|
引用第3楼zihui于2007-07-19 15:14发表的 :! R4 w9 w' o6 E
接着0 R N; d' O- C8 R
4:SOLID INSULATION,DISTANCES THROUGH INSULATION怎么理解?) P( u: Y4 ^: N# i0 @7 ?, A
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.
( F- @ H' }/ D @- a- ~+ v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. 0 G" A- N0 k' b5 t7 z
以下引用于EN 60950-1-2006 Clause 2.10.51 @; L1 m: a, N
7 G8 M( r3 K4 MSOLID INSULATION shall be:/ u' n3 A" x0 c; M+ v* e1 Q
6 S1 t4 l! a, V
− 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
5 j A* z3 `5 m+ K, j1 r$ P0 Q6 f" g4 v2 H: U
− so arranged that the likelihood of breakdown occurring due to the presence of pinholes in thin layers of insulation is limited.7 |8 k# I: V: F- g4 Q+ h/ A1 d
8 @1 ]( C8 R( C, }3 P* o5 {+ V
固体绝缘的例子很多:PVC片、塑胶外壳、PCB板材料 等等。, i- w0 g8 W F* A
/ ?" Z/ Q2 H* c& p; N
# P- C9 y3 j7 y, W" B% O ?# ~. Y6 b# z1 M7 n% R7 N5 s
2.10.5.2 Distances through insulation
- {5 b$ e7 t; V8 h! Z" i+ d" X K4 f7 S; ~) k
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):
& u% f) l- g" _: o2 W$ b3 N5 u3 d- g& L+ k% e0 Y% n2 D
− if the PEAK WORKING VOLTAGE does not exceed 71 V, there is no requirement for distance through insulation;9 @) u7 m% i5 h0 D
+ O* [0 V9 C8 \6 Q6 t# \− if the PEAK WORKING VOLTAGE exceeds 71 V, the following rules apply:
7 _) u4 g \8 r/ e, I• for FUNCTIONAL INSULATION and BASIC INSULATION there is no minimum distance through insulation;! a# l' q$ F# U6 g9 y
• SUPPLEMENTARY INSULATION or REINFORCED INSULATION shall have a distance through insulation that is 0,4 mm or greater, provided by a single layer.
2 O" |0 E" s4 `' w
5 V) r3 Z$ J2 nFor compliance criteria, see 2.10.5.1.
9 A( o1 d. F, `2 l* M4 l* p
1 m4 N. ~. F5 H: r \
) s( g( r! Y/ J- e# y4 l8 J+ g$ s: {
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。
# [# }7 p# b8 b* v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。。。 |
|