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 effects of high voltage testing on paper insulation.
| Identifier | ExFiles\Box 24\2\ Scan302 | |
| Date | 8th December 1924 | |
| RR 239 (150 BKS.) (D9 461-8-12 24) MP 300975 ROLLS-ROYCE LTD. INSTRUCTIONS. To 19 Order No. PD 39 (2) Customer's No. The applied pressures were between 13,000 and 13,500 volts, but with each paper no readable deflection on the galvanometer was obtained, either at atmospheric temperature or at 100°c. From this result it is concluded that, as regards the secondary winding, one overheating of the coil would not be sufficient to carbonize the paper insulation and so cause a breakdown. The effect of the testing was approximately the same in each case; it being found that the papers were weakened mechanically, but improved electrically, i.e. they were greatly darkened in colour, lost their flexibility and became extremely brittle, but their conductance at over 13,000 volts was zero. Signed C.A.P. This Sheet must be filed on completion of the work. | ||