Skip to content
Please enter a keyword to search

  • IEC 60050-421:1990

    Current The latest, up-to-date edition.

    International Electrotechnical Vocabulary (IEV) - Part 421: Power transformers and reactors

    Available format(s):  Hardcopy, PDF, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Language(s):  English

    Published date:  15-10-1990

    Publisher:  International Electrotechnical Committee

    Add To Cart

    Table of Contents - (Show below) - (Hide below)

    FOREWORD
    PREFACE
    Section
    1 General terms
    2 Terminals
    3 Windings
    4 Rating
    5 Tappings
    6 Losses and no-load current
    7 Impedance voltage, short-circuit impedance and
       voltage drop
    8 Temperature rise
    9 Insulation
    10 Connections
    11 On-load tap-changers
    12 On-load tap-changer motor-drive mechanisms
    INDEX

    Abstract - (Show below) - (Hide below)

    It has the status of a horizontal standard in accordance with IEC Guide 108.

    General Product Information - (Show below) - (Hide below)

    Committee TC 1
    Development Note Also numbered as BS 4727-2:GRP04(1991). (07/2005)
    Document Type Standard
    Publisher International Electrotechnical Committee
    Status Current

    Standards Referenced By This Book - (Show below) - (Hide below)

    CEI EN 60027-7 : 2011 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 7: POWER GENERATION, TRANSMISSION AND DISTRIBUTION
    CLC/TR 60919-2 : 2010 PERFORMANCE OF HIGH-VOLTAGE DIRECT CURRENT (HVDC) SYSTEMS WITH LINE-COMMUTATED CONVERTERS - PART 2: FAULTS AND SWITCHING
    12/30257150 DC : 0 BS EN 62770 - FLUIDS FOR ELECTROTECHNICAL APPLICATIONS - UNUSED NATURAL ESTERS LIQUIDS FOR TRANSFORMERS AND SIMILAR ELECTRICAL EQUIPMENT
    UNE-EN 61378-1:2012 Convertor transformers -- Part 1: Transformers for industrial applications
    CEI 14-4/8 : 2001 POWER TRANSFORMERS - APPLICATION GUIDE
    07/30167951 DC : 0 BS EN 60076-1 - POWER TRANSFORMERS - PART 1: GENERAL
    BS EN 60310 : 2016 RAILWAY APPLICATIONS - TRACTION TRANSFORMERS AND INDUCTORS ON BOARD ROLLING STOCK (IEC 60310:2016)
    BS PD IEC TR 60919-2 : 2008 PERFORMANCE OF HIGH-VOLTAGE DIRECT CURRENT (HVDC) SYSTEMS WITH LINE-COMMUTATED CONVERTERS - PART 2: FAULTS AND SWITCHING
    I.S. EN 61869-6:2016 INSTRUMENT TRANSFORMERS - PART 6: ADDITIONAL GENERAL REQUIREMENTS FOR LOW-POWER INSTRUMENT TRANSFORMERS
    IEC 60137 REDLINE : 7ED 2017 INSULATED BUSHINGS FOR ALTERNATING VOLTAGES ABOVE 1000 V
    EN 60137:2017 INSULATED BUSHINGS FOR ALTERNATING VOLTAGES ABOVE 1000 V (IEC 60137:2017)
    BS EN 61558-1 : 2005 SAFETY OF POWER TRANSFORMERS, POWER SUPPLIES, REACTORS AND SIMILAR PRODUCTS - PART 1: GENERAL REQUIREMENTS AND TESTS
    IEC 60139:2000 Preparation of outline drawings for cathode-ray tubes, their components, connections and gauges
    EN 61558-1:2005/A1:2009 SAFETY OF POWER TRANSFORMERS, POWER SUPPLIES, REACTORS AND SIMILAR PRODUCTS - PART 1: GENERAL REQUIREMENTS AND TESTS
    EN 61642 : 1997 INDUSTRIAL A.C. NETWORKS AFFECTED BY HARMONICS - APPLICATION OF FILTERS AND SHUNT CAPACITORS
    EN 61869-6 : 2016 INSTRUMENT TRANSFORMERS - PART 6: ADDITIONAL GENERAL REQUIREMENTS FOR LOW-POWER INSTRUMENT TRANSFORMERS (IEC 61869-6:2016)
    EN 61378-1:2011 CONVERTOR TRANSFORMERS - PART 1: TRANSFORMERS FOR INDUSTRIAL APPLICATIONS (IEC 61378-1:2011)
    04/30111589 DC : 0
    BS IEC 60076-8 : 1997 POWER TRANSFORMERS - APPLICATION GUIDE
    16/30336914 DC : 0 BS EN 60076-57-129 ED 1.0 - CONVERTOR TRANSFORMERS - PART 57-129: TRANSFORMERS FOR HVDC APPLICATIONS
    13/30265253 DC : 0 BS EN 60214-1 ED 2 - TAP-CHANGERS - PART 1: PERFORMANCE REQUIREMENTS AND TEST METHODS
    NF EN 60027-7 : 2011 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 7: POWER GENERATION, TRANSMISSION AND DISTRIBUTION
    CEI EN 60076-3 : 2015 POWER TRANSFORMERS - PART 3: INSULATION LEVELS, DIELECTRIC TESTS AND EXTERNAL CLEARANCES IN AIR
    NF EN 61378-1 : 2014 CONVERTOR TRANSFORMERS - PART 1: TRANSFORMERS FOR INDUSTRIAL APPLICATIONS
    BS EN 61642 : 1998 INDUSTRIAL A.C. NETWORKS AFFECTED BY HARMONICS - APPLICATION OF FILTERS AND SHUNT CAPACITORS
    18/30368743 DC (published 2018-04) BS EN 60947-6-2. Low-voltage switchgear and controlgear Part 6-2. Multiple function equipment. Control and protective switching devices (or equipment) (CPS)
    08/30178668 DC : DRAFT FEB 2008 BS EN 61378-1 - CONVERTER TRANSFORMERS - PART 1: TRANSFORMERS FOR INDUSTRIAL APPLICATIONS
    I.S. EN 60310:2016 RAILWAY APPLICATIONS - TRACTION TRANSFORMERS AND INDUCTORS ON BOARD ROLLING STOCK
    CSA E61558.1:2012 SAFETY OF POWER TRANSFORMERS, POWER SUPPLIES, REACTORS AND SIMILAR PRODUCTS - PART 1: GENERAL REQUIREMENTS AND TESTS
    CAN/CSA-E61558-1:12 (R2017) Safety of power transformers, power supplies, reactors and similar products - Part 1: General requirements and tests (Adopted IEC 61558- 1:1997 + A1:1998, edition 2.1, 2009-04 with Canadian deviations) | Sécurité des transformateurs, alimentations, bobines d\'inductance et produits analogues - Partie 1: Exigences générales et essais (norme CEI 61558-1:1997 + A1:1998 adoptée, édition 2.1, 2009-04 avec exigences propres au Canada)
    I.S. EN 60137:2017 INSULATED BUSHINGS FOR ALTERNATING VOLTAGES ABOVE 1000 V
    CEI EN 61378-1 : 2012 CONVERTOR TRANSFORMERS - PART 1: TRANSFORMERS FOR INDUSTRIAL APPLICATIONS
    DIN 40108:2003-06 ELECTRIC POWER TECHNOLOGY - CURRENT SYSTEMS - CONCEPTS, QUANTITIES, LETTER SYMBOLS
    IEC 60137:2017 RLV Insulated bushings for alternating voltages above 1000 V
    VDE 0560-430 : 1998 INDUSTRIAL A.C. NETWORKS AFFECTED BY HARMONICS - APPLICATION OF FILTERS AND SHUNT CAPACITORS
    DIN EN 61642 : 1998 INDUSTRIAL A.C. NETWORKS AFFECTED BY HARMONICS - APPLICATION OF FILTERS AND SHUNT CAPACITORS
    CEI EN 62770 : 2014 FLUIDS FOR ELECTROTECHNICAL APPLICATIONS - UNUSED NATURAL ESTERS FOR TRANSFORMERS AND SIMILAR ELECTRICAL EQUIPMENT
    UNE-EN 60137:2011 Insulated bushings for alternating voltages above 1 000 V
    BS EN 62770:2014 Fluids for electrotechnical applications. Unused natural esters for transformers and similar electrical equipment
    BS EN 60214-1:2014 Tap-changers Performance requirements and test methods
    14/30271248 DC : 0 BS EN 60310 ED 4.0 - RAILWAY APPLICATIONS - TRACTION TRANSFORMERS AND INDUCTORS ON BOARD ROLLING STOCK
    14/30302848 DC : 0 BS EN 60076-57-1202 - POWER TRANSFORMERS - PART 57-1202: LIQUID IMMERSED PHASE-SHIFTING TRANSFORMERS
    IEC/IEEE 60076-57-129:2017 Power transformers - Part 57-129: Transformers for HVDC applications
    BS EN 60137 : 2017 INSULATED BUSHINGS FOR ALTERNATING VOLTAGES ABOVE 1000 V
    BS EN 60633 : 1999 TERMINOLOGY FOR HIGH-VOLTAGE DIRECT CURRENT (HVDC) TRANSMISSION
    IEC 61558-1:2017 Safety of transformers, reactors, power supply units and combinations thereof - Part 1: General requirements and tests
    IEC 60633:1998+AMD1:2009+AMD2:2015 CSV Terminology for high-voltage direct current (HVDC) transmission
    IEC 60076-3:2013+AMD1:2018 CSV POWER TRANSFORMERS - PART 3: INSULATION LEVELS, DIELECTRIC TESTS AND EXTERNAL CLEARANCES IN AIR
    IEC 62770:2013 Fluids for electrotechnical applications - Unused natural esters for transformers and similar electrical equipment
    I.S. EN 60076-3:2013 POWER TRANSFORMERS - PART 3: INSULATION LEVELS, DIELECTRIC TESTS AND EXTERNAL CLEARANCES IN AIR
    S.R. CLC/TR 60919-2:2010 PERFORMANCE OF HIGH-VOLTAGE DIRECT CURRENT (HVDC) SYSTEMS WITH LINE-COMMUTATED CONVERTERS - PART 2: FAULTS AND SWITCHING
    10/30232718 DC : 0 BS EN 60076-3 - POWER TRANSFORMERS - PART 3: INSULATION LEVELS, DIELECTRIC TESTS AND EXTERNAL CLEARANCES IN AIR
    BS EN 61378-1:2011 Convertor transformers Transformers for industrial applications
    BS EN 60076-1 : 2011 POWER TRANSFORMERS - PART 1: GENERAL
    BS EN 60079-6:2007 EXPLOSIVE ATMOSPHERES - PART 6: EQUIPMENT PROTECTION BY BY LIQUID IMMERSION 'O'
    16/30318517 DC : 0 BS EN 60137 ED. 7.0 - INSULATED BUSHINGS FOR ALTERNATING VOLTAGES ABOVE 1000 V
    I.S. EN 60633:1999 TERMINOLOGY FOR HIGH-VOLTAGE DIRECT CURRENT (HVDC) TRANSMISSION
    I.S. EN 60027-7:2010 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 7: POWER GENERATION, TRANSMISSION AND DISTRIBUTION
    I.S. EN 61642:1999 INDUSTRIAL A.C. NETWORKS AFFECTED BY HARMONICS - APPLICATION OF FILTERS AND SHUNT CAPACITORS
    I.S. EN 62770:2014 FLUIDS FOR ELECTROTECHNICAL APPLICATIONS - UNUSED NATURAL ESTERS FOR TRANSFORMERS AND SIMILAR ELECTRICAL EQUIPMENT
    CEI EN 60076-1 : 2015 POWER TRANSFORMERS - PART 1: GENERAL
    IEC 61558-1 REDLINE : 3ED 2017 SAFETY OF TRANSFORMERS, REACTORS, POWER SUPPLY UNITS AND COMBINATIONS THEREOF - PART 1: GENERAL REQUIREMENTS AND TESTS
    IEC 60079-6:2015 Explosive atmospheres - Part 6: Equipment protection by liquid immersion "o"
    IEC 61378-1:2011 Converter transformers - Part 1: Transformers for industrial applications
    UNE-EN 60079-6:2016 Explosive atmospheres - Part 6: Equipment protection by liquid immersion "o"
    UNE-EN 60076-1:2013 Power transformers - Part 1: General
    IEC 61747-1:1998+AMD1:2003 CSV Liquid crystal and solid-state display devices - Part 1: Generic specification
    IEC 60076-1:2011 Power transformers - Part 1: General
    15/30328159 DC : 0 BS EN 61558-1 - SAFETY OF POWER TRANSFORMERS, POWER SUPPLIES, REACTORS AND SIMILAR PRODUCTS - PART 1: GENERAL REQUIREMENTS AND TESTS
    IEC 60310:2016 Railway applications - Traction transformers and inductors on board rolling stock
    IEC 60214-1:2014 Tap-changers - Part 1: Performance requirements and test methods
    IEC 60027-7:2010 Letter symbols to be used in electrical technology - Part 7: Power generation, transmission and distribution
    BS EN 61869-6 : 2016 INSTRUMENT TRANSFORMERS - PART 6: ADDITIONAL GENERAL REQUIREMENTS FOR LOW-POWER INSTRUMENT TRANSFORMERS
    UNE-EN 62770:2014 Fluids for electrotechnical applications - Unused natural esters for transformers and similar electrical equipment
    CEI CLC/TR 60919-2 : 2013 PERFORMANCE OF HIGH-VOLTAGE DIRECT CURRENT (HVDC) SYSTEMS WITH LINE-COMMUTATED CONVERTERS - PART 2: FAULTS AND SWITCHING
    BS EN 60027-7 : 2010 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 7: POWER GENERATION, TRANSMISSION AND DISTRIBUTION
    IEC 60137:2017 Insulated bushings for alternating voltages above 1000 V
    IEC TR 60919-2:2008+AMD1:2015 CSV Performance of high-voltage direct current (HVDC) systems withline-commutated converters - Part 2: Faults and switching
    CSA E61558.1 : 2012 : INC : UPD 1 : 2014 SAFETY OF POWER TRANSFORMERS, POWER SUPPLIES, REACTORS AND SIMILAR PRODUCTS - PART 1: GENERAL REQUIREMENTS AND TESTS
    I.S. EN 60076-1:2011 POWER TRANSFORMERS - PART 1: GENERAL (IEC 60076-1:2011)
    BS EN 60076-3 : 2013 POWER TRANSFORMERS - PART 3: INSULATION LEVELS, DIELECTRIC TESTS AND EXTERNAL CLEARANCES IN AIR
    I.S. EN 60079-6:2015 EXPLOSIVE ATMOSPHERES - PART 6: EQUIPMENT PROTECTION BY LIQUID IMMERSION 'O'
    I.S. EN 61378-1:2011 CONVERTOR TRANSFORMERS - PART 1: TRANSFORMERS FOR INDUSTRIAL APPLICATIONS (IEC 61378-1:2011)
    CEI EN 60137 : 2009 INSULATED BUSHINGS FOR ALTERNATING VOLTAGES ABOVE 1000 V
    UNE-EN 60214-1:2015 Tap-changers - Part 1: Performance requirements and test methods
    I.S. EN 60214-1:2014 TAP-CHANGERS - PART 1: PERFORMANCE REQUIREMENTS AND TEST METHODS
    EN 60633:1999/A2:2015 TERMINOLOGY FOR HIGH-VOLTAGE DIRECT CURRENT (HVDC) TRANSMISSION (IEC 60633:1998/A2:2015)
    IEC 61869-6:2016 Instrument transformers - Part 6: Additional general requirements for low-power instrument transformers
    EN 62770 : 2014 FLUIDS FOR ELECTROTECHNICAL APPLICATIONS - UNUSED NATURAL ESTERS FOR TRANSFORMERS AND SIMILAR ELECTRICAL EQUIPMENT (IEC 62770:2013)
    EN 60027-7 : 2010 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 7: POWER GENERATION, TRANSMISSION AND DISTRIBUTION
    EN 60139 : 2001 PREPARATION OF OUTLINE DRAWINGS FOR CATHODE-RAY TUBES, THEIR COMPONENTS, CONNECTIONS AND GAUGES
    EN 60214-1:2014 TAP-CHANGERS - PART 1: PERFORMANCE REQUIREMENTS AND TEST METHODS (IEC 60214-1:2014)
    EN 60076-1:2011 POWER TRANSFORMERS - PART 1: GENERAL (IEC 60076-1:2011)
    EN 60079-6:2015 Explosive atmospheres - Part 6: Equipment protection by liquid immersion "o"
    DIN EN 61558-2-17 : 1998 SAFETY OF POWER TRANSFORMERS, POWER SUPPLY UNITS AND SIMILAR - PART 2-17: PARTICULAR REQUIREMENTS FOR TRANSFORMERS FOR SWITCH MODE POWER SUPPLIES
    EN 60310:2016/AC:2018-03 RAILWAY APPLICATIONS - TRACTION TRANSFORMERS AND INDUCTORS ON BOARD ROLLING STOCK (IEC 60310:2016/COR1:2018)
    EN 60076-3:2013/A1:2018 POWER TRANSFORMERS - PART 3: INSULATION LEVELS, DIELECTRIC TESTS AND EXTERNAL CLEARANCES IN AIR (IEC 60076-3:2013/A1:2018)
    View more information

    • Access your standards online with a subscription

      Features

      • Simple online access to standards, technical information and regulations
      • Critical updates of standards and customisable alerts and notifications
      • Multi - user online standards collection: secure, flexibile and cost effective