Switchboards for Power, Light and Railway Service; Direct and Alternating Currents, High and Low Tension

Switchboards for Power, Light and Railway Service; Direct and Alternating Currents, High and Low Tension. William Baxter

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Author: William Baxter
Number of Pages: 44 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130946543
Download Link: Switchboards for Power, Light and Railway Service; Direct and Alternating Currents, High and Low Tension
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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. 1910 Excerpt: ...generated in the secondaries of these transformers will be either in phase or in opposition with the currents from the secondaries of H K, so that they will either help to light Synchronizers. up the lamps, and make them brighter by doubling the e. m. f. or they will extinguish the lamps by neutralizing the e. m. f. Fig. 62 shows the synchronizing arrangements for two three-phase generators, and as the principle of action is the same as in the previous diagrams, an extended explanation will not be necessary. In this diagram it will be noticed that the primaries of the transformers can be connected with the generators below the main switches only. It is not necessary to provide a switch that will connect on either side of the main switch, because the upper connections are only required to ascertain the direction in which the transformer primaries are connected, and this has only to be found out when the switchboard is first tried, or when through some circuit changes doubt may arise as to the actual connection. In all such cases, however, if the upper connection with double throw switches are not provided, temporary connections can be made in any convenient manner. The generators shown in Figs. 57 to 59 are separately excited only, but in almost every case alternators are made so that the field is magnetized in part by a current derived from an independent source and in part by a current derived from the armature, this current being rectified by means of a commutator. The object of this arrangement is to provide means whereby the magnetism of the field may increase as the current increases, so as to maintain the e. m. f. as nearly constant as possible. There are many ways in which the armature and independent currents utilized for magnetizing the field are a...

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