Vegetable oil based dielectric coolant
US6037537A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 8, 1996 |
| Grant date | Mar 14, 2000 |
| Priority date | — |
| Expiry date | Oct 8, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F27/321
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A transformer is disclosed, including a tank housing a transformer core/coil assembly, a dielectric insulating fluid surrounding the core/coil assembly, the fluid comprising a vegetable oil, an antioxidant dissolved in the oil, and a low temperature additive blended into the oil, wherein the fluid defines a headspace above the fluid. The preferred embodiment includes an oxygen absorbing material contained in the tank and in contact with gases in the tank but isolated from contact with the dielectric fluid, the tank including an opening and a sealed plug in the opening, such that the oxygen absorbing material can be replaced through the opening upon removal of the sealed plug, and further includes a gas permeable polymer container sealed against the opening for supporting the oxygen absorbing material and an indicator in gas contact with the headspace and visible from outside the tank for indicating the presence of oxygen in the headspace.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.