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Anonymous Poster #1

Post Insulators

03/15/2014 9:20 AM

Hi,

Are post insulators only used upto 33 kV level? Are post insulaors only used to support three phase conductors in three posts? Does it have anything to do with insulation levels - (eg. a surge arrester should have lower insulation levels than the transformer.) What will happen if post insulators are not used?

Regs
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ozzb
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#1

Re: Post Insulators

03/15/2014 9:41 AM

Are post insulaors only used to support three phase conductors in three posts?

No they are used in the farm and cattle industry for electric fence insulators.

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sauravbabu
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#2
In reply to #1

Re: Post Insulators

03/15/2014 10:04 AM

i think they can be used upto 1200 kV ac and 800 kV dc voltage levels.

sks
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lyn
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#3

Re: Post Insulators

03/15/2014 11:29 AM

Posts are not normally associated with electrical power transmission lines.

Post - Wikipedia, the free encyclopedia


Post insulators are completely ineffective in protecting CR4 from inane anonymous posts asking questions more readily answered by an internet search.


Insulator (electricity) - Wikipedia, the free encyclopedia

More images for power transmission line insulators
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Tornado
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#4
In reply to #3

Re: Post Insulators

03/15/2014 1:38 PM

At the 26.3 kilopost level, one needs strong insulation.

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lyn
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#5
In reply to #4

Re: Post Insulators

03/15/2014 1:47 PM

But alas, none exists at that level of exposure.
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Mik.ka
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#6
In reply to #5

Re: Post Insulators

03/16/2014 1:58 AM

In accordance with the standards IEC, ANSI, CSA and other certifications single-component series up to a length of 90 inches and voltage levels up to 1100 kV.

http://www.lappinsulators.com/produkte/porzellanisolatoren/stuetzisolatoren/?L=2
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IdeaSmith
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#7
In reply to #5

Re: Post Insulators

03/16/2014 7:02 AM

That must be "exposture" you mean!

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PWSlack
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#11
In reply to #4

Re: Post Insulators

03/17/2014 10:02 AM

Is that an euphemism for the expression "thick skin"?

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jhhassociates
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#8

Re: Post Insulators

03/16/2014 7:37 AM

Van de Graaff generators producing several BEV sit atop post insulators. In theory there is no electrical limit. In practice the structural integrity and manufacturing methods for porcelain and glass would impose an upper limit.
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#10
In reply to #8

Re: Post Insulators

03/16/2014 7:59 PM

"...BEV..."

.

?

'BeV' as in billion electron volts? I'd say GeV if I wanted to express 109 eV. Tomato/Potato. But eV are not a measure of voltage, but energy and several GeV is a very tiny fraction or a joule....so I'm thinking your original 'BEV' probably has some other meaning.

.

.

Also, just to play devil's advocate, there are some theoretical limitsI can think of....

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welderman
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#9

Re: Post Insulators

03/16/2014 9:22 AM

The use of post insulators is sometimes limited by climatic conditions. In wet or damp weather, they can cause a lot of arcing.
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IdeaSmith (1); jhhassociates (1); lyn (2); Mik.ka (1); ozzb (1); PWSlack (1); sauravbabu (1); Tornado (1); truth is not a compromise (1); welderman (1)

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