If one phase is short-circuited to ground, there will flow a ground fault current. Its magnitude depends heavily onthe method of system grounding, which are: UngroundedGround fault currents will still flow due to capacitive coupling between healthy phases and ground, typically in the order of a few amps in a ship installation. Low resistance groundingGround […] 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
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
The mechanical interlock is assembled between two contactors to prevent them from simultaneously closing and is often used as an added safety feature to electrically interlocked contactors. Even with a mechanical force against the magnetic system, the contacts of both contactors cannot close simultaneously. An electrical interlock consists of two interlinked auxiliary NC contacts. While […] Read more
Sometimes referred to as an electrician, ETO’s are generally employed on ship or yacht, where the engineering staff comprises of roughly four or five... Read more
The megohmmeter (commonly called a megger in the field) is used to measure the resistance of insulation in megohms (thousands of ohms). Test re... 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... Read more
Modern advanced technology is key to enhancing the experience and safety on mega boats or superyacht, so the maintenance of the electrical equipment i... Read more
We are looking for Ukrainian ETO to join Self-Unloading Bulker Requirements: at least 3 contracts a... 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
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
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
Ship protection and monitoring relays ensure safety and a high level of ship electrical system availability by monitoring electrical power (voltage, current, and frequency).An important function of ship monitoring relays is early error detection. This makes it possible to respond to irregularities before it is necessary to switch off part or all of a ship’s […] Read more
Intermittent Faults on ship electrical system When ships Electrical Engineer ETO need find and diagnose intermittent faults, where a short, open, or other problem occurs only temporarily, or only under certain conditions, is always a difficult troubleshooting problem. Two features found on most DMMs can help with identifying intermittent faults. Continuity capture mode This feature […] Read more
What does an electro technical officer do? An electro technical officer handles several responsibilities on vessel mainly related to electrical systems. Like most jobs at sea, as a ship officer handling electronics on a vessel, you are most likely to work under a chief engineer who supervises everything on a ship. And while under a […] 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
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
Block diagrams represent the main arrangements and inter relationships between either different systems or different modules within one system. They create a general overview of the entire plant. Units within a plant, shown in blocks, are connected by cables with their corresponding ship cable numbers voltage and number of cores. Block references consist of: unit […] Read more
Ideally insulation resistance measurement on ship electrical machine is while the machine is hot? Insulation becomes more leaky (its IR value falls) at high temperatures. So testing while hot shows the realistic IR value at, or near, its working temperature. Insulation resistance can vary considerably with changing atmospheric conditions. A single reading gives little information. […] Read more
