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14 comments
Participant

Join Date: Oct 2012
Posts: 2

220kv/33kv Substation

10/06/2012 3:15 AM

dear sir,

we have 155mts x 78mts .In this regard we are planning to install lightning mast at a height of 26.5 mtr. Please confirm how many numbers of lightning masts required for it

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Guru
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#1

Re: 220kv/33kv substation

10/06/2012 9:07 AM

OK, give us a number and someone will confirm it.

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Guru
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#2

Re: 220kv/33kv substation

10/06/2012 11:44 AM
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Active Contributor

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#3

Re: 220kv/33kv Substation

10/06/2012 1:27 PM

Do you mean the dimensions of the Substation is 155m x 78m? You need only ONE lightning mast to be installed in your substation.The only condition is that the LIGHTNING CONDUCTOR should be HIGHER THAN THE HIGHEST STRUCTURE in the substation.

Regards

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Power-User

Join Date: Jun 2007
Location: chennai,India
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#4

Re: 220kv/33kv Substation

10/06/2012 2:10 PM

Since you are from India Please consult Vendors of Lighting equipment suppliers like Crompton, bajaj,with given input they will give you complete design of no of lighting points, power requirement,intensity of light ,location of Light mast etc.

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#14
In reply to #4

Re: 220kv/33kv Substation

10/08/2012 1:50 AM

I think OP's query is about 'lightning' and not ' lighting' !

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Guru

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#5

Re: 220kv/33kv Substation

10/06/2012 10:53 PM

Why did you decide the height as 26.5m,what is the logic behind it. For lightning protection you can fix 4 masts at 4 corners of the substation and connect them at top diagonally and peripherally and earth at each mast. If it is for illumination fix lights along the periphery. Quantity,type,height and wattage of lamps depends on recommended illumination levels for a substation.

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#6

Re: 220kv/33kv Substation

10/06/2012 11:41 PM

Did you talk about lightning as to put lamps on it , or to drive lightning stroke from electrical storm??

You shall be clear on your questions

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#7

Re: 220kv/33kv Substation

10/06/2012 11:59 PM

Sorry I made a mistake in understanding I withdraw my comments

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#8
In reply to #7

Re: 220kv/33kv Substation

10/07/2012 12:08 AM

Ramvinod, it was not your mistake , you did an understanding from a POOR question.

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Guru

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#10
In reply to #8

Re: 220kv/33kv Substation

10/07/2012 2:04 AM

I don't understand why the OP not clarifying our doubts.

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Commentator

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#12
In reply to #10

Re: 220kv/33kv Substation

10/07/2012 5:03 AM

and I don't understand why you are worrying about someone who can't or won't do the work themselves, but expect us to do it for them!!

Who cares what is problems are.. if he's clever enough to find CR4 then I'm sure the is clever enough to find ALL the answers to his problems!

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Commentator

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#9

Re: 220kv/33kv Substation

10/07/2012 1:38 AM

you managed to find CR4.. so manage to find the answer to your question.

We are not going to do your work for you!

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#11

Re: 220kv/33kv Substation

10/07/2012 4:42 AM

Two mast of 26.5 meters high for 33 kV S/S (from 2.5 m up to 3.5 m of bay width and/or only one for 33 kV indoor station)

One mast by 220 kV bay (say 2 for 2 bays, at each extreme side).

This is the minimum protection. 1 mast/bay is not enough to protect all bay long. You need plus a guard cable on each side of the bay. Let's say a 277 sqmm steel/alu cable, firmly connected to s/s earthing system.On each side of the bay, and relied to the last line tower, at least by two cables.

With one mast and 2 guard cables, you should ensure a protection up to 65 Isokeraunic level. Guard cables are more efficient than masts ( once lightning has touch the lightning arrester, it is out, and you have no more protection except if you have some Faraday lightning arrester which are only simple antennas, but less efficient than nuclear lightning arresters) But guard cables continue to protect the bay.

Lightning protection is a science. You should read some books about it (little friend advice)

Good luck, BRZK

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Guru

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#13

Re: 220kv/33kv Substation

10/07/2012 9:20 AM

Please see if this helps:

http://www.crazyengineers.com/community/threads/lightening-protection-earthing-for-a-mountain-top-home.48633/#post-188554

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Users who posted comments:

bioramani (1); brzk (1); debata07 (1); devitg (2); lyn (1); Olu Gyibrilla (1); pnaban (2); ramvinod (2); thccontrols (2); wareagle (1)

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