電湧保護器(SPD)工作原理及結構?開關型:無瞬時過電壓時顯示高阻抗,但響應雷瞬時過電壓時阻抗急劇變化為低值,允許雷電流通過。 作為這種裝置使用時的器件有放電間隙、氣體放電管、晶閘管等。
2020/06/01
duonianlaidefangleijiancefaxiandianliudibanghedianyadibangdedazhuangweizhizhiguanzhongyao,duijiedidianzuzhiyingxiangjiaoda。ruodianyadibangdezhuangdazailidiwangyuejindedifang,zedianzuzhiyuexiao,fanzhiyueda。duicifangleijiancerenyuanzai...
2020/05/11
使用普通的接地電阻測答試儀注意先測量下測試線的過渡電阻,測試後把測試線的過渡電阻減除。100米的2.5平房毫米的多股銅芯線一般在1.0歐姆左右。用接地電阻測試儀測試的方法是...
2020/05/11
由you於yu高gao壓ya雷lei電dian脈mai衝chong是shi雷lei害hai中zhong年nian損sun害hai設she備bei多duo的de,所suo以yi對dui高gao壓ya雷lei電dian引yin人ren的de設she備bei必bi須xu予yu以yi足zu夠gou重zhong視shi,在zai工gong程cheng上shang往wang往wang要yao根gen據ju設she備bei的de重zhong要yao性xing和he其qi對dui高gao電dian壓ya的de耐nai受shou能neng力li采cai用yong一yi級ji或huo多duo級ji設she防fang。其qi中zhong一yi級ji設she防fang,往wang往wang是shi把ba高gao電dian壓ya雷lei電dian脈mai衝chong的de幅fu值zhi降jiang低di...
2020/05/11
我國古代對電的認識,是從雷電及摩擦起電現象開始的.早在3000多年以前的殷商時期,甲骨文中就有了“雷”、“電”的形聲字.西周初期,在青銅器上就已經出現加雨字偏旁的“電”字.《淮南子墜形訓》認為“陰陽相博為雷,激揚為電”...
2020/05/09
伴(ban)隨(sui)春(chun)季(ji)的(de)到(dao)來(lai)雷(lei)雨(yu)天(tian)氣(qi)增(zeng)多(duo),為(wei)讓(rang)每(mei)一(yi)個(ge)學(xue)生(sheng)都(dou)能(neng)夠(gou)更(geng)好(hao)的(de)了(le)解(jie)和(he)掌(zhang)握(wo)防(fang)雷(lei)的(de)科(ke)普(pu)知(zhi)識(shi),積(ji)極(ji)的(de)防(fang)範(fan)雷(lei)電(dian)災(zai)害(hai),避(bi)免(mian)悲(bei)劇(ju)發(fa)生(sheng),加(jia)強(qiang)個(ge)人(ren)安(an)全(quan)意(yi)識(shi),同(tong)學(xue)們(men)要(yao)掌(zhang)握(wo)以(yi)下(xia)的(de)防(fang)雷(lei)知(zhi)識(shi).在學校遇雷電天氣,應該注意:在有避雷裝置的教室裏是安全...
2020/05/09
建築物內部防雷措施主要是針對各種電子、電dian氣qi設she備bei防fang感gan應ying雷lei而er采cai用yong的de避bi雷lei裝zhuang置zhi,由you於yu其qi使shi用yong的de材cai質zhi主zhu要yao是shi氧yang化hua鋅xin壓ya敏min電dian阻zu元yuan件jian及ji其qi它ta電dian子zi元yuan器qi件jian,這zhe些xie避bi雷lei器qi件jian在zai遭zao受shou一yi次ci或huo多duo次ci反fan複fu感gan應ying雷lei擊ji後hou,其qi性xing能neng明ming顯xian降jiang低di或huo劣lie化hua衰shuai減jian...
2020/05/09
近jin年nian來lai,雷lei電dian災zai害hai漸jian已yi成cheng為wei較jiao嚴yan重zhong的de自zi然ran災zai害hai之zhi一yi,所suo以yi,防fang雷lei裝zhuang置zhi性xing能neng好hao壞huai,直zhi接jie關guan係xi著zhe防fang雷lei安an全quan。提ti及ji防fang雷lei裝zhuang置zhi,人ren們men自zi然ran想xiang到dao的de就jiu是shi避bi雷lei針zhen。其qi實shi,現xian代dai從cong防fang雷lei技ji術shu角jiao度du來lai說shuo防fang雷lei設she施shi包bao括kuo外wai部bu防fang雷lei保bao護hu(建築物或設施的直擊雷防護)...
2020/05/09
zaidaleishunjian,daliangdianheshunjianyongrukongqizhong,shiwuxianwangluodekongjiandiancichangfashengbianhua。yinci,juliedeleidianhuodongduigonggongfugaidewuxianwangluoxinhaoyouyidingyingxiang,danduifugaifanweijiaoxiaodejiayongwuxianwangluoxinhaozeyingxiangbuda。xiatianbaoyufeichangduo,leidianshiyouyudaqiyundongerchan...
2020/05/09