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引用第12楼artscan于2009-03-11 16:42发表的 :
( T4 m+ x- O1 ~+ \/ K8 K% P一般是按照实际工作电压来算啊,不过确实这个地方是有不同意见的......4 B" T8 a+ N) a4 a
灌封没有意义的...
57.9.4Construction f).3 \$ i) r. t# [$ {- _' s
CREEPAGE DISTANCES within moulded transformers are considered not to exist if it can( {$ w5 `5 a/ j6 U; |
be shown that no gas bubbles are present and the thickness of the insulation between2 u1 s5 y( ~! x2 X9 C {" x
enamelled or lacquered primary and secondary windings is at least 1 mm for reference( T1 n: j* L$ C! ^' V# Z
voltages U not exceeding 250 V and increased proportionally for higher reference
) p7 r+ ` v, S% `; bvoltages.
* F- q: Q5 r( s/ c- S如何能保证无气泡灌注是一门工艺, 似乎拍X光片检查比自己动手剧开要省力的多.
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对于初次级之间的爬电距离, 变压器内部无可厚非一般是按有效值来计算, # y8 N5 K! p% A+ |7 T
if Reference Vr.m.s of pri. & sec. < Vin+Vout, Cr.=8
/ b7 t3 h O' xelse, if Reference Vr.m.s of pri. & sec. > Vin+Vout, Cr.= 8 + x(linear calculated out from Table 16.) + e4 e- e; C) u. b, |4 l
~) K4 ^: u9 p2 {8 J+ d* M7 v
Humble opinion only... |
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发表于 2009-3-2 11:43
