Recent content by OSR

If you look that image closely there is letters for cable arrangement. There is four single core cables per phase. Current was 4000 A total per phase. Left side: ABCCBA ABCCBA Right side: AABBCC AABBCC I think that my simulation model probably doesn't involve mutual impedance at all; instead...

I made a simple current density simulation with Ansoft Maxwell, as there was an issue with the element limit in QuickField student version. In the image below, on the left, is the arrangement as per the 'balance of parallel cables' document, and on the right is a more unbalanced situation in...

This program looks interesting, perhaps a bit similar in style to Ansoft Maxwell, which I've used a bit. I'll have to try how cable resistance changes in my case due to the proximity effect. Ok, I will have a look of that document, seems to contain relevant information for this case.

Currently, at the substation, the cabling is done with two single-core cables per phase. The distance between the cables is approximately 50 mm. The cable type is AHXCMK 1 x 800, i think it's XLPE insulated. The cables are mounted on a rack in an outdoor area with good ventilation, and the...

What I meant with my image in the previous message is that, in my opinion, a bundle of conductors of the same phase generates a larger magnetic field around the conductor bundle than an individual subconductor. This magnetic flux then passes through, for example, the loop formed by the L2 phase...

I work on a 20 kV substation project in which the existing parallel single core cables with a cross-sectional area of 800 mm² per phase should be doubled, meaning the rated current would increase from 2000 A to 4000 A. The existing cables are currently installed in a non-electromagnetically...

Hi If the length of parallel medium-voltage cable runs is approximately 20 meters, and cable sheath is grounded only at one end, does it matter how the parallel phases are installed on the cable rack? If the straightforward installation method doesn't follow the rule for arranging the phases on...

Ok i found the problem why i was getting so low values, problem was that i multiplied current with vacuum permeability for no reason when was calculating field intensity. Now I'm getting similar results what I get from previous heat energy calculations, if I adjust steel ring relative...

I made test with a bit lower 150 A current and recorded also cooling. If we ignore conductor heating effect and look only what plot says, then if i'm right steel ring heating power is about 0.5 W. I would like to verify how the maximum magnetic flux density is calculated in this case, because I...

I made this plot manually by collecting temperature points in every 30 s, i need to make some datalogger to record also cooling.

I'm not just looking for a answer, i want to know how iron losses can be calculated or estimated through calculations.

I created this plot by manually collecting temperature readings every 30 seconds. I need to make some kind of data logger to monitor the cooling process so that I don't have to watch it myself continuously.

Yes that is true, that steel ring is some unknown piece of water pipe. Is there some good book or source where i can find metallurgical values for some known material? If i understand it right estimated loss is regarding to this is about 0.6 W = 250A^2 * 1.031*10^-5 I tried to estimate the...

Ok, here is more information of my test setup.

Return path is outside of the ring. Theoretically yes, there will be always some losses regardless of the size of the ring, but I would assume that in practice, the heating effect on a 50 mm diameter loop and a 500 mm diameter loop would be different.