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在TT裝置中，中性導(dǎo)線連接到電源星形中心，
它通常是分布式的，具有產(chǎn)生相電壓的功能（例如。
230 V），適用于單相負(fù)載供電。外露導(dǎo)電
相反，部分單獨(dú)或共同地局部連接到地球。
TT系統(tǒng)通常用于民用設(shè)施。
當(dāng)電源分配給負(fù)載時(shí)，通常使用TN系統(tǒng)
擁有自己的變電站。中性導(dǎo)線直接接地
在變電站內(nèi)；外露的導(dǎo)電部件連接到同一個(gè)
中性導(dǎo)線的接地點(diǎn)，并可局部接地。
根據(jù)輸電系統(tǒng)的布置，考慮了三種類型的輸電系統(tǒng)
中性和保護(hù)導(dǎo)體：
1.TN-C中性點(diǎn)和保護(hù)功能組合在一根導(dǎo)線中
（PEN導(dǎo)線）；
2.TN-S中性導(dǎo)線和保護(hù)導(dǎo)線始終分開(kāi)；
3.TN-C-S中性點(diǎn)和保護(hù)功能組合在一根導(dǎo)線中
在系統(tǒng)的一部分（PEN）和另一部分（PE+N）中分離。
我
In TT installations, the neutral conductor is connected to the supply star center, it is usually distributed and has the function of making the phase voltage (e.g. 230 V) available, useful for single-phase load supply. The exposed conductive parts, on the contrary, singularly or collectively, are locally connected to earth. TT systems are generally used for civil installations. TN systems are typically used when the power supply is distributed to loads having their own electrical substation. The neutral conductor is directly earthed in the substation; the exposed conductive parts are connected to the same earthing point of the neutral conductor, and can be locally earthed. Three types of TN system are considered according to the arrangement of neutral and protective conductors: 1. TN-C neutral and protective functions are combined in a single conductor (PEN conductor); 2. TN-S neutral and protective conductors are always separated; 3. TN-C-S neutral and protective functions are combined in a single conductor in a part of the system (PEN) and are separated in another part (PE + N). I
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