Medium Voltage Cable inside water

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Sajid khan said:
So No problem You mean.. We can leave it for years?


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Agreed, ours are wet for years. We just replaced some that was installed in the late 70’s. Been wet about all those years.
replaced because it was 15kV and we went to 25kV for a conversion.
 
Hv&Lv said:
Agreed, ours are wet for years. We just replaced some that was installed in the late 70’s. Been wet about all those years.
replaced because it was 15kV and we went to 25kV for a conversion.
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Thumbs up for such reliable cables..


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By the way, I designed systems of approx. 400 manholes -in each one of approx.10 power stations -and we run there about 300 medium voltage cables manufactured as per IEC 60502-2-and no more-no armour and only pvc outer jacket. Theoretically, in each manhole there is a sort of water sink and a system to extract the water, but I never saw it working. The first power station manhole system which I designed was in 1985 and the manholes are almost always full of water. I do not remember it was once a complaint. However, according the standard the cable has to be in less water.
 
Julius Right said:
By the way, I designed systems of approx. 400 manholes -in each one of approx.10 power stations -and we run there about 300 medium voltage cables manufactured as per IEC 60502-2-and no more-no armour and only pvc outer jacket. Theoretically, in each manhole there is a sort of water sink and a system to extract the water, but I never saw it working. The first power station manhole system which I designed was in 1985 and the manholes are almost always full of water. I do not remember it was once a complaint. However, according the standard the cable has to be in less water.
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Thanks@Julis ; you have a wonderful experience, i was just a year old in 1985.
Thanks all for sharing their experiences.
So i concluded that i don’t have to be worried much about the stagnant water in the cable vault.


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I did long term work at an industrial facility with underground 5kV distribution. The manholes and raceways were always filled with water. There were a few cable failures over time, but the number decreased after the plant installed and maintained sump pumps in the manholes.
 
Effectively most of Charleston, SC equipment and cables is underwater for years with no issues.


Water treeing is not electrical treeing necessarily either.
 
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