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Charles Kwarteng
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Join Date: May 2012
Posts: 1

Lightning Surges

05/20/2012 3:28 PM

Dear CR4's

lightning surges are causing our 100kva pmt transformers to burn,meanwhile surge arresters have been installed in this order , top -bottom (surge arrester,drop out fuse , transformer ) what could possibly be wrong ?
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SolarEagle
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Join Date: Mar 2007
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#1

Re: Lightning Surges

05/20/2012 3:56 PM

Your system lacks adequate protection and/or proper maintenance....when the fuse blows it takes the protection circuit out, leaving the transformer open to damage from additional surges...

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redfred
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#2

Re: Lightning Surges

05/20/2012 4:18 PM

Excuse me but what seems to be wrong is that you're not hiring a lightning protection specialist to come to your site to both inspect the damage and to do an analysis of the surge protectors you've used and how you used them. Often free advice from people who cannot see your facility is worth half of what you paid for the advice.

Lightning protection is not a simple task. Lightning is such a random, capricious, overwhelmingly powerful force of nature that people can do all the apparently right things and still end up with electrical damage. Similarly at another location somebody can apparently do everything wrong and never suffer from an adjacent strike. Contrary to many people's ideas, lightning protection from a direct strike can be achieved. If you have the need and money.

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wareagle
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Location: Alabama
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#3

Re: Lightning Surges

05/20/2012 6:34 PM

Please provide more information:

1 phase or 3 phase

primary voltage

Is this transformer on the end of a tap? If so how long is the tap?

Primary and secondary arresters?
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pnaban
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Join Date: Jun 2010
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#4

Re: Lightning Surges

05/21/2012 1:44 AM

Check insulation coordination

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thu062012
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Join Date: Jan 2012
Posts: 6
#5

Re: Lightning Surges

05/21/2012 3:52 AM

Hi,

Thanks very much for this comment. It help me to think about my ideals.

Tks again and pls keep posting.
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thu062012
Member

Join Date: Jan 2012
Posts: 6
#8
In reply to #5

Re: Lightning Surges

05/22/2012 4:41 AM

If you want to get more materials that related to this topic, you can visit:

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Best regards.
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bob62
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Join Date: Jan 2012
Posts: 3
#6

Re: Lightning Surges

05/21/2012 11:14 AM

Charles need to supply more information as requested in post #3.
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jack of all trades
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#7

Re: Lightning Surges

05/21/2012 2:57 PM

What voltage is the transformer, and have you selected the correct surge arrester for the application (ie- is the protection too course - let through voltage too high, or too fine - keeps blowing the fuses protecting the surge arrester).

Without much more information all we can do is guess. Also have a look to see if the damage is caused on the secondary side of the transformer, you may be protecting the wrong end.

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wareagle
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#9

Re: Lightning Surges

05/23/2012 11:45 AM

Charles if you want to solve your problem, fill in the missing information.
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bob62 (1); jack of all trades (1); pnaban (1); redfred (1); SolarEagle (1); thu062012 (2); wareagle (2)

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