IEC 62475:2010

High-current test techniques - Definitions and requirements for test currents and measuring systems

IEC 62475:2010 is applicable to high-current testing and measurements on both high-voltage and low-voltage equipment. It deals with steady-state and short-time direct current (as e.g. encountered in high-power d.c. testing), steady-state and short-time alternating current (as e.g. encountered in high-power a.c. testing), and impulse-current. In general, currents above 100 A are considered in this International Standard, although currents less than this can occur in tests. This standard also covers fault detection during, for example, lightning impulse testing.

Techniques des essais à haute intensité - Définitions et exigences relatives aux courants d'essai et systèmes de mesure

La CEI 62475:2010 s'applique aux essais et mesures à haute intensité sur des matériels haute et basse tensions. Elle couvre les essais à haute intensité en courant continu et courant alternatif en régime établi et de courte durée ainsi que des essais de courant de choc. De manière générale, la présente Norme internationale prend en compte des courants de plus de 100 A, même si des intensités moindres peuvent apparaître dans les essais. La présente norme couvre également la détection de défauts, comme par exemple dans le cadre d'essais aux chocs de foudre.

General Information

• Status: Published
• Publication Date: 28-Sep-2010
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 19.080 - Electrical and electronic testing
• Technical Committee: TC 42 - High-voltage and high-current test techniques
• Drafting Committee: MT 12 - TC 42/MT 12
• Current Stage: PPUB - Publication issued
• Start Date: 31-Oct-2010
• Completion Date: 29-Sep-2010

Standards Content (Sample)

IEC 62475 ®
Edition 1.0 2010-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
High-current test techniques – Definitions and requirements for test currents
and measuring systems
Techniques des essais à haute intensité – Définitions et exigences relatives
aux courants d'essai et systèmes de mesure

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IEC 62475 ®
Edition 1.0 2010-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
High-current test techniques – Definitions and requirements for test currents
and measuring systems
Techniques des essais à haute intensité – Définitions et exigences relatives
aux courants d'essai et systèmes de mesure

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XE
CODE PRIX
ICS 19.080 ISBN 978-2-88912-184-7
– 2 – 62475 © IEC:2010
CONTENTS
FOREWORD.8
1 Scope.10
2 Normative references .10
3 Terms and definitions .10
3.1 Measuring systems.11
3.2 Components of a measuring system .11
3.3 Scale factors .12
3.4 Rated values .13
3.5 Definitions related to the dynamic behaviour .13
3.6 Definitions related to uncertainty .14
3.7 Definitions related to tests on measuring systems .16
4 Procedures for qualification and use of a measuring system.17
4.1 General principles .17
4.2 Schedule of performance tests .17
4.3 Schedule of performance checks.17
4.4 Requirements for the record of performance.18
4.4.1 Contents of the record of performance.18
4.4.2 Exceptions.18
4.5 Operating conditions .18
4.6 Uncertainty.19
5 Tests and test requirements for an approved measuring system.20
5.1 General requirements.20
5.2 Calibration – Determination of the scale factor .20
5.2.1 Calibration of a measuring system by comparison with a reference
measuring system (preferred method) .20
5.2.2 Determination of the scale factor of a measuring system from those
of its components .24
5.3 Linearity test .25
5.3.1 Application .25
5.3.2 Alternative methods in order of suitability .26
5.4 Dynamic behaviour.26
5.5 Short-term stability .27
5.5.1 Method .27
5.5.2 Steady-state current .27
5.5.3 Impulse current and short-time current .28
5.5.4 Periodic impulse current and periodic short-time current.28
5.6 Long-term stability.29
5.7 Ambient temperature effect .29
5.8 Effect of nearby current paths .30
5.9 Software effect .32
5.10 Uncertainty calculation .32
5.10.1 General .32
5.10.2 Uncertainty of calibration .32
5.10.3 Uncertainty of measurement using an approved measuring system .33
5.11 Uncertainty calculation of time-parameter measurements (impulse currents
only).34
5.11.1 General .34

62475 © IEC:2010 – 3 –
5.11.2 Uncertainty of the time-parameter calibration.34
5.11.3 Uncertainty of a time-parameter measurement using an approved
measuring system .35
5.12 Interference test .36
5.12.1 Application .36
5.12.2 Current-converting shunts and current transformers with iron .37
5.12.3 Inductive measuring systems without iron (Rogowski coils) .38
5.13 Withstand tests .38
5.13.1 Voltage withstand tests.38
5.13.2 Current withstand tests.39
6 Steady-state direct current .39
6.1 Application .39
6.2 Terms and definitions .39
6.3 Test current.39
6.3.1 Requirements .39
6.3.2 Tolerances .39
6.4 Measurement of the test current .40
6.4.1 Requirements for an approved measuring system.40
6.4.2 Uncertainty contributions .40
6.4.3 Dynamic behaviour .40
6.4.4 Calibrations and tests on an approved measuring system.40
6.4.5 Performance check.41
6.5 Measurement of ripple amplitude.41
6.5.1 Requirements for an approved measuring system.41
6.5.2 Uncertainty contributions .41
6.5.3 Dynamic behaviour for ripple .41
6.5.4 Calibrations and tests on an approved ripple-current measuring
system.42
6.5.5 Measurement of the scale factor at the ripple frequency .42
6.5.6 Performance check for ripple current measuring system .42
6.6 Test procedures .43
7 Steady-state alternating current.43
7.1 Application .43
7.2 Terms and definitions .43
7.3 Test current.43
7.3.1 Requirements .
...