|
引用第12楼artscan于2009-03-11 16:42发表的 :: M3 `) i9 x3 y3 ?7 }1 l% 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......5 B2 q8 |' {% r. o! L
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: # z& r0 S1 N# K3 t
57.9.4Construction f).
6 W3 l7 ^% `1 FCREEPAGE DISTANCES within moulded transformers are considered not to exist if it can
+ B, z$ O% _1 ~% Lbe shown that no gas bubbles are present and the thickness of the insulation between( Z: d+ _& @8 [* h1 D
enamelled or lacquered primary and secondary windings is at least 1 mm for reference
: Q6 ^& n% j0 V/ A V8 d vvoltages U not exceeding 250 V and increased proportionally for higher reference
% X2 k0 O" E: J# a9 J8 p2 Bvoltages.+ ^. M+ z- W5 r- y3 f5 X
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.
- U( f* w* ^* U3 _* Q5 k0 w4 @+ {9 V! Y6 N1 D7 t
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, d: I8 ?. [7 F: j" f! _
if Reference Vr.m.s of pri. & sec. < Vin+Vout, Cr.=8
- J+ J( c1 u& k/ telse, if Reference Vr.m.s of pri. & sec. > Vin+Vout, Cr.= 8 + x(linear calculated out from Table 16.) * v6 m7 p8 L. k+ N" b7 h
$ T- z3 t+ l& h8 v+ v' gHumble opinion only... |
|