{"title":"配电系统的现代保护","authors":"J. Gers","doi":"10.1049/PBPO068E_ch9","DOIUrl":null,"url":null,"abstract":"Overcurrent relays are the most common form of protection used to operate only under fault conditions. They should not be installed purely as a means of protecting systems against overloads. The relay settings that are selected are often a compromise in order to cope with both overload and overcurrent conditions. Overcurrent relays can be classified as definite current, definite time, and inverse time as shown in Figure 9.1(a-c). The time delay units can work in conjunction with the instantaneous units as shown in Figure 9.1(d).","PeriodicalId":276847,"journal":{"name":"Distribution Systems Analysis and Automation","volume":"105 4 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2013-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Modern protection of distribution systems\",\"authors\":\"J. Gers\",\"doi\":\"10.1049/PBPO068E_ch9\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Overcurrent relays are the most common form of protection used to operate only under fault conditions. They should not be installed purely as a means of protecting systems against overloads. The relay settings that are selected are often a compromise in order to cope with both overload and overcurrent conditions. Overcurrent relays can be classified as definite current, definite time, and inverse time as shown in Figure 9.1(a-c). The time delay units can work in conjunction with the instantaneous units as shown in Figure 9.1(d).\",\"PeriodicalId\":276847,\"journal\":{\"name\":\"Distribution Systems Analysis and Automation\",\"volume\":\"105 4 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2013-11-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Distribution Systems Analysis and Automation\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1049/PBPO068E_ch9\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Distribution Systems Analysis and Automation","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1049/PBPO068E_ch9","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Overcurrent relays are the most common form of protection used to operate only under fault conditions. They should not be installed purely as a means of protecting systems against overloads. The relay settings that are selected are often a compromise in order to cope with both overload and overcurrent conditions. Overcurrent relays can be classified as definite current, definite time, and inverse time as shown in Figure 9.1(a-c). The time delay units can work in conjunction with the instantaneous units as shown in Figure 9.1(d).
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