Ship switches are usually very reliable electrical devices. Most switches on vessel are designed to operate 100,000 times or more without failure if the voltage and current ratings are not exceeded. Even so, ship switches do fail. The following information will help you in troubleshooting switches. Replacement of ships switches When a ship […] Read more
ships, voltages upto and equal to 1000 volts is called as low voltage system and voltages above 1000 volts is called high voltage system. Normally low voltage system is common on board. But rising demand for power due to heavy consumers on new ships require an efficient and surplus power supply. The answer is high […] Read more
Grouped cables are reduced to single lines for convenience and then continued in a normal or crossed arrangement. The sample illustrates cable DSE-55, shown by a heavy line, which connects two appliances (=A1.2 and =A5) into common circuitry. The cable conductors (cores 1 to 10) are shown as light lines. Next sample illustrates the entire […] Read more
What is ship Ballast? Heavy material, such as pig iron or water, stored in the bottom of the ship to keep her steady. Modem ships have ballast tanks built into them. When a ship has discharged her cargo and sails empty she is ballasted by flooding water into her ballast tanks to give her stability. […] Read more
What does an electro technical officer do? An electro technical officer handles several responsibilities on vessel mainly related to electrical system... Read more
All the machinery onboard ship is a combination of mechanical and electrical systems. The modern day shipping is more reliable on automations and elec... Read more
Sometimes a few turns in the secondary winding of a transformer experience a partial short, which in turn causes a voltage drop across the secondary.... Read more
A ship’s electrical distribution scheme generally follows shore practice. This allows normal industrial equipment to be used on board ship after... Read more
ETO on AHTS DP1 ETO on AHTS DP1 -LOCATION: Saudi(ARAMCO) -DURATION: 3+-1 -SALARY: 130$ per/day SHOUL... Read more
The purpose of the ship transformer is to isolate the different parts of the electric power distribution system into several partitions, normally in order to obtain different voltage levels and sometimes also for phase shift. Voltage Distortion on Ship Power Network Phase shifting transformers can be used to feed frequency converters, e.g. for variable speed […] Read more
Embossed metal tags are used to identify cables throughout the vessel. The tags are located at the distribution panel and the component. Tags are also attached to the cables where penetration of the bulkhead is necessary. The tag code will start with the type of circuit it is. Vessels use P to indicate power distribution panel […] Read more
Usually electrical systems ashore are seldom operated at constant load, day and night and also for long periods. In the shore-based industry there are peak loads and off-peak loads; these factors have considerable effect on the life of equipment. They also may be re-modelled as new production lines and concepts are introduced or new machine […] Read more
The central section of the main switchboard is used for the control of the main generators. The switchgear cubicles on either side of the generator panels are used for essential services and flanking these are the grouped motor starter panels. Handles for opening the doors on switchboard cubicles are usually linked (or interlocked) to an isolating-switch. […] Read more
This is one of the greatest discoveries of all time where electrical energy – the easiest way to transfer power over great distances, is obtained from mechanical energy which in turn is derived from: A basic form of fossil fuel namely diesel, petrol and kerosene; Conventional means namely gas, steam, and water turbines; Non-conventional means […] Read more
As per Equation, increasing the field current If increases Ef . One can visualize that higher (longer) Ef in turn increases the terminal voltage VT or the power factor angle θ, increasing the lagging reactive power output (kVAR) of the generator. The generator can supply more lagging kVARs to the load until If reaches its […] Read more
To successfully carry out the various test procedures suggested in this manual, certain test instruments are essential. The following lists detail the basic requirements in this respect. It should be noted that in addition to these instruments a comprehensive kit of tools is also essential. For fault finding purposes this need not include any specialised […] Read more
The cooling system runs on the following standard layout: The central freshwater cooling system with single-stage scavenges aircooler and a separate HT circuit. As freshwater is the standard cooling medium of the scavenge air cooler(s), this involves using a central freshwater cooling system. The central freshwater cooling system comprises “low-temperature” (LT) and “high-temperature” (HT) circuits. […] Read more
Power currents (a. c.) can be measured simply by means of a clamp meter which acts as a current transformer. The instrument tongs are clipped round a single insulated conductor – the circuit is not interrupted. The value of current is obtained from the magnetic flux strength around the conductor and is usually displayed on […] Read more
The main advantages of Insulated neutral ship’s system are: – Continuity of service on a ground fault – Ground fault currents can be kept low The main disadvantages of Insulated neutral ship’s system are: – High level of insulation may be necessary. – High transient over – voltages may occur – Grounded circuit detection […] Read more
The concept of electric propulsion is not new, the idea originated more than 100 years ago. However, with the possibility to control electrical motors with variable speed in a large power range with compact, reliable and costcompetitive solutions, the use of electrical propulsion has emerged in new application areas during the 80’s and 90’s.Electric propulsion […] Read more
