Test setup and results for determining the electric strength and temperature rise of fibrous insulating materials under A.C. voltage stress.
| Identifier | ExFiles\Box 24\2\ Scan225 | |
| Date | 21th February 1922 guessed | |
| FIBROUS INSULATING MATERIALS. 801 VARIABLE A.C. SUPPLY HIGH RESISTANCE EARTH SHORT C'T'G SWITCH 52 VOLT BATTERY THERMOMETER COLD JUNCTION SPECIMEN 5" X 4 1/2" EUREKA COPPER TINFOIL 4" x 3 1/2" WEIGHT 6.2 lb. THERMO JUNCTION (a)= 1/2" COARSE FELT 4 3/4" x 4 3/4" Fig. 9.—Connections for ascertaining the electric strength when the material is subjected to long applications of voltage. NOTE: a, b, c, d, e & f represent the A.C. voltage stresses applied for the time interval between their respective arrow heads. A.C. VOLTS PER MIL Temperature Rise Leakage Current Temperature Rise °C Leakage Current microamps Time : Hours Fig. 10.—Showing method of expressing the results of the test illustrated in Fig. 9. | ||
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).