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).
Test report detailing electrical measurements for windings, including resistance, impedance, and heating tests.
| Identifier | ExFiles\Box 164\5\ img006 | |
| Date | 27th January 1931 guessed | |
| -2- (1) Continuity of windings :- OK. (2) Winding quantities :- Primary resistance 4.57 ohms at 16.5 °C. Ballast " No ballast provided " " " Secondary " 3686 " " 16.5 " Primary impedance at 50 cycles. 8.70 " " Secondary -ditto- 14250. " " Primary inductance .0235 henries Secondary " 43.7 " (3) Open circuit test :- OK (4) Open secondary circuit primary current :- .65 amperes Short " " " :- .88 amperes (5) Preliminary heating tests. (a) Secondary resistance after test :- 4900 ohms Corresponding temperature :- 109 °C. Primary current at end oftest :- .94 amperes. Ambient temperature :- 18.5 °C. (b) Secondary resistance after test :- 5330 ohms. Corresponding temperature :- 139 °C. Primary current at end of test :- 1.63 amperes Ambient temperature :- 18.5 °C. Secondary resistance at 0°C. = 3360 ohms. | ||