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引用第12楼artscan于2009-03-11 16:42发表的 :& C3 \8 v* W7 `# Z8 i4 P
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...... H1 A2 n, j# }% _2 L7 v
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:
% K2 J. K- y0 v' e4 V' t4 }57.9.4Construction f).
; G- \ c* @( e6 T8 x4 pCREEPAGE DISTANCES within moulded transformers are considered not to exist if it can, `5 g: T. K% B+ S5 y6 n" c) p
be shown that no gas bubbles are present and the thickness of the insulation between; ^9 c; [! j) R3 b4 ]2 J
enamelled or lacquered primary and secondary windings is at least 1 mm for reference" o: n- k6 L9 I% p
voltages U not exceeding 250 V and increased proportionally for higher reference5 Z' }- m* d q7 i3 r% q( ^
voltages.
0 m6 I9 h3 }+ k# p$ s* d- {, h* [& ?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. 6 l. p& N- m6 a) o/ `& ?9 H
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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,
4 P: a4 U- W( Dif Reference Vr.m.s of pri. & sec. < Vin+Vout, Cr.=8
8 H; B) ^; j- @) oelse, if Reference Vr.m.s of pri. & sec. > Vin+Vout, Cr.= 8 + x(linear calculated out from Table 16.)
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7 o" G& C8 e* q, Z' E: pHumble opinion only... |
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