Thumb Rules Flashcards
1% change in Frequency leads to how much change in MW Load?
2%
What % load should be shed to raise Frequency 1 Hz?
6-10% (8% mid-point)
What is the time error of +/- .02 Hz for 1 hour?
1.2 Seconds
During restoration conditions, you should consider doing what to your Normal Regulating Reserve?
Doubling it
During Restoration conditions, what should you limit Load Restoration Blocks to?
No more than 5% of current synchronized generation
Loss of metering on BA’s exporting tie line causes ACE to go in what direction?
Negative (thinks BA has reduced generation)
Loss of metering on BA’s importing time line drives ACE in what direction?
Positive (thinks BA reduced load)
NERC preferred governor band is what?
5% - +/- .036 Hz
UFLS programs typically start load shedding with what frequency range?
59.5 Hz to 59.3 Hz
Steam Turbine UF tripping is typically set for Instantaneous in what Frequency range?
58 - 57 Hz
5% change in Voltage typically leads to what % change MW Load?
3% (7% Motor Loads)
What is typical transmission line MVAr production for 230kV line?
1/3 MVAr/mile
What is the typical transmission line MVAr production for 345kV?
3/4 MVAr / Mile
What is the transmission line MVAr production for 500kV?
2 MVAr/mile
What is the typical transmission line MVAr production for 756kV?
5 MVAr /mile
