Important Electrical Shit Flashcards
When the RAT is OOS, what is the voltage set at?
133V
When the RAT is I/S, what does the LTC control voltage at?
120V
For SPLIT BUS ALIGNMENT, what is the normal position of Breaker BD?
Open
TR-5 supplies which train of reserve feed?
B
TR-9 supplies which train of reserve feed?
A
On a Reactor or Turbine Trip, is there a time delay for the HEA to trip?
30 sec
On a generator trip, is there a time delay for the HEA trip?
No
What does it mean when the NSYNC Light goes out on a CRID?
Alt source is lost
What happens when you press ALT SOURCE TO LOAD on a CRID?
Electrically transfers load from inverter to alt source
What is the direct consequence of pressing the Emergency Trip PB?
HEAs trip
How will you get the exciter field breakers to close in U1?
must have the voltage reg in Manual
Will the exciter field breakers open if the Gen Output breakers are closed?
NO
What does the capability curve for TDB 11-5 look at ?
MVARS
H2 pressure
What does the main exciter do?
generates 3 phase that is applied to stationary rectifiers
What does the generator synchscope rotating slowly in the fast direction mean?
Gen Frequency higher than Grid Frequency
What is the hydrogen flowpath in the generator?
Fans on both ends
along rotor shaft and stator core
thru gaps and vent holes
back thru center of rotor and stator
Coolers
Suction of fan
What is the purpose of the Thyrister Converters in U2?
Changes output of the Pilot Exciter to DC
What is the U1 bus duct cooling flowpath?
fans
out middle phase
to xfmrs
back north and south
cooler
What is the U2 bus duct cooling flowpath?
fans
out South
to xfmrs
back north and middle
cooler
What is the purpose of the deionizing baffles in the bus duct cooling?
prevent arcing from phase to phase
What happens if you lose 2 bus duct cooling fans?
must reduce to max of 10K amps per phase
~40% power
What is the U2 response if the exciter field breaker opens during normal power Operation?
The generator will lose excitation; the Unit HEA relays will be energized
