Essential services are those required for the safety of personnel and for the safe navigation and propulsion of the ship. They include certain supplies to navigational aids, communications, machinery spaces, control stations and steering gear.
What is electrical power supply of a ship?
Shipboard power is generated using a prime mover and an alternator working together. For this an alternating current generator is used on board. The generator works on the principle that when a magnetic field around a conductor varies, a current is induced in the conductor.
What are the services to be supplied from the emergency generator?
The emergency generator must be rated to provide power for the driving motors of the emergency bilge pump, fire pumps, steering gear, watertight doors and possibly fire fighting equipment. Emergency lighting for occupied areas, navigation lights, communications systems and alarm systems must also be supplied.
How is important the electrical power on board?
An electrical distribution board is a crucial part of an electrical installation for a commercial building. Its purpose is to distribute the power supply evenly throughout the building by way of different circuits. The incoming power has to be controlled in this manner to prevent any overloads from occurring.
What is the meaning of essential power?
→ The essential power is piggy backed off the incoming side of the main. switch, which means the power cannot be turned off and therefore is always available for fire safety.
Which current is used in ship?
Electrical power onboard a ship is commonly generated at 440V, 60Hz (sometimes 380V, 50Hz). These values have been adopted because they are standard shore supplies in the American and European continents.
How does a fresh water generator work?
A unit used for conversion of seawater into fresh water by vacuum distillation based on evaporation and condensation. Single-stage freshwater generator consists of a chamber with two titanium plate packs acting as an evaporator and a condenser respectively.
What is difference between motor and generator?
Difference Between Motor and Generator in Detail
An electric motor converts electrical energy into mechanical or kinetic energy, whereas the electric generator transforms the electric energy into mechanical/kinetic energy.
What are two methods of auto starting an emergency generator?
According to general requirement, at least two modes of starting an emergency generator should be available. The two modes should be – battery start and hydraulic or pneumatic start.
How many hours does the emergency powers source can supply all the equipment in the ESB?
Emergency power source, Emergency generator must be sufficient to operate certain essential services at least for the period of 18 hours .
How does ship get electricity?
Ships have been “semi-electric” for many years
They burn fossil fuels – diesel, heavy oil, gas oil. Traditionally, this type of drive is mechanical: The diesel engine drives a shaft that then moves the ship’s propeller. The engine or a generator also generates electricity for all the electrical systems on the ship.
What is the working voltage of the ship power system?
Typical Marine HV systems operate usually at 3.3kV or 6.6kV.
What connects power from the alternators to the main switch board?
The Power generated by these marine generators is transported to the Main switchboard using Busbars. … All high voltage and high current systems are connected by bus bars.