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ELEC- TANSFORMER VIBRATION

09/04/2008 4:26 AM

our power transformer and its foudation has much vibration due to operating a large compressor.what are the effect of external vibration on transformer. is it any document or standard in this field?

spec. of TR: oil- immersed-25MVA- 33/6KV

thanks,

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#1

Re: ELEC- TANSFORMER VIBRATION

09/04/2008 6:07 AM

Hello bipc54

It is always recommended that transformers be isolated from vibration which is emitted by other equipment.

The compressor will be much lighter in weight/mass than your above transformer.

Thus if there is only the single concrete slab on which the transformer and compressor are mounted, it would be prudent to use vibration damping mounts for the compressor.

Long term vibration of a power transformer which is outside the designed vibration frequency range (normally the mains frequency and a few cycles either side of the nominal mains frequency), may have long-term effects such as cracking of bushings, cracking of windings insulation, cracking of winding support structures, fractures in conductors in the transformer windings and elsewhere, and more.

Normally by the time external vibration has caused the damage inside the transformer, the failure becomes very sudden, with no obvious warning, and may be catastrophic.

I urge you to quickly obtain vibration damping mounts for the compressor and any associated equipment, if you are unable to locate it off-slab.

Kind Regards....

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#2
In reply to #1

Re: ELEC- TANSFORMER VIBRATION

09/05/2008 9:45 AM

Definitely agree. If the compressor or transformer cannot be mounted on separate foundations, get the best vibration isolation possible for the compressor. Contact a vendor such as Mason Industries for recommendations to isolate that compressor, and install the pads, pipe vibration connectors, etc. that is recommended.

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#3
In reply to #2

Re: ELEC- TANSFORMER VIBRATION

09/06/2008 12:04 AM

Hello,

But I don't understand from where the compressor has come which is mounted near a Transformer.

Basically the transformer plinth shall be free from any vibartion equipment in the vicinty.

The inherent vibration will be there which is due to eddy current in the transformer windings. The foundation is designed to withstand this.

Regards,

N.Suresh

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#4
In reply to #3

Re: ELEC- TANSFORMER VIBRATION

09/06/2008 1:41 AM

Dear sir

thanks for your idea.thier foundation are seperate. the distance between transformer & compressor is 150 m.

but this vibration is due to operation pressure of compressor 2750 bar.

The trans. has no internal vibration.

best wishes,

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#5
In reply to #4

Re: ELEC- TANSFORMER VIBRATION

09/06/2008 1:54 AM

Hello bipc54

What is the weight of the compressor?

What is the ground/soil type?

You may need vibration damper mounts, and along with supporting the compressor on a very large buried block of concrete, to dampen down the vibrations.

A site drawing or digital photo would assist.

Kind Regards....

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#6
In reply to #4

Re: ELEC- TANSFORMER VIBRATION

09/06/2008 10:00 AM

What is the ratio of the weight of the compressor and the weight of its foundation? I believe the compressor foundation should have 1.5 times the weight of the compressor. If this is not the case, Sparkstation is correct, supplemental vibration mounts are required.

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