電子汽車衡防雷擊的8步走

電(dian)(dian)(dian)(dian)子汽車衡如何防雷擊(ji)呢？打雷閃(shan)電(dian)(dian)(dian)(dian)時會引起(qi)大氣(qi)電(dian)(dian)(dian)(dian)磁(ci)場的(de)(de)(de)(de)強(qiang)烈變化(hua)(hua)(hua)，主要表現有三(san)種物(wu)(wu)理(li)過(guo)程：一、靜電(dian)(dian)(dian)(dian)感(gan)應(ying)，即閃(shan)電(dian)(dian)(dian)(dian)引起(qi)的(de)(de)(de)(de)地面大氣(qi)靜電(dian)(dian)(dian)(dian)場變化(hua)(hua)(hua)，使(shi)接(jie)閃(shan)物(wu)(wu)體附近(jin)導(dao)(dao)體產生感(gan)應(ying)電(dian)(dian)(dian)(dian)荷，對地構成(cheng)*的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)位差；二、電(dian)(dian)(dian)(dian)磁(ci)感(gan)應(ying)，即閃(shan)電(dian)(dian)(dian)(dian)通(tong)道(dao)中(zhong)電(dian)(dian)(dian)(dian)流隨時間發生變化(hua)(hua)(hua)，在它(ta)周圍空間形(xing)成(cheng)變化(hua)(hua)(hua)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)磁(ci)場，在通(tong)道(dao)附件(jian)的(de)(de)(de)(de)導(dao)(dao)電(dian)(dian)(dian)(dian)物(wu)(wu)體上產生感(gan)應(ying)電(dian)(dian)(dian)(dian)壓和渦(wo)電(dian)(dian)(dian)(dian)流；三(san)、電(dian)(dian)(dian)(dian)磁(ci)輻射，是由(you)閃(shan)電(dian)(dian)(dian)(dian)通(tong)道(dao)中(zhong)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)流快速變化(hua)(hua)(hua)形(xing)成(cheng)的(de)(de)(de)(de)。由(you)于電(dian)(dian)(dian)(dian)子汽車衡只耐低壓，因此(ci)閃(shan)電(dian)(dian)(dian)(dian)引起(qi)的(de)(de)(de)(de)上述三(san)種物(wu)(wu)理(li)過(guo)程對其破壞性，尤(you)其是電(dian)(dian)(dian)(dian)磁(ci)感(gan)應(ying)。微電(dian)(dian)(dian)(dian)子設備(bei)越(yue)(yue)先進、耗電(dian)(dian)(dian)(dian)越(yue)(yue)小(xiao)、越(yue)(yue)靈(ling)敏(min)，則(ze)破壞性越(yue)(yue)大。因此(ci)，電(dian)(dian)(dian)(dian)子汽車衡防止雷擊(ji)要做(zuo)好以下工作：

    一、在秤(cheng)體附近上空(kong)要設(she)置避雷(lei)針，以放電效(xiao)應中(zhong)和(he)云團中(zhong)的(de)電荷，使電子汽車衡不致因雷(lei)擊而損壞。避雷(lei)針的(de)高(gao)度(du)可根據電子汽車衡長度(du)而定，避雷(lei)針保護半徑等(deng)于其高(gao)度(du)的(de)一個圓形區域。

    二、整個秤臺要接(jie)(jie)(jie)地(di)，用一根或數根接(jie)(jie)(jie)地(di)電(dian)(dian)纜將秤體與接(jie)(jie)(jie)地(di)樁相連，接(jie)(jie)(jie)地(di)樁要打在電(dian)(dian)位恒定(ding)的零區，且接(jie)(jie)(jie)地(di)電(dian)(dian)阻小于4。秤臺與接地樁之間有了寬敞(chang)的大電(dian)流回流通道，則當(dang)靜電(dian)感應時，可以從(cong)大地補充電(dian)子(zi)使其中和，在設備產生高(gao)電(dian)位后能快(kuai)速疏散而不致(zhi)損(sun)壞(huai)電(dian)子(zi)汽(qi)車衡。

    三、每個(ge)傳感(gan)器(qi)(qi)要有保護(hu)接(jie)地(di)(di)。因此每個(ge)傳感(gan)器(qi)(qi)位置(zhi)(zhi)要設置(zhi)(zhi)一(yi)個(ge)接(jie)地(di)(di)線，傳感(gan)器(qi)(qi)與(yu)(yu)“地(di)(di)”之間設置(zhi)(zhi)接(jie)地(di)(di)樁，接(jie)地(di)(di)線與(yu)(yu)接(jie)地(di)(di)樁進行可靠(kao)連接(jie)或將接(jie)地(di)(di)線與(yu)(yu)就近地(di)(di)腳(jiao)螺(luo)栓連接(jie)。但地(di)(di)腳(jiao)螺(luo)栓必須與(yu)(yu)基礎內(nei)鋼(gang)筋接(jie)地(di)(di)網相連。

    四(si)、穿信號電纜的金(jin)屬穿線(xian)管也必須與(yu)接地網相連(lian)。

    五、稱重(zhong)傳(chuan)感器(qi)(qi)(qi)信(xin)號電(dian)(dian)纜(lan)的(de)(de)屏蔽(bi)層要接(jie)地(di)。電(dian)(dian)子汽車衡由市電(dian)(dian)電(dian)(dian)網供電(dian)(dian)時，從配電(dian)(dian)室(shi)到安裝(zhuang)地(di)有根長(chang)一(yi)段(duan)空間距(ju)(ju)離，秤臺到秤房也有一(yi)段(duan)較長(chang)距(ju)(ju)離的(de)(de)信(xin)號電(dian)(dian)纜(lan)，不難(nan)設(she)想，雷(lei)擊通過電(dian)(dian)磁(ci)感應(ying)途徑，在引線上引人高電(dian)(dian)位，就有可(ke)能(neng)造成稱重(zhong)儀表(biao)的(de)(de)損(sun)壞(huai)(huai)，因此，稱重(zhong)傳(chuan)感器(qi)(qi)(qi)的(de)(de)信(xin)號線和激勵稱重(zhong)傳(chuan)感器(qi)(qi)(qi)的(de)(de)電(dian)(dian)流電(dian)(dian)源線采用將屏蔽(bi)層接(jie)地(di)的(de)(de)電(dian)(dian)纜(lan)連接(jie)，以消除電(dian)(dian)磁(ci)感應(ying)雷(lei)擊破壞(huai)(huai)或引起燃爆的(de)(de)可(ke)能(neng)。稱重(zhong)傳(chuan)感器(qi)(qi)(qi)信(xin)號電(dian)(dian)纜(lan)的(de)(de)屏蔽(bi)層可(ke)以與稱重(zhong)傳(chuan)感器(qi)(qi)(qi)的(de)(de)接(jie)地(di)線相連，也可(ke)以與稱重(zhong)顯(xian)示器(qi)(qi)(qi)的(de)(de)接(jie)地(di)樁相連；可(ke)依現場情(qing)況確(que)定，但不允許雙點分別同兩個(ge)接(jie)地(di)樁人地(di)。

    六、稱重顯(xian)示儀表(biao)外(wai)殼要接(jie)(jie)(jie)地(di)。因此(ci)。地(di)秤房(fang)內(nei)設(she)接(jie)(jie)(jie)地(di)樁(zhuang)，且與秤的基(ji)礎內(nei)鋼筋(jin)網（接(jie)(jie)(jie)地(di)）相連(lian)，當采用塑料外(wai)殼時，應在外(wai)殼內(nei)表(biao)面噴涂一層金屬(shu)膜再接(jie)(jie)(jie)地(di)。

    七、接線(xian)盒要(yao)接地。接線(xian)盒要(yao)設(she)置(zhi)接地線(xian)與(yu)秤體相連。

    八(ba)、電源要有(you)接(jie)地，同時要配防浪涌保(bao)護器。

    做(zuo)好以上(shang)幾點，電子(zi)秤的安(an)全可靠性就(jiu)大(da)大(da)加強了，特(te)別是(shi)那些多(duo)雷地區(qu)的用戶，在安(an)裝電子(zi)汽(qi)車衡時一(yi)定要(yao)注意以上(shang)要(yao)求(qiu)，以確保電子(zi)汽(qi)車衡安(an)全使用。

電子汽車衡防雷擊的8步走