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引用第21楼nw-interfans于2009-12-28 21:18发表的 :- Y% U* O# O# v( [6 x
而IEC60884和VDE0620关于耐压实验是：
. U7 j/ ]% I& I l- s9 f. U7 y1：试验所用高压变压器应设计成：当将输出电压调到相应的试验电压后使输出接线端短路时，输出电流至少为200mA。
; ]/ r! a0 [( M' L; Q8 i8 ]注2：在输出电流小于100mA时，过电流继电器不得工作。
@0 r- M* Z0 O7 I( R2 `5 y, M" N' p5 W60065标准中也有这么讲：* ~5 n$ w9 }/ ^8 V2 v9 U
( U' ~. Y0 o$ G The test voltages shall be obtained from a suitable source so designed that, when the output9 M# y4 h. F: ]. d: ]0 j8 D' V
TERMINALS are short-circuited after the test voltage has been adjusted to the appropriate level,
$ v& d' B7 b4 h" F- Q' N9 vthe output current is at least 200 mA.! n. X" q4 V2 e9 A# f
An over-current device shall not trip when the output current is less than 100 mA.; u' G8 V; X( V+ O" A. k
Care shall be taken that the value of the test voltage applied is measured within ±3 %.
7 s$ [; H# Z, {" k Initially, not more than half of the prescribed test voltage is applied, then it is raised rapidly to
9 x. s! l0 y1 P; ~the full value which is held for 1 min. |
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