TN-C-S系统中的TN,C,S分别的英文单词是什么?

WXJLDH

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!
& L6 i0 g" l1 D  c3 R% A, _! D
[ 本帖最后由 bdblbyq 于 2007-7-11 12:34 编辑 ]

feifei45

Terra Neutral-Combined-Separate

( `5 k& h  Q1 |. g

* o/ F9 h7 \; Q" M3 s) [4 [: XInternational standard IEC 60364 distinguishes three families of earthing arrangements, using the two-letter codes TN, TT, and IT.

4 i! j1 e' I% W: w2 f+ eThe first letter indicates the connection between earth and the power-supply equipment (generator or transformer):

9 x- b4 C9 Z1 f; Z0 @T  :  direct connection of a point with earth (French: terre);
* F! O2 E; E9 B; i  }! [5 s- q! jI  :  no point is connected with earth (isolation), except perhaps via a high impedance.
8 F' K# e7 o) y; u  J
The second letter indicates the connection between earth and the electrical device being supplied:
8 C0 s" ^) f3 P( z8 @; }- ]
T  :  direct connection with earth, independent of any other earth connection in the supply system;
N  :  connection to earth via the supply network
( b; r, m0 }) |
. f- ~7 w+ W  c! c6 }
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:

+ q! ]8 Z0 J* i$ x' M$ RTN‑S  :  PE and N are separate conductors that are connected together only near the power source.
3 ^. o5 f( T3 VTN‑C  :  A combined PEN conductor fulfils the functions of both a PE and an N conductor.
. I& p0 @$ g4 k$ v* ETN‑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?