How does power supply company locate a fault?
on 23/01/2018, Brian Gaff supposed :
Underground cables are the most difficult of course as there is no way to find where the break is unless there is a tell tale crater in the ground nearby of course! Actually there is - They can send a pulse down a cable then measure the time for the pulse to be reflected. Time = distance to fault. It is commonly used on telephone cables too. |
How does power supply company locate a fault?
On 23/01/2018 17:55, Harry Bloomfield wrote:
on 23/01/2018, Brian Gaff supposed : Underground cables are the most difficult of course as there is no way to find where the break is unless there is a tell tale crater in the ground nearby of course! Actually there is - They can send a pulse down a cable then measure the time for the pulse to be reflected. Time = distance to fault. It is commonly used on telephone cables too. Early ehernet transceivers had built in TDR circuits so you could find faults. I don't know when they were phased out. |
How does power supply company locate a fault?
dennis@home wrote:
Early ehernet transceivers had built in TDR circuits so you could find faults. I don't know when they were phased out. I realise you're probably talking about thin/thick wire coax, but some of the present-day Broadcom NICs have a driver mode that can tell cable length, and a spectrum analysis of each of the four pairs. |
How does power supply company locate a fault?
On 23/01/18 21:54, dennis@home wrote:
On 23/01/2018 17:55, Harry Bloomfield wrote: on 23/01/2018, Brian Gaff supposed : Underground cables are the most difficult of course as there is no way to find where the break is unless there is a tell tale crater in the ground nearby of course! Actually there is - They can send a pulse down a cable then measure the time for the pulse to be reflected. Time = distance to fault. It is commonly used on telephone cables too. Early ehernet transceivers had built in TDR circuits so you could find faults. I don't know when they were phased out. I've got some servers that can estimate the cable length, so those transceivers have something in them - but it may be a clever trick with signal processing rather than dedicated TDR? |
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