TN-C-S系统中的TN,C,S分别的英文单词是什么?

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TN-C-S系统中的TN,C,S分别的英文单词是什么?不要中文,谢谢!
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[ 本帖最后由 bdblbyq 于 2007-7-11 12:34 编辑 ]

feifei45

Terra Neutral-Combined-Separate
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$ t% K+ ^! [' f4 nInternational standard IEC 60364 distinguishes three families of earthing arrangements, using the two-letter codes TN, TT, and IT.

% `3 l) o" n; y, @The first letter indicates the connection between earth and the power-supply equipment (generator or transformer):
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9 X  z% c: e* c9 G! y4 k8 f% HT  :  direct connection of a point with earth (French: terre);
I  :  no point is connected with earth (isolation), except perhaps via a high impedance.

The second letter indicates the connection between earth and the electrical device being supplied:
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+ h! p  M! K, i$ n( yT  :  direct connection with earth, independent of any other earth connection in the supply system;
* D( _- ^+ L4 i; YN  :  connection to earth via the supply network

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The conductor that connects the exposed metallic parts of the consumer is called protective earth (PE). The conductor that connects to the star point in a three-phase system, or that carries the return current in a single-phase system, is called neutral (N). Three variants of TN systems are distinguished:
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TN‑S  :  PE and N are separate conductors that are connected together only near the power source.
TN‑C  :  A combined PEN conductor fulfils the functions of both a PE and an N conductor.
6 u/ n# X0 i+ z1 W. RTN‑C‑S  :  Part of the system uses a combined PEN conductor, which is at some point split up into separate PE and N lines. The combined PEN conductor typically occurs between the substation and the entry point into the building, whereas within the building separate PE and N conductors are used. In the UK, this system is also known as protective multiple earthing (PME), because of the practice of connecting the combined neutral-and-earth conductor to real earth at many locations, to reduce the risk of broken neutrals - with a similar system in Australia being designated as multiple earthed neutral (MEN).

WXJLDH

很详细,谢谢!有关它的英文标准吗?