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Titolo:
The unusual electrical erosion of high tungsten content, tungsten copper contacts switching load current in vacuum
Autore:
Slade, PG; Li, WP; Loud, LD; Haskins, RE;
Indirizzi:
Cutler Hammer Inc, Horseheads, NY 14845 USA Cutler Hammer Inc Horseheads NY USA 14845 r Inc, Horseheads, NY 14845 USA
Titolo Testata:
IEEE TRANSACTIONS ON COMPONENTS AND PACKAGING TECHNOLOGIES
fascicolo: 3, volume: 24, anno: 2001,
pagine: 320 - 330
SICI:
1521-3331(200109)24:3<320:TUEEOH>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
ARCS;
Keywords:
arc erosion; vacuum arc; vacuum interrupters; W-Cu;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
--discip_EC--
Citazioni:
9
Recensione:
Indirizzi per estratti:
Indirizzo: Slade, PG Cutler Hammer Inc, Horseheads, NY 14845 USA Cutler Hammer Inc Horseheads NY USA 14845 seheads, NY 14845 USA
Citazione:
P.G. Slade et al., "The unusual electrical erosion of high tungsten content, tungsten copper contacts switching load current in vacuum", IEEE T COMP, 24(3), 2001, pp. 320-330

Abstract

The electrical erosion of high tungsten content, tungsten-copper (7-10 wt.% Cu) was investigated. The contacts were placed in a vacuum interrupter envelope with a background pressure of about 10(-6) torr. The contacts switched one half cycle of 60 Hz current per operation. The polarity of the current was changed on each operation. Six contact pairs were investigated. Each pair was subjected to an ever-increasing number of operations: 1K, 5K, 10K, 20K, 40K, 50K, and 60K. The contact erosion was inferred by measuring the linear position of the moving contact terminal. On completing the electrical testing, the vacuum interrupters were dismantled and the contact surfaces were observed. Unlike the previous work on Ag-WC (50 wt. % Ag) and Cu-Cr(75 wt. % Cu), the W-Cu contacts showed a localized build up of erosion products on the contact surfaces even beginning at 1K operations. The experiments were repeated switching a unidirectional current i.e., the contacts remained at the same polarity throughout the experiments. Here an anode pip and a cathode crater were formed immediately. The difference in the topographies of these contacts is discussed in terms of the metallographic analysisof the deposits on the contacts, the erosion deposits on the shields surrounding the contacts and the expansion of the vacuum arc.

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Documento generato il 11/07/20 alle ore 10:11:55