Some ships are equipped with a shaft generator, which is connected to the main engine. When the main engine has a rated load, the shaft generator can meet the entire electrical equipment of the ship. When the main motor load is too low. not enough to meet the electrical needs of the entire ship, the diesel generator operates. But not all ships are equipped with shaft generators, so they must be equipped with diesel generator sets. Electricity consumption is just one reason.
What are the particularities of ship generators compared to land engines?
There are usually three electrical power systems on board. Normal power supply is provided by the generator, which is located in the engine room; completely damaged or generator main switch and distribution board (Power emergency lightingand equipment related to the safety of navigation on the ship when other parts are damaged and the generator cannot provide power)) is powered by the emergency generator, which is located in the emergency engine room on the top floor of the ship's accommodation building (a ship is on the deck of the boat); DC battery (in the event of emergency generator failure), it powers the ship's most important lighting and communications systems. The electrical and mechanical department of the ship's power plant is responsible for this.
Countless land engines make up the land's electrical network if one or more of them is faulty or if the voltage or power is unstable, the impact on the entire terrestrial electricity network will be very small and can be ignored. However, the ship's engines power the ship's electrical grid. A small problem with one of them can have a big impactact on the electricity network. The vibrations caused by the vessel during navigation require the motor to be able to provide efficient electrical power even when it is oscillating. There are also many high-power electrical equipment on ships. If these equipments are suddenly shut down, it will have a significant impact on the power grid and motors, and even motors may be overloaded and tripped.
Ship engines therefore have more protection and regulation systems.