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Old 03-08-2017, 04:43 PM   #1
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Default Lightning or surge damage?

Would anyone know if this was caused by an over voltage or by lightning? There were three contractors in one enclosure that all look like this. There was lightning the evening this happened but there was also over and under voltage events from the power company I believe.
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Old 03-08-2017, 05:35 PM   #2
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If you picked it up from across the room, and you put it together for the pictures, it was a direct lightning strike. The lightning could have hit the lines downstream causing a surge, which is what I think happened.

Whatizzit that we're looking at?
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Old 03-08-2017, 05:37 PM   #3
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*Contactors
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Old 03-08-2017, 07:27 PM   #4
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Looks more like under voltage to me.
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Old 03-08-2017, 08:43 PM   #5
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UMMMMM, Lightning is overvoltage.
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Old 03-08-2017, 08:51 PM   #6
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That coil looks burned from overcurrent ... ie, voltage dip.

Often happens after lightning takes a transformer out.
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Old 03-08-2017, 08:55 PM   #7
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Quote:
Originally Posted by sbrn33 View Post
Looks more like under voltage to me.
Yup a nice slow burn.
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Old 03-08-2017, 09:25 PM   #8
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It's one of 3 definite purpose contactor coils that burned up. The overload was also tripped on a control transformer separately.
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Old 03-08-2017, 10:14 PM   #9
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I've replaced several coils after lightning storms. It's not uncommon over here.
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Old 03-08-2017, 10:29 PM   #10
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More business for you.
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Old 03-09-2017, 01:10 AM   #11
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Under voltage could do that only if there is a load on it.

Over voltage is probably more likely. The sustainable voltage is a function of the insulation and spacing of the windings and will cause failure even with no load as the voltage escapes the insulation from one winding to another.

My best guess is over voltage = lightning.
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Old 03-09-2017, 01:35 PM   #12
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Dirty contactor might be the problem.
If a contactor doesn't fully pull in the magnetic circuit won't close and the coil will burn up.
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Old 03-09-2017, 05:36 PM   #13
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A Hotel Resort I do work at always had these problems ...when they had mainline power failures due to trees down across the lines ...24 to 30 lighting contractors burnt at a time ! I installed a $120.00 power conditioner for each of the controls voltage feed ....so sags or peaks were taken care of . Never had to replace a contractor in 4 years ....kinda shot myself in the foot !
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Old 03-09-2017, 10:20 PM   #14
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Quote:
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A Hotel Resort I do work at always had these problems ...when they had mainline power failures due to trees down across the lines ...24 to 30 lighting contractors burnt at a time ! I installed a $120.00 power conditioner for each of the controls voltage feed ....so sags or peaks were taken care of . Never had to replace a contractor in 4 years ....kinda shot myself in the foot !
We had the same problem with a customer was losing contactors left and right during storms we installed UV/OV, Phase Failure Relays. Not one problem since then
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Old 03-09-2017, 10:37 PM   #15
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So those relays turn off control power if activated correct?
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Old 03-09-2017, 10:40 PM   #16
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So those relays turn off control power if activated correct?
Correct with no time delay
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