To begin with, three fundamental conditions must exist before a voltage can be produced by magnetism. These conditions are:
- A conductor, in which the voltage will be produced
- A magnetic field in the conductor’s vicinity
- A relative motion between the field and the conductor. The conductor must be moved so as to cut across the magnetic lines of force, or the field must be moved so that the lines of force are cut by the conductor
What is the rating for the SSGTG?
450 VAC
60 HZ
4009 AMPS
2500 KW
3 Phase
.08 PWR Factor
What is considered self-sustained speed of a GTG, and what speed does it occur?
9700 RPM
What are your ADP Permissive?
What do you place the SWBD in Local/Remote IAW?
What are SWBD Logics?
Name the 5 SWBD Safeties?
Reverse Power Relay: Prevents power from flowing backward into the generator.
Automatic Paralleling Device: Synchronizes generators for safe and efficient power transfer.
Fault Current Detector: Detects and isolates electrical faults to prevent damage.
Load Shed (Over Power Relay): Reduces load to prevent generator overload.
Dead Bus Logic (Under Voltage Relay): Ensures proper startup and reconnection of power after a voltage loss.
What net do you man a SWBD casualty?
ABT stands for Automatic Bus Transfer?
In the Navy, Automatic Bus Transfer (ABT) systems are crucial for maintaining continuous power to vital equipment.
Automatically switch critical electrical loads from the normal power source to an alternate source during power failure or abnormal conditions.
Return to the normal source once power is restored, provided the ABT is in auto mode.
Ensure operational readiness and safety by supporting essential systems, such as:
Navigation, communications, and combat equipment.
CRP (Controllable Reversible Pitch) system.
FPM (Fuel Pump Motor).
Fuel pump, Sea Water (SW) pump, and Lube oil system.
Manual Bus Transfer (MBT)?
Allows personnel to manually switch electrical loads between a normal power source and an alternate power source. This process is not automatic and requires an operator to perform the transfer. MBTs are typically used for non-vital equipment, where immediate power restoration isn’t critical, unlike ABTs which handle vital systems automatically.
LVP (Low Voltage Protection)/LVR (Low Voltage Release)
LVP (Low Voltage Protection): A safety feature that prevents equipment from restarting automatically after a power failure. It ensures that machinery remains off until manually restarted, avoiding potential hazards.
LVR (Low Voltage Release): A feature that allows equipment to restart automatically once power is restored, provided the control switch is still in the “on” position.
A ground on the 60 Hz = 440V Equipment
M-1 Check
Start by using the Ground Check Button to detect the presence of a ground. This is a crucial step in identifying grounding issues.
Procedure
Isolate SWBS (Shipboard Electrical System): Begin by isolating the affected section of the electrical system to minimize risk and identify the issue.
Inspect Load Centers: Check load centers systematically for faults or ground indications.
Check Power Panels: Examine power distribution panels to pinpoint where the grounding issue originates.
Inspect PDB (Power Distribution Boxes): Investigate the power distribution boxes for any faults or visible damage.
Examine Equipment: Finally, review connected equipment for any defects or grounding issues.
Definition of a Ground
A ground occurs when a path of electricity unintentionally connects to the hull of the ship, providing a conductive route that can lead to safety hazards or equipment malfunctions.
Why is DROOP utilized when paralleling to shore power?
Due to dissimilar prime movers and shore power’s infinite bus.
What That Means:
DROOP Control is a method used in generator systems to regulate load sharing when multiple power sources are operating in parallel.
Dissimilar Prime Movers: When your ship’s generator (diesel, gas turbine, etc.) is connected to shore power, the two systems may have different mechanical characteristics. This mismatch can cause instability if not managed properly.
Infinite Bus (Shore Power): Shore power is considered an “infinite bus” because it has a massive capacity compared to the ship’s generator. It maintains a constant frequency and voltage regardless of load changes.
⚙️ Why DROOP Helps:
DROOP allows the ship’s generator to adjust its output based on load, without trying to control the system frequency (which is dominated by shore power).
It prevents the generator from fighting the shore power to control frequency or voltage, which could cause damage or instability.
It ensures smooth load sharing and protects equipment by letting the generator respond passively to changes.
What is the purpose of a shorting probe?
A shorting probe is a safety tool used when working on electrical circuits. Its job is to safely release any leftover electricity stored in a capacitor by connecting it to ground. This prevents electric shock or damage when someone starts maintenance or repairs.
What is utilized to determine a casualty power route?
Ships Casualty Power BIll
Casualty power cables should be rigged source to load or load to source?
Casualty power cables should be rigged load to source, and here’s a simple way to understand why:
🔌 “Load to source” means you start at the equipment that needs power (the load), and connect toward the power source.
This method keeps things safe and controlled. By starting at the load, you can make sure each connection is secure before energizing the cable. It helps prevent accidental arcing or shock, especially in emergency situations when power is being restored quickly.
What is the function of static frequency chargers?
Static frequency are power conversion system which electronically covert 60Hz type I power to 400Hz type III power.
A static frequency converter (or charger) is a device that changes the type of electricity from one frequency to another. In this case, it takes 60Hz power (like what you get from a wall outlet) and converts it to 400Hz power.
IAW NSTM 300 the EPCC should check for grounds using the ground detector at how often?
IAW NSTM 300, the EPCC (Electric Plant Control Console) operator should check for grounds once every watch—which means once during their shift.
This is done to:
Catch problems early before they get worse.
Keep the electrical system safe and working properly.
Make sure no hidden faults are developing that could cause damage or injury.
To locate an individual circuit causing a ground you should….
Selectively open and close breakers in the distribution panel from load to source.
If there’s a ground (an unwanted electrical connection to the ship’s metal structure), you need to find which circuit is causing it. To do that, you:
👉 Start at the equipment (the load) and work your way back toward the power source, opening and closing breakers one at a time.
This helps you narrow down which circuit is grounded. By checking each one in order, you can safely isolate the problem without shutting down everything at once.
