Hi All,
I have a query about windfarm dynamic active and reactive response on a distribution network:
Is there any reason why a distribution system operator would not want a windfarm to
a) Recover its active power quickly following a voltage dip e.g. within about 0.5 - 1 second?
b) Provide...
Hi,
We have a windfarm that has recently energized. It currently has its breaker open, so the grid trafo 110/20kV is energized from the HV side only.
Both metering and SCADA are showing a few kW flowing from the trafo into the grid. It isn't constant, but doesn't look random or noisy either...
I have been reading some of the old threads about synchronizing generators, and the necessity to have the angle as small as possible (<20 degrees at least).
Do any similar standards apply to closing breakers on the rest of the transmission system, not necessarily near generators?
Kundur has a...
Hi,
I'm trying to determine zero-sequence data for a 3winding trafo 220kV/110kV/10kV Ynynd5 250MVA ABB transformer to put into PSSE.
In the transformer test sheets, under zero-sequence tests, there are 4 sets of numbers (Z, R, X):
HV with LV open -
HV with LV shorted
LV with HV shorted
LV...
Hi, I am looking at critical clearance times (CCTs) at a variety of different 220kV and 110kV buses for 3-phase and single-phase faults, using PSS/E. I've been looking at the different stability criteria people use. For instance, a previous study of this sort deemed that instability occurred...
Hi, I've been asked to look into why an R1Z23B electromechanical distance relay failed to react to a 3phase fault on a 110kV line, leading to a fairly big blackout in the affected county. The relay is 600/5 A, 60VA, and connected via a 25VA cable to a burden of 15VA. The fault had a...
