- 1、本文档共17页,可阅读全部内容。
- 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、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、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
10kv配电线路防雷外文文献
西安科技大学
毕业设计(论文)
英文翻译
题 目 柠条塔煤矿10kV配电线路防雷研究
院、系(部) 电气与控制工程学院
专业及班级 电气工程及其自动化0802班
姓 名 关斌斌(0806060209)
指 导 教 师 李 忠
日 期 2012年6月10日_
英文资料(一)
Fundamentals of Lightning Protection
Introduction
Lightning is a capricious, random and unpredictable event. Its physical characteristics include current levels sometimes in excess of 400 kA, temperatures to 50,000 degrees F., and speeds approaching one third the speed of light. Globally, some 2000 on-going thunderstorms cause about 100 lightning strikes to earth each second. USA insurance company information shows one homeowners damage claim for every 57 lightning strikes. Data about commercial, government, and industrial lightning-caused losses is not available. Annually in the USA lightning causes more than 26,000 fires with damage to property (NLSI estimates) in excess of $5-6 billion.
The phenomenology of lightning strikes to earth, as presently understood, follows an approximate behavior:
1. The downward Leaders from a thundercloud pulse towards earth seeking out active electrical ground targets.
2. Ground-based objects (fences, trees, blades of grass, corners of buildings, people, lightning rods, etc., etc.) emit varying degrees of electric activity during this event. Upward Streamers are launched from some of these objects. A few tens of meters off the ground, a collection zone is established according to the intensified local electrical field.
3. Some Leader(s) likely will connect with some Streamer(s). Then, the switch is closed and the current flows. We see lightning.
Lightning effects can be direct and/or indirect. Direct effects are from resistive (ohmic) heating, arcing and burning. Indirect effects are more probable. They include capacitive, inductive and magnetic behavior. Lightning prevention or protection (in an absolute sense) is impossible. A diminution of its consequences, together wit
您可能关注的文档
- 07-13山东数学理科高考试题.doc
- 07-09成都中考物理真题集.doc
- 07--V7000 DS4700虚拟化_ 李新.doc
- 07127施工缝QC.doc
- 072第五章物流成本控制.ppt
- 06机械设备管理控制程序.doc
- 07-光电材料.ppt
- 07_明度对比.ppt
- 07版东风日产专营店商务规定.doc
- 07第七章__购买性支出.doc
- 广东省乐昌市事业单位考试(中小学教师类D类)职业能力倾向测验重点难点精练试题1套.docx
- 辽宁省北票市职业能力倾向测验事业单位考试(中小学教师类D类)试题必考题.docx
- 浙江省诸暨市事业单位考试职业能力倾向测验(中小学教师类D类)强化训练题库及答案一套.docx
- 2025年深圳市中兴通讯股份有限公司校园招聘模拟试题附带答案详解带答案.docx
- 2025年海澜集团公司校园招聘模拟试题附带答案详解汇编.docx
- 2025年深圳天诚家具有限公司校园招聘85人公开引进高层次人才和急需紧缺人才笔试参考题库答案详解版完.docx
- 2024年人教版七7年级下册数学期末质量监测试卷含答案.pdf
- 2024年版社工《社会工作实务(初级)》考试典型题汇编(含答案)完整版724502314.pdf
- 2025年深圳市中兴通讯股份有限公司校园招聘模拟试题附带答案详解必威体育精装版.docx
- 2025年海澜集团公司校园招聘85人公开引进高层次人才和急需紧缺人才笔试参考题库答案详解版参考答案.docx
文档评论(0)