rise up in the grid voltage cause of cos phi inductive
rise up in the grid voltage cause of cos phi inductive
(OP)
spanish regulations, make me produce inductive power (over excited generator) when the grid is weak, and I got a low voltage group 1350 kw, and i start to control power factor, changing depending on the hour to satisfy the requirements of the grid ( in order to get more money from them)...and the grid voltage rise up from 400 to 430 or 435 v (the base voltage is 400) and the protection of overvoltage trips cause is adjusted on 105 % that means it trips when the voltage rises to 120 V... my question is:
could i rise the overvoltaje adjustement...in example to 10 %? cause i was thinking on modify the taps of the step on transformer but if i do it... i´ll got the same problem with the capacitive side (that voltage will drop) .... please any help will be great..... thanks a lot
could i rise the overvoltaje adjustement...in example to 10 %? cause i was thinking on modify the taps of the step on transformer but if i do it... i´ll got the same problem with the capacitive side (that voltage will drop) .... please any help will be great..... thanks a lot






RE: rise up in the grid voltage cause of cos phi inductive
I am a little bite confused about 400V and 120V which voltage level are you using?
PF control may trigger the voltage flucutation problems depends on the system voltage.
THat is why most of the system generators control terminal voltage instead of PF control.
RE: rise up in the grid voltage cause of cos phi inductive
what i see about modify step up transformer is that the problem will move to the low voltage protection, cause the volts will go down when i´ll be on capacitive...
what do you think about changing the maximun voltage protection from 105 to 110 %??
RE: rise up in the grid voltage cause of cos phi inductive
RE: rise up in the grid voltage cause of cos phi inductive
In a weak system, I assume your system is pretty weak and the POI fault level/generation capacity is less than 10. If that is the case, LTC won't buy you much.
Since I am not familiar with your system. if it is weak better use voltage control instead of PF control. Q & V you can only control one of them. in your case, better V.
I am not sure which type of O/V protection you are talking about. If it is your generator O/V protection, you may want to contact Manu.. If not, then probably you can modify from 105% to 110% I don't see any problems.
again, I am not a P&C guy but a system guy. Can't offer you further helps . Sorry!
RE: rise up in the grid voltage cause of cos phi inductive
RE: rise up in the grid voltage cause of cos phi inductive
Is your set connected to a 400V distribution system, in a factory say, then to the grid therough a 400 / 10kV transformer? If so, then you are in danger of putting all the factory equipment overvoltage.