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引用第3楼zihui于2007-07-19 15:14发表的 :/ l- \/ u2 l6 y9 O. H
接着
0 P& g, E. h7 y$ v' F. h3 ^+ n4:SOLID INSULATION,DISTANCES THROUGH INSULATION怎么理解?
, L! Z. q5 A! u4 y8 Q; M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.
1 e* _2 Q1 i H$ x5 i& d/ _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.
' }6 E! q& H* F) A6 {+ k8 ]& [以下引用于EN 60950-1-2006 Clause 2.10.5( t# `% ^& l: ]# [9 I/ _
. S& D% x0 O8 @SOLID INSULATION shall be:6 |; W% x8 m2 c% q
- `% F/ k- [- m' d− 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; and2 U9 n: c. q, I% s4 {* g) U
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− so arranged that the likelihood of breakdown occurring due to the presence of pinholes in thin layers of insulation is limited.
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8 K3 n+ X, Q, T9 Z8 r固体绝缘的例子很多:PVC片、塑胶外壳、PCB板材料 等等。 X; e8 p0 c- m1 t1 f
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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):
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− if the PEAK WORKING VOLTAGE does not exceed 71 V, there is no requirement for distance through insulation;) }: c2 \. j3 p3 T( M
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− if the PEAK WORKING VOLTAGE exceeds 71 V, the following rules apply:
, l3 S2 x6 A6 B. }" x• for FUNCTIONAL INSULATION and BASIC INSULATION there is no minimum distance through insulation;6 M0 X9 x0 G3 O! h1 x! f
• SUPPLEMENTARY INSULATION or REINFORCED INSULATION shall have a distance through insulation that is 0,4 mm or greater, provided by a single layer.4 r9 L) J; s, N% X! c5 O
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For compliance criteria, see 2.10.5.1.
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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。
& _! G3 S8 T. v0 a J1 [ f3 t" U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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