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Problem with strange trip 4

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Denan

Electrical
Jul 19, 2006
66
Hi all,

I have a problem with a CHP plant, strange gen.CB trips.

The situation is like this:

First I have to say that the gris in the area is very bad, unstable. there are two similar plants, one (our, with the problem) has one genset, and the other (neighbour) with two gensets. If we are on the grid (both plants are running on the grid only, no island mode etc.) and the neighbour starts his two engines our engine often trips. But if the neighbour is running first and we start after, everything is OK. And, also the trip does not happen every time, but most of the times. I attach some trendings (I am not there, but got it from my colleague), as well as AVR settings.
Hopefully someone has an idea of what could cause these problems.
As I mentioned, the grid is very unstable, and the voltage is usually little bit higher than nominal (Un=10,5kV)

Regards,
Denan
 
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Slava, var import had 2sec. delay originally.

Brg,
Denan
 
Hi Denan.

"Don't misunderstand me, I agree with you, changing the settings is not the best solution".
I know, settings change isn't your's :).

I think you must check Scotty's
"If there are stability issues such as loss of synchronism during a grid distrubance then the AVR tuning must be very bad" .

I also recommend install some portable disturbance recorder
on the 3xcurrent and 3xvoltage of generator and send recordered data to AVR mnf and to here too.

Best Regards.
Slava
 
We'll see what we can do. Probably AVR could be better tuned.

Thanks for the comments everyone [thumbsup2]
 
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