EPRI CHAPTER 3 Flashcards
THERMAL LIMITS ARE THE DIRECT RESULT OF
THE THERMAL CAPABILITY OF SYSTEM EQUIP.
REACTIVE POWER FLOW IS INFLUENCED MORE BY SYSTEM POWER AND TORQUE ANGLES THAN REACTIVE POWER
FALSE
AT WHAT LINE POWER ANGLE DOES THE MW TRANSFER ACROSS A TRANSMISSION PATH EQUAL 1/2 OF THE PATH’S PMAX
30 DEGREES
A TRANSMISSION LINE IS RATED 1000MVA. THE POWER FLOW IS CURRENTLY 0 MW AND 1001 MVAR. IS THE TRANSMISSION LINE OVERLOADED?
YES
THE TTC LIMIT HAS BEEN DETERMINE TO BE 1000 MW FROM EAST TO WEST FOR A PARTICULAR TRANSMISSION PATH. THE TRANSMISSION PATH OPERATOR SELL 500 MW OF THE TTC. WHAT IS THE PATHS ATC?
500 MW
A DISTRIBUTION LINE IS RATED 50 MVA. THE LINES POWER FLOW IS CURRENTLY 50MW AND -50MVAR. THIS DISTRIBUTION LINE IS OVERLOADED.
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 THE RESISTANCE IS IGNORED THE MAXIMUM THEORETICAL MVAR FLOW ACROSS A TRANSMISSION LINE WILL OCCUR AT POWER ANGLE OF
180 DEGREES
200 MW IS SCHEDULED TO FLOW FROM BUS “X” TO BUS “Y”. TRANSMISSION LINE A-B HAS A 10% DISTRIBUTION FACTOR FOR THIS SCHEDULE. HOW MUCH OF THE 200 MW SCHEDULE WILL FLOW ON TRANSMISSION LINE A-B
20 MW
COMPLEX POWER IS THE VECTORIAL DIFFERENCE OF ACTIVE AND REACTIVE POWERS
FALSE
THE GREEK LETTER THETA IS USED TO REPRESENT WHAT
PHASE ANGLE
A SYNCHROSCOPE IS USED TO COMPARE FREQUENCY VOLTAGE PHASE ANGLE AND VOLTAGE MAGNITUDE
TRUE
IF TWO POWER PATHS ARE AVAILABLE LESS POWER WILL FLOW ON THE PATH WITH THE LEAST IMPEDANCE
FALSE
A PHASE SHIFTING TRANSFORMER (PST) PRIMARY FUNCTION IS TO
ADJUST THE FLOW OF ACTIVE POWER
