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).
Letter from Watson & Sons responding to an enquiry for a high tension transformer for insulation testing.
| Identifier | ExFiles\Box 32\4\ Scan022 | |
| Date | 13th November 1920 | |
| X.1581 WATSON & SONS. 43, Parker Street, Kingsway. TB/HN.{F. C. Honeyman - Retail orders} Your ref. Wd{Mr Wood/Mr Whitehead}/Ms2/FJ. LONDON. W.C. 2. 13th November, 1920. X.1581/ HIGH TENSION TRANSFORMER FOR INSULATION TESTING. Messrs. Rolls-Royce Ltd. Nightingale Road, DERBY. Dear Sirs, We beg to thank you for your enquiry of the 10th instant, in reference to a High Tension Transformer for Insulation Testing, but we regret we cannot at once give you a firm quotation for this apparatus, as not being one of our standards it requires a little going into. We shall be pleased to give you a price in the course of a day or so: meanwhile, we would ask you whether you have any further details with which you could supply us. It would help us to know of what character the insulation testing would be viz:- are the samples to be tested for break-down voltage or for leakage ? Would each test be carried through within a few minutes, or would it necessitate a matter of long continued electric strain lasting an hour or so. Any particulars with which you can supply us in these respects would be helpful in getting out the most efficient design for the purpose. We think in all probability an Oil Immersed Transformer would be desirable. For control we would suggest either a simple series resistance, or a choke would be preferable to a bank of Lamps. If 20,000 volts is the maximum tension required, the 100 to 1 ratio would be quite suitable. We trust we may hear from you in the course of a day or so, when we will with pleasure reply with our quotation. We may say transformers such as these constitute a type of apparatus in which we have had considerable experience, and we shall be pleased to be of service to you in any respect. Assuring you of our best attention at all times, we beg to remain, Yours faithfully, WATSON & SONS (Electro-Medical) LIMITED. | ||