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  • AS 1202.3-1976

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    A.C. motor starters (up to and including 1000 V) - Autotransformer starters

    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    Superseded date:  30-06-2017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:  01-01-1976

    Publisher:  Standards Australia

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    This Part of the specification applies to two-step autotransformer starters for industrial use, intended to start in the starting position, accelerate an induction motor to normal speed, provide means for the protection of the motor and its associated circuits against operating overloads, and cause the motor to stop intentionally.NOTE: Autotransformer starters with more than two steps are considered as special cases subject to agreement between purchaser and manufacturer.The autotransformer starters dealt with in this Part are not intended for reversing motors rapidly and, therefore, utilization category AC-4 included in Part 1* does not appear. Moreover, they are not normally designed to interrupt short-circuit currents; therefore, suitable short-circuit protection should form part of the installation but not necessarily in the starter (see Appendix C of Part 1).This Part applies only to starters, the main contacts of which are intended to be connected to circuits the rated voltage of which does not exceed 1000 V a.c.The clauses of this Part relating to overload protection are not applicable to starters operating in conjunction with over-temperature devices built into the motors (see AS 1023, Part 1).NOTES:1. In the starting position, the current in the line and the torque of the motor related to the motor starting with rated voltage are reduced approximately as the square of the ratio (starting voltage)/(rated voltage). Therefore, auto-transformer starters are used when the inrush current due to the starting is to be limited, or when the driven machine requires a limited torque for starting. Typical curves for starting current, of starting torque of the motor, and of torque of the driven machine are shown in Fig. F1).2. In order to avoid too large a peak of current or torque when changing the connection from start to run, it is recommended that this changeover occur only when the motor has reached a speed higher than 80 percent of its rated speed (see Appendix F).

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    Committee EL-006
    Document Type Standard
    Product Note To run concurrently with AS 3947.4.1-1995
    Publisher Standards Australia
    Status Superseded
    Superseded By

    History - (Show below) - (Hide below)

    Under Revision See DR 94015

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

    AS 1966.2-1985 Electric arc welding power sources - Rotary type
    AS 1930-1976 Circuit-breakers for distribution circuits (up to and including 1000 V a.c. and 1200 V d.c.)
    AS 1966.1-1985 Electric arc welding power sources - Transformer type
    AS 2941-1995 Fixed fire protection installations - Pumpset systems
    AS 1418.1-1994 Cranes (including hoists and winches) - General requirements
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