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Old 06-04-2016, 11:22 AM   #1
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Default Lightning strikes

Local ski/golf course completely relies on a thirty horse well pump for watering and snow making. The problem is lightning keeps hitting well casing. They recently put a vfd on motor and the first storm that came through took it out. It needs suppression on both sides of the drive. Any ideas? I was thinking of tvss before it and lightning arresters on load side. Any ideas?
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Old 06-04-2016, 11:30 AM   #2
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Man lightning loves well cases because they are just such damn good grounds. TVSS and arrestors might help but a direct strike is hard to handle. You may have to make something else into a target. Two or three antenna towers around the well, grounded running away from the well and tied together may be a more long term fix.
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Old 06-04-2016, 11:38 AM   #3
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I recommended them call a lightning specialist like sleeping bear.we have sub contracted them for other installs. Customer says even when nearby tree gets hit, it gets redirected to casing at ground level as it is down 400'. Not sure a halo would even work. 200' pines nearby.
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Old 06-04-2016, 11:41 AM   #4
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I recommended them call a lightning specialist like sleeping bear.we have sub contracted them for other installs.
Agreed, let a guy look at it that does this stuff all the time.
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Old 06-04-2016, 11:54 AM   #5
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Yeah, whoever did the original install did a crummy job. Used three wire Urd. No ground wire on a y system, and just bonded the disconnect and vfd enclosure to the casing. Run is 800 feet roughly. Not good
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Old 06-04-2016, 11:57 AM   #6
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Yeah, whoever did the original install did a crummy job. Used three wire Urd. No ground wire on a y system, and just bonded the disconnect and vfd enclosure to the casing. Run is 800 feet roughly. Not good
I'd bet that was done by the lowest bidder, you get what you pay for at times.
Now paying to get it right will cost them more than the right way the first time around.
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Old 06-04-2016, 12:20 PM   #7
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I'd bet that was done by the lowest bidder, you get what you pay for at times.
Now paying to get it right will cost them more than the right way the first time around.
This resort is under newer ownership. I feel bad that they didn't know what they were getting into. Manager said that this is the first resort he seen rely solely on a well. The ponds that the well fills is unlined as well. Leaches 100 gpm into the ground. They don't give bentonite away either. Corners were cut everywhere you look.
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Old 06-04-2016, 12:36 PM   #8
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Seems a bad place to put a drive in. Couldn't they mechanically change motor output speed? Is the motor taking the hit as well?
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Old 06-04-2016, 12:46 PM   #9
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The start up on the submersible pump is really hard on it. Not so much trying to vary the speed. Just ramp it up more or less. Pump is 230' down. Filling ponds needs no regulation. Snow guns run pump nonstop in winter.
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