H02J 3/1878
Using tap changing or phase shifting transformers
Official title: using tap changing or phase shifting transformers
H02J3/1878 (Using tap changing or phase shifting transformers) appears on 150 US grants and 157 published applications in this corpus.
Search patents in H02J- Granted patents
- 150
- Published applications
- 157
- Assignees
- 96
- Inventors
- 378
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 3 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 3 | 2 |
| 2003 | 1 | 1 |
| 2004 | 2 | 1 |
| 2005 | 1 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 1 |
| 2008 | 1 | 6 |
| 2009 | 1 | 5 |
| 2010 | 10 | 9 |
| 2011 | 0 | 5 |
| 2012 | 4 | 9 |
| 2013 | 6 | 16 |
| 2014 | 10 | 8 |
| 2015 | 11 | 6 |
| 2016 | 6 | 7 |
| 2017 | 8 | 4 |
| 2018 | 6 | 7 |
| 2019 | 6 | 6 |
| 2020 | 10 | 17 |
| 2021 | 15 | 6 |
| 2022 | 8 | 11 |
| 2023 | 6 | 6 |
| 2024 | 4 | 10 |
| 2025 | 9 | 7 |
| 2026 | 5 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Power switching system6 Oct 2026US 12,756,192 B2Delta Electronics, Inc.
- Method and device for changing a transformation ratio, an impedance, or a voltage used for excitation6 Oct 2026US 12,756,193 B2Reinhausen GmbH
- Rapid shutdown system and method for controlling the same15 Sep 2026US 12,738,738 B2Sungrow Power Supply Co., Ltd.
- Method of active and reactive power control in ABC frame of a grid-tied converter12 May 2026US 12,627,149 B2Watt & Well
- Power control system for power transmission equipment using solid state switching devices14 Apr 2026US 12,603,500 B2Chevron U.S.A.Inc.
- Power supply tie transformer, and regulation and control method therefor8 Oct 2026US 2026/0312409 A1
- Voltage amplitude and phase adjustment apparatus and method, and computer device and storage medium27 Aug 2026US 2026/0254344 A1
- Method and apparatus for predicting current of load in autotransformer25 Jun 2026US 2026/0177592 A1Hanwha Solutions Corporation
- Dynamic power flow controller (dpfc) for regulating power flow in a power transmission line25 Jun 2026US 2026/0178063 A1
- Hvdc transformer configuration for split pccs30 Apr 2026US 2026/0121416 A1GE Infrastructure Technology LLC
Most cited
By later US patents
- Power factor correction system170US 4,554,502 A1985
- Phase-shifting transformer system54US 5,166,597 AElectric Power Research Institute, Inc. · 1992
- Power factor correction system41US 4,672,298 A1987
- Multiple setpoint configuration in a voltage regulator controller39US 5,552,696 ASiemens Energy & Automation, Inc. · 1996
- Vernier control system for subsynchronous resonance mitigation35US 5,227,713 AElectric Power Research Institute, Inc. · 1993