General Electric Review Volume 12

General Electric Review Volume 12

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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. 1909 edition. Excerpt: ... questions of testing and testing equipment became extremely important with the centralization of practically all of the transformer manufacture, and therefore it was only after a great deal of thought and study that the present layout was decided upon. This study included a review of the apparatus tested in the past and that likely to be tested in the future, together with an examination of the equipments in existence in the various testing departments. The first requisite laid down was absolute safety to life; the second, safety to property; while the third and fourth were accuracy and the providing of an equipment which would enable the maximum amount of work to be turned out with minimum time and labor. The equipment as now installed is entirely nonOcombustible. The floors are of concrete, the framework of piping and angle iron, and the switchboard of slate and marble. All voltages above 500 are considered dangerous and are treated accordingly, by protecting them and keeping them out of reach. In general, the wiring is either on the back of the switchboard and entirely protected by screens or is in conduits underneath the floor. Machine frames, transformer cases, switch boxes, etc., together with the secondaries of the current and potential transformers are grounded; and, by means of metal strips running along the floor, the tanks or cases of all apparatus which is under test are likewise connected to earth. Practically all switches except those for low voltage circuits are of the oil type and are placed back of the board so as to still further reduce danger. The individual testing boards and tables are arranged as closely as possible to the work in hand, so as to make possible the use of short cables leading up from the transformers...show more

Product details

  • Paperback | 244 pages
  • 189 x 246 x 13mm | 440g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236963717
  • 9781236963710