• BS 7625(1993) : 1993

    Withdrawn A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.

    SPECIFICATION FOR VOLTAGE TRANSFORMERS

    Available format(s):  Hardcopy, PDF

    Withdrawn date:  15-12-1999

    Language(s):  English

    Published date:  01-01-1993

    Publisher:  British Standards Institution

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

    Committees responsible
    National foreword
    Foreword
    Chapter I: General requirements applicable to all
                  voltage transformers
    Section one - General
    1 Scope
    2 General requirements
    3 Service conditions
    4 Definitions
    Section two - Rating and performance
                           requirements applicable to all
                           voltage transformers
    5 Standard values of rated voltages
    6 Standard values of rated output
    7 Standard values of rated voltage factor
    8 Limits of temperature rise
    9 Insulation requirements
    9a Short-circuit withstand capability
    Section three - Tests - General
    10 Classification of tests
    Section four - Type tests
    11 Temperature-rise test
    12 Short-circuit withstand capability test
    13 Impulse tests on primary winding
    14 Wet test for outdoor type transformers
    Section five - Routine tests
    15 Verification of terminal markings
    16 Power-frequency tests on primary windings and
         measurement of partial discharges
    17 Power-frequency tests between sections and on
         secondary windings
    Section six - Special tests
    18 Chopped lightning-impulse test on primary windings
    Section seven - Marking
    19 Rating plate markings
    Section eight - Terminal markings
    20 General
    21 Markings
    Chapter II: Additional requirements for single-phase
                  measuring voltage transformers
    Section nine - General
    22 Scope
    23 Definitions
    Section ten - Accuracy requirements
    24 Accuracy class designation
    25 Limits of voltage error and phase displacement
    Section eleven - Tests for accuracy
    26 Type tests
    26a Routine tests
    Section twelve - Marking
    27 Marking of the rating plate of a measuring voltage
         transformer
    Chapter III: Additional requirements for single-phase
                  protective voltage transformers
    Section thirteen - General
    28 Scope
    29 Definitions
    Section fourteen - Accuracy requirements
    30 Accuracy class designation
    31 Limits of voltage error and phase displacement
    Section fifteen - Requirements for secondary
                           windings intended to produce a
                           residual voltage
    32 Rated secondary voltages
    33 Rated output
    34 Accuracy class
    Section sixteen - Tests for accuracy
    35 Type tests
    36 Routine tests
    Section seventeen - Marking
    37 Marking of the rating plate of a protective voltage
         transformer
    Chapter IV: Additional requirements for capacitor
                  voltage transformers
    Section eighteen - General
    38 Scope
    39 General requirements
    40 Definitions
    Section nineteen - Rating and performance
                           requirements
    41 Standard reference range of frequency
    42 Standard values of rated output
    Section twenty - Accuracy requirements
    43 Standard accuracy classes
    44 Limits of voltage error and phase displacement
    Section twenty-one - Effects of transients
    45 Ferro-resonance
    46 Transient response
    Section twenty-two - Coupling device
    47 Carrier-frequency coupling device
    Section twenty-three - Tests
    48 General
    Section twenty-four - Type tests
    49 Temperature-rise test
    50 Impulse test
    51 Ferro-resonance tests
    52 Transient response test
    53 Tests for accuracy
    Section twenty-five - Routine tests
    54 Power-frequency tests
    55 Tests for accuracy
    Section twenty-six - Marking
    56 Marking of the rating plate of a capacitor voltage
         transformer
    Figures
    Appendices
    A Typical and equivalent diagrams for a capacitor
         voltage transformer
    B Main condition allowing tests on the equivalent
         circuit
    C Burdens for the transient response tests
    D Use of the equivalent circuit for the routine tests
         for accuracy
    Annexes
    ZA (normative) Other international publications quoted
         in this standard with the references of the
         relevant European publications
    ZB (informative) B-Deviations
    National annexes
    NA (informative) Original IEC text amended by CENELEC
         common modifications
    NB (informative) Cross-references

    Abstract - (Show below) - (Hide below)

    Gives requirements for voltage transformers. Applies to new voltage transformers for use with electrical measuring instruments and electrical protective devices at frequencies of 15 Hz to 100 Hz. The requirements can apply to auto transformers. Does not apply to transformers for use in laboratories. Coverage includes definitions, markings and type tests. Also includes diagrams and appendices.

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

    Committee PEL/59
    Development Note Supersedes BS 3941(1975) (07/2004)
    Document Type Standard
    Publisher British Standards Institution
    Status Withdrawn
    Superseded By
    Supersedes

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

    BS EN 61116 : 1995 ELECTROMECHANICAL EQUIPMENT GUIDE FOR SMALL HYDROELECTRIC INSTALLATIONS
    BS 7729(1994) : 1994 SPECIFICATION FOR INSTRUMENT TRANSFORMERS - THREE-PHASE VOLTAGE TRANSFORMERS FOR VOLTAGE LEVELS HAVING UP TO 52 KV
    BS EN 60041 : 1995 FIELD ACCEPTANCE TESTS TO DETERMINE THE HYDRAULIC PERFORMANCE OF HYDRAULIC TURBINES, STORAGE PUMPS AND PUMP-TURBINES
    BS EN 61268 : 1996 ALTERNATING CURRENT STATIC VAR-HOUR METERS FOR REACTIVE ENERGY (CLASSES 2 AND 3)

    Standards Referencing This Book - (Show below) - (Hide below)

    IEC 60085:2007 Electrical insulation - Thermal evaluation and designation
    IEC 60050-321:1986 International Electrotechnical Vocabulary (IEV) - Part 321: Instrument transformers
    IEC 60071-2:1996 Insulation co-ordination - Part 2: Application guide
    IEC 60044-4:1980 Instrument transformers - Part 4: Measurement of partial discharges
    IEC 60060-1:2010 High-voltage test techniques - Part 1: General definitions and test requirements
    IEC 60071-1:2006+AMD1:2010 CSV Insulation co-ordination - Part 1: Definitions, principles and rules
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