By G. O. Watson (Auth.)
This 5th version has been completely revised and plenty of of the chapters were rewritten to take account of the drastic and progressive alterations in marine electric perform over the last 20 years. some of the most very important alterations has been the just about whole removing of dc in favour of ac even supposing the previous continues to be utilized in very small ships. In view of this the bankruptcy on dc turbines has been significantly shortened and the gap used to incorporate revised and accelerated fabric on ac turbines, swap equipment, and distribution platforms. The revised bankruptcy on dc turbines will besides the fact that, nonetheless be of curiosity relating to older installations, small ships and for major propulsion (electric) platforms. the topic of electro-magnetic compatibility (ie interference) has been receiving ever-increasing awareness and this applies to marine electric installations in addition to to these that are shore-based. A separate bankruptcy has now been further in this topic which covers attainable circumstances of interference and the way to prevent those by way of cautious making plans of the install. Many advancements have taken position within the manufacture of cables for marine reasons. Rubber, and lead-sheathed cables have now been virtually eradicated in favour of latest varieties of overlaying utilizing clastomeric compounds. as a result of this the bankruptcy on cable install has been thoroughly re-written to incorporate updated details on cabling. fresh years have visible the appearance of the so-called unmanned engine room and likewise the creation of super-tankers. In view of those alterations, the tanker part has been thoroughly re-written by means of Mike Carlisle of Shell Tankers who's a widely known professional in this topic. This bankruptcy now displays the present pondering on electric apparatus put in in tankers from the real safeguard point
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Extra resources for Marine Electrical Practice
If a number of generators are paralleled, each being provided with such a relay, any system overvoltage could result in all the machines being tripped. This can be prevented by allowing a trip to occur only if both over-excitation and an overvoltage are present simultaneously at a particular machine. In this way the machine causing the fault condition will be isolated. g. navigation and communication equipment. Loss of excitation When excitation is lost on a generator the effect on the system will depend on whether it is operating singly or in parallel with other machines.
There is less risk of radio interference, because the excitation thyristors are not connected to the generator output circuit. c. pilot exciter, though the system could be designed to work with any suitable electrical supply. A pilot exciter carries the possible disadvantage of a small increase in overall length. rs). They are completely static, fast in response and, for a given power output, small in size and relatively inexpensive. r. are now almost universally used and generator output voltage can be controlled to within ± 1%.
Fuse. g. when fuses are employed in a back-up mode. When both high- and medium-voltage systems are involved, it will be necessary to plot all the characteristics to a common base voltage. 3 kV, then the characteristics of all the devices used at the higher voltage may be plotted directly. 9 Effect of discrimination of generators in parallel which corresponds to the transformer ratio (because of transformer regulation this will differ slightly from the ratio of the voltage levels). Particular care should be taken when allowing for discrimination between medium- and high-voltage protective devices when a line-to-line fault occurs on the medium-voltage system.