2017 IEEE Holm Conference on Electrical Contacts最新文献_第5页

Comparison of spherical and axisymmetric models of electrical contact heating and the conditions of their application 电接触加热的球面模型与轴对称模型的比较及其应用条件

2017 IEEE Holm Conference on Electrical Contacts Pub Date : 2017-09-01 DOI: 10.1109/HOLM.2017.8088062

S. Kharin

引用次数: 1

Investigation on the electrical properties of AgNi contact materials with various Ni content 不同镍含量AgNi触点材料电学性能的研究

2017 IEEE Holm Conference on Electrical Contacts Pub Date : 2017-09-01 DOI: 10.1109/HOLM.2017.8088090

Heng Wang, Huan Yuan

引用次数: 2

Research on the distribution thermal FEM model for an enclosed isolated phase bus-bar in short-circuit condition 封闭隔离相母线短路时分布热有限元模型研究

2017 IEEE Holm Conference on Electrical Contacts Pub Date : 2017-09-01 DOI: 10.1109/HOLM.2017.8088063

Huimin Liang, Ruichao Wang, L. Bao, Hongjian Wang, J. You

引用次数: 2

An exploratory study of silver nanoparticle laden lubricants for electrical contacts 载银纳米颗粒电触点润滑剂的探索性研究

2017 IEEE Holm Conference on Electrical Contacts Pub Date : 2017-09-01 DOI: 10.1109/HOLM.2017.8088074

R. Jackson, A. B. Coker, Z. Tucker, M. S. Hossain, G. Mills

{"title":"An exploratory study of silver nanoparticle laden lubricants for electrical contacts","authors":"R. Jackson, A. B. Coker, Z. Tucker, M. S. Hossain, G. Mills","doi":"10.1109/HOLM.2017.8088074","DOIUrl":"https://doi.org/10.1109/HOLM.2017.8088074","url":null,"abstract":"Electrical contacts are critically important for a wide variety of applications, including computing, automotive, manufacturing, and renewable energy technologies. Due to a combination of vibrations and environmental conditions, these contacts are often susceptible to fretting corrosion and other wear mechanisms. In many cases it is not possible to design a stable dry contact system that is also within cost restraints. Therefore lubricants are often employed. Liquid lubricants can reduce wear but cause problems due to the non-conductive nature of typical lubricants. If a film develops between the surfaces due to tribofilm formation, lubricant degradation, or hydrodynamic lift, this can result in an increase in the electrical contact resistance. Fairly recently researchers have explored the use of nanoparticles to enhance the friction and wear properties of lubricants. Some of the nanoparticles are metallic and could also improve the conductivity of the lubricant within an electrical contact. In this work, the performance of silver nanoparticle laden dodecane lubricants are observed relative to pure dodecane and ZDDP enhanced dodecane. These results suggest that the nanoparticles do produce a reduced and more stable contact resistance, while also reducing friction and wear.","PeriodicalId":354484,"journal":{"name":"2017 IEEE Holm Conference on Electrical Contacts","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123722530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The effect of the distribution of α-spots in the peripheral part of an apparent contact point on constriction resistance α-斑点在表观接触点外围部分的分布对收缩阻力的影响

2017 IEEE Holm Conference on Electrical Contacts Pub Date : 2017-09-01 DOI: 10.1109/HOLM.2017.8088103

Y. Fukuyama, Norihiko Sakamoto, N. Kaneko, T. Kondo, J. Toyoizumi, T. Yudate

{"title":"The effect of the distribution of α-spots in the peripheral part of an apparent contact point on constriction resistance","authors":"Y. Fukuyama, Norihiko Sakamoto, N. Kaneko, T. Kondo, J. Toyoizumi, T. Yudate","doi":"10.1109/HOLM.2017.8088103","DOIUrl":"https://doi.org/10.1109/HOLM.2017.8088103","url":null,"abstract":"The constriction resistance resulting from the constriction of current flow is one of main components in the contact resistance of electrical contacts in connectors. When the current flow has a round-shaped section as a contact point, the constriction resistance can be calculated analytically; however, this is not the case for real contacts. In the apparent contact point between two electrodes, there are many real contact points called a-spots. Even in the apparent contact point, there is no current flow in other part than the a-spots. Thus, the area of apparent contact point is not equal to the total area of a-spots and its constriction resistance cannot be calculated. From some previous studies, it is suggested that the constriction resistance of the contact with a-spots concentrated on a peripheral part of its apparent contact point is lower than that of the other if the total area of a-spots is constant. We fabricated some contact-like-structures on Si chips with various distributions of \"a-spots\" along the peripheral part of their \"apparent contact point\" using nanofabrication technology and compared their constriction resistances with each other for examining the relation between the distribution of a-spots and constriction resistance. Our simplified samples have shown resistance values between the calculation results using the Holm's equation and the Greenwood's equation.","PeriodicalId":354484,"journal":{"name":"2017 IEEE Holm Conference on Electrical Contacts","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129552806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

The influence of multiscale surface roughness on contact mechanics using finite element modeling: Applied to a Au-coated CNT composite electrical contact surface 基于有限元建模的多尺度表面粗糙度对接触力学的影响:应用于镀金碳纳米管复合材料电接触表面

2017 IEEE Holm Conference on Electrical Contacts Pub Date : 2017-09-01 DOI: 10.1109/HOLM.2017.8088092

Hong Liu, J. McBride

引用次数: 4

Study on molten bridge behaviors with arc-less current commutation in a hybrid DC circuit breaker 混合式直流断路器无弧换流熔桥特性研究

2017 IEEE Holm Conference on Electrical Contacts Pub Date : 2017-09-01 DOI: 10.1109/HOLM.2017.8088060

Mo Chen, Yuta Yamada, S. Zen, K. Yasuoka

{"title":"Study on molten bridge behaviors with arc-less current commutation in a hybrid DC circuit breaker","authors":"Mo Chen, Yuta Yamada, S. Zen, K. Yasuoka","doi":"10.1109/HOLM.2017.8088060","DOIUrl":"https://doi.org/10.1109/HOLM.2017.8088060","url":null,"abstract":"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 established based on a SiC-MOSFET which enables it possible to commutate current just in the molten-bridge stage. Thus an arc-less commutation is achieved. In this paper, firstly the influence of commutation on molten bridge is studied by comparing the molten bridge behaviors with and without current commutation when load is 60 V/150 A. And then, it is investigated how current value, separation speed and contact materials affect molten bridge performances in commutation condition. The experiments are carried out by using Cu and W contacts in open air when current is increased from 50 A to 200 A and the separation speed ranges from 0.04 m/s to 0.16 m/s. The results of this paper are meaningful for the optimization of this arc-less commutation hybrid DCCB.","PeriodicalId":354484,"journal":{"name":"2017 IEEE Holm Conference on Electrical Contacts","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127144861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

The failure mechanism of electromagnetic relay in accelerated storage degradation testing 电磁继电器在加速存储退化试验中的失效机理

2017 IEEE Holm Conference on Electrical Contacts Pub Date : 2017-09-01 DOI: 10.1109/HOLM.2017.8088080

Zhao-Bin Wang, Zhoulin Huang, Jiawei Wang, Shang Shang, G. Zhai

引用次数: 7

The impact on current density and constriction resistance from bridge structures in real contacts 实际接触中桥梁结构对电流密度和收缩阻力的影响

2017 IEEE Holm Conference on Electrical Contacts Pub Date : 2017-09-01 DOI: 10.1109/HOLM.2017.8088064

R. Malucci

引用次数: 3

Fretting behaviour of tinned connectors under grease lubrication 润滑脂润滑下锡连接器的微动特性

2017 IEEE Holm Conference on Electrical Contacts Pub Date : 2017-09-01 DOI: 10.1109/HOLM.2017.8088072

S. Noël, A. Brézard‐Oudot, P. Chrétien, D. Alamarguy

{"title":"Fretting behaviour of tinned connectors under grease lubrication","authors":"S. Noël, A. Brézard‐Oudot, P. Chrétien, D. Alamarguy","doi":"10.1109/HOLM.2017.8088072","DOIUrl":"https://doi.org/10.1109/HOLM.2017.8088072","url":null,"abstract":"Fretting is a well known phenomena due to unwanted micro displacements leading to drastic electrical contact resistance increase. Much work has been done to understand and evaluate the critical parameters in view of finding solutions to alleviate the problem. Several paths have been proposed involving for example connector design and surface modification. The simplest surface modification process is depositing an organic thin film with specific properties. The effect of liquid lubricants on fretting of electrical contacts has been well studied and the lubrication efficiency has been shown to depend on the degradation modes of the contacts which involve the nature and type of metallic surface (Au, Ni, Sn, Ag, plating thickness). Another type of lubrication involves semi liquid films such as greases. While much work has been done on the effect of greases on the fretting-wear of mechanical devices, less has been devoted to electrical contacts. In such field the grease films must also maintain a low electrical resistance for durations corresponding to field service. The work presented here was performed with a standard fretting device imposing controlled constant amplitude sine vibrations under constant normal load to pin on flat tinned contacts. This laboratory test allows comparing the behaviour of different types of greases for a given set of experimental conditions. Different commercial greases are compared involving different thickeners and different base oils. Tests at room temperature show little variations in the electrical behaviour of the grease coated contacts. Nevertheless wear particles dispersion seems to vary. A very high increase of contact resistance is observed in some cases after heat treatment 10 days at 150°C. Polymerization was observed to occur with one of the formulations and it is suggested that the base oil/thickener choice might be unfavourable to contact application.","PeriodicalId":354484,"journal":{"name":"2017 IEEE Holm Conference on Electrical Contacts","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126074821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5