SOUTH AFRICAN NATIONAL STANDARD
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1 ISBN IEC :2007 SOUTH AFRICAN NATIONAL STANDARD Instrument transformers Part 1: General requirements This national standard is the identical implementation of IEC :2007 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 IEC :2007 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS SC 67E, Electricity distribution systems and components Electricity distribution, 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 2013.
3 IEC INTERNATIONAL STANDARD NORME INTERNATIONALE Instrument transformers Part 1: General requirements Transformateurs de mesure Partie 1: Exigences générales INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE PRICE CODE CODE PRIX XB ICS ISBN
4 IEC:2007 CONTENTS FOREWORD Scope Normative references Terms and definitions General definitions Definitions related to dielectric ratings Definitions related to current ratings Definitions related to accuracy Definitions related to other ratings Definitions related to gas insulation Index of abbreviations Normal and special service conditions General Normal service conditions Ambient air temperature Altitude Vibrations or earth tremors Other service conditions for indoor instrument transformers Other service conditions for outdoor instrument transformers Special service conditions General Altitude Ambient temperature Vibrations or earth tremors Earthquakes System earthing Ratings General Highest voltage for equipment Rated insulation levels General Rated primary terminal insulation level Other requirements for primary terminals insulation Between-section insulation requirements Insulation requirements for secondary terminals Rated frequency Rated output Rated accuracy class Design and construction Requirements for liquids used in equipment General Liquid quality Liquid level device Liquid tightness Requirements for gases used in equipment...21
5 IEC: General Gas quality Gas monitoring device Gas tightness Pressure relief device Requirements for solid materials used in equipment Requirements for temperature rise of parts and components General Influence of altitude on temperature-rise Requirements for earthing of equipment General Earthing of the enclosure Electrical continuity Requirements for the external insulation Pollution Altitude Mechanical requirements Multiple chopped impulse on primary terminals Internal arc fault protection requirements Degrees of protection by enclosures General Protection of persons against access to hazardous parts and protection of the equipment against ingress of solid foreign objects Protection against ingress of water Indoor instrument transformers Outdoor instrument transformers Protection of equipment against mechanical impact under normal service conditions Electromagnetic Compatibility (EMC) General Requirement for Radio Interference Voltage (RIV) Requirements for immunity Requirement for transmitted overvoltages Corrosion Markings Fire hazard Tests General Classification of tests List of tests Sequence of tests Type tests General Temperature-rise test Impulse voltage withstand test on primary terminals Wet test for outdoor type transformers Electromagnetic Compatibility (EMC) tests Test for accuracy Verification of the degree of protection by enclosures...40
SOUTH AFRICAN NATIONAL STANDARD
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