【正文】 ody,Anti corrosion measures,grounding body using copper, copper clad steel earth body or hot galvanized materials。 C DC grounding, grounding resistance should be according to the puter system specific requirements determined。 steel and flat steel connections, its length is6 times the diameter of round steel。 galvanized grounding bar, flat steel in the underground buried depth should not be less .7 Importance of grounding and lightning grounding resistance testingLightning protection and grounding technology,In order to solve the munication network (including the user terminal ) overvoltage protection for the purpose, has developed a variety of lightning protection and grounding technology, these are to ensure the reliability of telemunication network technology, is the important basic technology in the field of munication. Now monly used by telemunications building integrated earthing( grounding ) and introduces a variety of lightning protection device. But, now has access to the optical fiber munication era, even in the munication network of the user terminal, at the same time, and connected to an AC power line, at the user terminal using the large scale integrated circuit is more and more, the new features of the lightning protection and grounding, raised new requirement, we must try to adapt to these new resistance test technology.In recent years, because of digital technology and the development of optical munication technology, so that the original installation in a telephone exchange part of the exchange, transmission equipment to the user mobile, and often these devices are mounted to the general residential buildings and overhead, so ask them with the telephone exchange room floor shielding effect, it is obviously not possible, then how to do? Now hand requires these devices improve the adaptability, on the other hand, in order to prevent the leakage of electricity and lightning voltage on human body and equipment hazards, grounding and lightning protection is the grounding purposes, especially for outdoor equipment grounding, leakage current and lightning protection is particularly important. The grounding resistance requirements, technical standards are clearly defined, it is. In order to ensure that the grounding resistance value to meet the requirement, after construction of the grounding resistance testing work is very necessary. But with the progress of the modernization of city, now the city roads and sidewalks are all concrete pavement asphalt pavement or covered now, if still use auxiliary electrode method to test the ground resistance, it is difficult to too much. The new ground resistance test method are 1, the existing ground resistance test grounding resistance is equal to the grounding electrode potential and the injected current ratio. The current earth resistance test method, as shown in figure 1. Where E is the grounding electrode, C is injected into the current of the auxiliary electrode, P is to test the potential of the auxiliary electrode imaginary reference point. Test, signal device in the E ~ C electrode with500 ~ 2KHz AC current by the dotted line into a flow, a current meter and a voltage meter readings, we can find the grounding resistance value.In order to test the value of accurate, the distance between the electrodes shall be not less than 10meters. The distance, in the downtown area of the city, is often difficult to do.防雷接地摘要 防雷減災的意義在于用很少的錢預防大的損失，其作用在于使用科學的手段規(guī)避自然災害。接地電阻越小，散流就越快，被雷擊物體高電位保持時間就越短，危險性就越小。電位1 介紹近年來，很多國內外的標準不主張信息設備采用獨立的接地裝置，推薦采用共用接地系統(tǒng)。 接地就是讓已經(jīng)納入防雷系統(tǒng)的閃電能量泄放入大地，良好的接地才能有效地降低引下線上的電壓,避免發(fā)生反擊。在IEC標準和ITU相關標準中都不提倡單獨接地，美國標準IEEEStd11001992更尖銳地指出:不建議采用任何一種所謂分開的、獨立的、計算機的、電子的或其它這類不正確的大地接地體作為設備接地導體的一個連接點。 串聯(lián)式單點接地：也就是第1種接地方式。這種接地方式的好處在于：當接地系統(tǒng)中的其中一臺設備接地線出現(xiàn)斷路時，不會造成其它設備外殼出現(xiàn)電壓，對保障人身安全有好處。接地方法和第2種接地的區(qū)別在于：設備具有單獨的接地體（或者變通一下：直接接到離接地體最近的接地裝置上（或者接地源處），每個設備在電氣接地回路上的距離是比較遠的（例如超過50米））。 對于受干擾影響不大的直流和交流設備，可以接在一起——即使直流和交流電路因為某種原因連通了，因為他們不是同一個回路（接地可不是回路中的一部分），也不會造成設備損壞。3防雷接地裝置部分概念(1)雷電接受裝置：直接或間接接受雷電的金屬桿（接閃器），如避雷針、避雷帶（網(wǎng)）、架空地線及避雷器等。分為垂直接地體和水平接地體。同時接地電阻也是恒量接地裝置水平的標志。亦可測量低電阻導體的電阻值和土壤電阻率。四、使用前檢查測試儀是否完整，測試儀包括如下器件。因此，要正確使用接地線，規(guī)范掛、拆接地線的行為，自覺培養(yǎng)嚴謹?shù)陌踩ぷ髯黠L，提高自身的安全素質，才能拒危險隱患于千里之外，才能避免由于接地線原因引起的電氣事故。 (3)在工作地點兩段兩端懸掛接地線，以免用戶倒送電、感應電的可能，深受其害的例子不少。(6)新工作人員必須經(jīng)過對接地線使用的培訓、學習，考核合格后，方能單獨從事接地線操作或使用工作。帶接地線合開關會損壞電氣設備和破壞電網(wǎng)的穩(wěn)定，會導致嚴重的惡性電氣事故。防側擊雷施工方法：(1)直敷設的金屬管道及金屬物的頂端與防雷裝置連接.(2)進入建筑物的埋地金屬管道、屋面所有金屬管道及其構架亦與防雷裝置連接.(3)在施工中注意接地體（線）的搭接長度必須符合下列規(guī)定：扁鋼為其寬度的2倍（且至少3個棱邊焊接）；，焊縫長度不小于直徑的6倍，焊縫外觀良好；圓鋼與扁鋼連接時，其長度為圓鋼直徑的6倍；扁鋼與鋼管、扁鋼與角鋼焊接時，為了連接可靠，除應在其接觸部位兩側進行焊接外，并應焊以由鋼帶彎成的弧形（或直角形）卡子或直接由鋼帶本身彎面弧形（或直角形）與鋼管（或角鋼）焊接.外露的避雷帶采用熱鍍鋅的專門夾式支持碼支持，避免支持件與避雷帶焊接.用鋼管作防雷接地裝置（含針、帶等）時，襯長度不小于其外徑的4倍.－.接地電阻應進行檢測，177。接地及等電位連接：(1)所有電氣設備金屬外殼、構架、線管，電纜橋架必須有良好的接地，使其成為良好接地通路.(2)用作室外接地連接的圓鋼焊接長度不少于6倍圓鋼直徑，二面施焊；扁鋼之間連接為扁鋼寬度2倍，三面施焊；圓鋼與扁鋼連接為圓鋼6倍，二面施焊.(3)等電位鍍鋅圓鋼必須焊接在基礎地梁主接地鋼筋上，并與小區(qū)接地干線相連，在連接等電位箱內鍍鋅板時,，各接地銅線規(guī)格不少于4mm2，并確保接觸可靠.(4)接地連接的所有焊口必須油防銹漆二遍（混凝土結構內焊口除外）；鍍鋅接地圓鋼、.7防雷接地的重要性及接地電阻測試雷電防護及接地技術，以解決通信網(wǎng)絡（含用戶終端）的過電壓保護為目的，現(xiàn)已開發(fā)出了各種各樣的雷電防護及接地技術，這些都是確保通信網(wǎng)絡可靠性的重要技術，也是通信領域中重要的基礎技術。從接地的目的來看，特別是對室外設備接地，防漏電和防雷電就顯得特別重要。下面將對新舊地線電阻測試方法進行一下介紹，現(xiàn)行的地線電阻測試法，地線的接地電阻等于接地電極的電位與注入的電流的比值。為了測試值的準確，要求各電極間的距離不得小于10米。 14