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TIDA-010239: TIDA-010239

Venkatesh B
Intellectual 356 points
Part Number: TIDA-010239
Other Parts Discussed in Thread: TIDA-010237

Hi TI Team,

I have little doubt over Reference design TIDA-010239

Here how RCD fault is detected, how leakage current is sensed, Kindly share details of CT used in primary side to sense leakage current

Kindly share Filtered circuit from CT 

Help me to select any dedicated IC available for RCD sensing and trip circuit

Thank you

venkatesh B

  • 0
    TI__Expert 6525 points

    Hi Venkatesh,

    For RCD, i would recommend tida-010237. The design guide is here.  For the circuit, the schematic is available here.

    In general, if you have all of the mains current carrying conductors going through the flux sensor, the net induced flux through the sensor should be ~0 (current in = current out).  Now, if you have leakage (to gorund, not through the sensor), their will be a net magnetic flux picked up by the sensor.  The reason we need the oscillator circuit is to modulate any DC flux with a AC carrier (the current transformer sensor we selected can only detect AC).  For AC leakage, you don't need the oscillator carrier for the sensor to detect. For DC leakage, you need an oscillator. Once you've modulated the signal, you can filter out the HF carrier and analyze the amplitude of the signal based on detected leakage (DC or 50/60hz line).  There will be some errors based on a number of factors such as sensor material, signal chain gain and offset errors.  

    For single phase applications, you might consider AFE3010.  For 3P applications, consider TIDA-010237.

    -kelvin