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引用第12楼artscan于2009-03-11 16:42发表的 :% O, R- |% {6 n; `2 ]' w
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......+ a6 O4 w9 U. V; `8 w" u: O1 L
灌封没有意义的...
- G) H/ F4 x$ N9 ~, \57.9.4Construction f).
$ T5 r8 @5 u3 T) V, n/ oCREEPAGE DISTANCES within moulded transformers are considered not to exist if it can
4 S, l$ q' D* T: gbe shown that no gas bubbles are present and the thickness of the insulation between
" z6 w" o2 X' t; l7 M$ Jenamelled or lacquered primary and secondary windings is at least 1 mm for reference
- _! Y; v& ` W9 Y" tvoltages U not exceeding 250 V and increased proportionally for higher reference8 l8 Q" d! s1 b4 I4 S
voltages./ X) V2 M5 t# q. C! l' z
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.
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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, 3 Z8 N4 e; O# _( m0 f
if Reference Vr.m.s of pri. & sec. < Vin+Vout, Cr.=82 I8 |8 w4 y* Y/ ^
else, if Reference Vr.m.s of pri. & sec. > Vin+Vout, Cr.= 8 + x(linear calculated out from Table 16.) , }, g: N$ Z! f
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Humble opinion only... |
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发表于 2009-3-2 11:43
