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Feed Back problem

Engr naeem

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This is somewhat outside of my area of expertise, perhaps beyond many here on this forum. In this country, we generally have one huge 3-phase transformer feeding several houses, and it sits in a box down the street and you don't even know where it is. There is no chance of hearing anything. But I know in some areas of the world you might even have your own transformer, sitting up on a pole or what have you. Now there are certain rules as to how much you can feed in reverse, and we'll need a LOT more information and a good electrician to answer any of this. Sorry about that :-)

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4 hours ago, Engr naeem said:

yes, transformer is outside on pole & single  own transformer. When power export more than 1000watt from 10kW 3 phase Infini, produces sound in transformer & flickering of load in home.......

Connecting to the grid is an issue.

Here in CoCT, and more and more other municipalities in SA, it is either against the law (where you buy direct from Eskom), and stringent connection rules and regulations, where you buy from municipalities, and want to grid tie.

Disconnect the inverter, get professional advice is my suggestion.

Maybe, and I am guessing, you can probably cause damage to transformer and / or cause other households to start losing their electrical appliances, where they connect to same transformer / localized grid the transformer ties into.

This is what it COULD look like: 



See no 4, is that the sound you hear? :-) 


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2 hours ago, Johandup said:

The power stations are really too big to take them on with your 10kw rig

I know ... there is reason for my post. :)

FWIW. Friend of mine, and a few neighbors he knew, kept on losing electrical appliances over a period of time during the power failures. When the power is supposed to be off, his lights where dimming. UPS'es went ballistic, that clicking sound you hear, as they try and sort the incoming current. So bad even his UPS'es failed eventually.

In the end it turned out nearby wind turbines where still feeding +-100v, erratically, back into the local grid, instead of being isolated, if there was wind.

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Too little information here, but I was thinking that if perhaps you have a dedicated transformer feeding your house -- that sort of thing happens, it is common on farms too -- it really depends on the rating of that transformer. Transformers are usually designed to convert power in one way (step down in this case) and though they do work in reverse, they cannot do the same sort of power levels. Also, if you google around a bit, there is a lot of talk about how such utility transformers include compensation, and there is also the matter of power factor, if your inverter doesn't properly compensate for that it can significantly increase the reactive power component, something which causes things to heat up.

I can easily see that putting a 10kva inverter onto a transformer that is for argument's sake also a 10kva unit would be a bad idea. That's just a simple gut feeling. Now since we know next to nothing about this, it is far better to involve someone who does understand these things.

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