May Study Session Flashcards
You have lost telemetry for one AGC tie-line. What should you do?
Replace the tie-line value with a manuel value.
Only use flat tie line when you’ve lost your frequency source.
When are you not DCS complaint?
When you don’t have enough contingency reserves available within your BA.
What is the impact of State Estimator not being available?
Possible thermal over-load of an unmonitored line
To be effective, reactive resources should be:
Distributed throughout the system
Remember the concept of VARs is that they don’t “travel far” so you want the reactive resources as close to your load pockets as possible which would generally be distributed throughout your system.
Two lines of same construction and voltage exist. Line A is 100 miles long and line B is 10 miles long. Line A produces more VARS than line B. Why?
Longer line will produce more MVAR as it’s a MVAR per mile calculation.
What is SIL?
Surge Impedance Loading
If a line is loaded below its SIL, it will act like a _____________.
Capacitor
If a line is loaded above its SIL, it will act like a _____________.
Reactor
Voltage stabilizer analysis measure
P-V Curve
They compare power flow into a given area of your system to the voltage support capability before voltage collapse occurs. You’ll sometimes hear the collapse point referred to as the “knee of the curve”.
Phase shifting transformers:
Control megawatt power flow
If it’s connecting in series I’m controlling:
Power flow
It’s in connected in shunt, it’s controlling:
Voltage
What do we need when we have low voltage?
Capacitors
What do we need when we have high voltage?
Reactors (Or remove capacitors from service)
A United with a 5% droop would be expected to run the full range of its capacity for what frequency band?
58.50 to 61.50Hz
3 Hz for 5% droop but it’s split at 60 Hz so it would be 1.5 Hz in each direction.
