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引用第3楼zihui于2007-07-19 15:14发表的 : d& B1 X( b3 `1 f" }( z* b
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4:SOLID INSULATION,DISTANCES THROUGH INSULATION怎么理解?
9 p' E& g) g5 j/ X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.' L) B. W1 T& {4 e
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. . ?, H! D1 }$ ]3 q/ b5 C& R3 Z4 I
以下引用于EN 60950-1-2006 Clause 2.10.5
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SOLID INSULATION shall be:
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% q v% y# h S- y− 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.3 y$ z( d7 S/ }; o4 b7 _/ f
& X' |. r- r* ?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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0 H# r1 {8 d( h# K2.10.5.2 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):" p. F1 _* V$ z" E
9 B; y, T% @# a/ g, g0 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:. d2 K, p, a) q1 x, K: j
• for FUNCTIONAL INSULATION and BASIC INSULATION there is no minimum distance through insulation;
# r2 T2 @( M/ P0 {9 B# W' j• SUPPLEMENTARY INSULATION or REINFORCED INSULATION shall have a distance through insulation that is 0,4 mm or greater, provided by a single layer.! O4 t& o3 `* ~; p8 e i3 `# P
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For compliance criteria, see 2.10.5.1.
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7 j% b& `! \4 m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。
; D8 p. l4 x* s" P, A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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