标题: 对EN60745-1，28.1章节中爬电距离值可以减少的疑问 [打印本页] 作者: lele11 时间: 2009-8-6 14:52 标题: 对EN60745-1，28.1章节中爬电距离值可以减少的疑问 有没有人知道如下条款中说提到的电压梯度的峰值如何检测？有没有实例说明怎么将这个条款应用到线路板上呢？谢谢！: R- n8 w& H8 ?
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28.1$ ]- v! N, m5 y* v& _6 I, S
For conductive patterns on printed circuit boards, except at their edges, the values in the( U7 u+ \1 P4 ?. |6 V
table between parts of different potential may be reduced, as long as the peak value of the ' U3 _3 s A- W5 i$ U4 L! y8 {# k- uvoltage stress does not exceed:# s8 M& J D$ I3 H" M0 q
– 150 V per mm with a minimum distance of 0,2 mm, if protected against the deposition of dirt;* q6 E$ E# w+ J! t
– 100 V per mm with a minimum distance of 0,5 mm, if not protected against the deposition of) p: z6 g" ]9 c! x6 l+ D
dirt.* w: O* J7 k& Z5 t/ e3 b% M
When the limits mentioned above lead to higher values than those of the table, the values of : l; e0 N+ }$ l; h, {& W, athe table apply. - y6 A# A7 Q5 a" b! ~) d$ @For peak voltages exceeding 50 V, the reduced creepage distances only apply if the Proof ! f$ ^3 S D7 Y4 S" NTracking Index (PTI) of the printed circuit board, measured as in Annex G, is greater than : X& \0 f" y0 `1 k175. @" I7 e* s6 J/ bThese distances may be reduced further, provided that the tool complies with the & y& `" P& T7 y! H' p# Orequirements of Clause 18 when the distances are short-circuited in turn. [) D: L- W A6 D* j+ b: C; J& s8 B/ g% l0 ~, Y
对印刷电路板上的导电图形，其边棱除外，只要电压梯度的峰值没有超过下述值，表中关于不同极性部件间的值可以减小. # G5 G% J7 A* V9 o; x0 ~5 ^! G' q ——若是防尘物沉积的，为150V/mm，但最小距离为0.2mm. ' `$ h! |6 s* @; G1 r: ` ——若不是防尘物沉积的，为100V/mm，但最小距离为0.5mm.4 W8 N% F! j5 W1 U
对峰值电压超过150V的情况，只有印刷电路板的耐漏电起痕指数(PTI)按照附录G进行测量时超过175，减小的爬电距离规定才适用.# t+ c; K5 F7 R" Z( S' {! ~& j+ j
只要当这些距离轮流短路时，器具符合19章的要求，这些距离可以进一步的减小.作者: vbyu1987 时间: 2009-8-6 21:33
英文看不懂的啊作者: lele11 时间: 2009-8-11 14:21
引用第1楼vbyu1987于2009-08-06 21:33发表的 : 2 K. j0 V5 V" n; w英文看不懂的啊