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Instructions for Testing Alternating Current Machinery .

Instructions for Testing Alternating Current Machinery .


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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. 1904 edition. Excerpt: ... however, the motor start under the above conditions, as the great majority will, the first test to take is an approximate no-load phase characteristic. This is done by holding normal voltage on the motor and varying the field excitation. This will give a curve as shown in Fig. 28. Beginning with a weak field and reading the amperes armature, increase the field by small steps until the point of minimum input to the armature is found. Then, by increasing the field still further, the amperes armature begin to increase. This is done to determine the field current for minimum input. If the curve is called for in the testing instructions issued from day to day, it should be taken with the belt off. Under these conditions, the watts input at the lowest point of the curve should check very closely with the sum of the core loss, friction, and windage losses, because at this point the power factor is unity on any synchronous motor. With a weak field the current is lagging, and with a strong field it is leading. This feature of a synchronous motor, /. e., being able to produce a leading current, is made use of in a way which will be described later. Having the field current adjusted to give minimum input, we are now ready to take Pulsation Test. Pulsation All synchronous motors are tested for pulsation, which might be caused by line drop, but we do not test for pulsation which might be due to an unsteady source of power. The engine builders have to look out for that point. Synchronous motors, however, have been known to pulsate where the source of power was absolutely constant, but the line drop excessive. We therefore wire in the line a dead resistance, which when full load current is flowing, will give a drop of say 15% of line voltage. Let us...


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Product Details
  • ISBN-13: 9781234364335
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 24
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 1234364336
  • Publisher Date: 22 Jan 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 64 gr


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