标题: DSH 1048 [打印本页] 作者: chinatown 时间: 2017-1-7 11:19 标题: DSH 1048 Question ! k$ ~; e X) V3 fThe first sentence of clause 3.4.3.1 of IEC 60384-14 states: ”Capacitors of each technology, rated 9 r% y0 A. R& ?& qvoltage, class and sub-class shall be separately qualified”. 1 J# n" G) s2 Q) O# tIf it is requested to qualify a dual-class X/Y capacitor (e.g. X1:400 V, Y2:250V), is it permissible to- q5 ^3 h& {& }2 W) w# z4 [; r3 d
perform one type test only by applying for each individual test the highest test severity? 1 T" `/ i5 j& sTo qualify a dual-class X/Y capacitor, testing laboratories may have different interpretations of this 4 ?- Y- Q/ P5 p$ v& r: @# asentence. 9 X h n+ [1 @) D' [4 s/ V; FInterpretation a): Some testing laboratories test the same capacitor series once for X1 and once for' P* G5 k2 `' _& C. S
Y2 at the same time in separate type tests. / L3 n& o: D5 }* O" gInterpretation b): Other testing laboratories follow the opinion that the safety of the capacitors is also 3 b1 e8 o8 \8 C5 a7 _; uassured if a mixture of highest testing (peak) voltages of both sub-classes is used. This means worst ) M5 \; [' { o3 c6 v, rcase testing, covering both sub-classes for certification. ' c6 W$ A$ U- M- ABoth interpretations may possibly lead to the result of compliance or non-compliance of the capacitor, E7 Q6 t6 d1 }3 R# F* N8 Z9 a9 Bas in a) more samples are tested and in b) a single capacitor is more stressed.6 X* E5 } f( R- l* f* [! L2 I3 z7 `
From the technical point of view, it should be acceptable to perform one type test only by applying the ; V3 e* ]+ ~. @ j" G7 rhighest test severity for each test. 4 t2 j5 p2 F4 j- nDecision z7 K( M/ I4 o) ]! i4 T3 K
When a range of dual-class capacitors (X/Y) is qualified, it is allowed to perform one type test only, if 3 ^3 d$ K: ^% ]2 y- }! w. e jthe highest severity of the X or Y class is applied in each respective test./ J! c6 K: B" d
# y4 X9 S: h: w- l' B0 H 作者: chinatown 时间: 2017-1-7 11:20
DSH 1048附件