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Buried cable temperature monitoring

Jam
Hi all,


I am aware of tell-tale temperature stickers that can be placed on cables, conductors etc where overload is suspected. However, once buried this would of course be rather hard to inspect, certainly on a regular basis!


Does anyone have any recommendations for cable temperature monitoring setups that could be retrofitted relatively simply and connected to an existing data acquisition system, posssibly to trigger load reduction if necessary but that might be the advanced course.


I'm thinking of a few thermocouple patches under wraparound sleeving for waterproofing, going into a suitable device above ground, but this kind of sensor isn't my area and I don't want to reinvent the wheel if possible.


Thanks in advance,


J
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  • 0
    I am not aware of any product made for this purpose.

    Two possibilities occur to me.


    Firstly the conductor temperature may be calculated from load current and voltage drop, may need correcting for power factor, and only calculates the AVERAGE temperature and not any hot spots.


    Secondly, several suppliers offer remore temperature sensors, primarily intended to monitor outside air temperatures, one of these could be attached to the cable before burial. Not hugely reliable as it measures the SHEATH temperature and not the CONDUCTOR temperature. Also other parts of the cable may be hotter than the measured point.


    Better practice though would be to use a larger cable and avoid any doubt and worry about cable overheating.

    For a short length the cost is not that great.

    For a greater length the extra cost may become significant, but remember that the larger cable will save energy and give better voltage regulation at the load.


    EDIT TO ADD, it appears that there IS a product made for this purpose, see following post.
Reply
  • 0
    I am not aware of any product made for this purpose.

    Two possibilities occur to me.


    Firstly the conductor temperature may be calculated from load current and voltage drop, may need correcting for power factor, and only calculates the AVERAGE temperature and not any hot spots.


    Secondly, several suppliers offer remore temperature sensors, primarily intended to monitor outside air temperatures, one of these could be attached to the cable before burial. Not hugely reliable as it measures the SHEATH temperature and not the CONDUCTOR temperature. Also other parts of the cable may be hotter than the measured point.


    Better practice though would be to use a larger cable and avoid any doubt and worry about cable overheating.

    For a short length the cost is not that great.

    For a greater length the extra cost may become significant, but remember that the larger cable will save energy and give better voltage regulation at the load.


    EDIT TO ADD, it appears that there IS a product made for this purpose, see following post.
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