2018 IEEE Holm Conference on Electrical Contacts

14-18 Oct. 2018

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  • [Front cover]

    Publication Year: 2018, Page(s): c1
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  • [Front cover]

    Publication Year: 2018, Page(s): c1
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  • [Title page]

    Publication Year: 2018, Page(s): i
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  • [Copyright notice]

    Publication Year: 2018, Page(s): i
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  • Holm 2018 Foreword

    Publication Year: 2018, Page(s): xv
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  • Holm 2018 Committee

    Publication Year: 2018, Page(s):iv - v
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  • The Morton Antler Lecture

    Publication Year: 2018, Page(s):i - ii
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  • The Earle Shobert Prize Paper Award

    Publication Year: 2018, Page(s):xviii - xxi
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  • The Armington Recognition Award

    Publication Year: 2018, Page(s): xxii
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  • The Paul and Dee Dee Slade Young Investigator Award

    Publication Year: 2018, Page(s): xxiii
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  • Sponsors

    Publication Year: 2018, Page(s): iii
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  • Table of contents

    Publication Year: 2018, Page(s):i - viii
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  • Investigations on the Effects of Different Strand Surface Conditions on the Inter Strand and Strand/Connector Resistance

    Publication Year: 2018, Page(s):1 - 8
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    The basic function of wire connection systems is to assure a low loss and stable long term electromechanical connection between the wire and connector. In order to meet the increasing demands of this function, it is necessary to provide a sufficient electromechanical inter strand and strand/connector contact. An important parameter for this is the strand surface condition. The strand surface condi... View full abstract»

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  • The Impact of Coating Materials in Coaxial Connectors on Passive Intermodulation

    Publication Year: 2018, Page(s):9 - 16
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    Passive intermodulation (PIM) induced by coaxial connectors negatively impacts communication quality. The properties of the coating materials alter PIM performance. Accordingly, a better understanding of the influence of the coating materials for coaxial connectors on PIM is of substantial value. In the present work, the effects of coating materials on the PIM performance was investigated through ... View full abstract»

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  • The Influence of Contaminated Copper Wires on the DC Joule Heating of Connectors

    Publication Year: 2018, Page(s):17 - 23
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    The production process of wires involves different processing agents which can lead to a contamination of the conductor surface. As a result the contact resistance and Joule heating may increase. In contrast to bulk wires stranded wires have many inner contact points, wherefore contaminations are especially critical. In this work contaminations on wires are investigated with optical light spectros... View full abstract»

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  • Theoretical and Experimental Work on Optimal Contact Geometries on Fast Mechanical Disconnect Switches

    Publication Year: 2018, Page(s):24 - 30
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1033 KB) | HTML iconHTML

    Fast mechanical disconnect switches (FMS) are an integral part of hybrid circuit breakers, which are proposed as protection devices to clear faults in medium voltage distribution systems. The proposed FMS is a vacuum switch that is operated by an amplified piezoelectric actuator. Such actuators enable unprecedented speed and contact separation in less than one millisecond. The limitations that com... View full abstract»

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  • Improved Microcontact Test Fixture for Efficient Reliability and Performance Characterization

    Publication Year: 2018, Page(s):31 - 37
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (765 KB) | HTML iconHTML

    In Microelectromechanical systems (MEMS) switches, the microcontact plays a crucial role in determining reliability and performance. Microcontact test fixtures facilitate to study micro contact surface physics, contact resistance, contact force, adhesion, and contamination research associated with microcontacts. Although AFM, SPM, and Nanoindentation based microcontact test setups are excellent at... View full abstract»

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  • The Model of Melting and Welding of Closed Electrical Contacts with Softening Contact Zone

    Publication Year: 2018, Page(s):38 - 42
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (136 KB) | HTML iconHTML

    Dynamics of melting and welding of closed electrical contacts is analyzed for ac current half-wave. It is shown that in the range of low current and contact load the spherical model introduced by R. Holm describes satisfactorily the contact heating. The special attention is focused on the influence of softening of contact material on the current density and temperature field. All consecutive stage... View full abstract»

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  • The Effects of Bridge Structures on Current Density and Temperature Distributions

    Publication Year: 2018, Page(s):43 - 47
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    In earlier work [1, 2] it was shown that bridge structures adjacent to contact spots effect current density distributions. Specifically, it was shown that the current density at the edge of contact spots is finite as compared to infinite results for the ideal co-planar cases which are often used in estimating contact resistance. In the former case, hyperbolic bridge structures were used to demonst... View full abstract»

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  • A Multiphysics Coupled Electro-thermo-mechanical Model of Whisker Shorting

    Publication Year: 2018, Page(s):48 - 55
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    This work considers the behavior of a metallic whisker as it is causing a short circuit. This is achieved by using a coupled electro-thermo-mechanical numerical model (i.e. multiphysics finite elements). The shorted current passing through the whisker will cause it to heat and the temperature to rise. The temperature rise can cause the whisker to soften and stresses to grow. Eventually this could ... View full abstract»

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  • 3-D Hydrodynamic Model of Metal Droplet Sputtering and Molten Pool Formation Under Electric Arc

    Publication Year: 2018, Page(s):56 - 60
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    Material erosion caused by the molten metal liquid droplet ejection is one of the serious problem for contacts used in heavy and medium load conditions. To understand the complex nature of the metal droplet sputtering and molten pool formation under electric arc, a 3-D hydrodynamic model has been developed to describe the formation process of molten metal liquid drop edge ejection and molten pool ... View full abstract»

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  • Modeling of the Friction Force in Sliding Electrical Contact with Mining Rules

    Publication Year: 2018, Page(s):61 - 65
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (139 KB) | HTML iconHTML

    In high speed current sliding electrical contact, the friction force between the contact surfaces directly reflects the reliability of electrical contact. Based on the experimental data analysis of the sliding electric contact machine, a kind of rules model of the sliding electrical contact friction force under fluctuating load is established using method of data mining. Firstly, some different ru... View full abstract»

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  • Parameter Estimation of Black Box Arc Model based on Heuristic Optimization Algorithms

    Publication Year: 2018, Page(s):66 - 70
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (631 KB) | HTML iconHTML

    The black box arc model is suitable to describe the arcing process of hybrid circuit breaker, since it provides an effective way to integrate the arc model into an electrical circuit. However, it is more difficult to determine the parameters of the arc model according to the performance of circuit breaker than to solve the analytical equations of arc model. A library of arc models including Mayr, ... View full abstract»

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  • Welding in Break and Make Operations for CuMo and CuW Contact Materials in DC200–500V and Different Surrounding Gases

    Publication Year: 2018, Page(s):71 - 76
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    Hermetically sealed electromagnetic relays or contactors with high DC switching capacity, smaller size and longer lifespan are getting more and more important nowadays due to rapid developments of renewable energy installations and electrical vehicles. However, reports on contact welding resistances, arc durations and other related characteristics in DC200-1000VDC load ranges are quite few. In thi... View full abstract»

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  • Effect of contact velocity on the behaviour of decaying arcs in air

    Publication Year: 2018, Page(s):77 - 80
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (4540 KB) | HTML iconHTML

    Hybrid direct current circuit breaker (HDCCB) consists of an ultra-fast electromechanical switch combined with power semiconductors to interrupt fault currents. When the ultra-fast electromechanical switch opens, arc plasma is generated between its contacts that commutate the fault current to the auxiliary circuit consisting of power semiconductors. Understanding of the arc behaviour due to the ul... View full abstract»

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