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 1: General definitions and test requirements 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 approved 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 March This SANS document supersedes SANS :1998 (edition 1 as modified by IEC corr.:1992 and nat. amdt 1:2007). Compliance with this document cannot confer immunity from legal obligations. Reaffirmed and reprinted in September This document will be reviewed every five years and be reaffirmed, amended, revised or withdrawn.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 1: General definitions and test requirements Technique des essais à haute tension Partie 1: Définitions et exigences générales 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 IEC:2010 CONTENTS FOREWORD Scope Normative references Terms and definitions Definitions related to characteristics of discharges Definitions relating to characteristics of the test voltage Definitions relating to tolerance and uncertainty Definitions relating to statistical characteristics of disruptive-discharge voltage values Definitions relating to classification of insulation in test objects General requirements General requirements for test procedures Arrangement of the test object in dry tests Atmospheric corrections in dry tests Standard reference atmosphere Atmospheric correction factors for air gaps Application of correction factors Correction factor components Measurement of atmospheric parameters Conflicting requirements for testing internal and external insulation Wet tests Wet test procedure Atmospheric corrections for wet tests Artificial pollution tests Tests with direct voltage Definitions for direct voltage tests Test voltage Requirements for the test voltage Generation of the test voltage Measurement of the test voltage Measurement of the test current Test procedures Withstand voltage tests Disruptive-discharge voltage tests Assured disruptive-discharge voltage tests Tests with alternating voltage Definitions for alternating voltage tests Test Voltage Requirements for the test voltage Generation of the test voltage Measurement of the test voltage Measurement of the test current Test procedures Withstand voltage tests Disruptive-discharge voltage tests Assured disruptive-discharge voltage tests...25
5 IEC: Tests with lightning-impulse voltage Definitions for lightning-impulse voltage tests Test Voltage Standard lightning-impulse voltage Tolerances Standard chopped lightning-impulse voltage Special lightning-impulse voltages Generation of the test voltage Measurement of the test voltage and determination of impulse shape Measurement of current during tests with impulse voltages Test Procedures Withstand voltage tests Procedures for assured disruptive-discharge voltage tests Tests with switching-impulse voltage Definitions for switching-impulse voltage tests Test voltage Standard switching-impulse voltage Tolerances Time-to-peak evaluation Special switching-impulse voltages Generation of the test voltage Measurement of test voltage and determination of impulse shape Measurement of current during tests with impulse voltages Test procedures Tests with combined and composite voltages Definitions for combined- and composite-voltage tests Tolerances Generation Measurement Composite test voltages Parameters Tolerances Generation Measurement Test procedures...43 Annex A (informative) Statistical treatment of test results...45 Annex B (normative) Procedures for calculation of parameters of standard lightningimpulse voltages with superimposed overshoot or oscillations...54 Annex C (informative) Guidance for implementing software for evaluation of lightningimpulse voltage parameters...59 Annex D (informative) Background to the introduction of the test voltage factor for evaluation of impulses with overshoot...62 Annex E (informative) The iterative calculation method in the converse procedure for the determination of atmospheric correction factor...68 Bibliography...73 Figure 1 Recommended minimum clearance D of extraneous live or earthed objects to the energized electrode of a test object, during an a.c. or positive switching impulse test at the maximum voltage U applied during test...12
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