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引用第12楼artscan于2009-03-11 16:42发表的 :! P$ k, U( v2 M6 n7 @9 \
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 b. B7 V/ u8 n" A1 O. j2 Y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: 7 ^5 `8 e* E" M+ O3 t$ \
57.9.4Construction f).
c/ n6 V% K0 g+ ] O4 j* aCREEPAGE DISTANCES within moulded transformers are considered not to exist if it can
6 X/ p5 H1 [! h( hbe shown that no gas bubbles are present and the thickness of the insulation between: \9 ]( A( _' {/ X
enamelled or lacquered primary and secondary windings is at least 1 mm for reference6 z, S6 o# b/ P. a+ O0 q
voltages U not exceeding 250 V and increased proportionally for higher reference
) r( x; Y7 y& [$ s Xvoltages.
1 l" F. l% u% h# B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. ! n8 {1 O# t& X
; N; {, t. r% H1 |! O& Z% q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, + A1 J0 q1 Q3 f9 @& S5 |! u. u
if Reference Vr.m.s of pri. & sec. < Vin+Vout, Cr.=8
$ I5 b8 E/ Z% \4 Telse, if Reference Vr.m.s of pri. & sec. > Vin+Vout, Cr.= 8 + x(linear calculated out from Table 16.)
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+ m: C7 n# P) ?! |( y5 B1 ^' LHumble opinion only... |
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