This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 edition. Excerpt: ... and Fresno, Cal., are operated at from 10,000 to 11,000 volts. This means that the line copper required is less than one per cent of that which would be needed for direct feeding of the motors at the same percentage of loss. For railway work in distributing power to substations nothing less than 5000 ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 edition. Excerpt: ... and Fresno, Cal., are operated at from 10,000 to 11,000 volts. This means that the line copper required is less than one per cent of that which would be needed for direct feeding of the motors at the same percentage of loss. For railway work in distributing power to substations nothing less than 5000 volts is likely to be used and 10,000 will be frequent. At distances at which substation working becomes economical less than 5000 volts will hardly pay. We have already seen in the preceding chapter that on anything less than a fifteen or twenty mile road, transmission to sub-stations is not likely to compete advantageously with the ordinary device of separate stations. At such distances 10,000 volts is to be recommended as a standard pressure. The problem of getting such voltages is not altogether simple. The most usual method is to generate the power at a rather moderate voltage, say, 500 or 1000, and then to obtain the high line pressure from raising transformers. For voltages of 10,000 and upwards this is by far the best plan, and so indeed it is generally for 5000 volts, but for pressures up to the last mentioned figure and even above it, there is a strong tendency to construct special high voltage dynamos feeding directly into the line. This avoids the cost of the raising transformers and the loss of energy incurred in them. On the other hand such high voltage dynamos are rather difficult and expensive to construct and somewhat more liable to deterioration than those of lower voltage. While it is possible to wind alternators in the ordinary manner for pressures of 5000 volts or so, the thorough insulation of the moving armature becomes a very difficult matter. Under these circumstances it is far better to design the generator in such...
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Add this copy of Power Distribution for Electric Railroads to cart. $46.70, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2010 by Kessinger Publishing.
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