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 |
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Сторінка 24
... load may be placed on a single loop , in which case the arrangement reduces to the ordinary one shown in Fig . 3 . When the number of lamps on any loop is augmented or diminished , the potential difference between its terminals varies ...
... load may be placed on a single loop , in which case the arrangement reduces to the ordinary one shown in Fig . 3 . When the number of lamps on any loop is augmented or diminished , the potential difference between its terminals varies ...
Сторінка 47
... load ; that is , when the maximum number of lamps are lighted . In fact , the circuits should be care- fully designed to approximate this condition as closely as practica- ble in most cases . When only a fraction of the lamps are turned ...
... load ; that is , when the maximum number of lamps are lighted . In fact , the circuits should be care- fully designed to approximate this condition as closely as practica- ble in most cases . When only a fraction of the lamps are turned ...
Сторінка 48
... load conditions represented in the diagram . Similar reasoning is applicable to the arrangements shown in Figs . 17 and 18 ; in fact , any two groups of lamps would have the same pressure in the case of the former , and any number less ...
... load conditions represented in the diagram . Similar reasoning is applicable to the arrangements shown in Figs . 17 and 18 ; in fact , any two groups of lamps would have the same pressure in the case of the former , and any number less ...
Сторінка 49
... load less than the full amount . The substitution of tapering mains for cylindrical ones makes the pressure still more uniform for fractional loads , since the drop is more nearly equal for the different portions of the conductors ...
... load less than the full amount . The substitution of tapering mains for cylindrical ones makes the pressure still more uniform for fractional loads , since the drop is more nearly equal for the different portions of the conductors ...
Сторінка 51
... load , since the total or average drop , and the greatest difference in voltage between lamps , will almost always be smaller for any number or arrangement of lamps less than the maximum load . Heretofore the principal point that has ...
... load , since the total or average drop , and the greatest difference in voltage between lamps , will almost always be smaller for any number or arrangement of lamps less than the maximum load . Heretofore the principal point that has ...
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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
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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.