|
引用第3楼zihui于2007-07-19 15:14发表的 :
, g/ J( w. V. M8 f8 E6 \接着8 i T; K3 J7 f- r
4:SOLID INSULATION,DISTANCES THROUGH INSULATION怎么理解?" n" F6 a& I \2 B' _$ W
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.% j' d+ Q1 L: n
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% O* b9 H- d4 _
以下引用于EN 60950-1-2006 Clause 2.10.57 x2 y- h6 ? F5 ]) `
: Z. a( p1 O4 n. jSOLID INSULATION shall be:
6 `3 F7 j& Q& G' s* N! a* ]* {* G/ @3 X% Z
− 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
2 `, J! C: G) s, o' D) j1 Y- j; J9 w3 D5 U9 \" q
− so arranged that the likelihood of breakdown occurring due to the presence of pinholes in thin layers of insulation is limited.
# t4 J: P9 U3 O, ?
+ ^# c9 w/ f4 t固体绝缘的例子很多:PVC片、塑胶外壳、PCB板材料 等等。- i% d+ I( n2 g- F0 L/ F( I
8 a; ^% O4 M0 @$ w# k6 D# [
% i7 w4 f% @5 f: A+ e9 Z4 x; p _, o- W G/ l8 \4 z) `; @; ]) m% E8 U
2.10.5.2 Distances through insulation4 c/ @$ ?- A. u/ d2 w8 \7 ~ D
0 ?) F+ I+ J- L+ a4 ~% t) l
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): N9 b k" N9 b4 t, S
1 {" e) G$ l! ^7 G− if the PEAK WORKING VOLTAGE does not exceed 71 V, there is no requirement for distance through insulation;
# C( {( ~( m! o% X5 S) E/ u. A# R0 \: Q F
− if the PEAK WORKING VOLTAGE exceeds 71 V, the following rules apply:
0 I4 [2 @+ l7 Q/ Y& I• for FUNCTIONAL INSULATION and BASIC INSULATION there is no minimum distance through insulation;% Y3 |) B# P) x1 M
• SUPPLEMENTARY INSULATION or REINFORCED INSULATION shall have a distance through insulation that is 0,4 mm or greater, provided by a single layer. r. M. p% t3 T/ M
! {8 R5 J3 a) H; \
For compliance criteria, see 2.10.5.1.
/ K, x; e1 R( z- D, i" r5 n2 f& ]. u4 [
( G7 J. z$ T- y9 `
2 R3 g" U/ H. q. J4 |/ [" R
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。$ Z* F- D8 k* O/ |6 T6 F
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。。。 |
|