Electrical Main

Question 1

DC converter parameters

Answer 1

115 V AC to 28 V DC

Question 2

What kind of battery

Answer 2

24 V DC NiCad battery

Question 3

Main purposes of the Battery?

Answer 3

Start the APU and power the Battery utility bus

Question 4

Main Generator parameters

Answer 4

30-45 kVA AC, 115 V, 3 phase 400 Hz gen, oil cooled

Question 5

APU Generator parameters

Answer 5

35 kVA AC, 115 V, 3 phase, 400 Hz, air cooled

Question 6

What do the GCUs do/monitor?

Answer 6

connects the generator to the AC bus, regulates output, protects the system from over/undervoltage, feeder faults, under frequency

Question 7

What Nr do the GCUs cut the gens off from the system when WOW? (underfrequency protection)

Answer 7

94%

Question 8

What Nr do the GCUs cut the gens in flight?

Answer 8

Approximately 80% Nr

Question 9

What Nr is needed for the GCUs to reconnect the generators?

Answer 9

97%

Question 10

What is Ext Power monitored for?

Answer 10

phase rotation, over/under voltage, over/underfrequency

Question 11

Ext power sys has a ___ amp circuit breaker that places a ___ amp draw

Answer 11

4,2

Question 12

What are the AC buses?

Answer 12

1/#2 AC Primary, AC Essential, AC Secondary, AC Monitor

Question 13

What buses does the #1 Gen normally power?

Answer 13

1 AC Pri, AC Essential, AC Secondary

Question 14

What buses does the #2 Gen normally power

Answer 14

2 AC Pri, AC Monitor

Question 15

Three greedy pigs that will always be powered if power is sufficient and buses they are one?

Answer 15

1. Back up Hyd Pump on #1 AC Pri
2. Mission Avionics on AC Secondary (T/R deice also powered from here)
3. Main Rotor Deice on AC Monitor

Question 16

What happens if any generator is brought online while connected to Ext Power?

Answer 16

Kicks Ext power off

Question 17

What buses power the DC converters?

Answer 17

1 and #2 AC Primary buses

Question 18

What 3 buses will the battery power?

Answer 18

Batt Util, Batt, DC Essential

Question 19

With a ___% charge, normal battery life is good for ___ during the day and ____ at night

Answer 19

80%, 11 min, 9 min

Question 20

What does the battery analyzer/conditioner do?

Answer 20

Monitors battery system for fault conditions, battery charge, internal temp, cell conditions, and provides battery charging capability

Question 21

What happens if the analyzer/conditioner detects a fault?

Answer 21

Disconnect DC loads from the battery or secures the battery from the charging circuit as appropriate

Question 22

What buses are involved in charging the battery?

Answer 22

2 AC Pri powers the charging circuit of the analyzer/conditioner, #2 DC Pri provides the charging power itself

Question 23

What are the DC buses?

Answer 23

1/#2 DC Primary buses, DC Essential, Battery Bus, Battery Utility Bus

Question 24

What does the #1 DC converter normally power

Answer 24

1 DC Primary, DC Essential, Battery bus

Question 25

What does the #2 DC converter normally power

Answer 25

2 DC pri

Question 26

What bus does the battery normally power

Answer 26

Batt Util

Question 27

What happens if one converter fails

Answer 27

The other one picks up the load

Question 28

What happens if both converters fail

Answer 28

Batt picks up the load of Batt Bus (if batt switch is on) and DC essential (if batt above 35% charge) on top of the Batt util

Question 29

Is batt util bus powered when batt switch is off?

Answer 29

yes

Question 30

Below what battery charge will we lose the ability to blow fire bottle cads if all other dc power is lost?

Answer 30

30%

Question 31

What causes a battery fault caution

Answer 31

battery overtemp or cell dissimilarity

Question 32

how many circuit breaker panels

Answer 32

10