{"title":"Blow-open forces on double-break contacts","authors":"John J. Shea, B. DeVault, Y. Chien","doi":"10.1109/HOLM.1993.489666","DOIUrl":null,"url":null,"abstract":"Measurements were made on a double-break contact geometries, commonly used in power distribution devices, to determine contact dynamics under various short circuit fault conditions. These measurements lead to a modification to improve contact dynamics during a short circuit. The modification consisted of a guide-rod which prevented contact arm rotation during arcing. Contact dynamics depended on two blow-open forces, magnetic repulsion and gas pressure. Both forces were quantified for various double-break contact geometries along with arc voltage and contact travel. The gas pressure, created by arc radiation, was found to be a significant blow-open force. Measured blow-open forces were compared to a sealed piston model to obtain an empirical equation for blow-open forces. Contact performance was also determined with and without the guide-rod for a range of arc currents.","PeriodicalId":11624,"journal":{"name":"Electrical Contacts - 2007 Proceedings of the 53rd IEEE Holm Conference on Electrical Contacts","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1993-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"25","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Electrical Contacts - 2007 Proceedings of the 53rd IEEE Holm Conference on Electrical Contacts","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/HOLM.1993.489666","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 25
Abstract
Measurements were made on a double-break contact geometries, commonly used in power distribution devices, to determine contact dynamics under various short circuit fault conditions. These measurements lead to a modification to improve contact dynamics during a short circuit. The modification consisted of a guide-rod which prevented contact arm rotation during arcing. Contact dynamics depended on two blow-open forces, magnetic repulsion and gas pressure. Both forces were quantified for various double-break contact geometries along with arc voltage and contact travel. The gas pressure, created by arc radiation, was found to be a significant blow-open force. Measured blow-open forces were compared to a sealed piston model to obtain an empirical equation for blow-open forces. Contact performance was also determined with and without the guide-rod for a range of arc currents.
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