标题: DSH 1048 [打印本页] 作者: chinatown 时间: 2017-1-7 11:19 标题: DSH 1048 Question. r4 W3 d# I# G& z/ d8 Q A
The first sentence of clause 3.4.3.1 of IEC 60384-14 states: ”Capacitors of each technology, rated( P% x+ y1 u0 {4 @' ~4 `
voltage, class and sub-class shall be separately qualified”.! l+ [1 G' c- f. c2 _- [
If it is requested to qualify a dual-class X/Y capacitor (e.g. X1:400 V, Y2:250V), is it permissible to , s* Z" u9 |+ Y# @& f7 Xperform one type test only by applying for each individual test the highest test severity?% ^6 }6 l* z" g- u6 W: C$ Q( y
To qualify a dual-class X/Y capacitor, testing laboratories may have different interpretations of this; J* ?1 J# f3 Q& ?
sentence. % _' F: H+ a( ]4 E6 u+ wInterpretation a): Some testing laboratories test the same capacitor series once for X1 and once for8 E$ t* \9 A" r p+ K
Y2 at the same time in separate type tests. 8 W' V$ P/ N8 U! KInterpretation b): Other testing laboratories follow the opinion that the safety of the capacitors is also u+ S/ s( u: w) M! y
assured if a mixture of highest testing (peak) voltages of both sub-classes is used. This means worst2 m9 Q @8 c3 m. a5 _; y/ Y5 x6 V
case testing, covering both sub-classes for certification.' Z; M% [6 [) l9 q4 ]
Both interpretations may possibly lead to the result of compliance or non-compliance of the capacitor, $ m5 Y+ Z: |% T0 S. @& |. `: zas in a) more samples are tested and in b) a single capacitor is more stressed./ i& \, D, I" x7 v5 K+ K: m. A
From the technical point of view, it should be acceptable to perform one type test only by applying the , Y R7 v$ U6 l A/ \; d) yhighest test severity for each test. j b7 G6 Q. l; {/ H
Decision ; b* b7 J- _6 B7 z- A, ^4 XWhen a range of dual-class capacitors (X/Y) is qualified, it is allowed to perform one type test only, if) q! g3 K" [) B* [
the highest severity of the X or Y class is applied in each respective test.: j6 R# T- ^9 }* v
% G' E- W+ y' _$ E' L9 ?0 g 作者: chinatown 时间: 2017-1-7 11:20
DSH 1048附件