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AUTOMATIC GROUND LIABILITY DETECTION AND INDICATION USING INDUSTRIAL APPLICATION

Platform : EMBEDDED

AUTOMATIC GROUND LIABILITY DETECTION AND INDICATION USING INDUSTRIAL APPLICATION

 

 

 

            Control loop failures may be attributed to sustained arcing ground faults that are not interrupted quickly because they involve current levels below normal load current and thus do not activate fuses or circuit breakers. These current levels, while low in comparison to faults involving two or more phases, are still high enough to dissipate substantial energy at the point of the fault, resulting in melting of metal, burning of insulation, and even explosive arcing. Detecting and quickly interrupting these low levels of ground fault current. Earth-fault detection circuit for detecting an earth fault in a circuit supplied by a supply source via supply lines, comprising a current transformer which is to be incorporated in the supply lines. At the output of the current transformer, a current is delivered which is a measure of an earth-fault current occurring in the supplied circuit and/or the supply lines. Connected to the output of the current transformer is a rectifier for obtaining a unidirectional signal, which signal is fed via an integrator to an input of a comparator, to another input of which a reference signal is applied. A detection signal occurs at the output of the comparator if the signal present at the input is greater than the reference signal. The unidirectional signal is fed via a cascade circuit of the integrator and an amplitude limiter to one input of the comparator.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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  • Block Diagram

 

 

 

 

 

 

 

 
 

 

Neutral Line

 

 

 


 

 

 

 

 

 

        ATMEL

         89C51

 

        MICRO-

  CONTROLLER

 

 

 

 

  ZONE-C-B

 

 

 

 

  ZONE-B-Y

 

 

 

 

  ZONE-A-R

 

POWER DISTRIBUTION ZONES

 

 

 

 

 

 

       
     
 
   

 

 

 

 

 

 

 

 

 

 

 

 


 

 

 

Alarm

 

                                   

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

                                                                                                    

 

 


 


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