Power Generation System

Question 1

State what the LT/W, J/W, and S/W cool in the generator system.

Answer 1

LT/W - Charge air, L/O, Alternator
J/W - Cylinders
S/W - Coolants (LT/W, J/W)

Question 2

State Tiers 0, 1, 2, 3A, 3B, & 4 for the generator system & their locations.

Answer 2

Tier 0: Generator ASP in M/E
Tier 1: Generator LOP in M/E
Tier 2: Local Main Switchboard in the E/R
Tier 3A: EGCMS in MCR
Tier 3B: Remote Main Switchboard in E/R opposite to generator
Tier 4: SCMMS in MCR

Question 3

State the differences between Manual, Semi-Auto, and Auto modes of operation for the generator system.

Answer 3

Aux Engine:
Semi-Auto & Manual - Manual start & stop
Auto - A/E start/stop controlled by EGCMS, cuts in/out according to set parameters

Generator Circuit Breaker:
Manual - Manual open & close
Semi-Auto & Auto - GCB opens/closes automatically when engine is stopped/running.

Aux Engine Speed:
Manual - Manually increase & decrease speed
Semi-Auto & Auto - A/E speed controlled by EGCMS, changes according to load requirement

Question 4

Define the first priority generator and explain why the ship rotates the first priority generator every day.

Answer 4

The first priority generator starts up the first and shuts down the last in “AUTO” mode.
This is to make sure each generator has equal work which maintains the health of the generators.

Question 4

State the 8 pre-start checks for the generator system.

Answer 4

1. Check header tank, ensure L/O & Coolant sufficient
2. Sea Chest and Overboard Discharge Valve open
3. Check for leakages
4. Start air valve open
5. Lamp Test
6. Barring Gear disengaged
7. Test E-Stop
8. Flush bottles and manifold

Question 5

State the 8-step start-up procedure for the LOP, the MSB and the EGCMS.
(Hint: Set A)

Answer 5

Set A:
1. Switch ASP to “LOCAL”
2. Press L/O priming p/p “START” button
3. Wait for L/O pressure to stabilize (around 2 bar)
4. Switch ASP to “REMOTE”
5. Check for leaks

LOP:
1. Set A
2: Switch LOP to “LOCAL”
3. Press “ENGINE START”. Ensure “ENGINE PROTECTED” light is lit up
4. Check for leaks

MSB:
1. Set A
2. Switch LOP to “REMOTE”, MSB to “LOCAL”
3. Press “START”
4. Check for leaks

EGCMS:
1. Set A
2. Switch LOP to “REMOTE”, MSB to “REMOTE”
3. Press “START”
4. Check for leaks

Question 6

State the procedure to changeover supply from ship to shore.

Answer 6

1. Reduce load on first priority generator until current 600-700A through turning off ballast p/ps, fire p/ps, etc.
2. Under SHORE SUPPLY, press “CB ON” once “AVAIL” light is lit. First priority generator will bank out and shut down in “AUTO” mode.

Question 7

State the procedure to changeover supply from shore to ship.

Answer 7

1. Set first priority generator to “AUTO”
2. Press “CB OFF” under SHORE SUPPLY. First priority generator will start-up and bank in in “AUTO” mode.

Question 8

State and explain the 2 general methods for emergency stopping the generator.

Answer 8

1. Cutting off the air supply - This will close the air flaps, no air can enter the generator, combustion cannot be sustained, the generator will stop.
2. Cutting off the fuel supply - Cutting fuel supply to the generator prevents generator from running.

Question 9

State the locations of the 3 emergency stop buttons for e-stopping the generator.

Answer 9

Generator engine, LOP, EGCMS

Question 10

State the 3 backup solutions for e-stopping the generator should the e-stop buttons fail.

Answer 10

Governor lever to cut off fuel supply, Closing the valve named “Air flap shut off G/E #” at Control Air Panel to cut off air supply.

Question 11

State the 2 last resorts to e-stopping the generator should all fail.

Answer 11

FM200/EGRS shutdown
Hydraulic Snap v/v (STBD stairwell)

Question 12

State the 10 parameters that will lead to a safety shutdown.

Answer 12

1. Low L/O p. < 2 bar
2. High L/O temp > 105 °C
3. High J/W temp > 95°C
4. Overspeed trip > 1035 rpm
5. Electrical Overload trip > 817 kW
6. Air Flaps closed
7. Speed Switch failure
8. Extinguishing Gas release
9. Failed to Prime – L/O pressure unable to reach 0.2 bar in 30s
10. Failed to Start – engine unable to reach 150 rpm in 8s

Question 13

State the operating speed, output voltage, and output frequency of the generator.
State the cut in & cut out settings for the generator on “AUTO”.

Answer 13

900rpm, 440V, 60Hz
Cut in: Start and bank in generator if all running generators are generating at 80% max output for 10s or 90% max output for 1s
Cut out: Bank out and shutdown generator if all running generators are generating at 30% max output for 120s

Question 14

State the following normal parameters for when the generator is active:
Start Air
F/O p
L/O temp
L/O p
LT/W temp to charge air cooler
LT/W temp to heat exchanger
LT/W p
J/W temp
J/W p
S/W p

Answer 14

Start Air p - 7 bar
F/O p - 3 bar
L/O temp - 85 degrees C
L/O p - 3-4 bar
LT/W temp to charge air cooler - 35 degrees C
LT/W temp to heat exchanger - 65 degrees C
LT/W p - 2 bar
J/W temp - 82 degrees C
J/W p - 2-3 bar
S/W p - 2-3.5 bar

Question 15

State 2 components from the generator that require the control air supply to function

Answer 15

Generator air flap
Fuel isolation v/v

Question 16

State 4 safety instructions to follow prior to starting the generator.

Answer 16

1. Make sure only qualified personnel can operate
2. Ensure emergency stop button is working
3. Ensure barring gear is disengaged
4. Ensure nothing is blocking rotating parts