Open AccessELECTRIC POWER DISTRIBUTION IN BULK SYSTEM ON BOARD BIG VESSELS
Author(s) -
Aleksej Vladimirovich Melikov
Publication year - 2019
Publication title -
vestnik astrahanskogo gosudarstvennogo tehničeskogo universiteta. seriâ: morskaâ tehnika i tehnologiâ
Language(s) - English
Resource type - Journals
eISSN - 2225-0352
pISSN - 2073-1574
DOI - 10.24143/2073-1574-2019-2-110-117
Subject(s) - electrical engineering , electric power transmission , voltage , engineering , power (physics) , transformer , electric power system , physics , quantum mechanics
The article describes the schemes of the radial power distribution system of the bulk system on board big ships. Today, when the ship power plants have great capacity, it is found preferable to use a four-wire three-phase system that has a distributed neutral and is not connected to the ground, in which the linear voltage can be easily utilized. The main distribution network of medium voltage can be of a simple radial type with substations or additional distribution switchboards. The advantages of a simple radial scheme on board a large vessel include providing selective protection and using digital automation. The weak points are the impressive amount of protective and switching appliances, high cost, significant power losses, length of wires, and threat to the reliability of the vessel due to the main switchboard failure. A There is presented a multi-part radial chart, in which the number of circuits going from the main switchboard and devices in it is significantly reduced. This chart is considered more suitable for medium-size power plants on large vessels. The calculation was carried out at a steady state of the radial network, the sections and wires of power lines were determined. Power losses in transformers and power supplied to substation bus-lines have been calculated. Before selecting the wires it was recommended to calculate the current flowing through the circuit. The ship power supply with a bridge ring scheme has been considered. In the event of a failure, only a part of the generators and a half of energy will be available. There has been given a conditional division of the power systems with a bridge ring circuit on board into three main parts. A diagram of the high-voltage power supply from the shore is shown. One of the main advantages of this technology is environmentally friendly nature of electricity produced by power plants on the coast, compared to the ship diesel engines running on burner fuel. This technology reduces pollution and improves air quality in port areas.