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引用第3楼zihui于2007-07-19 15:14发表的 :. d/ X! K5 O6 H
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4:SOLID INSULATION,DISTANCES THROUGH INSULATION怎么理解?
( w Z8 o9 Y3 U) |- {. j# d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.; T: p6 Z( {2 l
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.
" p; w# f; e& U6 E4 R以下引用于EN 60950-1-2006 Clause 2.10.5
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( p Z+ A, V- ]1 \8 A0 g4 z* iSOLID INSULATION shall be:
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8 F2 g& k# u" I0 e: D+ J− 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& D: ^, }1 D! g3 @9 I
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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。
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2.10.5.2 Distances through insulation" [) m/ E, D6 Z6 S& s% m9 `$ d
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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):
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− if the PEAK WORKING VOLTAGE does not exceed 71 V, there is no requirement for distance through insulation;4 L" c. I, |$ |- i& y/ `7 @
. a- g) q0 }4 m" r( R. U− if the PEAK WORKING VOLTAGE exceeds 71 V, the following rules apply:) w6 z3 j8 Y2 A3 g5 y. J
• for FUNCTIONAL INSULATION and BASIC INSULATION there is no minimum distance through insulation;
/ Y2 w; O& M; s+ S& X/ L7 J: _• SUPPLEMENTARY INSULATION or REINFORCED INSULATION shall have a distance through insulation that is 0,4 mm or greater, provided by a single layer.8 g" N: q% b% `# s0 [" p
. h% f3 F+ y' L. \, N5 c7 IFor 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。
9 K. P$ T \4 Q9 M% x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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