《current_transformer_paper》.pdf

  1. 1、本文档共7页,可阅读全部内容。
  2. 2、有哪些信誉好的足球投注网站(book118)网站文档一经付费(服务费),不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。
  3. 3、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。如您付费,意味着您自己接受本站规则且自行承担风险,本站不退款、不进行额外附加服务;查看《如何避免下载的几个坑》。如果您已付费下载过本站文档,您可以点击 这里二次下载
  4. 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“版权申诉”(推荐),也可以打举报电话:400-050-0827(电话支持时间:9:00-18:30)。
查看更多
《current_transformer_paper》.pdf

Selecting Current Transformers Part 1 By Darrell G. Broussard, P.E. Introduction: • A secondary winding around the As engineers, we are aware that electrical power core systems have grown. How much have they • Insulating material grown? When was the last time you specified a When current travels through a current 2400-volt system, a 4160-volt 250 MVA system, caring device, such as a cable or bus duct it a 15 kV 500 MVA system or specified a 2000- develops a magnetic field at right angles to amp 480-volt system? An industrial plant now the flow of current. The strength of the requires a larger and more complex system than magnetic field varies as the current magitude was required just a few years ago. The 2400-volt changes during all operating conditions. As systems have all but disappeared; 4160-volt learned in transformer theory, when a systems have expanded from 350 MVA to 63 kA magnetic field strikes a wire, it will cause a (equivalent to 500 MVA). The 15 kV systems current to flow in the wire. By using the also have expanded to 63 kA (equivalent to 1500 strength of the magnetic field and knowing MVA). Has all of the electrical system the turns ratio, we can obtain a value of expanded? current that is useable for meters, relays and other current sensing device. In order to monitor and to protect the power system we must measure the energy flow. To In order to scale a value of high current connect a meter, relay or other current sensing flowing in a conductor, the engineer needs device in series with a lar

文档评论(0)

wfkm + 关注
实名认证
内容提供者

该用户很懒,什么也没介绍

1亿VIP精品文档

相关文档