Power Cable Partial Breakage Test. How?

[VLFit]

Some countries cable testing standards for Mining applications call for a "partial breakage" test of the conductor. A 10% breakage, or deterioration must be measurable. What instrument is or can be used for this test? A resistance measurement won't work, using the Ohm Check Concentric Neutral Tester wont do it, nor will a tdr. A 1000' cable can have 50% of its core broken over ten feet and the small local area change of resistance and continuity wont be discernable in the measurement over the entire length of the cable. Maybe a combination of the Ohm Check and a tdr, the way Concentric Neutrals should be tested, would do it, but probably not. Any help?
Thanks

 

[catserveng]

This is the only one I have come across, but never have seen used in the US,

http://adrettest.com/wp-content/uploads/2020/03/PB201.pdf

MikeL.

 

[VLFit]

Thank you for the info. I am familiar with Arno and his company, Adret. This test is required in the AS/NVS standards.
Thanks again.
Mike P