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Join Date: Mar 2014
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Electrical Power Cable Panel Base Plate Heat Up

09/03/2016 4:46 AM

Dear
we newly connected power panel for 400v 1000A, the wire used for incoming is 630MM2 x3 xlpe non armed.

in the base plate distance between 3 phase is around 200 m , base plate is GI,actual load current is around 378A ( balance all phase )

the base plate is heating up with +5to9 Deg with humming sound, please some one explain the problem.

we are sure that its not ground and ground is effective.

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#1

Re: Electrical power cable panel base plate heat up

09/03/2016 10:25 AM

The problem is that your base plate is heating up and humming around 200 m away.

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#2

Re: Electrical Power Cable Panel Base Plate Heat Up

09/03/2016 10:49 AM

Are there any conductors of different phases passing through separate holes in the plate?

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#3

Re: Electrical Power Cable Panel Base Plate Heat Up

09/03/2016 2:23 PM

"in the base plate distance between 3 phase is around 200 m" Hum, just so this old U.S. country boy understood your 200 m distance in terms of U.S. customary measurements, that comes out to over 656 feet between each leg! As you stated "we newly connected power panel ..." Are you sure your talking about a 'panel' an not a 'warehouse'!

Working in and around various power plants, I never seen relay-rooms that Big.

As far as the humming noise, you might recheck the lug torques on the bus bars

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#4

Re: Electrical Power Cable Panel Base Plate Heat Up

09/03/2016 2:47 PM

It's humming because it doesn't know the words. The old ones are the best.

Google "eddy currents". You might learn something.

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#5
In reply to #4

Re: Electrical Power Cable Panel Base Plate Heat Up

09/03/2016 6:05 PM

I going to mention "eddy currents" but didn't bother, 200 m apart ....., the subject matter maybe to far apart them to grasp

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#6

Re: Electrical Power Cable Panel Base Plate Heat Up

09/03/2016 11:27 PM

This may be due to Eddy current circulation,please provide Aluminium gland plate as against GI Plate.

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#7

Re: Electrical Power Cable Panel Base Plate Heat Up

09/04/2016 12:27 AM

I assume you meant 200mm not 200m, so it's almost certainly due to eddy current circulation between the conductors which is caused by induced magnetism in the ferrous gland plate.

Interestingly, the farther apart the single conductors, the greater the eddy current problem.

Solutions are to either fit a non ferrous gland plate or to cut slots between the cable holes in the existing plate, or to put all cables through the same hole.

Either method will solve your problem, but the slots may weaken the plate and, as is also the case with the third option, may reduce its moisture sealing integrity and could invalidate internal arc suppression requirements, .

Whilst there will still be induced currents in the non ferrous material, it will not cause heating due to the lower hysteresis, but be aware of possible galvanic action between the gland plate and the glands if of differing metals.

Complex harmonics produced by VFDs etc also tend to increase the incidence of eddy current problems in gland plates.

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#8

Re: Electrical Power Cable Panel Base Plate Heat Up

09/04/2016 4:57 AM

This the way I’ve always made transformer gland plates. It is important that the glands and locknuts are nonferrous.

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#9

Re: Electrical Power Cable Panel Base Plate Heat Up

09/05/2016 1:43 PM

please clarify your original post as to dimensions, but clearly, the problem is easily solved by the answers already present here. Remove the ferrous metal separation at the gland.

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#10
In reply to #9

Re: Electrical Power Cable Panel Base Plate Heat Up

09/05/2016 2:58 PM

I find this a bit scary, "they" have enough knowledge to install a 1000 amp "panel" but not sure of the distance between each leg or why the hot humming is coming from the newly install from panel.

My thought is, "they" are the bind leading the bind and "they" should stop where "they" are at and hire a confident electrician to correct the problems before "they" burn the place down or kill someone

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#11
In reply to #10

Re: Electrical Power Cable Panel Base Plate Heat Up

09/05/2016 5:19 PM

Certainly after the death toll rises, they will replace staff with competent.

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#12
In reply to #11

Re: Electrical Power Cable Panel Base Plate Heat Up

09/05/2016 6:18 PM

They'll probably have no choice but too! And after reading his/her first post, it's self explanatory. To much info leads to .... Gotta love Darwin's Theory, huh?

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#13
In reply to #12

Re: Electrical Power Cable Panel Base Plate Heat Up

09/06/2016 9:47 AM

I hear the next recipients of that Award are dying to get it!

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