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Question
. V- v+ j+ u) w% J. b. FThe first sentence of clause 3.4.3.1 of IEC 60384-14 states: ”Capacitors of each technology, rated4 O- G0 a* J) S" {$ c0 Y
voltage, class and sub-class shall be separately qualified”.% e! X2 i7 }) W& }1 c
If it is requested to qualify a dual-class X/Y capacitor (e.g. X1:400 V, Y2:250V), is it permissible to
; G( Z0 J( w( j5 operform one type test only by applying for each individual test the highest test severity?2 N! `) z7 Z; x/ l- a4 B% V; B
To qualify a dual-class X/Y capacitor, testing laboratories may have different interpretations of this
( Z# ?* b1 s' Q3 j& ysentence.% P* R) o( N; d7 ]9 J) h7 \
Interpretation a): Some testing laboratories test the same capacitor series once for X1 and once for
$ f5 _- Y3 E8 b9 BY2 at the same time in separate type tests.9 ^& i/ {3 l3 r3 i9 e7 C
Interpretation b): Other testing laboratories follow the opinion that the safety of the capacitors is also
2 R( ?# }( f' m3 Eassured if a mixture of highest testing (peak) voltages of both sub-classes is used. This means worst
3 z3 y7 U( r0 x) ecase testing, covering both sub-classes for certification.$ T9 U8 Y; ~" {7 T) U6 N. p+ m
Both interpretations may possibly lead to the result of compliance or non-compliance of the capacitor,
5 B" E4 U) K& ~" has in a) more samples are tested and in b) a single capacitor is more stressed.
5 C% |: s* W8 CFrom the technical point of view, it should be acceptable to perform one type test only by applying the& `& V/ s8 U! d
highest test severity for each test.
5 g0 Q/ q; M; gDecision
* }/ x" K3 d" K7 TWhen a range of dual-class capacitors (X/Y) is qualified, it is allowed to perform one type test only, if
E2 t* p* S* I2 u/ h6 ^the highest severity of the X or Y class is applied in each respective test.
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