Electricity in Agriculture the Uses of Electricity in Arable Pasture Dairy a
Electricity in Agriculture the Uses of Electricity in Arable Pasture Dairy a
Arthur Hinton Allen
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P. , which is often used, cannot be supplied economically at a less pressure than 500 V, and even at this working voltage, a high- pressure line must be run across the fields and connected to the haulage-car through a step-down transformer. The high-pressure line must be tapped at various points, and in order to do this with safety to the workpeople, various ingenious devices may be employed. The transformer truck should be divided into two compartments, to house the high and low pressure appar...atus respectively (see, Fig. 15, p. 37). In the high- pressure side are situated the transformer and circuit- breakers ; in the low-pressure side the fuses, a meter, instrument transformer, low-pressure terminals for the trailing cable, and a drum for the latter. The truck weighs about 3 or 4 tons when loaded, and is arranged for horse traction. The trailing cable, for a three-phase motor, has three cores of 0-04 sq. In. Each, and is provided in lengths of 300 yds. , which can be joined together with male and female connectors ; its life is greatly increased if it is supported clear of the 76 ELECTRICITY IN AGRICULTURE ground, light supports being available for this purpose.
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