Proceedings of the Institution of Electrical Engineers (Volume 17)

9780217035361: Proceedings of the Institution of Electrical Engineers (Volume 17)

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. 1889 edition. Excerpt: ...current is enormous, and is much greater than 300 amperes, and it would be impossible to put a conductor carrying that current--a single conductor--overhead. The potential which Mr. Crompton uses, of 480 volts, is a potential which is not allowed to us in this country, and the current which he is carrying in the charging mains is I,500amp6res. He uses wires whose sectional area is 2'55 inches, and you cannot have wires of that size swung all the way overhead. Such massive conductors must be put underground; and still more would it be necessary if a system complying with the Board of Trade regulations were adopted. Consequently I reduce Mr. Crompton's estimate for the mains in the alternating system in this case to £6,000, and thus the total cost of the alternating system is laid down for the supposed central station which he has proposed at £39,140, instead of £57,440; and thus we have the comparison between the accumulator and transformer distribution systems. The cost of the former, assuming that he is correct, is £59,762; and the transformer system is £39,140. Having pointed out now the sources of error in this paper when dealing witli the VOL. XVII. 30 Professor alternate-current system. I will now point out one source of Forbes. J eiTor in connection with the accumulator system which is sufficient to throw doubts on the accuracy of these results. I speak of the efficiency of the accumulators. You will find that he tells us, near the end of the paper, what is the efficiency of the whole system--that is to say, the combined efficiency of the conductor system and of the accumulators. He says: "For an output of 2,100 units, it will be sufficient to work "the generating plant for about five hours at approximately...

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