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引用第12楼artscan于2009-03-11 16:42发表的 :8 \9 k* k: h0 y* d W8 m
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......# T' p5 [* \+ t- ]1 T
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: : ^( \. K7 F( a3 h" d; a
57.9.4Construction f)." m. I, X! L9 Y$ m
CREEPAGE DISTANCES within moulded transformers are considered not to exist if it can
/ O5 a& a6 _7 M: E. abe shown that no gas bubbles are present and the thickness of the insulation between1 e# H c* h; f7 l
enamelled or lacquered primary and secondary windings is at least 1 mm for reference9 ~# p7 {3 ?& n; J
voltages U not exceeding 250 V and increased proportionally for higher reference
9 b( b, O! A) S# A$ }voltages.
+ E- y- V+ Q1 B& U) G8 P2 H1 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. 8 _. @: ?# |, \* t
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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,
+ ^: y2 l+ x! M* a8 r4 |7 q4 \if Reference Vr.m.s of pri. & sec. < Vin+Vout, Cr.=8" J. J* ^! J+ T
else, if Reference Vr.m.s of pri. & sec. > Vin+Vout, Cr.= 8 + x(linear calculated out from Table 16.) 1 i7 k- w/ D$ Z: D! i
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Humble opinion only... |
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