• BS IEC 60076-8:1997

    Current The latest, up-to-date edition.

    Power transformers Application guide

    Available format(s):  Hardcopy, PDF

    Language(s):  English

    Published date:  15-02-1998

    Publisher:  British Standards Institution

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

    1 General
    2 Characteristic properties of different three-phase
        winding combinations and magnetic circuit designs
    3 Characteristic properties and application of auto-
        connected transformers
    4 Zero-sequence properties - neutral load current and earth
        fault conditions, magnetic saturation and inrush current
    5 Calculation of short-circuit currents in three-winding,
        three-phase transformers (separate winding transformers
        and auto-connected transformers) with earth neutrals
    6 Parallel operation of transformers in three-phase systems
    7 Calculation of voltage drop for a specified load,
        three-winding transformer load loss
    8 Specification of rated quantities and tapping quantities
    9 Convertor applications with standard transformers
    10 Guide to the measurement of losses in power transformers
    Annex A Basic relations for single-phase and two-phase
              earth faults

    Abstract - (Show below) - (Hide below)

    Information to help in determining and selecting characteristics of transformers complying with BS 171. Covers tapping quantities, winding connections, parallel operation, loading capability of the neutral point and calculation of voltage drop or rise for a specified load condition.

    Scope - (Show below) - (Hide below)

    This Standard applies to power transformers complying with the series of publications IEC 60076.

    It is intended to provide information to users about:

    • certain fundamental service characteristics of different transformer connections and magnetic circuit designs, with particular reference to zero-sequence phenomena;

    • system fault currents in transformers with YNynd and similar connections;

    • parallel operation of transformers, calculation of voltage drop or rise under load, and calculation of load loss for three-winding load combinations;

    • selection of rated quantities and tapping quantities at the time of purchase, based on prospective loading cases;

    • application of transformers of conventional design to converter loading;

    • measuring technique and accuracy in loss measurement.

    Part of the information is of a general nature and applicable to all sizes of power transformers. Several chapters, however, deal with aspects and problems which are of the interest only for the specification and utilization of large high-voltage units.

    The recommendations are not mandatory and do not in themselves constitute specification requirements.

    Information concerning loadability of power transformers is given in IEC 60354, for oil­ immersed transformers, and IEC 60905, for dry-type transformers.

    Guidance for impulse testing of power transformers is given in IEC 60722.

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

    Committee PEL/14
    Development Note Supersedes 92/23463 DC and BS 5953-1(1980). (06/2005)
    Document Type Standard
    Publisher British Standards Institution
    Status Current

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

    IEC TR 60909-1:2002 Short-circuit currents in three-phase a.c. systems - Part 1: Factors for the calculation of short-circuit currents according to IEC 60909-0
    IEC 60354:1991 Loading guide for oil-immersed power transformers
    IEC 60722:1982 Guide to the lightning impulse and switching impulse testing of power transformers and reactors
    IEC 60076-3:2013 Power transformers - Part 3: Insulation levels, dielectric tests and external clearances in air
    IEC 60050-421:1990 International Electrotechnical Vocabulary (IEV) - Part 421: Power transformers and reactors
    IEC 60076-1:2011 Power transformers - Part 1: General
    IEC 60909:1988 Short-circuit current calculation in three-phase a.c. systems
    IEC 60905:1987 Loading guide for dry-type power transformers
    ISO 9001:2015 Quality management systems — Requirements
    IEC 60289:1988 Reactors
    IEC 61378-1:2011 Converter transformers - Part 1: Transformers for industrial applications
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