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    AS 2735-1984

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    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    Dry-type power transformers

    Available format(s):  Hardcopy, PDF 1 User, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Superseded date:  30-06-2017

    Language(s):  English

    Published date:  01-01-1984

    Publisher:  Standards Australia

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

    1 - AS 2735-1984 DRY-TYPE POWER TRANSFORMERS
    4 - PREFACE
    4 - CONTENTS
    5 - SECTION 1. SCOPE AND GENERAL
    5 - 1.1 SCOPE.
    5 - 1.2 APPLICATION.
    5 - 1.3 REFERENCED DOCUMENTS.
    5 - 1.4 SERVICE CONDITIONS.
    5 - 1.4.1 Normal service condi tions.
    5 - 1.4.2 Provision for unusual service conditions.
    5 - 1.5 DEFINITIONS.
    6 - 1.5.1 General.
    6 - 1.5.2 Terms relating to the containment of a dry-type transformer.
    6 - 1.6 TAPPINGS AND CONNECTIONS.
    6 - 1.6.1 General.
    6 - 1.6.2 Tapping range.
    6 - 1.6.3 Connections.
    6 - 1.7 REQUIREMENTS WITH REGARD TO ABILITY TO WITHSTAND SHORT-CIRCUIT.
    7 - SECTION 2. RATING
    7 - 2.1 GENERAL.
    7 - 2.2 RATED POWER.
    7 - 2.3 PREFERRED VALUES OF RATED POWER.
    7 - 2.4 OPERATION OF HIGHER THAN RATED VOLTAGE.
    7 - 2.5 RATING PLATES.
    7 - 2.5.1 General.
    7 - 2.5.2 Information to be given in all cases.
    7 - 2.5.3 Information to be given for sealed units only.
    8 - SECTION 3. COOLING METHODS AND TEMPERATURE RISE
    8 - 3.1 IDENTIFICATION ACCORDING TO COOLING METHOD.
    8 - 3.1.1 Identification symbols.
    8 - 3.1.2 Arrangement of symbols.
    8 - 3.2 TEMPERATURE-RISE LIMITS.
    8 - 3.2.1 Normal temperature-rise limits.
    8 - 3.2.2 Reduced temperature rises for transformers designed for high cooling air temperatures or special air coding conditions.
    8 - 3.2.3 Reduced temperature rises for transformers designed for high altitudes.
    10 - SECTION 4. INSULATION LEVELS
    10 - 4.1 INSULATION LEVELS.
    10 - 4.1.1 General.
    10 - 4.1.2 Transformers for use at high altitudes.
    11 - SECTION 5. TESTS
    11 - 5.1 GENERAL REQUIREMENTS FOR TYPE, ROUTINE AND SPECIAL TESTS.
    11 - 5.1.1 General.
    11 - 5.1.2 Measurement of winding resistance (routine test)
    11 - 5.1.3 Measurement of voltage ratio and check of voltage vector relationship (routine test).
    11 - 5.1.4 Measurement of impedance voltage (principal tapping) short-circuit impedance and load loss (routine test).
    11 - 5.1.5 Measurement of no-load loss and current (routine test).
    11 - 5.1.6 Separate-source voltage withstand test (routine test).
    11 - 5.1.7 Induced overvoltage withstand test (routine test).
    11 - 5.1.8 Lightning impulse test (type test).
    11 - 5.1.9 Partial discharge measurement.
    12 - 5.1.10 Temperature-rise test (type test).
    13 - 5.1.11 Winding temperature-rise correction for reduced current.
    13 - 5.1.12 Determination of constant temperature conditions.
    13 - 5.2 MEASUREMENT OF SOUND LEVEL (SPECIAL TEST).
    13 - 5.3 SHORT-CIRCUIT TEST (SPECIAL TEST).
    13 - 5.4 MEASUREMENT OF ZERO SEQUENCE IMPEDANCE (SPECIAL TEST).
    13 - 5.5 TOLERANCES.
    14 - SECTION 6. ENCLOSURES
    14 - 6.1 DEGREE OF PROTECTION PROVIDED BY ENCLOSURES.
    15 - APPENDIX A - INFORMATION REQUIRED WITH ENQUIRY AND ORDER
    15 - A1 RATING AND GENERAL DATA.
    15 - A1.1 Normal.
    15 - A1.2 Special.
    16 - A2 PARALLEL OPERATION.
    16 - A3 TESTS.
    17 - APPENDIX B - UNUSUAL ENVIRONMENTAL CONDITIONS

    Abstract - (Show below) - (Hide below)

    Specifies requirements for dry-type power transformers (including autotransformers) having highest voltage for equipment values up to and including 36 kV. This Standard should be read in conjunction with AS 2374, Power transformers. Where Australian Standards do not exist for other particular power transformers, This Standard may be applicable as a whole or in parts.

    Scope - (Show below) - (Hide below)

    This standard specifies requirements for dry-type power transformers (including auto-transformers) having highest voltage for equipment values up to and including 36 kV.The following small and special dry-type transformers are not covered by this standard:(a) Single-phase transformers rated at less than 1 kV.A and polyphase transformers rated at less than 5 kV.A.(b) Instrument transformers (covered by AS 1243 and AS 1675).(c) Transformers for semiconductor converters (AS 1955).(d) Starting transformers.(e) Testing transformers.(f) Traction transformers mounted on rolling stock.(g) Flameproof transformers.(h) Welding transformers.(j) Voltage regulating transformers.(k) Small power transformers in which safety is a special consideration.Where Australian standards do not exist for the transformers mentioned above or for other special transformers, this standard may be applicable as a whole or in parts.

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

    Committee EL-008
    Document Type Standard
    Publisher Standards Australia
    Status Superseded
    Superseded By
    Supersedes
    Under Revision

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

    AS 1955.2-1978 Semiconductor convertors Semiconductor self-commutated convertors
    AS 2374.3.0-1982 Power transformers Insulation levels and dielectric tests - General requirements
    AS 2374.1-1997 Power transformers General
    AS 1243-1982 Voltage transformers for measurement and protection
    AS 2374.3.1-1992 Power transformers Insulation levels and dielectric test - External clearances in air
    AS 2768-1985 Electrical insulating materials - Evaluation and classification based on thermal endurance
    AS 1018-1985 Partial discharge measurements
    AS 2374.2-1997 Power transformers Temperature rise
    AS 1675-1986 Current transformers - Measurement and protection
    AS 1939-1990 Degrees of protection provided by enclosures for electrical equipment (IP Code)
    AS 2374.6-1994 Power transformers - Determination of transformer and reactor sound levels
    AS 1824.1-1995 Insulation co-ordination Definitions, principles and rules
    AS 2374.4-1982 Power transformers - Tappings and connections
    AS 1824.2-1985 Insulation coordination (phase-to-earth and phase-to-phase, above 1 kV) - Application guide
    AS 2374.5-1982 Power Transformers Ability To Withstand Short-Circuit
    AS 1955.3-1983 Semiconductor Convertors Semiconductor Direct D.C. Convertors (D.C. Chopper Convertors)
    AS 1955.1-1977 Semiconductor Convertors General

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

    AS 60076.1-2005 Power transformers General (IEC 60076-1, Ed. 2.1 (2000) MOD)
    AS 3953-1996 Loading guide for dry-type power transformers
    AS 2374.6-1994 Power transformers - Determination of transformer and reactor sound levels
    AS 2374.1.2-2003 Power transformers Minimum Energy Performance Standard (MEPS) requirements for distribution transformers (Reconfirmed 2016)
    AS 2374.1-1997 Power transformers General
    AS 3953-1991 Loading guide for dry-type power transformers
    AS 61330-2005 High-voltage/low-voltage prefabricated substations
    AS 1028-1992 Power reactors and earthing transformers
    AS 2374.2-1997 Power transformers Temperature rise
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