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Old 19th August 2006, 05:40 PM   #1
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Default Thunder and lightning

Why is it that these big caps heated up so much without the mains fuse acting first?
They are literally cooked...which takes time I presume.

/Hugo
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Old 19th August 2006, 05:45 PM   #2
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Odd things happen at extremely high voltages. Do you think the fuse blowing would stop a lightning bolt
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Old 19th August 2006, 06:43 PM   #3
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Hugo,

Was it really a lightning hit?
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Old 19th August 2006, 06:46 PM   #4
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That's true but I see a pattern.
The same guy's television has the blown fuse and a melted supply cap. Same scenario with his video player. Both are SMPS's.
Well, I bow for natures power.

/Hugo
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Old 19th August 2006, 06:48 PM   #5
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Poobah,

Yes, definitely. Almost all his gear is broken. Washing mashine, freezer, coffee machine, all electronics...name it.

/Hugo
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Old 19th August 2006, 06:58 PM   #6
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Boy... I hope he has some insurance!

I've done a lot of solar powered stuff... remote locations... solar panels are just like lightning rods. I think lightning just does whatever it damn well pleases. Fuses do nothing... when lightning melts the fuse, it has enough energy to ionize the metal vapor I think.

tough break -
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Old 19th August 2006, 07:04 PM   #7
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Yeah,

In our facilities we spend way too much money on lightning protection IMHO. Dem volts blow the protection AND the equipment. Wiked smart

Ya can't stop it
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Old 19th August 2006, 08:05 PM   #8
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I was just about to recommend him some lightning protection. We had good results in a set of buildings. Years ago, we had about 10 to 15 TV sets broken in one year from lightning strikes from that one block of buildings. Since the protection has been installed, we truly had none, zero.

/Hugo
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Old 19th August 2006, 08:27 PM   #9
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You have weaker lightning there

The fact that our equipment is grounded so well... several rods driven deep per facility..is certainly good for safety and good for me.

Sometimes though, as flawed as my thinking may be, I believe it's worse for the equipment during lightning. There is NO isolation between equipment and earth and every last volt casts it's wrath.

In most other situations The earth is likely weaker..a buffer? Am I crazy?
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Old 22nd August 2006, 05:39 AM   #10
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The lightening just needs an easier path to ground than through the stereo.
When I was repairing electric fence energisers I saw some rather spectacular lightening strike results - e.g. all copper gone from the pcb and plated over the inside of the casing! We used to supply diverter kits consisting of a big spring ( as a choke), a spark gap made of two fat bolts, and a 6 foot steel ground spike.
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