Experimental Study on Arcing Effects to Contact Materials in 270V dc

Zhu, Qingcheng; Li, Z. B.; Ji, Wei; Liu, Z. X.; Huang, Jiang; Zhang, D. D.; Hasegawa, Makoto

doi:10.14311/ppt.2017.1.61

PPT

2017

DOI: 10.14311/ppt.2017.1.61

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Experimental Study on Arcing Effects to Contact Materials in 270V dc

Qingcheng Zhu

Z. B. Li

Wei Ji

et al.

Abstract: Abstract. As supply DC voltage levels in automobiles, aviation and aerospace are becoming higher, high voltage and large capacity compact DC electromagnetic relays or contactors are becoming more important. In this paper, experiments were conducted at DC 270V/100A in air and nitrogen, respectively, with CuCr40, CuCr45, CuCr50, CuW60, CuW70 and CuW90 as contact materials. Welding resistance (corresponding to electrical contact life), contact erosion and breaking arc durations were measured, and the obtained res… Show more

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2020

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Effect of Surrounding Atmospheres on Break Arc Durations of Electrical Contacts in DC Load Conditions

Zhang

et al. 2020

IEICE Trans. Electron.

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Shun IMAI † , Nonmember and Akihiro INOKUCHI †a) , Member SUMMARY This paper proposes a method for searching for graphs in the database which are contained as subgraphs by a given query. In the proposed method, the search index does not require any knowledge of the query set or the frequent subgraph patterns. In conventional techniques, enumerating and selecting frequent subgraph patterns is computationally expensive, and the distribution of the query set must be known in advance. Subsequent changes to the query set require the frequent patterns to be selected again and the index to be reconstructed. The proposed method overcomes these difficulties through graph coding, using a tree structured index that contains infrequent subgraph patterns in the shallow part of the tree. By traversing this code tree, we are able to rapidly determine whether multiple graphs in the database contain subgraphs that match the query, producing a powerful pruning or filtering effect. Furthermore, the filtering and verification steps of the graph search can be conducted concurrently, rather than requiring separate algorithms. As the proposed method does not require the frequent subgraph patterns and the query set, it is significantly faster than previous techniques; this independence from the query set also means that there is no need to reconstruct the search index when the query set changes. A series of experiments using a real-world dataset demonstrate the efficiency of the proposed method, achieving a search speed several orders of magnitude faster than the previous best.

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Effect of Surrounding Atmospheres on Break Arc Durations of Electrical Contacts in DC Load Conditions

Zhang

et al. 2020

IEICE Trans. Electron.

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show abstract

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Experimental Study on Arcing Effects to Contact Materials in 270V dc

Cited by 1 publication

References 6 publications

Effect of Surrounding Atmospheres on Break Arc Durations of Electrical Contacts in DC Load Conditions

Effect of Surrounding Atmospheres on Break Arc Durations of Electrical Contacts in DC Load Conditions

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