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引用第12楼artscan于2009-03-11 16:42发表的 :7 l( }! o' ?" Z4 F4 C9 V5 D
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......; q S! Z% y7 S6 D2 ^. x4 U: a
灌封没有意义的...
57.9.4Construction f).9 P: R, X- J2 _, z; }2 t
CREEPAGE DISTANCES within moulded transformers are considered not to exist if it can
' J% b# e# C3 N0 _. gbe shown that no gas bubbles are present and the thickness of the insulation between
1 f- H7 f$ N H# c- A0 nenamelled or lacquered primary and secondary windings is at least 1 mm for reference
" F) B0 w, E8 S3 F( @& ?! ?" uvoltages U not exceeding 250 V and increased proportionally for higher reference8 f7 Z4 _1 Z+ S/ c# ?3 a# n0 {
voltages.; L) n3 M, Z) e
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. . V+ Z6 C: c7 F' {7 ^7 }
; X% H' A9 J# l+ L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, % y' F1 ~" k; c) B: x& ?" ^# [
if Reference Vr.m.s of pri. & sec. < Vin+Vout, Cr.=8: D9 s& H# i2 g; ]' Y% \4 @
else, if Reference Vr.m.s of pri. & sec. > Vin+Vout, Cr.= 8 + x(linear calculated out from Table 16.)
7 w0 l$ y: t1 _* M( l( n) p! g# P6 A6 _- ?. z4 j# k
Humble opinion only... |
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发表于 2009-3-2 11:43
