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  • AS 1018-1985

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    Partial discharge measurements

    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    Superseded date:  30-06-2017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:  01-01-1985

    Publisher:  Standards Australia

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

    1 - AS 1018-1985 PARTIAL DISCHARGE MEASUREMENTS
    4 - PREFACE
    5 - CONTENTS
    6 - 1. Scope
    7 - 2. Object
    7 - 3. Definitions
    7 - 3.1 Partial discharge
    7 - 3.2 Quantities related to partial discharges
    7 - 3.2.1 General
    7 - 3.2.2 Apparent charge q
    8 - 3.2.3 Repetition rate n
    8 - 3.2.4 Integrated quantities
    8 - 3.3 Specified partial discharge magnitude
    8 - 3.4 Voltages related to partial discharges
    8 - 3.4.1 Partial discharge inception voltage Ui
    8 - 3.4.2 Partial discharge extinction voltage Ue
    9 - 3.4.3 Partial discharge test voltage
    9 - 4. Test circuits and measuring instruments
    9 - 4.1 General requirements
    9 - 4.2 Test circuits
    10 - 4.2.1 Measuring circuit characteristics
    10 - 4.2.2 Scale factor of the test circuit kc
    10 - 4.2.3 Measuring impedance
    11 - 4.2.4 Coupling capacitor
    11 - 4.3 Measuring instruments
    11 - 4.3.1 Scale factor of the measuring instrument ki
    11 - 4.3.2 Instruments for the measurement of apparent charge q
    12 - 4.3.3 Instruments for the measurement of pulse repetition rate n
    12 - 4.3.4 Instruments for the measurement of average discharge current I
    12 - 4.3.5 Instruments for the measurement of quadratic rate D
    12 - 4.3.6 Arrangements for the measurement of discharge power P
    12 - 4.3.7 Use of radio interference meters for the measurement of partial discharges
    13 - 4.4 Non-electrical methods of detection
    13 - 4.4.1 Acoustic detection
    13 - 4.4.2 Visual or optical detection
    13 - 4.4.3 Observations of tracking
    13 - 4.4.4 Dissolved gases in oil
    13 - 5. Calibration
    13 - 5.1 General
    14 - 5.2 Determination of instrument characteristics
    14 - 5.2.1 Calibration of instruments measuring apparent charge q
    15 - 5.2.2 Calibration of instruments measuring integrated quantities
    15 - 5.3 Calibration of the instrument in the complete test arrangement
    16 - 6. Tests
    16 - 6.1 General requirements
    16 - 6.2 Conditioning of the test object
    16 - 6.3 Requirements for the test voltage
    16 - 6.4 Choice of test procedure
    16 - 6.4.1 Determination of the partial discharge inception and extinction voltages
    17 - 6.4.2 Determination of the partial discharge magnitude at a specified test voltage
    17 - 6.5 Measurements on cables and on test objects with windings
    17 - 7. Measuring accuracy and sensitivity
    18 - 8. Disturbances
    18 - 8.1 Sources of disturbances
    18 - 8.2 Detecting disturbances
    19 - 8.3 Reduction of disturbances
    19 - 8.3.1 General
    19 - 8.3.2 Balanced circuits
    19 - 8.3.3 Electronic processing and recovering of signals
    20 - 8.4 Disturbance levels
    20 - 9. Special requirements for partial discharge measurements during tests with direct voltage
    20 - 9.1 General
    21 - 9.2 Quantities related to partial discharges
    21 - 9.3 Voltages related to partial discharges
    21 - 9.3.1 Partial discharge inception and extinction voltages
    21 - 9.3.2 Partial discharge test voltage
    21 - 9.4 Test circuits and measuring instruments
    21 - 9.5 Tests
    21 - 9.5.1 Requirements for the test voltage
    21 - 9.5.2 Choice of test procedure
    22 - 9.6 Disturbances
    23 - APPENDIX A - TEST CIRCUITS
    25 - APPENDIX B - INTEGRATED QUANTITIES
    26 - APPENDIX C - MEASUREMENTS ON CABLES AND ON TEST OBJECTS WITH WINDINGS
    27 - APPENDIX D - THE USE OF RADIO INTERFERENCE METERS FOR THE MEASUREMENT OF PARTIAL DISCHARGES

    Abstract - (Show below) - (Hide below)

    Describes types of measuring instruments, test circuits and methods of measurement of partial discharges in various types of electrical equipment. It is intended principally as a guide for use in the preparation of the relevant standard specifications for such equipment. Specifies requirements and test methods identical with those in IEC 270.

    Scope - (Show below) - (Hide below)

    This standard applies to the measurement of partial discharges during tests with alternating voltage, but general terms, definitions and requirements are usually also applicable for measurement of partial discharges during tests with direct voltage. Some special characteristics of partial discharge measurements under direct voltage are given in a separate clause and necessary references are made throughout the text. This standard is intended principally as a general guide to the drafting of specifications for specific apparatus.Measurements of partial discharges are made for the following main purposes:- to verify that the test object does not exhibit partial discharges greater than a specified magnitude, at a specified voltage;- to determine the voltage amplitude at which partial discharges of a specified low magnitude commence with increasing voltage and cease with decreasing voltage;- to determine the magnitude of the specified discharge quantity at a specified voltage.The partial discharges which are considered in this standard are localized electrical discharges in insulating media, restricted to only a part of the dielectric under test and only partially bridging the insulation between conductors. Discharges mostly occur in the form of individual pulses, which can be detected as electrical pulses in the external circuit connected to the test object. However, a more continuous form may also occur, the so-called pulseless discharge. This form will normally not be detected by the measurement methods described in this standard.Partial discharges may occur in cavities in solid insulation, in gas bubbles in liquid insulation or between layers of insulation with different dielectric characteristics. They may also occur at sharp edges or points of metallic surfaces.Even though they involve only small amounts of energy, partial discharges may lead to progressive deterioration of the dielectric properties of insulating materials; the definition and evaluation of such deterioration, however, is beyond the scope of this standard.Partial discharge measurements on cables and on apparatus having windings, such as transformers, generators and motors, are complicated by attenuation, resonance and travelling wave phenomena. Special requirements for tests on these objects are only briefly dealt with.This standard deals mainly with electrical measurements of partial discharges, but some reference is also made to non-electrical methods.

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

    Committee EL-007
    Document Type Standard
    Publisher Standards Australia
    Status Superseded
    Superseded By
    Supersedes

    History - (Show below) - (Hide below)

    Under Revision see DR 01020 CP

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

    AS 1931.1-1996 High-voltage test techniques - General definitions and test requirements

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

    AS 1429.1-1993 Electric cables - Polymeric insulated - For working voltages 1.9/3.3 (3.6) kV up to and including 19/33 (36) kV
    AS 3726.0-1995 Electromechanical components for electronic equipment - Basic testing procedures and measuring methods Introduction and list of Parts of AS 3726 and IEC 512
    AS 2735-1984 Dry-type power transformers
    AS 2264-1995 A.C. insulation-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 38 kV
    AS 1931.1-1996 High-voltage test techniques - General definitions and test requirements
    AS 1307.2-1996 Surge arresters Metal-oxide surge arresters without gaps for a.c. systems
    AS 1265-1990 Bushings for alternating voltages above 1000 V
    AS/NZS 1660.3:1998 Test methods for electric cables, cords and conductors Electrical tests (Reconfirmed 2017)
    AS 3726.2-1989 Electromechanical components for electronic equipment - Basic testing procedures and measuring methods - General examination, electrical continuity and contact resistance tests, insulation tests and voltage stress tests
    AS 2263-1995 Gas-insulated metal-enclosed switchgear for rated voltages of 72.5 kV and above
    AS 2326.1-1991 On-load tap-changers - Requirements
    AS/NZS 2650:2000 Common specifications for high-voltage switchgear and controlgear standards
    AS 1243-1982 Voltage transformers for measurement and protection
    AS 2374.3.0-1982 Power transformers Insulation levels and dielectric tests - General requirements
    AS 4362.1-1996 High-voltage test techniques for low-voltage equipment Definitions, test and procedure requirements
    AS 2629-1983 Separable insulated connectors for power distribution systems above 1 kV
    AS 2897-1986 Power capacitors - Shunt - Rated voltages above 660 v a.c.
    AS 2802-1992 Electric cables - Reeling and trailing - For mining and general use (other than underground coal mining)
    AS/NZS 1429.1:2000 Electric cables - Polymeric insulated - For working voltages 1.9/3.3 (3.6) kV up to and including 19/33 (36) kV
    AS/NZS 1429.2:1998 Electric cables - Polymeric insulated - For working voltages above 19/33 (36) kV up to and including 76/132 (145) kV
    AS 1013-1971 Shunt capacitors for connection to power frequency systems
    AS 2086-1995 A.C. metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 72.5 kV
    AS 1660.3-1993 Test methods for electric cables, cords and conductors - Electrical tests
    AS 1025.2-1989 High-voltage a.c. switchgear and controlgear - Switches and switch-disconnectors - For rated voltages of 52 kV and above
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