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Electric Power Systems; A Practical Treatment of the Main Conditions, Problems, Facts and Principles in the Installation and Operation of Modern Electric Power Systems, for System Operators, General Electrical Engineers and Students

Electric Power Systems; A Practical Treatment of the Main Conditions, Problems, Facts and Principles in the Installation and Operation of Modern Electric Power Systems, for System Operators, General Electrical Engineers and Students


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 Excerpt: ...the arrester earth-connection should be spaced at least 6 ft. from the earth-connection serving a low voltage circuit. (See Regulations mentioned in Appendix.) It is sometimes stated that earthing electrical systems to water pipes may cause electrolysis by stray currents from the earthed circuits or danger to persons who might have occasion to work on the water pipes. The danger due to electrolysis by alternating current is but a fraction of 1 per cent of the damage done by the same quantity (ampere-hours) of direct current. Danger to persons can easily be avoided by removing the earthed connection when work is to be done on the water pipes, replacing them when the work is completed; but where multiple earth connections are used (not recommended for direct current circuits because of the possibility of electrolytic effects) it is unnecessary to take this precaution. A group of cast-iron pipes driven vertically in a bed of coke, as free from sulphur as possible, give a certain degree of protection. In making the earth connections between the smaller secondary wiring and the station earth-bus, it is common practice to run the earth wires through iron pipes. While this method safeguards the wires from mechanical injury, the iron pipe increases the self-induction of the earth circuit, and to avoid this, all such wires should make metallic contact with both ends of the iron pipe. In the case of small transformers and circuits of limited capacity, this method of earthing affords ample protection. As the kilowatt-capacity of the transformers and circuits increases, it is necessary to provide earth connections of lower resistance. The practical limit of decrease of resistance with driven pipes, oreven buried plates, is soon reached, and for circuits of large capaci...


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Product Details
  • ISBN-13: 9781231156100
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 28
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1231156104
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 68 gr


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Electric Power Systems; A Practical Treatment of the Main Conditions, Problems, Facts and Principles in the Installation and Operation of Modern Electric Power Systems, for System Operators, General Electrical Engineers and Students
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