How i am going to drying 18 medium voltage cable 20 kv
How i am going to drying 18 medium voltage cable 20 kv
(OP)
The problem is very simple. I put 18 20kv cables in a basement and after a big rain the base was full with water.
The cables as i search have for at least 10 meters moisture and water inside.
I want to save the cables but i donot know how without to cut them.
The cables as i search have for at least 10 meters moisture and water inside.
I want to save the cables but i donot know how without to cut them.






RE: How i am going to drying 18 medium voltage cable 20 kv
A combination of heat and vacuum may work.
I would apply the vacuum simultaneously to both ends of the cable.
respectfully
RE: How i am going to drying 18 medium voltage cable 20 kv
Any wire or cable product, not containing fillers, that is suitable for wet locations and whose ends have been exposed to water, may be considered a candidate for "purging" (using an
inert gas under pressure to remove water contained in the product) under engineering supervision. If this procedure is employed, the wire or cable should be tested prior to energization. As a minimum, an insulation resistance test with a megohmmeter should be conducted.
Any cable that contains fillers, such as polypropylene, paper, etc., should be replaced if the ends of the product have been exposed to water.
RE: How i am going to drying 18 medium voltage cable 20 kv
What did you mean by vacuum. I do not know if i damaged the cable when i applied a vacuum pump on it.
Do you know a procedure or where to find something relative.
RE: How i am going to drying 18 medium voltage cable 20 kv
RE: How i am going to drying 18 medium voltage cable 20 kv
RE: How i am going to drying 18 medium voltage cable 20 kv
RE: How i am going to drying 18 medium voltage cable 20 kv
tomorrow i am going to try with the nitrogen. i will let you know about the results.
RE: How i am going to drying 18 medium voltage cable 20 kv
RE: How i am going to drying 18 medium voltage cable 20 kv
On the exit end of your cable run the gas through a jar before blowing it out in the atomosphere. There are moisture indicators you can put in the stream.
The indicator I ahve used was a white material composed of small beads that turned blue if there was any moisture around them. When they stayed white it ment the water was out of the cable.
RE: How i am going to drying 18 medium voltage cable 20 kv
Furthermore what you need is 'dry gas' not necessarily (possibly)dangerous nitrogen which can be a suffocating hazard. Most desiccant dryers can produce air that is extremely dry pushing -80F dew points and such.
You can use a standard air compressor an oil filter followed by a large desiccant dryer. Plumb this to the line and then plumb the other end of the cable into the jar as BJC mentions.
Put moisture tainted desiccant beads in the end jar and when they have been dried by the air coming out of the cable it's likely good to go.
Here's a example list of possibilities. (From the hip!)
Grainger
http://www.grainger.com
4ZL23 Coalescing Oil filter
4ZM18 Regulator
5P334 Flow meter
Mcmaster-Carr
http://www.mcmaster.com/
5163K22 Heavy duty dryer with sight window. (I can vouch for this unit.)
5163K48 Gallon can of desiccant beads. Turns pink when wet. Bright blue when dry.
I'd use the Coalescing Oil filter then the regulator then the desiccant dryer then a particulate filter then a flow gage to see what's actually happening then the cable.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: How i am going to drying 18 medium voltage cable 20 kv
Don
RE: How i am going to drying 18 medium voltage cable 20 kv
RE: How i am going to drying 18 medium voltage cable 20 kv
The customer gave me a free access to a tank of nitrogen (free from moisture) The results until now is very good. From each cable i take out at least one lt of pure water. now i am trying to take out and the moisture from the cables.
At the end of this i will propose to my customer to test the cables for dielectric strength of the insulation.
The type of the cables is CU / XLPE / CTS /PVC / AWA / PVC