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引用第12楼artscan于2009-03-11 16:42发表的 :. z4 {) R9 d% U# s; Z G
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 F$ y$ R* I$ F8 J7 ^0 _灌封没有意义的... 灌封并不一定没有意义. 请看标准这段说明:
, @3 C4 b. t( R# i) V57.9.4Construction f).. n5 g) f6 c \1 v3 i1 C
CREEPAGE DISTANCES within moulded transformers are considered not to exist if it can5 d( i# m! {. A- F
be shown that no gas bubbles are present and the thickness of the insulation between0 G3 j6 Z/ d! Y7 e
enamelled or lacquered primary and secondary windings is at least 1 mm for reference6 Q8 a/ r# j' @% x- b- Q$ _7 g
voltages U not exceeding 250 V and increased proportionally for higher reference4 \0 {' Z' C1 P
voltages.8 m3 L, g; N+ j
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. & q3 Z; r4 ?% K( @% ^
6 U( {& r, C' U) ^3 u( W: s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,
7 ^4 U' R8 |. s; }% G, eif Reference Vr.m.s of pri. & sec. < Vin+Vout, Cr.=8
; J4 j( E$ i/ q5 selse, if Reference Vr.m.s of pri. & sec. > Vin+Vout, Cr.= 8 + x(linear calculated out from Table 16.) 2 V3 s. {* M7 h' B) F2 A5 {
" v$ C$ Q7 {, O$ r4 [Humble opinion only... |
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