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weijunmei
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Engineering Fields - Power Engineering - New Member

Join Date: Dec 2013
Posts: 48
Good Answers: 1

Painting Shields and Conductors

12/17/2014 9:42 PM

Dear Sir:

In SF6 GIS, some shields and conductors are all painted, why? For insulation reason?

the principle of improving the insulation performance?

thank you all

Weijunmei
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PeterT
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#2

Re: Painting Shields and Conductors

12/18/2014 8:20 AM

The manufacturer should be able to tell you why they do it. Why not ask them?

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SHOCKHISCAN
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#3

Re: Painting Shields and Conductors

12/18/2014 9:26 AM

It depends on where the paint is applied.

In some applications semi-conductive paint is applied to reduce corona affect and in other applications the coating protects the component from ozone damage and/or to improve the insulation rating.

Contact with the associated breaker manufacturer technical support department should provide specific answers to your questions.

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obouill
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#4

Re: Painting Shields and Conductors

12/19/2014 4:30 AM

As rightly said by Shockshiscan , painting allows to reduce distances as the dielectric constant of epoxy paint is different from the gas itself, this allows to minimize the electromagnetic field on the conductor, where the discharge may start.
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7anoter4
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#5

Re: Painting Shields and Conductors

01/02/2015 12:10 AM

See [also]:

http://www.google.com/patents/US3767840

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7anoter4
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#6

Re: Painting Shields and Conductors

01/02/2015 3:10 PM

In my opinion, the conductive painting -on the inner part of the insulated corona shield-is connected with the conductor-at high voltage potential. Doing so no electrical field will be between the conductor and the corona shield mainly in the connection area where the electrical field usually it would be higher due to presence of many edges. High electric field in the air gap between conductor and the corona shield would produce electric arc which could damage the corona shield insulation.

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weijunmei
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Join Date: Dec 2013
Posts: 48
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#7
In reply to #6

Re: Painting Shields and Conductors

01/03/2015 10:40 PM

thank you ,sir,in this patents,the,shield is made from expoxy, a little diffrent from what i want to say. how can i send a photo in this?
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Users who posted comments:

7anoter4 (2); lyn (1); obouill (1); PeterT (1); SHOCKHISCAN (1); weijunmei (1)

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