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 comparing the temperature performance of different fuse types and carriers over time.
| Identifier | ExFiles\Box 166\7\ img097 | |
| Date | 18th October 1938 | |
| -2- Time current was on Temperature at junction of carrier and clip of fuse. 1 2 3 4 5 mins. 56°C. 74°C 124°C 85°C 10 mins. 69°C 106°C 120°C 97°C 15 mins. 76°C 96°C 140°C 91°C. It will be seen that fuse (1) has the lowest temperature, while (3) (strip fuse) has the highest combinations (2) and (4) are about equal. As a check, fuse carriers (1) and (3) were interchanged, as also carriers (2) and (4) and the tests repeated with the following results - Time current was on Temperature at junction of carrier and clip of fuse. 1 2 3 4 5 mins. 122°C 97°C 90°C 91°C 10 mins. 120°C 87°C 92°C 78°C 15 mins. 120°C 109°C 102°C 97°C These results show that the strip fuse (now in (1) is still the highest, the heating effects of the strip having outweighed the cooling effect of the steel clip. Also that the experimental carrier with the thicker gauge strip in (4) is the lowest, which suggests that the heavier gauge strip for the carrier is an advantage. Further experimental were carried out in which a round fuse wire was used but flattened at each end, in this way we were able to obtain the increased area of contact at the clip, together with the | ||