Important Electrical Shit

Question 1

When the RAT is OOS, what is the voltage set at?

Answer 1

133V

Question 2

When the RAT is I/S, what does the LTC control voltage at?

Answer 2

120V

Question 3

For SPLIT BUS ALIGNMENT, what is the normal position of Breaker BD?

Answer 3

Open

Question 4

TR-5 supplies which train of reserve feed?

Answer 4

B

Question 5

TR-9 supplies which train of reserve feed?

Answer 5

A

Question 6

On a Reactor or Turbine Trip, is there a time delay for the HEA to trip?

Answer 6

30 sec

Question 7

On a generator trip, is there a time delay for the HEA trip?

Answer 7

No

Question 8

What does it mean when the NSYNC Light goes out on a CRID?

Answer 8

Alt source is lost

Question 9

What happens when you press ALT SOURCE TO LOAD on a CRID?

Answer 9

Electrically transfers load from inverter to alt source

Question 10

What is the direct consequence of pressing the Emergency Trip PB?

Answer 10

HEAs trip

Question 11

How will you get the exciter field breakers to close in U1?

Answer 11

must have the voltage reg in Manual

Question 12

Will the exciter field breakers open if the Gen Output breakers are closed?

Answer 12

NO

Question 13

What does the capability curve for TDB 11-5 look at ?

Answer 13

MVARS

H2 pressure

Question 14

What does the main exciter do?

Answer 14

generates 3 phase that is applied to stationary rectifiers

Question 15

What does the generator synchscope rotating slowly in the fast direction mean?

Answer 15

Gen Frequency higher than Grid Frequency

Question 16

What is the hydrogen flowpath in the generator?

Answer 16

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

Question 17

What is the purpose of the Thyrister Converters in U2?

Answer 17

Changes output of the Pilot Exciter to DC

Question 18

What is the U1 bus duct cooling flowpath?

Answer 18

fans

out middle phase

to xfmrs

back north and south

cooler

Question 19

What is the U2 bus duct cooling flowpath?

Answer 19

fans

out South

to xfmrs

back north and middle

cooler

Question 20

What is the purpose of the deionizing baffles in the bus duct cooling?

Answer 20

prevent arcing from phase to phase

Question 21

What happens if you lose 2 bus duct cooling fans?

Answer 21

must reduce to max of 10K amps per phase

~40% power

Question 22

What is the U2 response if the exciter field breaker opens during normal power Operation?

Answer 22

The generator will lose excitation; the Unit HEA relays will be energized