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引用第3楼zihui于2007-07-19 15:14发表的 :
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. F, g N% f r4 d3 D) F4:SOLID INSULATION,DISTANCES THROUGH INSULATION怎么理解?
7 H2 Q9 [* V3 G( r$ S" p4 a( i0 e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 G1 `# c7 h8 y7 S( |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. 2 T, e6 L% h/ |( }4 z
以下引用于EN 60950-1-2006 Clause 2.10.5
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/ s7 ?/ s T, N5 F$ o6 GSOLID INSULATION shall be:
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% g- z- M, Y6 l# Y' @* a− 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.* h; I2 m* q3 z2 i6 P
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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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2.10.5.2 Distances through insulation
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2 S+ t) G; z* L3 R4 b% A; wIf 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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" ^& W4 M8 n$ t4 X3 y0 y' W o− 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:( l% d, M1 N, @5 t2 \- [( o
• for FUNCTIONAL INSULATION and BASIC INSULATION there is no minimum distance through insulation;
2 H( e. d+ ?. a• 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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5 b$ _/ c, N0 P. K6 vFor compliance criteria, see 2.10.5.1.
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* b& w: x3 a1 o$ E6 l9 G: p$ \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。
/ |, l7 w' A2 f6 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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