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引用第12楼artscan于2009-03-11 16:42发表的 :* b0 t0 `/ ^: [( b. z' Y! V
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......3 m4 p# Q2 V) z) @. ^
灌封没有意义的...
2 a8 ]" G5 M! \8 p9 X' x57.9.4Construction f).
# ^; W9 }$ h- `CREEPAGE DISTANCES within moulded transformers are considered not to exist if it can4 m T+ R( |/ p6 ^
be shown that no gas bubbles are present and the thickness of the insulation between
9 s$ S0 D5 x8 i) u/ Fenamelled or lacquered primary and secondary windings is at least 1 mm for reference
; A& V) \8 x! J, {8 Wvoltages U not exceeding 250 V and increased proportionally for higher reference: t) V4 L1 A* u$ h. \* F
voltages.
# z# b1 T, a8 W7 }1 O" [6 n9 Y0 p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. - V1 H" R( P. Z9 W$ m6 k0 ?# C W/ I
0 w* ~6 M. b% ^3 n: w9 g
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,
6 s5 g4 G- `# H5 `3 s! c' _: [if Reference Vr.m.s of pri. & sec. < Vin+Vout, Cr.=8
" S2 Q/ n* z2 k% ~" ?else, if Reference Vr.m.s of pri. & sec. > Vin+Vout, Cr.= 8 + x(linear calculated out from Table 16.)
4 }# L9 b0 H% _' A/ {6 S! ?, r, {2 @& d$ q; d/ t
Humble opinion only... |
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发表于 2009-3-2 11:43