GTGs

Question 1

GTG Rating

Answer 1

3000 KW at 450 VAC, 4800 Amps, 60 Hz, 3 phase, 0.8 power factor

Question 2

ZEDS

Answer 2

Zonal Electrical Distribution System

Question 3

Electrical distribution system components

Answer 3

• 3 GTGs
• 3 Switchboards
• 23 Load Centers
• 10 Lighting Load Centers (LTG LCs)
• Power Panels (PPs)
• Power Distribution Boxes (PDBs)
• Manual or Auto. Bus Transfer (MBT/ABT), and Static Automatic Bus Transfer units (SABT)
• Lighting Distribution Panels
• Lightin Distribution Boxes
• Power and lighting Transformers
• Casualty Power distribution system

Question 4

ZEDS

Zones

Answer 4

1-5 Fwd –> Aft
6 –> 01 level up

Question 5

Start Permissives for the GTG

Answer 5

1. Cooling fan running or in auto
2. RPM <600 for Bleed Air starts
3. RPM <1215 for RIMSS start
4. No shutdowns active or illuminated
5. Not in Input/Output (I/O) mode
6. Not motoring
7. Hard Wire Fuel Trip (HWFT) off

Question 6

Lubrication oil for the GTG

Answer 6

23699

Question 7

Stages that Bleed Air is extracted from

Answer 7

5th, 10th, and 14th
5 &10: Are open to the atmosphere during start to prevent stalling of the compressor
14: Vented to the atmosphere using diffuser valves
- Primary source of bleed air for the ship