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引用第3楼zihui于2007-07-19 15:14发表的 :$ d. J$ N- D: b5 v# ~5 R$ w8 J
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4:SOLID INSULATION,DISTANCES THROUGH INSULATION怎么理解?, y' Y* W p2 c, ^' k* O
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.3 \# h0 ]" D$ R7 [
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.
]9 [" v6 W5 t3 D4 \: D7 A* }以下引用于EN 60950-1-2006 Clause 2.10.5
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. V4 \; B* Q% n/ {& N+ P− 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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: z1 n3 Q, W R% |− so arranged that the likelihood of breakdown occurring due to the presence of pinholes in thin layers of insulation is limited.* o4 s* k9 S) {2 ~( G' a
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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。6 x! T% L. Y3 e* b: a5 o+ k! n, z! x
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7 H. ~6 }: ?8 O3 z. c2 ?2.10.5.2 Distances through insulation! o3 p: B& R; W8 `4 H* A2 }* A
# y7 |, l; ]( _7 A' v3 M6 }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):2 f% a$ D/ c0 q4 l$ f
, |* l* A2 e- a" |− 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:
6 e/ V* p8 D4 A1 G2 ~1 z• for FUNCTIONAL INSULATION and BASIC INSULATION there is no minimum distance through insulation;7 ~/ s: T d8 P' w( V
• 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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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。 O) Q+ g! G9 x0 ^
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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