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引用第3楼zihui于2007-07-19 15:14发表的 :
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4:SOLID INSULATION,DISTANCES THROUGH INSULATION怎么理解?
: M% ^+ D9 T. c, F* _2 Z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.
2 _- R. o9 v/ i$ ~8 @) Y6 j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.
8 t6 S/ q; @8 ^8 [1 f; K以下引用于EN 60950-1-2006 Clause 2.10.5
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1 j3 D' x4 o( B" u& gSOLID INSULATION shall be:1 b+ `. Q, U$ M6 G" s2 E
- i, L- m; Q' F* l: j− 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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* F/ r6 h4 r& D" P( M+ `0 i− so arranged that the likelihood of breakdown occurring due to the presence of pinholes in thin layers of insulation is limited.- T: W' W6 I3 s$ w" Y) N1 Q! D
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固体绝缘的例子很多:PVC片、塑胶外壳、PCB板材料 等等。
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' Z3 o5 i6 o, {2.10.5.2 Distances through insulation
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If 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):5 Q( Y5 v' O; w5 d6 R
6 z; M/ T ]7 b1 S; x2 S% t− if the PEAK WORKING VOLTAGE does not exceed 71 V, there is no requirement for distance through insulation;
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- j' U0 X0 A7 Z− if the PEAK WORKING VOLTAGE exceeds 71 V, the following rules apply:
; B) n( ^* f+ i9 a( U• for FUNCTIONAL INSULATION and BASIC INSULATION there is no minimum distance through insulation;$ y% U. ?: u; e/ t% r
• SUPPLEMENTARY INSULATION or REINFORCED INSULATION shall have a distance through insulation that is 0,4 mm or greater, provided by a single layer.
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, ]& m. E l+ g+ @: E* fFor compliance criteria, see 2.10.5.1.8 W: ?( _ i/ ?7 t8 o2 h/ M% ]8 i
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/ T" F. X% K2 y5 ?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。8 @' T8 R6 C' A M2 o& |/ m
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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