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Power Wiring Diagrams; A Handbook of Connection Diagrams of Control and Protective Systems for Industrial Plants

Power Wiring Diagrams; A Handbook of Connection Diagrams of Control and Protective Systems for Industrial Plants


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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. 1917 Excerpt: ...accelerating contactors is controlled. The control of the motor is effected by means of push buttons, a pilot switch, a float switch or a pressure regulator (or governor). With motors having wound rotors the current limiting relays may be connected either in stator or rotor circuit, but with motors having squirrel cage rotors the relay must be connected in the stator circuit. Motors having squirrel-cage rotors are started with reduced voltage, which is obtained either by series resistance or from an auto transformer. Two contactors are necessary: one connects the motor to the starting rheostat (or auto-transformer) and the other, which is controlled by the current-limiting relay, connects the motor directly to the. line. Only one starting point is required because, with normal designs of motors, any voltage which will start the motor will accelerate it to nearly synchronous speed. The method in which an autotransformer is used is preferable to that in which a rheostat is used since, for equal starting torques, the line current will be lower. The voltage impressed on motor at starting should be such that the starting operation occupies from 4 to 8 seconds. If the starting period is much less than 4 seconds a lower voltage can be used: while, if the period is greater than 8 seconds, a higher voltage is necessary. Motors having wound rotors are started by inserting resistances in the rotor circuit, the sections being cut out by contactors controlled by current-limiting relays. The number of sections depends on the size of motor and the nature of the load against which the motor has to start. The contactor and resistance sections are so arranged that all phases of the rotor are balanced during starting (see Figs. 107, 108). Alternating-current contactors are sh...


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Product Details
  • ISBN-13: 9781236052728
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 30
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1236052722
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 73 gr


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Power Wiring Diagrams; A Handbook of Connection Diagrams of Control and Protective Systems for Industrial Plants
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