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              深圳市金維通訊技術有限公司
              電話交換機程控電話交換機威譜電話交換機國威電話交換機...網點分布:深圳 廣州 中山 佛山 珠海 惠州

              程控交換機防雷解決措施


              程控交換機防雷解決措施

                                                                  

               

               程控交換機最主要的部件是集成電路IC)IC抗干擾能力比較低,即使是從線路感應過來的雷電電磁脈沖(LEMP),也能把IC元件擊穿。所以程控交換機很容易發生雷擊事故。下面我將對這個問題進行深入的分析和探討。

                                                               

               

              雷電災害的分類和預防原則

               

                雷擊可以產生不同的破壞形式,國際電工委員會已將雷電災害稱為“電子時代的一大公害”,雷擊、感應雷擊、電源尖波等瞬間過電壓已成為破壞電子設備的罪魁禍首。從大量的通信設備雷擊事例中分析,專家們認為:由雷電感應和雷電波侵入造成的雷電電磁脈沖(LEMP)是通信設備損壞的主要原因。為此我們采取的防范原則是“整體防御、綜合治理、多重保護”。力爭將其產生的危害降低到最低點。

               

              防雷主要的應對措施

               

                接地是防雷體系中最基本的,也是最有效的措施。按照“接地”的作用不同,我們可以將“地”分成“工作地”、“保護地”和“防雷地”等形式。對重要的通信設備系統,一定具備的是“工作地”,它為整個系統提供標準參考電位,有了這個參考電位,系統才能正常工作;如果系統同時由強電電源供電,還需將設備外殼接“保護地”,以保護人身安全;如果系統還有室外架空金屬設備或電纜與之相連,還需要系統在合理位置接“防雷地”,以防止雷擊高壓串入系統中。

               

                如果通信系統的“工作地”、“保護地”和“防雷地”是分別安裝,互不連接,自成系統,我們稱作“分設接地系統”。如果三者合并設在一起,形成一個統一接地系統,我們稱為“合設接地系統”程控交換機的接地采用聯合接地方式,接地體的接地電阻<1Ω(實測0.7Ω)

               

                在實際布線過程中,采用類似“分散接地”的布線方式,即工作地線和保護地線都從地線排上引出,兩種地線不直接就近相連,其優點是當雷電流流過接地網時,雷電流只縱向流動,即使存在接觸不良的接點,也不會造成橫向干擾。交換機的接地處理:用一根135mm2的多股銅芯導線,單獨連接到接地線線排上。不同于系統的是:(1)不直接與交換機的正極就近相連,也不將機柜與帶正極的纜、線隨機連接。(2)機柜與高架地板及底座的接觸部分都進行了絕緣處理,相當于采用了“懸浮接地”方式,以防止相近面層的靜電及建筑物的雜散電流串入機柜,對通信造成干擾。

               

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