|
American Railway Signaling Principles and Practices Transformers Chap 8 1928
American Railway Signaling Principles and Practices Transformers
Approx 40 pages
Copyright 1928
A transformer is defined as a form of stationary induction apparatus in which the primary and secondary windings are ordinarily insulated one from another. A transformer does not generate power, but merely changes the power from one voltage to another.
Alternating current for signaling is generally transmitted from a power station to the signal field by high-voltage mains; 2200 to 6600 volts are in general use, although higher and lower voltages are sometimes employed. The high voltages on mains are changed to lower voltages by means of transformers.
One method to lower the voltage is by two successive steps, that is, to use a line transformer to lower the voltage to 55 volts or 110 volts for signal motors, etc., and then further reduce this voltage by using a transformer to feed the track circuits and low-voltage signal lamps.
Another method is to use only one transformer to lower the voltage for all purposes.
In theory and in general construction all transformers, whether line or track, are the same and this chapter will deal principally with signal transformers.
All pictures are of the actual item. There may be reflection from the lights in some photos. We try to take photos of any damage. If this is a railroad item, this material is obsolete and no longer in use by the railroad. Please email with questions. Publishers of Train Shed Cyclopedias and Stephans Railroad Directories. Large inventory of railroad books and magazines. Thank you for buying from us.
Shipping charges
US Shipments: When you add multiple items to your cart, the reduced shipping charges will automatically be calculated. For direct postage rates to other countries, send me an email. Shipping varies by weight.
Terms and conditions
All sales are final. Returns accepted if item is not as described. Contact us before making a return. No warranty is stated or implied. Please e-mail us with any questions before bidding or buying.
Thanks for looking at our items.
| 
