Electric Lighting: A Practical Exposition of the Art, for the Use of Engineers, Students, and Others Interested in the Installation Or Operation of Electrical Plants, Том 2D. Van Nostrand Company, 1901 |
З цієї книги
Результати 11-15 із 100
Сторінка 65
... similar to that shown in Fig . 37 , but hav- ing a transfer ' bus bar P in addition to the main and auxiliary bars F and E. The latter is connected to the resistance coils of a rheostat , the movable arm of which is connected to the ...
... similar to that shown in Fig . 37 , but hav- ing a transfer ' bus bar P in addition to the main and auxiliary bars F and E. The latter is connected to the resistance coils of a rheostat , the movable arm of which is connected to the ...
Сторінка 67
... similar to that of compound - wound dynamos ; but it acts upon the feeders individually , instead of upon the system as a whole . It corresponds to a case where each feeder is supplied by its own compound generator , which is a possible ...
... similar to that of compound - wound dynamos ; but it acts upon the feeders individually , instead of upon the system as a whole . It corresponds to a case where each feeder is supplied by its own compound generator , which is a possible ...
Сторінка 68
... Similar machines are sometimes used to reduce or " crush " the voltage instead of raising it , in which case the main dynamo may be run at the average pressure required by the feeders , the poten- tial in those that are heavily loaded ...
... Similar machines are sometimes used to reduce or " crush " the voltage instead of raising it , in which case the main dynamo may be run at the average pressure required by the feeders , the poten- tial in those that are heavily loaded ...
Сторінка 86
... similar to the three - wire system illustrated in Fig . 56 , only one main dynamo , D , being required ; and the total pressure generated by it , ordinarily about 440 volts , is subdivided by the four small equalizing machines or ...
... similar to the three - wire system illustrated in Fig . 56 , only one main dynamo , D , being required ; and the total pressure generated by it , ordinarily about 440 volts , is subdivided by the four small equalizing machines or ...
Сторінка 87
... similar to that used in connection with the three - wire diagrams ( Figs . 47 and 48 ) . But it can be arrived at more simply by considering that the current in each of the outside wires of a perfectly balanced five - wire sys- tem is ...
... similar to that used in connection with the three - wire diagrams ( Figs . 47 and 48 ) . But it can be arrived at more simply by considering that the current in each of the outside wires of a perfectly balanced five - wire sys- tem is ...
Інші видання - Показати все
Electric Lighting: A Practical Exposition of the Art, for the Use of ... Francis Bacon Crocker Попередній перегляд недоступний - 2016 |
Загальні терміни та фрази
alternating current amperes apparatus arc lamps armature arrangement bulb bus bars cable candle-power capacity carbon cent circular mils conductors conduit connected constant current constant potential copper loss core cross-arm cross-section cut-out device diameter difference direct current distribution drop dynamo effect efficiency electric lighting electrical conductors employed energy equal fact feeders feeding-points filament flow frequency full load fuse globe ground heat hence incandescent lamps inch inclosed arc increase inductance insulation iron joint latter length less machines magnetic maximum mechanical metal meter method motor number of lamps ohms one-half open arc operation ordinary parallel phase pipe placed pole polyphase porcelain practically pressure primary produced reactance regulation represented in Fig resistance rheostat rotary rotary converters secondary circuit shown in Fig shunt side single-phase socket supplied switch temperature terminal three-phase three-wire system tion transformers tube two-phase two-wire two-wire circuit usually voltage volts wattmeter watts winding
Популярні уривки
Сторінка 460 - The lower limit is specified for rubber-covered wires to prevent gradual deterioration of the high insulations by the heat of the wires, but not from fear of igniting the insulation. The question of drop is not taken into consideration in the above tables.
Сторінка 11 - W, we find that the most economical area of conductor is that for which the annual cost of energy wasted is equal to the annual interest on that portion of the capital outlay which can be considered to be proportional to the weight of metal used. Professor George Forbes, in his Cantor Lecture, on " The Distribution of Electricity...
Сторінка 459 - Must be so placed in wet places that an air space will be left between conductors and pipes in crossing, and the former must be run in such a way that they cannot come in contact with the pipe accidentally. Wires should be run over, rather than under, pipes upon which moisture is likely to gather or which, by leaking, might cause trouble on a circuit.