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引用第12楼artscan于2009-03-11 16:42发表的 :
* `- p1 }: S5 z$ \) w1 @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 H- ~ z$ b9 ]: [* a2 t/ h
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: ' L& D% Q6 M& |5 L8 x
57.9.4Construction f).: Q" u) E) n$ G( I& u. p k5 d( p
CREEPAGE DISTANCES within moulded transformers are considered not to exist if it can
7 G0 l0 L" q2 q4 C/ Kbe shown that no gas bubbles are present and the thickness of the insulation between
. g( G6 ?. \+ ^3 Q+ P: _enamelled or lacquered primary and secondary windings is at least 1 mm for reference
7 B; O* ], w3 K) l, J- v wvoltages U not exceeding 250 V and increased proportionally for higher reference
/ X5 F1 k/ e% _! Svoltages.
2 p8 V. v5 E0 i1 A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,
' `" V5 I6 K) J; Gif Reference Vr.m.s of pri. & sec. < Vin+Vout, Cr.=8- c0 v6 }& s3 j( d
else, if Reference Vr.m.s of pri. & sec. > Vin+Vout, Cr.= 8 + x(linear calculated out from Table 16.) * R$ I4 I. c. `
5 O! D! Y+ n: `" M4 E% F* Z4 \Humble opinion only... |
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