【正文】 the equipment of building, join with PE thread, but forbid connecting PE line with N line. Defend static earth resistance demand ≤ 100Ω the same.　Intelligent power supply earth system of building should adopt TNS system , should adopt according to norm one a total one mon to ground the device , namely unify the earth body. It is a earth electric potential datum point to unify the earth body , therefore draw various kinds of function earth lead wire separately, the way of the electric potential of utilize electric potential such as being total and auxiliarying etc. makes up an intact unified earth system. Generally, unify earth system usable pile reinforcing bar of building, and zincplated flatrolled steel link an organic whole it with 40* 4 (mm), as the natural earth body. According to norm, should systematic defending thunder earth share systematically , in conformity with ≤ 1Ωearth resistance its. If can not reach the requirement , must increase artificial earth body or adopt chemistry lower law of hindering , make ≤ 1Ω of earth resistance . In turn into distribution is it wait for electric potential copper arrange always to set up , copper this arrange one end through construct post or reinforcing bar of baseplate connect with unified earth body, another end join with exchanges neutral line , earth of system separately through different connection end son, with is it make safe protection earth every equipment join , with defend thunder39。單點(diǎn)接地　　TN－C系統(tǒng)被稱之為三相四線系統(tǒng)，該系統(tǒng)中性線N與保護(hù)接地PE合二為一，通稱PEN線。TN－S系統(tǒng)的特點(diǎn)是：中性線N與保護(hù)接地線PE在進(jìn)戶時(shí)共同接地后，不能再有任何電氣連接。該接地系統(tǒng)完全具備安全和可靠的基準(zhǔn)電位。只有單相接地故障時(shí)，由于保護(hù)接地靈敏度低，故障不能及時(shí)切斷，設(shè)備外殼才可能帶電。因此它是不適用于擁有大量單相設(shè)備的智能化大樓的。：為把雷電流迅速導(dǎo)入大地，以防止雷害為目的的接地叫作防雷接地。這樣不僅可以有效防止雷擊損壞樓內(nèi)設(shè)備，而且還能防止外來的電磁干擾?！　≡诟邏合到y(tǒng)里，采用中性點(diǎn)接地方式可使接地繼電保護(hù)準(zhǔn)確動(dòng)作并消除單相電弧接地過電壓。 　　如果裝有接地裝置的電氣設(shè)備的絕緣損壞使外殼帶電時(shí)，接地短路電流將同時(shí)沿著接地體和人體兩條通路流過，I=IL＋I(xiàn)P，我們知道：在一個(gè)并聯(lián)電路中，通過每條支路的電流值與電阻的大小成反比。：在一幢智能化樓宇內(nèi)，包含有大量的計(jì)算機(jī)，通訊設(shè)備和帶有電腦的大樓自動(dòng)化設(shè)備。這些現(xiàn)象會(huì)對設(shè)計(jì)用來發(fā)送或接收很高傳輸頻率的設(shè)備產(chǎn)生很大的干擾。防靜電接地要求在潔靜干燥環(huán)境中，所有設(shè)備外殼及室內(nèi)（包括地坪）設(shè)施必須均與PE線多點(diǎn)可靠連接。在智能大廈中，因?yàn)橄到y(tǒng)采用計(jì)算機(jī)參與管理或使用計(jì)算機(jī)作為工作工具，所以其接地系統(tǒng)宜采用單點(diǎn)接地并宜采取等電位措施。可從機(jī)柜引出三個(gè)相互絕緣的接地端子，再由引線引到總等電位銅排上共同接地。智能化樓宇的供電接地系統(tǒng)宜采用TN－S系統(tǒng)，按規(guī)范宜采用一個(gè)總的共同接地裝置，即統(tǒng)一接地體。屏蔽及其正確接地是防止電磁干擾的最佳保護(hù)方法。因此為了使其準(zhǔn)確性高，穩(wěn)定性好，除了需有一個(gè)穩(wěn)定的供電電源外，還必須具備一個(gè)穩(wěn)定的基準(zhǔn)電位。　IP—流經(jīng)人體的電流由上式可以看出，接地電阻越小，流經(jīng)人體的電流越小，通常人體電阻要比接地電阻大數(shù)百倍經(jīng)過人體的電流也比流過接地體的電流小數(shù)百倍。：安全保護(hù)接地就是將電氣設(shè)備不帶電的金屬部分與接地體之間作良好的金屬連接。防雷裝置如與電氣設(shè)備的工作接地合用一個(gè)總的接地網(wǎng)時(shí)，接地電阻應(yīng)符合其最小值要求。從已建成的大樓看，大樓的各層頂板，底板，側(cè)墻，吊頂內(nèi)幾乎被各種布線布滿。如果采用TN－C系統(tǒng)，將TN－C系統(tǒng)中的N線同時(shí)用做接地線；或者在TN－S系統(tǒng)中將N線與PE線接在一起，再連接到底板上去；再或不設(shè)置電子設(shè)備的直流接地引線，而將直流接地直接接到PE線上；有的干脆把N線、PE線、直流接地線混接在一起。隨著大容量的漏電保護(hù)器的出現(xiàn)，該系統(tǒng)也會(huì)越來越作為智能型建筑物的接地系統(tǒng)。如果計(jì)算機(jī)等電子設(shè)備沒有特殊的要求時(shí)，一般都采用這種接地系統(tǒng)。PE線連接的設(shè)備外殼及金屬構(gòu)件在系統(tǒng)正常運(yùn)行時(shí),－,各自都從接地體一點(diǎn)引出,及選擇正確的接地電阻值使電子設(shè)備共同獲得一個(gè)等電位基準(zhǔn)點(diǎn)等措施,那么TN－C－S系統(tǒng)可以作為智能型建筑物的一種接地系統(tǒng)。智能化大樓內(nèi)，單相負(fù)荷所占比重較大，難以實(shí)現(xiàn)三相負(fù)荷平衡，PEN線的不平衡電流加上線路中存在著的由于熒光燈、晶閘管（可控硅）等設(shè)備引起的高次諧波電流，在非故障情況下，會(huì)在中性線N上疊加，使中性線N電壓波動(dòng)，且電流時(shí)大時(shí)小極不穩(wěn)定，造成中性點(diǎn)接地電位不穩(wěn)定漂移。統(tǒng)一接地體在建筑物供配電設(shè)計(jì)中，接地系統(tǒng)設(shè)計(jì)占有重要的地位，因?yàn)樗P(guān)系到供電系統(tǒng)的可靠性，安全性。 中文翻譯： 智能樓宇的電氣保護(hù)與接地摘　要: In a bit more neutrally power system not grounded directly , the earth electric current flows into the earth through the human body, and form thorough fare by electric capacity by circuit to ground, two situation these can lead to the fact the rights of the person get an electric shock.　If the insulation which is equipped with the electric equipment of the earth device is damaged while electrifying outer cover , short out in the electric current and flow through two thorough fares of earth body and human body at the same time in earth, I =IL + IP, we know: In a parallel circuit, the electric current value of passing each branch road is in inverse proportion to size of the resistance.In the type: I Electric current total value in the earth return circuitIL Electric current flowing through along the earth body IP Flow through electric current of the human body　Have type can find out earth resistance little , flow through to little electric current have human body, human resistance usually is it ground than earth resistance through electric current of human body electric current of body have several hundred less flowing through too to have several hundred heavier. When earth resistance is extremely small, the electric current that remakable body flows nearly equals zero. Namely I≈IL. In fact, because earth resistance very little, earth short out electric current flow out of date produce press and lower very lightly, so equipment outer cover voltage in earth high. People stand while going to touch the outer cover of the equipment on the earth, the voltage that the human body bears is very low, it can not be dangerous.　Is it protect earth device and reduce earth resistance of it to install additional , not only ensure the electric security of system of intelligent building, the effective measure operated effectively, it is not the essential means of equipment and personal security in the intelligent building that ensure too. current is grounded: In a block of intelligent building , include a large number of puters , munication apparatus and automation equipment of building with puter. Importing to information in these electronic equipment, transmission information, change energy , amplify signal, logic movement, output information a series of course go on through little electric potential or little electric current fast,