|
引用第12楼artscan于2009-03-11 16:42发表的 :/ f; v) F" J4 E% ~
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......& C- C& {9 @& Y! _& [ C/ E/ L7 @
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 r' S' H4 p- A9 C+ d
57.9.4Construction f).
. M' T$ B! \- `0 M; PCREEPAGE DISTANCES within moulded transformers are considered not to exist if it can
& l F: V/ ?& u& f1 f0 gbe shown that no gas bubbles are present and the thickness of the insulation between
4 _" P/ h3 t4 u' d( s" {6 `" }6 benamelled or lacquered primary and secondary windings is at least 1 mm for reference- W6 f6 k- N1 l+ O$ L# N. ]7 J
voltages U not exceeding 250 V and increased proportionally for higher reference9 p+ e: l; @2 s' U* p- v
voltages.
" r E1 k6 d+ 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.
2 ^9 ]. I0 |& K' Z5 [# S1 }0 X. W7 s6 f4 O% {
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,
; L( Z J. O8 cif Reference Vr.m.s of pri. & sec. < Vin+Vout, Cr.=8
* W8 a0 K) Q- [3 k. H7 I4 g' L+ kelse, if Reference Vr.m.s of pri. & sec. > Vin+Vout, Cr.= 8 + x(linear calculated out from Table 16.) # C9 V5 G/ }3 L, g J
6 @6 G f# _* U" _2 J0 [2 f
Humble opinion only... |
|