| A | B |
|---|
| 112.1a State the function of the Ships Service Turbine Generators | 4 SSTGs uppor level engineroom 450V 60Hz 3 phase to switchboard - PRODUCES POWER |
| 112.1b State the function of the Switchboards | 6 switchboards 1S, 2S, 1SAS, 2SAS, Shore Power, Emergency Switchboard - Distribute power, protects dist system w/breakers, controls, monitors, and protects SSTGs |
| 112.1c State the function of the Shore Power Connections | What ship receives power from the pier through - 10 cables |
| 112.1d State the function of the Motor Generators | 2 in engineroom 450v 400hz |
| 112.1e Load/Control Centers | provide power to electrical loads in electrical zones - 2 engineroom/1 fireroom |
| 112.1f Casualty Power Cables | 93a continuous, 200A for 2 hr - used when vital cables are damaged |
| 112.2 State the function of the 60 Hz Ship Alongside Distribution system. | To distribute power to ships/subs alongside |
| 112.2A State the max electrical capacity of the SSTG. | 2500 kW, 400a, 450V, 60 Hz, 4 SSTGs |
| 112.2b State the max electrical capacity of the Shore Power Connections | 400a |
| 112.3 Explain the 60/400 Hz Distribution system. | 400 Hz is for electronic equipment, 60 Hz for all other gear. |
| 112.4 State the purpose and type of cathodic protection. | To prevent corrosiion of the ships hull. CAPAC |
| 112.5a Define and state the purpose of Selective tripping | when a system will trip breakers around the fault |
| 112.5a2 Define and state the purpose of Selected tripping | when a system is tripped manually |
| 112.5b Define and state the purpose of ungrounded electrical system | ??? No entry |
| 112.5c Define and state the purpose of Ground protection device/circuits | ??? No entry |
| 112.5d Define and state the purpose of Reverse power relay | motor changes electrical to mechanical, prevents generator from acting like a motor which protects prime mover |
| 112.5e Define and state the purpose of Load shedding | when shifting the load from ship to shore power, load has to be down to 2 kA - Casualties or short circuits if generators get close to the rated maximum |
