EPRI ch 3 Flashcards
Thermal limits are the direct result of?
The thermal capability of the system equipment.
Reactive power flow is influenced more by system power and torque and torque angles than reactive power
T or F?
False
At what line power angle foes the MW transfer across a transmission path equal 1/2 of the path’s pMAX?
30 degrees
A transmission line is rated 1000 MVA. The power flow is currently 0 MW and 1000 MVar. Is the transmission line overloaded?
Yes
The TTC limit has been determined to be 1000 MW from East to West for a particular transmission path. The transmission path operator sells 500 MW of hte TTC. What is the path’s ATC?
500 MW
A distribution line is rated at 50 MVA. The line’s ppwer flow is currently 50 MW and -50 MVar. This distribution line is overloaded.
T or F
True
Angle stability limits are the result of?
High torque and power angles
If the resistance is ignored, the maximum theoretical MW flow across a transmission line will occur at a power angle of ______
90 degrees
If resistance is ignored, the maximum Mvar flow occurs at an angle near ____.
180 degrees
200 MW needs to flow from bus X to Y. Transmission line A-B has a 10%f distribution factor. How much of 200MW will flow on line A-B?
20MW
Complex power is the vectoral difference of active & reactive power
false
The Greek letter theta is used to represent the ____.
phase angle
A synchroscopen compares the frequency, voltage, phase angle, + voltage magnitude
true
If two power paths are available, less power will flow on the path with the least impedence
false
A phase shifting xfmr (PST)’s primary function is to _____.
adjust the flow of active power
