LIOA voltage regulators

[carlyai]

I think there could be a possible hazard with these regulators.
 
I have 3 SH10000 AVR' s on my incoming 3 phase. The incoming 3 phase come overhead to an outside CU main breaker, through lightning protection breakers and split feed to the house 3 stabilizers.
Because of storms in the area, we lost one phase on Tuesday and Wednesday, and I think when they tried to put it back on load, they stuffed something up. My wife called me to say the stabilised on the 2 phase was making a loud noise, and when I got to it, there was a big brown smell in the air and the stabilised case was nearly too hot to touch.
 
Check of the village and housholds had lost their tv's and electronics, so all I can guess is that the voltage on phase 2 went very high.
I know the stabilised has output load protection, but it doesn't seem to have input protection.
If we weren't at home, and quickly turned off the stabilised maybe it could have started a fire in the house?
 
 
 
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[Crossy]

Sounds like they managed to swap N and one phase, or left the neutral disconnected. Either can lead to a significant over-voltage situation.

 

May be smart to add over-volt protection to the front end of the AVRs.

 

The poor beast was evidently trying to regulate down, it probably saved your expensive kit.

[carlyai]

Thanks Crossy, was going to ask about under/ over voltage protector.
Can you just get over voltage protection units?
Not game, as yet to turn on the stabilised, maybe turn off all downstream and sneak it on, or pop the case and have a look. When I touched the case top it was too hot to leave the hand there.
Maybe have a look?

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[Crossy]

If you're sure the incoming supply is OK now, turn it on with nothing downstream.

 

I've not seen over-volt only units, our adjustable one has a minimum under-volt limit of 165V which is fine for us with no AVR but you may want to continue regulating below that.

[carlyai]

Thanks again. Sup said house across the road all the lights broken as well as other house tv blown up. I would say PEA had a small farque at their office this morning.

 

I've got under/over protection on my pumps, but never thought about the AVR' s.

 

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[kamalabob2]

The LIOA extension cords I looked at were 2nd only to a certain house brand of Thai Watsadu in spec and build quality. Vietnam standards for electric cables might not be up to Thailand standards. The OP comment and concern with the LIOA device does not shock me. 

[carlyai]

Scared me...if we weren't here...?

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[Crossy]

Like all transformers these things are pretty robust. Was there any actual smoke?

 

Pop the lid and check the transformer brush moves freely and fire it up. Chances are it will be just fine.

 

Then go and find some over-volt trip units.

 

[carlyai]

I couldn't see any actual smoke, I don't think, as I was running around, not panicing mind you. At the same time phase 1 was having some problems, then all 3 phases shut down incoming. I was looking initially for a house problem.
I'll pop the top tomorrow as more excitement at the moment will cause me to take a sip of the devil's liquid.
Thanks and keep dry.

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[Crossy]

This unit appears to allow you to disable under (or over) voltage detection.

 

https://www.aliexpress.com/item/80A-220V-adjustable-automatic-reconnect-over-voltage-and-under-voltage-protection-device-relay-with-Voltmeter-voltage/32816187651.html

 

Or this one http://www.gencontrol.co.uk/65v...260v-range-ac-dc-protective-relay.html will need external contactors.

 

[carlyai]

Took the cover off, had a good look and compared it to the other one. Turned on with progressive load and OK.
Will order a protection device you suggested.
Will have a look at the specs. again and probably order 1 unit, and pigtail the connections to it.
Looking back (hindsight?), and now I remember a bit more about what I'm doing, I'm wondering why I used the 50 m2 cable?


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[Crossy]

Looks like it survived well

 

You'll need one protection device per phase of course.

[carlyai]

Stupidity should be punished.

Off course. [emoji26]

I was thinking of the pumps where I put 1 protector for each pump on the same phase, where I think I could have used 1 protector.

This time I was going to be smarter without thinking.

Would I have woken up before the order?

Thanks Crossy.

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