start up

Question 1

why do we purge the furnace?

Answer 1

-to remove all fuel and combustibles from all zones of the furnace and associated duct work

Question 2

what will happen if no fires are established after the purge is complete?

Answer 2

-if the master fuel trip relay is reset, after 5 minutes you will get a delayed lightoff MFT

Question 3

how fast can the drum pressure be increased during firing?

Answer 3

-the pressure should be raised at a rate equaling an increase of 100 degrees fahrenheit per hour pf the saturation temperature

Question 4

describe the process used to establish generator voltage and place it in automatic

Answer 4

• close the 41A breaker on the panel Mate
• the generator field is flashed and the system voltage ramps up to 21kv in manual mode, after approximately 30 seconds the system transfers from manual mode to auto mode control. the AC breaker button goes red and the mode select button goes red

Question 5

what processes must be matched to synchronize the generator to the system?

Answer 5

• generator to system voltage
• generator to system frequency (synch scope needle revolution speed and direction)
• generator to system angle (synch scope needle position)

Question 6

after connecting the generator to the system why must we immediately pick up load?

Answer 6

-to get the load above the no-load setting to prevent generator motoring

Question 7

how is the first stage metal temperature (rotor stress) controlled during stand by loading?

Answer 7

-by controlling superheat temperature, boiler rate of increase and load ramp rate