The maintenance requirements for cage-rotor induction motors are very simple: contact resistance low Keep insulation resistance high and Lubricate correctly and maintain a uniform air gap Ensure both the interior and exterior are always clean and dry Provided these requirements are met, an induction motor should give trouble- free service during its long life. The […] Read more
Ship’s Motor Enclosures Enclosure protection for electrical equipment is defined in terms of its opposition to the ingress of solid particles and liquids. The enclosure protection is defined by the Ingress Protection (lP) Code where a two figure number is used to indicate the degree of protection against the ingress of solids and liquids. Drip-proof […] Read more
While at anchor the vessel’s fire alarm sounded on one of the lower decks. The OOW sent the duty seaman down to investigate. The crew member found a deck-head fluorescent light releasing smoke. The appropriate circuit breakers were closed and the light was smothered, extinguishing the nascent fire. The company investigation found that a poor […] Read more
These are used as an accessory for large contactors and are connected through control circuits where they are used for monitoring purposes. Side-mounted contact reference numbers, representing NO and NC contacts, are defined as previously explained. Two position numbers adjacent to each contact terminal. Modules can be from either side of the contactor on ship […] Read more
Dry-type transformers are a part of most electrical installations. They range in size from small doorbell transformers to three-phase 25-kVA units ins... 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
What need for job IT TECHNICAL OFFICER (AZURE/AD/POWERSHELL) – Manage ADFS infrastructure and handle upgrades, integration and fe... Read more
Color coding allows the Electrical engineer ETO to follow electrical circuits throughout a vessel without having to physically touch each cable. The c... Read more
AV/IT Officer AV/IT Officer for very large New Build in Europe – €8.000/month. 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
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
Azimuth thrusters are thrusters that can be rotated in order to produce thrust in any direction. The thrust is controlled either by constant speed and CPP design, variable speed FPP design, or in rare cases with a combination of speed and pitch control. Variable -speed FPP designs has a significantly simpler mechanical underwater construction with […] Read more
Circuit breakers require careful inspection and cleaning at least once a year. Before working on circuit breakers, check the applicable technical manual carefully. Before working on shipboard circuit breakers, obtain the approval of the electrical officer. Be certain to remove all power to the circuit breaker before working on it. Tag the switch that removes […] Read more
Electronic diodes, and other semi-conductor devices with p-n junctions (e.g. the base-emitter of a transistor) can be tested using a digital type instrument using the following procedure: PROVE the correct instrument operation. SWITCH the instrument to diode test. If the diode is still in circuit, turn off the power to the circuit, Discharge all capacitors […] Read more
Manned engine-rooms are rare nowadays. Modern automation systems such as remote control and alarm and monitoring systems make it possible to operate most engine-rooms unmanned, at least part of the time. In day-time engineers can execute planned maintenance and repairs or replacement of defective parts. Because engine-rooms are usually warm, damp and noisy, an un-manned […] 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
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
When equipment is regularly inspected and maintained according to a manufacturer’s timetable and described procedures that specify the actual work to be done to prevent equipment failure.Planned maintenance is carried out at fixed regular intervals, whether the equipment needs it or not. The aim is to prevent breakdown and this type of maintenance has the […] Read more
Ship distribution system The main elements of a marine distribution system are the main and emergency switchboards, power panels / boards, motor controllers, lighting and small power panels / boards. The system is generally designed such that under all normal conditions of operation, power is distributed from the main switchboard. The distribution system is designed to […] Read more
