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引用第12楼artscan于2009-03-11 16:42发表的 :
: J# U7 j; X7 ]* N" w% {( [6 v5 H/ @# g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......7 j v1 L9 [) s/ n
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: 2 Q- s; ^; F7 L9 E/ I
57.9.4Construction f).
2 _3 c, P u; U+ VCREEPAGE DISTANCES within moulded transformers are considered not to exist if it can" r ], `( P3 w. c
be shown that no gas bubbles are present and the thickness of the insulation between j5 Q) c1 N, l4 v" F
enamelled or lacquered primary and secondary windings is at least 1 mm for reference( @/ i! Z: z+ I8 x, R* y/ n
voltages U not exceeding 250 V and increased proportionally for higher reference" M2 v1 {: g. \2 s1 a0 U
voltages./ m9 i$ h+ {" g/ 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. * g. M+ b5 X5 T9 E' [7 E }
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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, 2 j' a z5 K# `: L0 A; d9 }
if Reference Vr.m.s of pri. & sec. < Vin+Vout, Cr.=88 @' l2 s7 b8 J
else, if Reference Vr.m.s of pri. & sec. > Vin+Vout, Cr.= 8 + x(linear calculated out from Table 16.)
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9 I7 S4 R: H$ e2 o' U: X- e$ ]2 a$ K) a gHumble opinion only... |
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