The majority of new buildings and all commercial vessels have an AC power generation plant with AC distribution. The generators are synchronous machines, with a magnetizing winding on the rotor carrying a DC current, and a three-phase stator winding where the magnetic field from the rotor current induces a three-phase sinusoidal voltage when the rotor […] Read more
What are some general safety tips for working with or near electricity? Inspect portable cord-and-plug connected equipment, extension cords, power bars, and electrical fittings for damage or wear before each use. Repair or replace damaged equipment immediately. Always tape extension cords to walls or floors when necessary. Nails and staples can damage extension cords causing […] Read more
Primary Essential Services are those which need to be in continuous operation for maintaining propulsion and steering. Some of them are as follows: 1) Steering gears. 2) Pumps for controllable pitch propellers. 3) Scavenging air blower, fuel oil supply pumps, fuel valve cooling pumps, lubricating oil pumps and cooling water pumps for main and auxiliary […] Read more
In any isolated power system, the amount of generated power must be equal to the consumed power including losses. For an electric system consisting of an electric power generation plant, a distribution system, including distribution transformers and a variable speed drive, the power flow can be is: The prime movers, e.g. diesel engines or gas […] Read more
Ship’s large power equipment and processes utilise high forces. Electrical, mechanical, thermal and chemical changes produce the desired operation. Ve... Read more
Marine electricians are responsible for installing and maintaining electrical systems and/or equipment on ships and boats. They typically work at sea... Read more
For each generator circuit breaker must be fitted with an overcurrent relay. On medium-voltage systems this is often an integral part of the circuit b... Read more
A vessel has an extensive electrical system designed to carry out more functions than can be found in a small community. Lighting, instrument panels,... Read more
We currently working on various ETO vacancies. Positions are available for junior and senior ETO... Read more
The dynamic requirements for the frequency converters in propulsion application are low, compared to many other industrial applications. Electric Propulsion on Icebreakers and Ice Going Vessels But in ice-going vessels and icebreakers, the load variations may be significant and rapid, and this implies that the propulsion system must have high dynamic performance in order to […] Read more
The performance of electric lamps will deteriorate with time. Eventually they fail and the lamps must be replaced. Simple lamp replacement becomes the most obvious maintenance task. When a luminaire fails to light-up when switched on, it is natural to suspect lamp failure. If this does not solve the problem, checks on the lamp control […] Read more
When ship electrical equipment is regularly monitored and tested. Then monitoring indicates that a breakdown is imminent, the equipment is repaired or replaced and any other specified maintenance procedures are carried out. Regular insulation testing and vibration testing are two forms of condition monitoring.Condition monitoring is also carried out at fixed regular intervals. The aim […] 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
Hand-held test meters should never be connected to any electrical equipment or system operating at a voltage that exceeds the meter’s rating. While this is an important safety precaution when using any meter, it is even more important with DMMs. Digital meters are more sensitive than older analog models to transient over voltages caused by utility […] Read more
The power rating of an emergency generator is determined by the size and role of the ship. On some small vessels a few kW will suffice for emergency lighting only. Larger and more complicated vessels, e.g. LPG carriers, passenger liners, etc., may require hundreds of kW for emergency lighting, re-starting of the main engine auxiliaries […] 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
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
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 fuse is a piece of wire which can carry a stated current; if the current rises above this value it will melt. If the fuse melts (blows) then there is an open circuit and no current can then flow – thus protecting the equipment by isolating it from the power supply. The fuse must […] Read more
Lockout/tagout energy sources When electrical systems are de-energized to perform maintenance work safely, precautions must be taken to insure that circuits are not accidentally turned back on while the work is going on. Lockout/tagout is the preferred method of controlling energy sources to minimize hazards to personnel. The details are complex, Every company should […] Read more
