|
|
引用第12楼artscan于2009-03-11 16:42发表的 :
* e ^6 g1 @7 l* ?. v+ O W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......$ v' y' a2 n. p/ r0 }$ h: B) c! U
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: ) g1 `1 f4 W3 C
57.9.4Construction f).; j7 C: E' Q5 g# O
CREEPAGE DISTANCES within moulded transformers are considered not to exist if it can
4 B3 l6 e$ V7 t% \; bbe shown that no gas bubbles are present and the thickness of the insulation between
, v: F8 E6 {5 H2 Senamelled or lacquered primary and secondary windings is at least 1 mm for reference }) I) d6 |4 C/ b! n# k5 G1 c
voltages U not exceeding 250 V and increased proportionally for higher reference6 q1 i; J4 u& P6 e6 g0 R" |
voltages.
& T" F% h; b+ L6 w7 w1 L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. % t3 p# _7 p b e( Z
/ X- M+ B4 E$ }1 t# a$ g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,
0 B3 }7 z, E6 q/ ?, T' ~9 v5 R( @8 B2 Pif Reference Vr.m.s of pri. & sec. < Vin+Vout, Cr.=8) C' }8 Y! _- F
else, if Reference Vr.m.s of pri. & sec. > Vin+Vout, Cr.= 8 + x(linear calculated out from Table 16.) 7 |, x( p/ f, Q" O1 i
, }, T. o1 i& ?
Humble opinion only... |
|