Method for producing transformers, especially transformers for distribution systems, and a device for carrying out this method
US5424513A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1992 |
| Grant date | Jun 13, 1995 |
| Priority date | — |
| Expiry date | Nov 12, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F27/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The method and the device for carrying out the method are used for producing transformers (27, 28, 29) which are filled with insulating means, especially transformers for distribution systems. In the case of the method, solid insulation of the transformers is dried in the device before addition of an insulating means, in that the low-voltage windings are short-circuited in every transformer, and the parallel-connected high-voltage windings (30, 31, 32) are heated by means of a low-frequency AC current. In this case, the mean temperature of the windings of the transformers is determined at the same time by measuring the low-frequency AC current, in order thus to make it possible to dry the solid insulation well. In carrying out the method, the mean temperature of the high-voltage windings (for example 31) of each transformer (for example 28) is determined independently of the mean temperature of the windings of each transformer, preferably additionally, by means of a resistance measuring apparatus (14) which is connected in series with the at least one part of the high-voltage windings (for example 31). As a result of suitable guidance of the low-frequency AC current and/or switchin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.