PDSH 1003 Sampling plan

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PDSH 1003

Sampling plan 8 c6 A3 v  ?! b3 S( J+ `3 g( A8 ^- z8 D

4 / 3

61048(ed.2) & 61049(ed.1)

, ?9 _5 @% z. g# W0 T7 Q6 O, NStandard(s):
. E8 x5 j3 S' x9 ^IEC 61048/2006
6 B' y+ p' C" G* L* X6 W8 C9 L6 ]IEC 61049/1991 Ec/1992
Subclause(s): 4 3
No. Year PDSH 1003 2010
8 P: R  B8 c$ ~4 yCategory: LITE Developed by: ETF5 OSM/LUM
Subject:
$ y2 ~- x& }- J9 Z* d) Q5 USampling plan
Key words:
- Capacitance
5 T) ~4 n7 g4 i- u) K- Self-healing capacitor
+ S" l6 W* T: G! m  U- 50 capacitors
To be approved at the 49th CTL Plenary Meeting, in 2012
& e2 e- U0 z9 H& C2 i) N1 I* ~Question:
& M7 d+ a3 n6 ^( }# s* ^In § 4 of IEC 61048 and in § 3 of IEC 61049 rules for the sampling plan are provided. Beside the main
rule, the following additional statement is given: “The capacitor with the maximum capacitance per unit
: a7 u1 u( F* H1 M7 P5 Usurface area shall also be tested if this ratio exceeds that of the maximum capacitance value in the range
by 10% or greater. Similarly, the capacitor with the minimum capacitance per unit area shall also be tested
if this ratio is less than that of the minimum capacitance value in the range by 10% or greater”.
Nevertheless, the sampling plan is not well specified when the above case occurs. What is the composition
of the final sampling plan for tests?
3 ?1 }- d, O3 ^$ P: Q3 oDecision:
For the time being, apply the following proposed solution:
When the above case occurs, each group referred to in § 11 of IEC 61048 or in § 4 of IEC 61049 shall
, z) k; L1 Q0 Q' C. N! v; hcontain as nearly as possible equal numbers of capacitors of the highest capacitance and of capacitors with
capacitance per unit surface area exceeding that of the maximum capacitance value in the range by 10%
/ r2 Q/ D3 |! V" Tor greater. Similarly, each of those groups, shall contain as nearly as possible equal numbers of capacitors
of the lowest capacitance and of capacitors with capacitance per unit surface area less than that of the
6 i' Y) j+ x" wminimum capacitance value in the range by 10% or greater.
. m0 n  g; P3 Q* w# \. MExample – IEC 61048 - § 11 – self-healing capacitor.
1 Y  g) x4 M7 |6 W. z4 q3 x7 K. I) yA sampling of 50 capacitors is required and according to the above decision they shall be split as follows:
0 e! K8 H; A0 w! h4 L7 ^1 i% d- 12 (13) capacitors of the highest capacitance in the range;
- 13 (12) capacitors with the maximum capacitance per unit surface area exceeding that of the
: j+ N2 E% J# X; C. V. dmaximum value in the range by 10% or greater;
0 U) f5 V, b' {- 12 (13) capacitors of the lowest capacitance in the range;
4 L% V5 i4 K% T! U5 S- 13 (12) capacitors with capacitance per unit surface area less than that of the minimum capacitance
# g; ~/ }4 @6 v  w+ Avalue in the range by 10% or greater.
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+ y! K, @, i" A* c- G, G7 h
# s. w! Y4 j: R4 ^4 [. u