項目名稱：防雷裝置檢測
       項目地點：蔡家污水處理項目廠區
       項目內容：
       由于高(gao)壓(ya)雷(lei)電(dian)(dian)(dian)脈(mo)沖(chong)是(shi)雷(lei)害中年損害設(she)備(bei)多(duo)的(de)，所以(yi)對(dui)高(gao)壓(ya)雷(lei)電(dian)(dian)(dian)引(yin)人的(de)設(she)備(bei)必須予以(yi)足(zu)夠重(zhong)(zhong)視，在工程上(shang)往往要根(gen)據設(she)備(bei)的(de)重(zhong)(zhong)要性和其(qi)對(dui)高(gao)電(dian)(dian)(dian)壓(ya)的(de)耐受能(neng)力采用(yong)一(yi)級(ji)或多(duo)級(ji)設(she)防。其(qi)中一(yi)級(ji)設(she)防，往往是(shi)把(ba)高(gao)電(dian)(dian)(dian)壓(ya)雷(lei)電(dian)(dian)(dian)脈(mo)沖(chong)的(de)幅值(zhi)降(jiang)低(di)，如果電(dian)(dian)(dian)源(yuan)輸入(ru)是(shi)明線(xian)(xian)(xian)輸入(ru)，應(ying)把(ba)入(ru)室前三根(gen)電(dian)(dian)(dian)桿(gan)的(de)線(xian)(xian)(xian)碼(ma)鐵腳用(yong)金屬(shu)線(xian)(xian)(xian)引(yin)下接(jie)地(di)(di)，以(yi)便降(jiang)低(di)閃擊電(dian)(dian)(dian)壓(ya)。并且(qie)進房屋前后一(yi)根(gen)電(dian)(dian)(dian)桿(gan)的(de)零線(xian)(xian)(xian)(或接(jie)地(di)(di)系統的(de)地(di)(di)線(xian)(xian)(xian))重(zhong)(zhong)復接(jie)地(di)(di)，接(jie)地(di)(di)電(dian)(dian)(dian)限不(bu)應(ying)大于10歐姆(mu)(見圖1)。并在相線(xian)(xian)(xian)與(yu)地(di)(di)之間留有(you)2 mm的(de)空氣間隙，把(ba)從相線(xian)(xian)(xian)引(yin)來的(de)過電(dian)(dian)(dian)壓(ya)降(jiang)下來，可(ke)能(neng)的(de)悄況下，進戶(hu)線(xian)(xian)(xian)應(ying)盡量采用(yong)有(you)金屬(shu)屏(ping)蔽層的(de)電(dian)(dian)(dian)纜直(zhi)接(jie)埋(mai)地(di)(di)或穿金屬(shu)管(guan)進線(xian)(xian)(xian)。
       在雷電(dian)高發區，房尾前為開闊地(di)，或房子(zi)內有精密電(dian)子(zi)設備(bei)和(he)電(dian)子(zi)計(ji)算機的(de)(de)情(qing)況(kuang)更應該是這樣.并且埋(mai)地(di)的(de)(de)電(dian)纜(lan)其絕對長(chang)度不應小于15m。并要求從(cong)架空線(xian)轉電(dian)纜(lan)的(de)(de)進(jin)線(xian)端，和(he)電(dian)纜(lan)入屋(wu)的(de)(de)輸出端，都接(jie)(jie)避(bi)雷器。避(bi)雷器的(de)(de)接(jie)(jie)地(di)端、電(dian)纜(lan)的(de)(de)金屬(shu)屏蔽層、鋼管都必須接(jie)(jie)到防雷電(dian)感應的(de)(de)接(jie)(jie)地(di)裝置(zhi)上。按供電(dian)部門要求.供電(dian)零線(xian)進(jin)人鋼筋水泥大(da)樓(lou)后，仍必須與從(cong)大(da)樓(lou)、梁、柱內引出的(de)(de)一條主鋼筋作(zuo)電(dian)氣連接(jie)(jie)，無鋼筋連接(jie)(jie)的(de)(de)建(jian)筑(zhu)物應做接(jie)(jie)地(di)極，把零線(xian)重(zhong)復(fu)接(jie)(jie)地(di)。

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