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Original question:

Leakage Current in the circuit Ground Plane

tidu873a

Hanno Reimer
Intellectual 1510 points
Other Parts Discussed in Thread: TIDA-00440

- I would like to measure a leakage current of two partial voltages symmetrically suspended against ground / earth -> Is this possible with the board?
- I would like to monitor / measure the insulation resistance of a line (PASS / FAIL) -> Is this possible with the board?

  • 0
    TI__Genius 9790 points

    Hanno,

    Are you talking about the board of TIDA-00440?

    Yunsheng

  • 0
    TI__Mastermind 26830 points

    Hello Hanno,

    TIDU873 is the TI literature number for the User Guide document for the TIDA-00440 reference design. TIDA-00440 is the actual Leakage Current Measurement board assembly.

    The way your questions are phrased makes me think you wish to measure leakage currents of insulation on live equipment.

    Please be very clear that the PMP-00440 is intended to measure insulation resistance on UNENERGIZED equipment.  You must not attempt to measure wires or lines with live voltages on them.  All external voltage sources must be completely removed before making any resistance measurements between any two points.

    That being said, most leakage measurements are made between an unenergized line or wire or winding and the frame or ground or another winding to assess the leakage between them.  It should work whether the conductor arrangement is symmetric or asymmetric.  The TIDA-00440 design measurement output is a voltage which represents a level of current which is indicative of the insulation resistance value.  Higher voltage indicates lower resistance and more leakage. A Pass/Fail criterion can be set up at any voltage threshold that you choose. 

    Regards,
    Ulrich 

  • 0 in reply to Ulrich Goerke
    TI__Intellectual 1510 points

    Hello Ulrich, 

    thanks, yes the measurement has to do done on live equipment. Any suggestion, e.g. app note, how to do that? 

    ciao 
    Hanno 

  • 0 in reply to Hanno Reimer
    TI__Mastermind 26830 points

    Hello Hanno,

    I'm sorry, but such measurements cannot be done on live equipment. It is completely unsafe and is very likely to damage the measurement board.  TIDA-00440 is not designed for testing live circuits.

    Unfortunately, I cannot advise you on such test equipment. I suggest that you conduct a web search to see if such test equipment exists.

    Regards,
    Ulrich