Hi,
Here On-Line-Tap-Changers are installed at 110 kv grid, however it can still be the cause of the voltage drop. Grid is something like this 400kv > 220kv > 110kv > 20kv > 400V.
Hi,
i don't have much more to work with.
Generator is connected straight to a substation (20kV >400V). I guess substation is about 1000kVA or more. I don't know what kinds of other loads are connected to same substation, but mostly motors i think. It's industrial site so there should be...
Hi,
1. Not much, i'm not currently at site myself. The drops at about 1/3 from left on the graphs are normal shutdown procedure. the problem starts at about center of the trends. Time interval of trends is 24h. Data is read via bus to the control system and i really don't know is it...
Hi,
No, generator is started as motor and then "switched" to generator by applying external moment to rotor. It's high a speed machine and the the generator nominal is frequency about 1700Hz, so for obvious reasons it cannot be driven without VFD.
Hi all,
Something weird is happening to this generator. It is driven by VFD that is connected via DC-bus to a another inverter that supplies the power to grid. At some point Voltage and current supplied to grid starts to oscillate. Does anyone have a idea what could be causing this behavior...
