H01F 2027/328
Dry-type transformer with encapsulated foil winding
Official title: {Dry-type transformer with encapsulated foil winding, e.g. windings coaxially arranged on core legs with spacers for cooling and with three phases}
H01F2027/328 (Dry-type transformer with encapsulated foil winding) appears on 83 US grants and 57 published applications in this corpus.
Search patents in H01F- Granted patents
- 83
- Published applications
- 57
- Assignees
- 36
- Inventors
- 184
- Latest grant
- 30 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 6 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 4 | 0 |
| 2001 | 0 | 0 |
| 2002 | 2 | 0 |
| 2003 | 1 | 1 |
| 2004 | 1 | 2 |
| 2005 | 0 | 0 |
| 2006 | 1 | 1 |
| 2007 | 1 | 2 |
| 2008 | 1 | 3 |
| 2009 | 1 | 1 |
| 2010 | 4 | 3 |
| 2011 | 4 | 4 |
| 2012 | 1 | 1 |
| 2013 | 0 | 6 |
| 2014 | 3 | 4 |
| 2015 | 3 | 2 |
| 2016 | 5 | 1 |
| 2017 | 2 | 1 |
| 2018 | 0 | 3 |
| 2019 | 2 | 2 |
| 2020 | 2 | 4 |
| 2021 | 3 | 7 |
| 2022 | 4 | 5 |
| 2023 | 1 | 1 |
| 2024 | 3 | 2 |
| 2025 | 4 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Casting dry-type transformer and manufacturing method thereof30 Jun 2026US 12,671,026 B2Haihong Electric Co., Ltd.
- Transformer cooling system19 Aug 2025US 12,394,550 B2Hitachi Energy Ltd
- Dry transformer19 Aug 2025US 12,394,562 B2Hitachi Energy Ltd
- Transformer and transformer machining process5 Aug 2025US 12,381,034 B2Sungrow Power Supply Co., Ltd.
- 110 kV three-phase dry-type transformer and assembly method therefor24 Jun 2025US 12,340,938 B2Jiangsu Huapeng Transformer Co., Ltd.
- Method for producing spacers for a winding unit and voltage-resistant spacers for cast resin transformers13 Feb 2025US 2025/0054690 A1Siemens Energy Global GmbH & Co. KG
- Transformer installation6 Jun 2024US 2024/0186051 A1Hitachi Energy Ltd
- Transformer with air-flow re-director4 Jan 2024US 2024/0006111 A1Hitachi Energy Switzerland AG
- Casting dry-type transformer and manufacturing method thereof26 Oct 2023US 2023/0343511 A1Haihong Electric Co., Ltd.
- Transformer frame structure13 Oct 2022US 2022/0328231 A1Hitachi Energy Switzerland AG
Most cited
By later US patents
- High-voltage winding for core-form power transformers44US 4,864,266 AElectric Power Research Institute, Inc. · 1989
- Process for manufacturing a polymeric encapsulated transformer34US 5,036,580 AE. I. Du Pont de Nemours and Company · 1991
- Single phase dry-type transformer31US 5,621,372 ASquare D Company · 1997
- Dry-type transformer and method of manufacturing28US 5,396,210 ASquare D Company · 1995
- Transformer cooling method and apparatus therefor28US 6,157,282 ASquare D Company · 2000