EN 61358:1996
(Main)Acceptance inspection for direct connected alternating current static watt-hour meters for active energy (classes 1 and 2)
Acceptance inspection for direct connected alternating current static watt-hour meters for active energy (classes 1 and 2)
Applies to newly manufactured direct connected alternating current static watt-hour meters of classes 1 and 2, covered by EN 61036, which are produced and delivered in quantities of 50 and above. They provide for 100 % inspection or sampling inspection for acceptance by the purchaser.
Annahmeprüfung von elektronischen Wechselstrom-Wirkverbrauchzählern für direkten Anschluß (Klassen 1 und 2)
Contrôle de réception des compteurs statiques d'énergie active pour courant alternatif et à branchement direct (classes 1 et 2)
S'applique aux compteurs statiques d'énergie active pour courant alternatif, neufs, des classes 1 et 2, à branchement direct spécifiés dans la EN 61036, fabriqués et livrés par lots de 50 unités et plus. Elles définissent des règles d'acceptation par l'acheteur, soit par un contrôle à 100 %, soit par un contrôle par échantillonnage.
Prevzemna kontrola za statične števce električne delovne energije izmeničnega toka za direktno priključitev (razreda 1 in 2) (IEC 1358:1996)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-april-1997
3UHY]HPQDNRQWUROD]DVWDWLþQHãWHYFHHOHNWULþQHGHORYQHHQHUJLMHL]PHQLþQHJD
WRND]DGLUHNWQRSULNOMXþLWHY UD]UHGDLQ ,(&
Acceptance inspection for direct connected alternating current static watt-hour meters for
active energy (classes 1 and 2)
Annahmeprüfung von elektronischen Wechselstrom-Wirkverbrauchzählern für direkten
Anschluß (Klassen 1 und 2)
Contrôle de réception des compteurs statiques d'énergie active pour courant alternatif et
à branchement direct (classes 1 et 2)
Ta slovenski standard je istoveten z: EN 61358:1996
ICS:
17.220.20 0HUMHQMHHOHNWULþQLKLQ Measurement of electrical
PDJQHWQLKYHOLþLQ and magnetic quantities
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
NORME
CEI
INTERNATIONALE IEC
INTERNATIONAL
Première édition
STANDARD
First edition
1996-04
Contrôle de réception des compteurs statiques
d'énergie active pour courant alternatif et
à branchement direct (classes 1 et 2)
Acceptance inspection for direct connected
alternating current static watt-hour meters
for active energy (classes 1 and 2)
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1358 ©IEC:1996 – 3 –
CONTENTS
Page
FOREWORD 7
INTRODUCTION 9
Clause
1 Scope 11
2 General remarks 11
3 Normative references 13
4 Definitions 15
5 Acceptance conditions for batches 19
5.1 100 % inspection 19
5.2 Sampling inspection 19
6 Place of inspection 19
7 Test conditions 21
7.1 Reference conditions 21
7.2 Uncertainty of measurement 23
7.3 Cover and seal 23
8 Inspection and test procedure 23
8.1 Preheating 23
8.2 Test no. 1: AC voltage test 23
8.3 Test no. 2: Test of no-load condition 25
8.4 Test no. 3: Test of starting condition 27
8.5 Tests nos. 4 to 9: Tests of accuracy requirements 27
8.6 Test no. 10: Verification of meter constant 27
9 Requirements corresponding to different inspection procedures 29
9.1 100 % inspection 29
9.2 Sampling inspection 29
Tables
1 Reference conditions 21
2 Uncertainty of measurement 23
3 AC voltage tests 25
4 Starting current 27
1358 ©IEC:1996 — 5 —
Page
Tables
5 Test points and limits of errors 27
6 Acceptance number c 29
7 Example of using random numbers 31
8 Sampling plans 33
9 Double sampling plan 37
10 Specified values for the standard deviation method 41
11 Specified values for the average range method 43
12a Operating characteristic curves N<_
100 46
12b Operating characteristic curves 101 N <_ 500 47
12c Operating characteristic curves 501 s N <_ 1 000 48
13a Acceptance trapezium, T. 3,5 % 49
13b Acceptance trapezium, T. 3,0 % 50
13c Acceptance trapezium, T. 2,5 % 51
14 Inspection sheet 52
15 Random numbers 53
Figures
1 Diagram of the single sampling plan 35
2 Diagram of the double sampling plan 39
3 Acceptance trapezium (standard deviation method) 41
4 Acceptance trapezium (average range method) 43
Annexes
A Symbols 55
B Bibliography 58
1358 ©IEC:1996 — 7 —
INTERNATIONAL ELECTROTECHNICAL COMMISSION
ACCEPTANCE INSPECTION FOR DIRECT CONNECTED ALTERNATING
CURRENT STATIC WATT-HOUR METERS FOR ACTIVE ENERGY
(CLASSES 1 AND 2)
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization
comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to
promote international cooperation on all questions concerning standardization in the electrical and
electronic fields. To this end and in addition to other activities, the IEC publishes International Standards.
Their preparation is entrusted to technical committees; any IEC National Committee interested in
the subject dealt with may participate in this preparatory work. International, governmental and
non-governmental organizations liaising with the IEC also participate in this preparation. The IEC
collaborates closely with the International Organization for Standardization (ISO) in accordance with
conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of the IEC on technical matters, express as nearly as possible an
international consensus of opinion on the relevant subjects since each technical committee has
representation from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the
form of standards, technical reports or guides and they are accepted by the National Committees in that
sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the
subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 1358 has been prepared by IEC technical committee 13:
Equipment for electrical energy measurement and load control.
The text of this standard is based on the following documents:
FDIS Report on voting
13/1093/FDIS 13/1110/RVD
Full information on the voting for the approval of this standard can be found in the repo rt
on voting indicated in the above table.
Annex A forms an integral pa of this standard.
rt
Annex B is for information only.
1358 ©IEC:1996 – 9 –
INTRODUCTION
This International Standard describes, in some detail, methods for acceptance inspection,
and testing of newly manufactured static watt-hour meters delivered in quantities of
50 and above. IEC 514 serves as a reference document and annex A of that standard
should be consulted for explanatory notes concerning sampling procedures.
In this standard, wider error limits than those for type tests specified in the relevant
publications have been allowed because:
- acceptance testing conditions have wider tolerances than those for type tests;
– displacing of the zero axis is not applicable for acceptance testing;
–
the effects of handling of meters are taken into account.
1358 ©IEC:1996 – 11 –
ACCEPTANCE INSPECTION FOR DIRECT CONNECTED ALTERNATING
CURRENT STATIC WATT-HOUR METERS FOR ACTIVE ENERGY
(CLASSES 1 AND 2)
1 Scope
The methods and procedures included in this International Standard apply to newly manu-
factured direct connected alternating current static watt-hour meters of classes 1 and 2,
covered by IEC 1036, which are produced and delivered in quantities of 50 and above.
They provide for 100 % inspection or sampling inspection for acceptance by the purchaser.
2 General remarks
2.1 Two methods of acceptance inspection are proposed, namely:
– 100 % inspection, and
– sampling inspection.
2.2 The 100 % inspection consists of testing all the meters of a batch.
2.3 The sampling inspection is based upon the principles of mathematical statistics and
as a consequence certain specified risks are undertaken both by the manufacturer and
the purchaser. However, sampling inspection generally is more economical than 100 %
inspection.
In this standard, sampling inspection has been planned so that, in practice, the quality
of the meter batches can be judged with nearly the same confidence as with 100 %
inspection.
2.4 Two methods of sampling inspection are described:
– inspection by attributes;
- inspection by variables.
These two methods have been chosen so that the judgement of quality is virtually the
same for both methods.
2.5 Inspection by attributes gives results indicating conformity or non-conformity.
It shall be applied when the characteristics under inspection cannot be measured.
It shall also be applied when a characteristic can be measured but the values are not of
normal distribution (Laplace-Gauss).
It may be applied, when the distribution is approximately normal, in place of inspection by
variables.
The advantage of inspection by attributes is its simplicity of application.
1358 ©IEC:1996 - 13 -
2.6 Inspection by
variables gives additional information but it is applicable only when the
values of a characteristic are measurable and when those values are approximately
normally distributed. In these circumstances, inspection by variables is the recommended
method.
The advantage of inspection by variables is a smaller sample size than by attributes for
the same risk of decision. However, it requires more calculation.
The test results are represented by:
= sample mean as an estimation of the batch mean;
s =
standard deviation as an estimation of the dispersion of the characteristics x in
= average range the batch.
NOTE - The average range is easier to calculate than the standard deviation. However, when suitable
calculating means are available for making a decision and for preparing additional information, the use of
the standard deviation enables the efficiency of the method to be increased for the same sample size.
2.7 Inspection by variables is based on normally distributed values. It is recommended to
test whether the sample is normally distributed, using e.g. :
- The "w/s" test of David, Hartley and Pearson.
For details of the test procedures see [i]*
w(x
For this test only the figures - x ) and s are needed.
max min
- The Wilk-Shapiro test.
For details of the test procedures see [2].
-
The Pearson chi-square test.
3 Normative references
The following normative documents contain provisions which, through reference in this
text, constitute provisions of this International Standard. At the time of publication, the
editions indicated were valid. All normative documents are subject to revision, and pa
rties
to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated
below. Members of IEC and ISO maintain registers of currently valid International
Standards.
IEC 410: 1973,
Sampling plans and procedures for inspection by attributes
IEC 514: 1975, Acceptance inspection of Class 2 alternating-current watthour meters
IEC 1036: 1990,
Alternating current static watt-hour meters for active energy (classes 1
and 2)
ISO 3534-1: 1993, Statistics - Vocabulary and symbols - Pa rt
1: Probability and general
statistical terms
ISO 3534-2: 1993,
Statistics - Vocabulary and symbols - Part 2: Statistical quality control
• Figures in square brackets refer to the bibliography given in annex B.
1358 © IEC:1996 -15 -
4 Definitions
For the purpose of this International Standard, the following definitions apply.
For definitions concerning meters, reference is made to IEC 1036. The majority of the defi-
nitions of sampling techniques are generally in accordance with [3] and with ISO 3534-1
and ISO 3534-2.
4.1 batch: Definite quantity of meters of the same type, of the same voltage and current
rating and the same register, delivered by one supplier, manufactured or produced under
conditions which are presumed uniform.
4.2 batch size: Number N of meters in a batch. [ISO]
4.3 sample: Meters taken at random for inspection from a batch.
4.4
sample size: Number n of meters in the sample. [ISO]
4.5 100 % inspection: Inspection of every meter in a batch.
4.6 sampling inspection: Inspection of a limited number of meters, taken at random
from the batch, according to a prescribed sampling plan. [ISO, modified]
4.7 sampling plan: Plan according to which one or more samples are taken to obtain
information and possibly to reach a decision. [ISO, modified]
4.8 characteristic (quality characteristic): Property (e.g. dielectric strength, starting,
accuracy at one test point) of a meter which contributes to the quality and which helps
to differentiate between the meters of a given batch. The differentiation may be either
quantitative (by variable) or qualitative (by attributes).
If it is measurable, its value for a given meter i is indicated by xi. [ISO, modified]
4.9 defect: Failure of a meter to meet a standard with respect to a characteristic. [ISO]
modified]
4.10 defective meter: Meter having one or more defects. [ISO, modified]
4.11 Curve showing, for a given sampling plan, the
operating characteristic curve:
probability of acceptance of a batch as a function of its actual quality for a given charac-
teristic. [ISO, modified]
4.12 inspection by attributes: Inspection whereby ce rtain characteristics of the sample
meters are evaluated, classified as conforming or not conforming to the requirements, the
number of defective meters counted and used as the basis for judgement of the batch
(EOQC).
1358 © IEC:1996 –17 –
4.13 acceptance number:
Maximum permitted number of defects in a sample for in-
spection by attributes.
4.14 inspection by variables:
Inspection whereby certain characteri
...
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