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).
The performance of regulators and cutouts, detailing test results and proposed modifications.
| Identifier | ExFiles\Box 166\2\ img124 | |
| Date | 27th October 1937 guessed | |
| -3- 15 volts, the load taken through A1 is very small (about 1.5 amperes) we must consider what load is being taken through terminal A.{Mr Adams} More so, as we assume this constitutes the current that is going into a battery that is already fully charged. We therefore, specify, based on the above figures, as follows:- With 15 volts on the shunt terminals, and 1.5 amperes constant taken from terminal A1, the regulating current through terminal 'A' will be:- 1.0 to 6.0 amperes (cold) 3.5 to 9.0 amperes (hot) Actually under these conditions, the regulators gave on the average:- Without compensation ( 6.3 to 8.9 amperes. (cold) (15.4 to 12.5 amperes. (hot) With compensation (11.0 to 10.2 amperes. (cold) ( 8.1 to 8.8 amperes. (hot) The cutout is subject to the same trouble as the following figures will show Average operating Voltage Cold. 12.3 Volts. " " Hot. 17.3 Volts. Figures for an R.R. 'cutout' tested under the same conditions were:- Operating Voltage Cold. 12.8 Volts. " " Hot. 14.8 Volts. Of the two units which we understood would have compensation on the cutouts, only one, No. LT.1333-2, appears to be so fitted. This dropped from 12.3 cold, to 11.9 volts hot. We suggest that the trouble is largely due to internal heating of the shunt winding. It is therefore proposed, for your consideration, that you take the two thermostatic LR.{Mr Ellor}7.T units and modify them as follows:- (1) From both, remove the bi-metal hinge spring, and fit an ordinary steel or phosphor bronze spring. (2) On one of the units, in addition to removing the temperature compensation, to alter the tapping arrangement of the series | ||