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引用第12楼artscan于2009-03-11 16:42发表的 :8 O A0 ^; E! k
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 {5 V5 F5 \ K! ]; [ q0 T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: / V( g1 `: k( r# b- G
57.9.4Construction f).5 c4 e" c8 t% D1 [' i
CREEPAGE DISTANCES within moulded transformers are considered not to exist if it can! J' @: c: ^% C' Y) x
be shown that no gas bubbles are present and the thickness of the insulation between! Y9 @ T% P x7 u
enamelled or lacquered primary and secondary windings is at least 1 mm for reference; e/ T2 F* D; k, g% H4 Z
voltages U not exceeding 250 V and increased proportionally for higher reference
) f- s% A; o) U- _2 p- a- Uvoltages.% ?% _$ s* r( J+ g
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. 0 u1 x0 @- l* c2 V5 @# E( g6 G
& M; z. Q! z( F# d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,
0 D( F& q" ^8 i6 I# @6 lif Reference Vr.m.s of pri. & sec. < Vin+Vout, Cr.=8) ` \; i+ ^1 r/ I9 m6 S* K% G
else, if Reference Vr.m.s of pri. & sec. > Vin+Vout, Cr.= 8 + x(linear calculated out from Table 16.)
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, a8 q. i+ p2 J8 hHumble opinion only... |
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