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).
Condenser performance tests, analyzing apparent capacity and leakage at different temperatures.
| Identifier | ExFiles\Box 52\3\ Scan137 | |
| Date | 29th October 1923 | |
| Contd. -2- EFC {E. Fowler Clarke - Electrical Engineer} 3/T29.10.23. long as leakage is absent, but only apparent capacities at points on the curves above the points marked L, i.e. roughly speaking above temperatures of about 45ºC. Above this temperature each curve shows the apparent capacity, whose magnitude is the combined result of reall capacity and leakage. The actual points L are the points at which the condenser ceases to hold an observable (by discharging) static charge. So long as a condenser can exhibit a static charge a simple calculation shows that its leakage current would not be of appreciable magnitude in relation to its true capacity current, so even above the points L the curves would not differ materially from the true capacity, until they present an obvious bias in the upward direction. The capacity limits for the standard condensers given in our specification of production test for temperatures of 18ºC and 45ºC are indicated by circles. The first group of condensers, viz. Nos. 31, 32, 741 and the one from the Liberty ignition, were taken through the following sequence:- (a) The temp. was raised gradually to 40ºC, during which observations were taken, after which it was allowed to fall to normal. (b) The temp. was raised gradually from normal to 55ºC, observations being taken, after which it was again allowed to fall to normal. (c) The temp. was again raised gradually to 55ºC, observations being taken, after which it was again allowed to fall to normal. It was intended this time that the temp.should go to 70ºC but circumstances prevented this. Contd. | ||