Time Domain Reflectometry (TDR): Technology Review and Applications

[@sinethembalusawana]

I thought I was just gonna have a look and close the video not knowing that I will end up watching the entire video😁. Thank You I really appreciate how you explained the topic.

[@jluke6861]

Thank you for the Great Video.

[@ProtecEquipmentResources]

Thanks for watching!

[@protossid]

Thank you Sir, very informative video

[@ProtecEquipmentResources]

Glad it was helpful!

[@MarkSeager-dp2kg]

Can TDR be effective for underground non shielded power cables? For example, could a TDR measurement be performed on a PV source circuit, containing 2 500kcmil conductors run underground in conduit?

[@ProtecEquipmentResources]

Hi Mark, thanks for your question. From Bret Hammonds: The technology behind TDRs is ideally suited for two conductors separated by a homogeneous (equivalent) insulation such as what you would find in either a shielded cable or one with a concentric neutral. The case that you have presented is less than ideal for use of a TDR since it is only able to detect very significant changes in impedance such as an open circuit or a short circuit. Having said that, it might be possible under some very unique circumstances for a TDR to be helpful in finding a fault in such a situation as what you have described. Those circumstances would include: - Using either a grounded conductive conduit for your return or the two separate cables that are running through the conduit. In either case you would NOT have a homogeneous (equivalent) impedance throughout the distance of the cable run. AND - A significant fault that is either completely open circuited ( ~ ∞ ohms) or a very low impedance (for all practical purposes considered to be a short circuit between the conductors.) If the fault is a high impedance fault, which is often the case, then the TDR will NOT be able to see the fault without being integrated into a more elaborately featured cable fault locating system.