SOUTH AFRICAN NATIONAL STANDARD
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1 ISBN Edition 2 IEC :2010 Edition 3 SOUTH AFRICAN NATIONAL STANDARD High-voltage test techniques Part 2: Measuring systems This national standard is the identical implementation of IEC :2010, and is adopted with the permission of the International Electrotechnical Commission. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001 Tel: Fax: SABS
2 Edition 2 IEC :2010 Edition 3 Table of changes Change No. Date Scope National foreword This South African standard was prepared by National Committee SABS/TC 067/SC 04, Electricity distribution systems and components Insulators, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in June This SANS document supersedes SANS :1994 (edition 1 as modified by IEC amdt 1: 1996 and nat. amdt ). Compliance with this document cannot confer immunity from legal obligations. Reaffirmed and reprinted in March This document will be reviewed every five years and be reaffirmed, amended, revised or withdrawn. SABS
3 INTERNATIONAL STANDARD NORME INTERNATIONALE IEC Edition High-voltage test techniques Part 2: Measuring systems Techniques des essais à haute tension Partie 2: Systèmes de mesure INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE PRICE CODE CODE PRIX XB ICS ; ISBN Registered trademark of the International Electrotechnical Commission Marque déposée de la Commission Electrotechnique Internationale
4 Ó IEC:2010 CONTENTS FOREWORD Scope Normative references Terms and definitions Measuring systems Components of a measuring system Scale factors Rated values Definitions related to dynamic behaviour Definitions related to uncertainty Definitions related to tests on measuring systems Procedures for qualification and use of measuring systems General principles Schedule of performance tests Schedule of performance checks Requirements for the record of performance Contents of the record of performance Exceptions Operating conditions Uncertainty Tests and test requirements for an approved measuring system and its components General requirements Calibration Determination of the scale factor Calibration of measuring systems by comparison with a reference measuring system (preferred method) Determination of the scale factor of a measuring system from the scale factors of its components (alternative method) Linearity test Application Alternative methods in order of suitability Dynamic behaviour General Determination of the amplitude/frequency response Reference method for impulse voltage measuring systems Short-term stability Long-term stability Ambient temperature effect Proximity effect Software effect Uncertainty calculation of the scale factor General Uncertainty of the calibration Uncertainty of measurement using an approved measuring system Uncertainty calculation of time parameter measurement (impulse voltages only) General... 30
5 Ó IEC: Uncertainty of the time parameter calibration Uncertainty of time parameter measurement using an approved measuring system Interference test (transmission system and instrument for impulse voltage measurements) Withstand tests of converting device Measurement of direct voltage Requirements for an approved measuring system General Uncertainty contributions Requirement on converting device Dynamic behaviour for measuring voltage changes Tests on an approved measuring system Performance check General Comparison with an approved measuring system Check of the scale factors of the components Measurement of ripple amplitude Requirements Uncertainty contributions Calibrations and tests on an approved ripple voltage measuring system Measurement of the scale factor at the ripple frequency Dynamic behaviour by amplitude/frequency response Performance check for ripple measuring system Measurement of alternating voltage Requirements for an approved measuring system General Uncertainty contributions Dynamic behaviour Tests on an approved measuring system Dynamic behaviour test Performance check General Comparison with an approved measuring system Check of the scale factors of the components Measurement of lightning impulse voltage Requirements for an approved measuring system General Uncertainty contributions Requirement on measuring instrument Dynamic behaviour Connection to the test object Tests on an approved measuring system Performance test on measuring systems Reference method (preferred) Alternative method supplemented by a measurement of the step response according to Annex C Dynamic behaviour test... 43
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