EPRI CHAPTER 4 Flashcards
ACCORDING TO THE LOAD/FREQ. RELATIONSHIP A 1% CHANGE IN FREQ. WILL LEAD TO WHAT APPROXIMATE MAGNITUDE OF LOAD CHANGE IN A TYPICAL 10000 MW SYSTEM?
200MW
A GOVERNOR WITH A 0% DROOP IS CALLED?
A ISOCHRONUS GOVERNOR
STEAM TURBINE GENERATORS TYPICALLY HAVE BETTER GOVERNOR RESPONSE THAN HYDRO-ELECTRIC GENERATING UNITS
FALSE
A CONTROL AREA’S FREQ. BIAS SETTING IS EQUAL TO
ALL OF THE ABOVE
ALL OF THE FOLLOWING ARE MODES OF AGC EXCEPT
ISOCHRONUS CONTROL
IN WHICH STAGE OF A GENERATORS RESPONSE TO A SYSTEM DISTURBANCE IS THE POWER FLOW SUPPORTED PRIMARILY BY THE GENERATORS EXCITATION SYSTEM
ELECTROMAGNETIC ENERGY STAGE
IF SYSTEM FREQ. WERE TO RUN AT 60.02 HZ FOR TWO CONSECUTIVE HOURS HOW MUCH POSITIVE TIME ERROR WOULD OCCUR
2.4 SECONDS
A CONTROL AREA HAS A BIAS OF -150 MW. FREQ. FALLS 0.05HZ DUE TO AN EXTERNAL DISTURBANCE. HOW MANY MW WOULD YOU EXPECT THIS CONTROL AREA TO PROVIDE TO THE DISTURBANCE?
75
AN ISOCHRONOUS GOVERNOR HAS A DROOP SETTING OF
0%
WHAT ELEMENT OF THE POWER SYSTEM IS TYPICALLY MOST SUSCEPTIBLE TO DAMAGE FROM PROLONGED OPERATION AT FREQ. ABOVE OR BELOW 60HZ
LOW PRESSURE TURBINE STAGE BLADES
THE NORTH AMERICAN POWER SYSTEM IS DIVIDED INTO AREAS CALLED INTERCONNECTIONS
TRUE
TIME ERROR PROBLEM: 60HZ=NO TIME UNDER-GENERATION=FAST TIME OVER-GENERATION=SLOW TIME ERROR
FALSE
ALL LOADS CAN BE DIVIDED INTO TWO GENERAL TYPES THEY ARE NON MOTOR LOAD AND MOTOR LOAD
TRUE
IF THE VOLTAGE FALLS ENOUGH IT WILL CAUSE THE MOTOR TO SPEED UP
FALSE
ELECTRIC GENERATORS USE A _______ CONTROL SYSTEM TO CONTROL SHAFT SPEED
GOVERNOR
