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 29
... voltage over a large district is exceedingly difficult . The " drop The " drop " or loss of voltage , due to the resistance of conductors , which has already been discussed on page 9 , is particularly objectionable in incandescent ...
... voltage over a large district is exceedingly difficult . The " drop The " drop " or loss of voltage , due to the resistance of conductors , which has already been discussed on page 9 , is particularly objectionable in incandescent ...
Сторінка 34
... voltage than those at the ends , as shown in the diagram . This is due to the fact that the former are supplied through the portions of the main conductors which carry heavy currents , and in which the drop is greatest . For example ...
... voltage than those at the ends , as shown in the diagram . This is due to the fact that the former are supplied through the portions of the main conductors which carry heavy currents , and in which the drop is greatest . For example ...
Сторінка 35
... voltage at the feeding - points of the mains is disadvantageous in two respects . First , it involves a loss of power in watts equal to the extra pressure multiplied by the total current ; and second , it may allow great variations in ...
... voltage at the feeding - points of the mains is disadvantageous in two respects . First , it involves a loss of power in watts equal to the extra pressure multiplied by the total current ; and second , it may allow great variations in ...
Сторінка 36
... voltage , 1,600 feet of No. 10 wire , weighing only 50 lbs . , being required . This exact equality in voltage is due to this being a special case , in which the lamps happen to be symmetrically placed with respect to the feed- ing ...
... voltage , 1,600 feet of No. 10 wire , weighing only 50 lbs . , being required . This exact equality in voltage is due to this being a special case , in which the lamps happen to be symmetrically placed with respect to the feed- ing ...
Сторінка 37
... Voltage Between Lamps ; 115 Volts Between Feeding - Points ; 5 Volts Drop . In answer is to be found in the fact that the groups of lamps in Fig . 21 are not only equal in potential when all are burning , but they are also independent ...
... Voltage Between Lamps ; 115 Volts Between Feeding - Points ; 5 Volts Drop . In answer is to be found in the fact that the groups of lamps in Fig . 21 are not only equal in potential when all are burning , but they are also independent ...
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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
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.