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uhammad Atif Irshad
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Join Date: Aug 2016
Posts: 14

Bus Tie Duct Noise

08/22/2016 6:41 AM

Dear Sir,

We have installed BTD for 5000A,bus bar 120X10X4 for each phase, when load cross 2400A , than there is lot of noise , can you explain how we can decrease noise, and tell how minimum clearance need between phase to phase bus bar and phase to earth bus bar
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redfred
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#1

Re: Bus Tie Duct Noise

08/22/2016 8:04 AM

I would start with safely measuring and recording the acoustic (?) noise in both amplitude and frequency. This should do two things for you. It will give you a baseline to compare your later attempts to reduce this noise and you will now have information that one can analyze.

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PWSlack
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#2

Re: Bus Tie Duct Noise

08/22/2016 8:21 AM

It comes as a surprise to learn that the installation is claimed to be complete, and that the assessment of minimum clearance necessary for correct installation has not been completed! The organisation's procedures would warrant a careful reassessment in that case.

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RAMConsult
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#3

Re: Bus Tie Duct Noise

08/22/2016 10:02 AM

The magnetic forces increase as the square of the current; i.e., the forces at 4,800 Amps is four times greater than at 2,400Amps. Any loose or improperly torqued connectors, insulators, fasteners, supports, panels, covers, etc. will be effected by these forces. Your only solution is to do a complete inspection and retorqueing of every connection and fastener in the entire bus duct assembly, and (Darwin Award spoiler) don't forget to deenergize the equipment.

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lyn
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#4

Re: Bus Tie Duct Noise

08/22/2016 3:23 PM

Define "noise".

Can you give the amplitude and frequency of the noise?
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TonyS
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#5

Re: Bus Tie Duct Noise

08/23/2016 4:21 AM

Copper or aluminium bars, the separation, the support/bracing spacing, nothing other than the bars would appear to be undersized.

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HiTekRedNek
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#6

Re: Bus Tie Duct Noise

08/23/2016 7:16 AM

Is the loud noise a "HUM"?

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Circuit Breaker
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#7
In reply to #6

Re: Bus Tie Duct Noise

08/23/2016 9:54 AM

Why do the bus bars hum - because they don't know the words? JHF

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HiTekRedNek
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#8
In reply to #7

Re: Bus Tie Duct Noise

08/23/2016 10:21 AM

DANG IT! Steal a man's thunder will ya?!

That was gonna be my reply if he answered yes!

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Circuit Breaker
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#10
In reply to #8

Re: Bus Tie Duct Noise

08/23/2016 12:06 PM

Never ceases to amaze me the questions posted about projects in the multi mega watt and multi mega $ range and it seems the poster has no comprehension of what will, can or may happen. I had to take my shoes and socks off and still couldn't count the power (s)he is talking about - even at fairly low voltage. I have never worked with that kind of power and so I can't imagine how loud the "bang" will be. Even the Mythbusters should be impressed. And that's not even thinking about the death and destruction that is sure to follow. -- JHF

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lyn
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#11
In reply to #10

Re: Bus Tie Duct Noise

08/23/2016 1:28 PM

It helps to thin the gene pool.
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lyn
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#9
In reply to #7

Re: Bus Tie Duct Noise

08/23/2016 10:58 AM

Hum a few bars and maybe I'll pick it up.
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rwilliams
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#12

Re: Bus Tie Duct Noise

08/23/2016 2:08 PM

The voltage of the installation will determine some of the clearance requirements, and the BIL of the other attached equipment will also determine clearance, to coordinate the insulation. Also, what is the insulation system, and whether the system is solidly or effectively grounded could also be a factor.

Heat dissipation may also be a factor in the conductor spacing, if you plan to alter the original design and clearances of the original equipment.
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Circuit Breaker (2); HiTekRedNek (2); lyn (3); PWSlack (1); RAMConsult (1); redfred (1); rwilliams (1); TonyS (1)

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