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chhavinath dubey
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Join Date: Dec 2012
Posts: 2

Hermeticaly Sealed Transformer

12/05/2012 9:42 AM

can any one pls tell me

what is hermeticaly sealed transformer,how it works and what is the main purpose behind using this.
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Anonymous Poster #1
#1

Re: hermeticaly sealed transformer.

12/05/2012 9:53 AM

http://lmgtfy.com/?q=hermeticaly+sealed+transformer
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msamad
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#2

Re: Hermeticaly Sealed Transformer.

12/05/2012 11:19 AM

This is a copy from one of my previous posts (http://cr4.globalspec.com/thread/54809/Transformer, comment # 5) regarding the subject...

The hermetically sealed transformer is the transformer without the conservator tank. The pressure of the expansion/contraction of transformer oil (due to inside temperature increase and decrease) is absorbed by the conservator for a regular transformer. The hermetically sealed transformer is totally sealed and doesn't have conservator. This type of transformer required low maintenance and is used mostly in harsh operating conditions such as offshore petroleum facilities, chemical plant etc. Generally, there are two categories of hermetically sealed transformer based on the mechanism of absorbing the transformer inside pressure: (1) Corrugated transformer and (2) Nitrogen filled transformer

Corrugated transformer: The transformer is fully filled with transformer oil and its body is corrugated so that the body can expand and contract to absorb the change of inside oil pressure.

Gas (Nitrogen) filled transformer: A portion of transformer is filled with inert gas like nitrogen which can absorb the change of inside oil pressure with additional pressure/vacuum bleeders installed in the transformer.

- MS

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pwr2thepeople
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#8
In reply to #2

Re: Hermeticaly Sealed Transformer.

12/06/2012 1:57 PM

Mohammed,

I gave you a good answer for the clear and concise description, but I'm intrigued by your comment about a "regular transformer" having a conservator. I've been in the electric industry since 1976, and the vast majority of transformers I encounter are hermetically sealed, nitrogen filled units.

I note that most of my work has been in North America and the few conservator designs I've worked with were primarily in Europe, Asia and South America. I suspect that the "normal" design is a regional preference.

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lyn
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#9
In reply to #8

Re: Hermeticaly Sealed Transformer.

12/06/2012 2:10 PM

His answers are always good, clear and concise.
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lyn
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#3

Re: Hermeticaly Sealed Transformer.

12/05/2012 11:19 AM

It means there is a moisture barrier between the inside of the chamber and the outside.

It means that no water can enter the transformer.
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redfred
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#4

Re: Hermeticaly Sealed Transformer.

12/05/2012 2:36 PM

Usually you don't have to seal away a hermit. By definition they are solitary creatures that prefer to be left alone. This does make it difficult to detect when they transform since most people don't know them well enough to recognize the change.

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silverfox
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#5

Re: Hermeticaly Sealed Transformer.

12/06/2012 3:22 AM

As earlier posters have said the transformer is protected from moisture ingress. Upshot is under normal use they are far more reliable and will last in service for many more years than free breathing transformers. Usually around the 1MVA size.
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welderman
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#6

Re: Hermeticaly Sealed Transformer.

12/06/2012 8:39 AM

Whenever a component is hermetically sealed, it means that it is completely protected from the ingress of external fluids and gasses. This is usually done to protect it from the affects of contamination. For example, water vapor is a very small molecule that can diffuse as a gas through any organic barrier. After sufficient diffusion of vapor the dew point of the internal gas will be high enough that the internal water can condense as liquid or solid (ice) and create reliability concerns. This is why true hermetic seals are not organic but commonly ceramic, metal, or glass.
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lyn
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#7
In reply to #6

Re: Hermeticaly Sealed Transformer.

12/06/2012 10:01 AM

Well put.
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