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).
Continued explanation of test results for condensers, detailing the effects of temperature on capacity and leakage.
| Identifier | WestWitteringFiles\K\July1923\ Scan52 | |
| Date | 13th July 1933 | |
| Contd. -2- EFCL/T13.7.33. or otherwise to make it clear, that the portions of the curves corresponding to the higher temperatures represent the combined effect of capacity and leakage. If the leakage current on the test voltage (100 R.M.S. A.C.) is of any appreciable magnitude in relation to the true capacity current, a simple calculation shows that the condenser would not be capable of holding a charge for a long enough time to observe the charge by discharging. Hence, we have on the curves A and B2 points marked L. These represent, before the going up of the curve, the points at which the condensers would cease to hold an observable (by discharging) static charge. On the coming down curves the points L represent the points at which the observable static charge reappeared. In the case of the A curves, the full line curves are the initial rise of capacity with temperature. The dotted line curves are the fall of capacity with temperature, after two cycles of temperature, up and down. They do not represent the final condition that might be obtained. On this same sheet, the two points marked in circles on the 80° curve are the capacity limits given at present on production for that particular temperature, namely .275 to .325 mf. In the first sheet B1 for tests on the B group of condensers, the whole of the observations are graphically recorded. The condensers were taken through the following sequence:- Contd. | ||