibrations and are subjected to fretting wear damages. Former investigations on real connectors have shown that fretting wear leads to a dramatic increase of the DC electrical contact resistance (ECR), degrades RF microwave...
ITER is a large scale fusion experimental device under construction in Cadarache (France) intended to prove the viability of fusion as an energy source. Ion Cyclotron Resonance Heating (ICRH) system is one of the three heating systems which will supply total heating power of 20 MW (40-55 MHz) up to one hour of operation. Radio-Frequency (RF) contacts are integrated within the antennas for assembly...
Hybrid DC circuit breaker (HDCCB), which combines a mechanical switch and a semiconductor, has become a research focus due to a rapid development of DC power system and its low on-state loss and short break time. However, there is still serious arc erosion for a conventional HDCCB because the current commutation is driven by the arc. A novel topology of HDCCB was proposed in former research. It is...
Electrical equipment has to carry the rated normal current and short time withstand current. As shown in previous publications, the voltage-temperature relation allows calculating the temperature of contact elements and connectors for steady- state operating points. In the case of transient electric-thermal load, a finite-element analysis (FEA) is required to calculate the time-dependent distribution...
Two mathematical models, spherical and axisymmetric, describing the temperature field in closed electrical contacts are compared and the rightness of their application is discussed. The ranges of the contact radius, time and current are determined for which one or another model could be applied with the required accuracy. The temperature field in the axisymmetric model is found in the form of alternative...
As the first power transmission part of synchronous generator output, the thermal stability of the enclosed isolated phase bus-bar (EIPB) is important for the working safety of the power system. The thermal stability of large synchronous generator-side EIPB is hard to be analyzed or calculated because of the complex structure and the large size of EIPB in the power system. In this paper, a new co-simulation...
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