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引用第12楼artscan于2009-03-11 16:42发表的 :
6 H \4 F' Y* I- {/ z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......) K2 V, F$ p1 j8 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: 0 H/ V0 _4 Y# r9 @
57.9.4Construction f)." n( [) B. G" v% S# S% K
CREEPAGE DISTANCES within moulded transformers are considered not to exist if it can
: V- @) ?- @: |be shown that no gas bubbles are present and the thickness of the insulation between6 z$ @. l0 x' \8 r' f- Z% c" c
enamelled or lacquered primary and secondary windings is at least 1 mm for reference) C& Q" [3 a6 u! }* t8 @4 @
voltages U not exceeding 250 V and increased proportionally for higher reference
0 a- J1 _' c7 ~$ }7 Z+ s$ f' ~voltages.1 j2 O5 _4 B" x/ G! S) `+ f
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. + P) ~6 @8 K$ _4 s6 c/ J6 H3 m% H
+ l, E7 Q. l$ _6 _6 T1 c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 m" T* _' C3 }! ~if Reference Vr.m.s of pri. & sec. < Vin+Vout, Cr.=8" L1 n0 }, E% l' W7 }1 k* E
else, if Reference Vr.m.s of pri. & sec. > Vin+Vout, Cr.= 8 + x(linear calculated out from Table 16.)
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5 G/ d; l) J; u5 X1 bHumble opinion only... |
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