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引用第3楼zihui于2007-07-19 15:14发表的 :$ Q6 ~% B& d* ^% C- i5 M/ {. l
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4:SOLID INSULATION,DISTANCES THROUGH INSULATION怎么理解?
& D `4 R) |! W标准里说附加绝缘和加强绝缘的最小绝缘穿透距离是0.4mm.* S% W2 X, A+ m
是这样理解吗?比如,两导电体之间有一层隔膜,这个隔膜是起附加绝缘和加强绝缘作用的,那么这层隔膜的厚度最小要为0.4mm.
" s$ Z- ^( q7 ~5 \$ u8 F以下引用于EN 60950-1-2006 Clause 2.10.5
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SOLID INSULATION shall be:( T. |; T* t+ q
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− so dimensioned that overvoltages, including transients, that enter the equipment, and peak voltages that may be generated within the equipment, do not break down the SOLID INSULATION; and
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8 H! k8 t6 `; S$ T. o− so arranged that the likelihood of breakdown occurring due to the presence of pinholes in thin layers of insulation is limited.# I+ v5 J) h V: N- Q% k
: R8 g1 w# x% \# X固体绝缘的例子很多:PVC片、塑胶外壳、PCB板材料 等等。4 _0 Z+ z, g% N
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4 Q* t/ W' ^8 o% L( n2.10.5.2 Distances through insulation0 Z. x6 G: n% `! C$ S1 e1 p
+ |6 x4 E! |* u- Q- XIf a design is based on distances through insulation, these distances shall be dimensioned according to the application of the insulation (see 2.9) and as follows (see Figure F.14):- s6 k; _$ i( E1 [( R2 C
6 H U1 [; W% ~+ p) ]$ i− if the PEAK WORKING VOLTAGE does not exceed 71 V, there is no requirement for distance through insulation;
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− if the PEAK WORKING VOLTAGE exceeds 71 V, the following rules apply:
% R7 f, C* @. R5 T" A• for FUNCTIONAL INSULATION and BASIC INSULATION there is no minimum distance through insulation;( h1 h. }/ D" C" G; h
• SUPPLEMENTARY INSULATION or REINFORCED INSULATION shall have a distance through insulation that is 0,4 mm or greater, provided by a single layer.8 f9 n% h' m' C* A& x
" w4 o9 U$ n" FFor compliance criteria, see 2.10.5.1.. u$ A6 a! c( F4 e) |
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附加绝缘和加强绝缘的最小绝缘穿透距离是0.4mm,你说得没错。$ F7 _* e5 A9 D
如果,两导电体之间有一层隔膜,这个隔膜是起附加绝缘和加强绝缘作用的,那么这层隔膜的厚度最小要为0.4mm。这个也对。。。 |
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