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引用第3楼zihui于2007-07-19 15:14发表的 :! e e5 ]! K9 H, o: {9 G# i
接着
3 X% T$ e$ x5 v4 c6 e4:SOLID INSULATION,DISTANCES THROUGH INSULATION怎么理解?
$ @! q# p8 ~$ 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.
9 `- Z9 c+ \6 e' l3 i6 T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. + R( A, A0 f4 d5 G# b# L& l
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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9 E, G4 ~* `- l B3 O7 O− 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, W3 h1 k$ j/ N+ R+ Y
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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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固体绝缘的例子很多:PVC片、塑胶外壳、PCB板材料 等等。" N( w5 F# A6 Q
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2.10.5.2 Distances through insulation5 q1 ?( Q( S+ G1 k& d4 q
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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):1 ^/ Y$ L" v: l
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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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9 P1 I$ i7 Z5 I− if the PEAK WORKING VOLTAGE exceeds 71 V, the following rules apply:, O4 r0 j& I$ r& G6 Z& I9 H! o G
• for FUNCTIONAL INSULATION and BASIC INSULATION there is no minimum distance through insulation;7 ~9 m* _' Y1 Z
• 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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For compliance criteria, see 2.10.5.1.
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M% V, L$ ~/ L; P3 Q# N, X. h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。
2 [9 @7 y; H, L/ w8 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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