PDSH 1003 Sampling plan

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PDSH 1003 2 F0 g- o* T0 u  S9 y, [

Sampling plan 4 X, H' C$ u3 l7 H2 g+ F, q( }

4 / 3 : Q9 L. R4 V; Q

61048(ed.2) & 61049(ed.1) ; S& ?$ ]3 H' ?! S& {2 F0 M; u1 A

Standard(s):
* c& n( `, R5 mIEC 61048/2006
' X$ J0 t  j0 u# M. x5 ~IEC 61049/1991 Ec/1992
3 S4 @7 X* i" [- U8 A9 p4 CSubclause(s): 4 3
No. Year PDSH 1003 2010
Category: LITE Developed by: ETF5 OSM/LUM
Subject:
' o6 U4 a/ i$ QSampling plan
Key words:
- Capacitance
- Self-healing capacitor
- 50 capacitors
To be approved at the 49th CTL Plenary Meeting, in 2012
Question:
# u6 x# x% i& R& sIn § 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
% X- E3 z0 O2 _, d" `surface 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
* V/ z' t* V; m, aif 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
6 D% j* u. g7 Q# [' {of the final sampling plan for tests?
8 g$ E) f: n1 F- {# O, p9 iDecision:
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
contain as nearly as possible equal numbers of capacitors of the highest capacitance and of capacitors with
: j! v6 r7 [0 L8 p3 r$ P1 kcapacitance per unit surface area exceeding that of the maximum capacitance value in the range by 10%
3 G/ _$ C9 {0 n0 A4 O2 nor greater. Similarly, each of those groups, shall contain as nearly as possible equal numbers of capacitors
' ]9 R# v# O# K* B; nof the lowest capacitance and of capacitors with capacitance per unit surface area less than that of the
5 N/ A0 q0 x$ Iminimum capacitance value in the range by 10% or greater.
! z- E" n: O' e0 SExample – IEC 61048 - § 11 – self-healing capacitor.
3 C% B1 C2 V# \( E+ d4 F& GA sampling of 50 capacitors is required and according to the above decision they shall be split as follows:
( `: g# u5 W) t# m/ o6 J2 ~- 12 (13) capacitors of the highest capacitance in the range;
$ f3 A( ^; C# |1 {- 13 (12) capacitors with the maximum capacitance per unit surface area exceeding that of the
maximum value in the range by 10% or greater;
- 12 (13) capacitors of the lowest capacitance in the range;
; }, P' b9 [; h& `- 13 (12) capacitors with capacitance per unit surface area less than that of the minimum capacitance
' s" o& [, \/ H/ S& svalue in the range by 10% or greater.
$ T  S/ e8 j- }: ~6 T) k