When we put loads back on the system the temperature of the suspect cable was reading about the same as the others. I kow when it was reading hot they had about 400A at on the primary and when I took the readings after we fixed the terminations they were only at about 300A. So they certainly...
This is not oil insulated cable. How the heck would you refill 300 ft of cable if it was oil filled? That just sounds funny to me.
Not sure what you comment, "you haven't said one important thing" means.
Any way we reterminated the connections from the MC cabel to the overhead wire and things...
I appreciate all the input and am wondering if any of you have the name of any experts out there that I could bring in as a an advisor. I'm looking for some one who has a lot of experience with this type of situation.
Thanks, Hopefully it won't be long and this will be resolved with out incident.
They will be repairing these ASAP and keeping an eye on them until then.
One question I have has to do with the cable that is running hot. I don't think fixing these terminatins will fix the problem with the entire cable being hot, I think there are some issue with the cable still, I also found...
I just looked at some thermal images of the termination of the MC cable conductors to the overhead utility conductors.
I'll try to describe this properly so it makes sense.
I call the utility conductors A, B and C phase layed out from left to right.
I call the three parallel conductors 1, 2...
This plant is in Davenport Iowa. I work out of the corporate office in Madison WI. The incoming 13.8kV is 3 wire and we step it down to 480V 4 wire at the delta/wye transformers.
I'm guessing earth ground is being used as the return ground path for the utility but I am working on finding out...
I only recall seeing the 3 phase conductors on the poles for the overhead feed to the plant. Would the ground be run as a 4th overhead wire from pole to pole? I'm not at this facility so I'm going from what I remember seeing.
The armor on this cable does not have a jacket or outer protective covering so the armor is in direct contact with the cable tray. Wouldn't this ground any current flow through the armor, assuming the cable tray is properly bonded? Of course that might be a faulty assumption, because obviously...
This is all great advice and I will try to get as much of it implimented as safely allowed. Hopefully something will jump out as being the problem.
Thanks again to all of you for your help, it's much appreciated.
It's the armor that is hot. Because I don't have access to the individual conductors, I don't know which conductor is hot. I'm thinking it has to be a conductor generating the heat but I can only touch the armor so that is what I feel as hot. Is there anything that would cause the armor to get...
This is Metal Clad cable with 3 conductors plus ground in each of the 3 parallel cables. So each of the 3 cables has all 3 phases. There is no conduit, the MC cable lays in cable tray.
The cable is MC cable and it was hot the entire length of the cable, 150'+
They are planning on doing an infrared scan this week.
The load seems to be balanced over all but current readings have not been taken on each individual condustor.
There are 3 conductors per phase and the phases seem...
This situation has 3 parallel 3/0 15kV MC cables feeding a productin facility. One of the three cables is very hot to the touch (I couldn't keep my hand on it for more than 10 sec.) while the other two are not even warm. I'm not sure of the age but probably 30+ years.
My first thoughts are bad...
