Repetative cable failure
Repetative cable failure
(OP)
Helo every one:
We have around 500m cable that are connecting and backing up ( during maintenance or interruptions) two 4.16 KV systems. This is a BILCA cable that is rated for 5KV and always energized from one side and open in the other side. It is rarely used, however it fails many times in different locations.
I need your help in investigating and analyzing the cause of such failures if it is related to a phenomena that I am not aware of.
Thanks in advance for the time and advice.
We have around 500m cable that are connecting and backing up ( during maintenance or interruptions) two 4.16 KV systems. This is a BILCA cable that is rated for 5KV and always energized from one side and open in the other side. It is rarely used, however it fails many times in different locations.
I need your help in investigating and analyzing the cause of such failures if it is related to a phenomena that I am not aware of.
Thanks in advance for the time and advice.
H1H2N3F4





RE: Repetative cable failure
I tried Googling it and nothing obvious popped up on page 1.
RE: Repetative cable failure
RE: Repetative cable failure
TTFN

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RE: Repetative cable failure
"...4.16 KV [RMS?, 5.9Kv peak?]... ...rated for 5KV [peak?]..."
I think it's unlikely because some? many? most? voltage-rated items are proofed to twice their rating.
RE: Repetative cable failure
RE: Repetative cable failure
The cable is 3 core armored manufactured in 1961, 5/phase and length around 800 meters. It is laid in a bed of sweet sand direct buried and well protected.
H1H2N3F4
RE: Repetative cable failure
TTFN

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RE: Repetative cable failure
RE: Repetative cable failure
Is the cable rated for 5 kV to ground or 5 kV phase to phase?
Have there ever been lightning strikes in the area? I once saw a 5 kV conductor in PCV conduit buried in the earth. One end of the cable took a lightning strike and the conductors were damaged in multiple locations. After the third failure the conductors were pulled out. The many damaged locations were readily visible. The conductors were replaced.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Repetative cable failure
RE: Repetative cable failure
However,-I guess-the cable was very high overloaded –once or more-by short-circuit current not cleared in time or by a long lasting overload of 50% or more.
I think you have to check the protection setting.