• AS 4372-1996

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

    High-voltage alternating current circuit-breakers - Inductive load switching

    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    Superseded date:  30-06-2017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:  01-01-1996

    Publisher:  Standards Australia

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

    1 - AS 4372-1996 HIGH-VOLTAGE ALTERNATING CURRENT CIRCUIT-BREAKERS-INDUCTIVE LOAD SWITCHING
    4 - PREFACE
    5 - CONTENTS
    7 - Section 1: General
    7 - 1.1 Scope
    7 - 1.2 Normative references
    7 - 1.3 Auxiliary voltages and pressures
    7 - Section 2: Transformer magnetizing currents
    7 - 2.1 General
    7 - 2.2 Transformer magnetizing current for circuit-breakers with rated voltages of 100 kV and above
    8 - 2.3 Transformer magnetizing current for circuit-breakers with rated voltages below 100 kV
    8 - Section 3: High-voltage motor switching tests
    8 - 3.1 Applicability
    8 - 3.2 General
    10 - 3.3 Characteristics of the supply circuits
    10 - 3.3.1 Supply circuit A
    10 - 3.3.2 Supply circuit B
    10 - 3.4 Characteristics of the load circuit
    11 - 3.4.1 Motor substitute circuit 1
    11 - 3.4.2 Motor substitute circuit 2
    11 - 3.5 Test voltage
    12 - 3.6 Test duties
    12 - 3.7 Test measurements
    13 - 3.8 Behaviour and condition of circuit-breaker
    13 - 3.9 Test report
    15 - Section 4: Shunt reactor current switching tests
    15 - 4.1 Applicability
    15 - 4.2 General
    15 - 4.3 Test circuits
    17 - 4.4 Characteristics of the supply circuit
    17 - 4.5 Characteristics of the connecting leads
    17 - 4.6 Characteristics of the load circuits
    19 - 4.6.1 Load circuit 1
    19 - 4.6.2 Load circuit 2
    19 - 4.7 Earthing of the test circuit
    19 - 4.8 Test voltage
    20 - 4.9 Test duties
    21 - 4.10 Test measurements
    21 - 4.11 Test results
    21 - 4.12 Test report
    23 - Section 5: Application guide for a.c. high-voltage circuit-breakers for shunt reactor current switching
    23 - 5.1 Appilcability
    23 - 5.2 Purpose
    23 - 5.3 General application conditions
    23 - 5.3.1 Maximum voltage for application
    23 - 5.3.2 Frequency
    24 - 5.3.3 Shunt reactor load current
    24 - 5.3.4 Fault interrupting capability
    24 - 5.3.5 Break time
    24 - 5.3.6 Transient overvoltages
    25 - 5.3.7 Frequency of operation
    25 - 5.4 Switching conditions
    25 - 5.4.1 General
    25 - 5.4.2 Shunt reactor and station characteristics
    25 - 5.4.3 Circuit-breaker characteristics
    26 - 5.5 Directly earthed reactors (basic overvoltage generation phenomena)
    29 - 5.5.1 Current chopping
    30 - 5.5.2 Chopping overvoltages
    31 - 5.5.3 Recovery voltage across circuit-breaker
    32 - 5.5.4 Re-ignitions
    33 - 5.5.5 Re-ignition overvoltages
    36 - 5.5.6 Oscillation modes
    36 - 5.5.7 High-frequency current interruption
    36 - 5.5.8 Multiple re-ignitions and voltage escalation
    37 - 5.5.9 Energizing transients
    37 - 5.6 Unearthed reactors
    38 - 5.6.1 Current chopping
    38 - 5.6.2 Recovery voltage across circuit-breaker
    38 - 5.6.3 Chopping and re-ignition overvoltages
    39 - 5.6.4 Application
    41 - 5.7 Neutral reactor earthed reactors
    42 - 5.7.1 Current chopping
    42 - 5.7.2 Recovery voltage across circuit-breaker
    42 - 5.7.3 Chopping and re-ignition overvoltages
    42 - 5.7.4 Application
    44 - 5.8 Limitation of overvoltages
    44 - 5.8.1 General
    44 - 5.8.2 Shunt reactor surge arrester protection
    47 - 5.8.3 Circuit-breaker auxiliary equipment
    48 - 5.9 Circuit-breaker testing
    49 - 5.9.1 Auxiliary voltages and pressures
    49 - 5.9.2 Load circuits
    49 - 5.9.3 Test duties
    49 - 5.9.4 Criteria for successful testing
    49 - 5.9.5 Evaluation of circuit-breaker characteristics
    50 - 5.10 Circuit-breaker specification
    50 - 5.10.1 Dielectric withstand capability
    50 - 5.10.2 Interrupting current rating
    50 - 5.10.3 Shunt reactor rating
    50 - 5.10.4 Shunt reactor current
    51 - 5.10.5 Load side characteristics
    51 - 5.10.6 Overvoltage limits
    51 - 5.10.7 Earthing arrangement
    51 - 5.10.8 Break time
    52 - 5.10.9 Mechanical endurance
    52 - 5.10.10 Tender information
    53 - Annex A - Shunt reactor characteristics
    53 - A.1 Shunt reactors rated 72,5 kV and above
    54 - A.2 Shunt reactors rated below 72,5 kV
    55 - Annex B - System and station characteristics
    55 - B.1 System characteristics
    55 - B.2 Station characteristics
    57 - Annex C - General derivation of chopping and re-ignition overvoltages
    57 - C.1 General
    57 - C.2 Chopping overvoltages
    60 - C.3 Re-Ignition overvoltages
    63 - Annex D - Oscillation modes
    63 - D.1 General
    63 - D.2 Load side oscillations
    63 - D.3 Re-ignition oscillations
    65 - D.4 Interaction between phases
    68 - Annex E - Application of laboratory test results to actual shunt reactor installations
    68 - E.1 General
    68 - E.2 Overvoltage estimation procedures
    72 - E.3 Case studies
    79 - Annex F - Statistical formulae for derivation of, chopping and re-ignition overvoltages
    79 - F.1 General
    79 - F.2 Chopping number independent of arcing time
    79 - F.3 Chopping number dependent on arcing time
    80 - Annex G - Bibliography

    Abstract - (Show below) - (Hide below)

    Applies to circuit-breakers which are used for switching of transformer magnetizing currents or currents of high-voltage motors and shunt reactors. It also applies to contactors used for switching the currents of high-voltage motors. This Standard is identical with and has been reproduced from IEC 1233:1994.

    Scope - (Show below) - (Hide below)

    This report is applicable to circuit-breakers which are used for switching of:- transformer magnetizing currents, or- currents of high-voltage motors, or - currents of shunt reactors.It is also applicable to contactors used for switching the currents of high-voltage motors.

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

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

    History - (Show below) - (Hide below)

    First published as AS 4372-1996.

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

    AS 2006-1986 High voltage a.c. switchgear and controlgear - Circuit breakers for rated voltages above 1000 V
    AS 1852.441-1985 International electrotechnical vocabulary - Switchgear, controlgear and fuses

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

    AS 62271.100-2005 High-voltage switchgear and controlgear High-voltage alternating current circuit-breakers (IEC 62271-100, Ed. 1.1 (2003) MOD)
    AS/NZS 60265.1:2001 High-voltage switches Switches for rated voltages above 1 kV and less than 52 kV (IEC 60265-1:1998, MOD) (Reconfirmed 2016)
    AS 60470-2001 High-voltage alternating current contactors and contactor-based motor starters (Reconfirmed 2015)
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