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  1. #1
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    : Dec 2007
    : 137
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    : 1,058











    -
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    - ( )




    : Process





    - Load
    - Control circuit
    - Actuators

    Power circuit Control circuit


    Combinational logic Boolean algebra





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  2. #2
    :
    : Dec 2007
    : 137
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    : 1,058



    Power circuit





    :

    Voltage difference - Current - Frequency - Power factor - Phase sequence



    Relay Over/Under voltage relay

    Voltage monitoring relay



    Power circuit





    :

    Voltage difference - Current - Frequency - Power factor - Phase sequence



    Relay Over/Under voltage relay

    Voltage monitoring relay


        . 

:	27159510.jpg 
:	314 
:	88.8  
:	1548

       

  3. #3
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    : Dec 2007
    : 137
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    : 1,058



    Contact




    Load Short circuit current protection Short circuit trip current

    40 65

    Overload or Over current







    100 - 500



    Solid state fuses

    Cylinder style fuses Cone style fuses Blade style fuses









       

  4. #4
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    : Dec 2007
    : 137
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    : 1,058














    Short circuit trip current








    Thermal overload ( 12 16 )









    Sealing

    Under current protection Contact


       

  5. #5
    :
    : Dec 2007
    : 137
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    : 1,058



    Over/Under Current relay







    ( / ) ( - )








    ( - - ... ) 0.75 1.00

    ( )







    Harmonics













       

  6. #6
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    : Dec 2007
    : 137
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    Contactors and Relays



    24 110 230 380

    5 12 24 48 110 220

    Ith

    1 2 3 4 NC-NO

    ( )














    Solid stat relay SSR

    Thyristor










    PLC PLC PLC DIN Rail







       

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