PDSH 1003 Sampling plan

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PDSH 1003

Sampling plan . Y' C% N) `$ f( J5 R; v* B, ^

4 / 3 + S( T% e. x  L- S2 K( Z

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

Standard(s):
- o; ?. N& l6 @9 G8 k+ W; lIEC 61048/2006
IEC 61049/1991 Ec/1992
Subclause(s): 4 3
9 W4 z6 o: r/ I' d6 R! q$ bNo. Year PDSH 1003 2010
2 o! [9 ]5 U) \, q: O( dCategory: LITE Developed by: ETF5 OSM/LUM
Subject:
9 B0 Y0 m- O0 i! v: Q+ HSampling plan
Key words:
- Capacitance
3 b2 N1 Z4 R" O$ p  z- Self-healing capacitor
0 a8 k* p  ]# k- 50 capacitors
To be approved at the 49th CTL Plenary Meeting, in 2012
Question:
8 s. ~/ y, M; |+ k: _+ _$ IIn § 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
: m  d# u& b% n% @* gsurface area shall also be tested if this ratio exceeds that of the maximum capacitance value in the range
2 \, V/ v8 d' V. ]; ?  A3 tby 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
# p9 ^% A8 `; [" n9 nof the final sampling plan for tests?
Decision:
For the time being, apply the following proposed solution:
+ F# }9 q: {, a0 hWhen the above case occurs, each group referred to in § 11 of IEC 61048 or in § 4 of IEC 61049 shall
2 c. V- e0 n" f6 k& {. a& dcontain as nearly as possible equal numbers of capacitors of the highest capacitance and of capacitors with
1 j6 ~8 ~8 J; \; F1 Q  Ocapacitance per unit surface area exceeding that of the maximum capacitance value in the range by 10%
or greater. Similarly, each of those groups, shall contain as nearly as possible equal numbers of capacitors
+ b. d: d% |% j1 k5 |$ nof the lowest capacitance and of capacitors with capacitance per unit surface area less than that of the
minimum capacitance value in the range by 10% or greater.
' G4 P$ N, j' o; q1 K% OExample – IEC 61048 - § 11 – self-healing capacitor.
A sampling of 50 capacitors is required and according to the above decision they shall be split as follows:
: s6 l6 b, L! @" d; A- 12 (13) capacitors of the highest capacitance in the range;
* P6 H. B) Y6 E8 m$ B: Q0 N! z' S- 13 (12) capacitors with the maximum capacitance per unit surface area exceeding that of the
) n8 _; ]3 J0 z3 t. r  vmaximum value in the range by 10% or greater;
- 12 (13) capacitors of the lowest capacitance in the range;
- 13 (12) capacitors with capacitance per unit surface area less than that of the minimum capacitance
value in the range by 10% or greater.


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