Rolls-Royce Archives
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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 the electrical properties of windings, including resistance, impedance, and circuit tests.

Identifier  ExFiles\Box 163\7\  img127
Date  10th October 1930 guessed
  
-2-
(1) Continuity of windings :- OK
(2) Quantities :-
Primary resistance 4.15 ohms at 18.5°C.
Ballast " coil designed to work without ballast.
Secondary " 4050 " " 18.5 "
Primary impedance at 50 cycles. 7.32 "
Secondary -ditto- 15500 " " "
Primary inductance .0191 henries
Secondary " 47.5 "
(3) Open circuit test :-
(4) Open secondary circuit primary current :- .72 amperes
Short " " " :- .94 amperes
(5) (a) Secondary resistance after test :- 5960 ohms.
Corresponding temperature :- 139 °C.
Primary current at end of test :- .97 amperes
Ambient temperature :- 20 °C.
(b) Secondary resistance after test :- 6275 ohms.
Corresponding temperature :- 159 °C.
Primary current at end of test :- 1.63 amperes
Ambient temperature :- 21 °C.
Secondary resistance at 0°C. = 3760 ohms.
  
  


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