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 4
... heating of the conductors , which may destroy the insulation or give rise to danger of fire . Each of these effects will be considered separately later . The determination of electrical resistance can easily be made either by ...
... heating of the conductors , which may destroy the insulation or give rise to danger of fire . Each of these effects will be considered separately later . The determination of electrical resistance can easily be made either by ...
Сторінка 7
... heating limit allowed in electrical machin- ery , the results obtained from Equation 6 are three - quarters of one per cent less than those of Matthiessen . This expression is therefore sufficiently accurate for almost any practical ...
... heating limit allowed in electrical machin- ery , the results obtained from Equation 6 are three - quarters of one per cent less than those of Matthiessen . This expression is therefore sufficiently accurate for almost any practical ...
Сторінка 9
... heat wires more than 5 or 10 degrees , the loss of voltage being usually the controlling factor . Under the head of current capacity the rise in temperature of the various kinds of conductors will be discussed later . In any given case ...
... heat wires more than 5 or 10 degrees , the loss of voltage being usually the controlling factor . Under the head of current capacity the rise in temperature of the various kinds of conductors will be discussed later . In any given case ...
Сторінка 10
... heat units , any of the above values may be multiplied by .24 for calories ( gram - degree cent . ) , or by .00095 ... heating limit , which will be discussed later , are usually of more consequence than the mere waste of a small ...
... heat units , any of the above values may be multiplied by .24 for calories ( gram - degree cent . ) , or by .00095 ... heating limit , which will be discussed later , are usually of more consequence than the mere waste of a small ...
Сторінка 13
... heating which it causes . The production of heat in an electrical conduc- tor has already been stated in terms of the various quantities in- volved . This heat is an absolutely definite and unavoidable result of the flow of the current ...
... heating which it causes . The production of heat in an electrical conduc- tor has already been stated in terms of the various quantities in- volved . This heat is an absolutely definite and unavoidable result of the flow of the current ...
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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.