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引用第3楼zihui于2007-07-19 15:14发表的 :7 S7 B+ r0 s4 c* i* {6 S
接着
, _9 X6 O6 d+ @4:SOLID INSULATION,DISTANCES THROUGH INSULATION怎么理解?: A1 ?/ f( U# Y \% f
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.
$ N @6 H& n8 G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.
5 v/ x [% T% X3 a0 _) x# e以下引用于EN 60950-1-2006 Clause 2.10.5
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$ T5 }+ k1 }9 i% iSOLID INSULATION shall be:
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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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− so arranged that the likelihood of breakdown occurring due to the presence of pinholes in thin layers of insulation is limited.7 {5 ^' ^7 c& m \& l
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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。& }( G4 o# ^' P" t
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2.10.5.2 Distances through insulation
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m3 T! s) Y4 L, f Q+ `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):- ^% i4 X0 T, _
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− 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:
0 ~1 Q/ L6 e9 E2 Z• for FUNCTIONAL INSULATION and BASIC INSULATION there is no minimum distance through insulation;5 v. O ]) E; n5 A2 X5 a/ x
• SUPPLEMENTARY INSULATION or REINFORCED INSULATION shall have a distance through insulation that is 0,4 mm or greater, provided by a single layer." T' C4 `. B# ~% K% ]" k1 O7 F7 \+ _
1 M9 }& v l9 V, N: ~, Z% S8 fFor compliance criteria, see 2.10.5.1.: s* ?% Z/ ^/ @! V% ^& v5 A- T
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+ k. u" J' X: H8 t h( @/ _; Y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。* ]5 i$ L+ V4 \+ R
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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