From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Calculations and specifications for a laboratory testing transformer.
Identifier | ExFiles\Box 32\4\ Scan057 | |
Date | 5th February 1925 | |
EFC. X1581 5.2.25. LABORATORY TESTING TRANSFORMER. Assumed B = 7,500. Gross C.S. area = 8.75 sq." Nett C.S. area = 7.45 sq." Frequency = 50.7 ~/sec. Since E = (4.44 . Ø . f . T) / 10^8 Turns per volt = T/E = 10^8 / (4.44 x 50.7 x 7500 x 7.45 x 6.45) = 1.23. Take T/E = 1.25 for normal working i.e. 5 turns for 4 volts corresponding to B = 7400. For occasions when the maximum volts per turn are required take T/E = 1.00 corresponding to a B of 9250. HEW. | ||