A vessel has an extensive electrical system designed to carry out more functions than can be found in a small community. Lighting, instrument panels, steering systems, stoves, and so forth are spread throughout the vessel. Every electrical item must be serviced regularly. Locating the electrical wires can be frustrating. In an emergency situation, restoring electrical […] Read more
Most air circuit breakers used for generator and power switching systems are provided with an automatic release mechanism. Those that do not have an ‘undervoltage‘ or ‘no-volt‘ automatic release (or where one is fitted but is not working) may accidentally remain closed even when a ‘trip‘ condition exists. In such a case, there is a […] Read more
This type of Ship’s Diagram includes basic circuit logic. Electrical components are confined by ‘series and parallel’ rules. These rules are essential in the understanding of the electrical diagram. To place the series and parallel rules into perspective, it is necessary to re-examine the line diagram approach. Voltage drop on Ship Power System Every resistor, […] Read more
Once in a while you may read or hear of a ship “breaking her back” while laboring in a heavy sea, or through suffering structural damage in running aground, or perhaps in a collision. Ship structure pressures The sea exerts immense pressures upon a ship’s structure – especially if the ship is long and narrow. […] Read more
Intermittent Faults on ship electrical system When ships Electrical Engineer ETO need find and diagnose intermittent faults, where a short, open, or o... Read more
To successfully carry out the various test procedures suggested in this manual, certain test instruments are essential. The following lists detail the... 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
The function of a ship’s electrical distribution system is to safely convey the generated electrical power to every item of consumer equipment c... Read more
Looking for an ETO to join research vessel Must hold ETO coc and High Voltage. If interested please... 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
Find and Correct the Cause of Trouble After any electrical failure on ship has been corrected by Electrotechnical Officer (ETO), be sure to locate and correct the cause so the same failure will not be repeated. Further investigation may reveal other faulty components. Also be aware that although troubleshooting charts and procedures greatly help in […] Read more
Protecting an electric motor basically involves preventing the motor from getting too hot. Remember, every 10*C above the maximum recommended temperature of the insulation can reduce its working life by half. Obviously, the best way to protect a motor against overheating is to directly monitor the temperature of the motor windings. If the temperature exceeds […] Read more
To properly understand how these different grounds fit into the vessel’s electrical system, the word “ground” must be understood as it was originally used. Decades ago, when DC tugboats were designed, the term “earth” was used instead of ground. Still later, the tugboats were called positive ground systems. (Foreign cars used to be termed positive […] Read more
Hybrid is a new technology, mostly in early development. In recent years, there’s been a significant increase in battery technology and innovation, particularly in the lithium-type batteries, which could impact multiple market segments. Developments in the automotive sector are driving the need for the next generation of batteries and those will find their way into […] 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 […] Read more
Most multimeters can only measure current up to 10 A maximum. The current measuring facility is intended only for small current components and, in particular, for electronic circuits. The instrument will almost certainly be damaged if it is used to measure the current to motors and other power circuits. The basic current range can be […] 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 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
The rated voltage of an electrical power source is defined as the terminal voltage at full rated load current. The output terminal voltage rises with decreasing load current, rising to its maximum value at zero load (no-load) Ship power system voltage regulation Voltage regulation is a common term used to describe the voltage change that […] Read more
Occasionally a transformer winding becomes completely shorted. In most cases, this activates the overcurrent-protective device (circuit breaker or fuse) and de-energizes the circuit. But in some cases, the transformer may continue trying to operate with excessive overheating due to the very large circulating current. This heat will often melt the insulation inside the transformer, which […] Read more
