H02H 3/307
Involving comparison of quantities derived from a plurality of phases
Official title: {involving comparison of quantities derived from a plurality of phases, e.g. homopolar quantities; using mixing transformers}
H02H3/307 (Involving comparison of quantities derived from a plurality of phases) appears on 11 US grants and 7 published applications in this corpus.
Search patents in H02H- Granted patents
- 11
- Published applications
- 7
- Assignees
- 12
- Inventors
- 50
- Latest grant
- 19 Sep 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
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| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 2003 | 3 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 2 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 1 |
| 2017 | 1 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 0 |
| 2023 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Differential protection determination method19 Sep 2023US 11,764,568 B2State Grid Corporation of China
- Current source converter differential protection method and relay protection device28 Feb 2017US 9,584,007 B2Nr Electric Co., Ltd
- System, apparatus and method for compensating the sensitivity of a sequence element in a line current differential relay in a power system9 Feb 2010US 7,660,088 B2Schweitzer Engineering Laboratories, Inc.
- Apparatus and method for protecting synchronous generators against off-nominal frequency deviation and alternating forces excitation9 Dec 2003US 6,661,207 B2Siemens Westinghouse Power Corporation
- Line differential protection system for a power transmission line8 Jul 2003US 6,590,397 B2Schweitzer Engineering Laboratories, Inc.
- Differential protection determination method4 Nov 2021US 2021/0344190 A1State Grid Corporation of China
- Current source converter differential protection method and relay protection device28 Apr 2016US 2016/0118877 A1Nr Electric Co., Ltd
- Method of high impedance groundfault detection for differential protection of overhead transmission lines27 Dec 2012US 2012/0330582 A1ALSTOM Technology Ltd
- Fuzzy interference relay and method for current differential protection of a transmission line6 Sep 2012US 2012/0224287 A1ALSTOM Technology Ltd
- System, apparatus and method for compensating the sensitivity of a sequence element in a line current differential relay in a power system29 Mar 2007US 2007/0070565 A1Schweitzer Engineering Laboratories, Inc.
Most cited
By later US patents
- Line differential protection system for a power transmission line66US 6,518,767 B1Schweitzer Engineering Laboratories, Inc. · 2003
- Line differential protection system for a power transmission line49US 6,590,397 B2Schweitzer Engineering Laboratories, Inc. · 2003
- System, apparatus and method for compensating the sensitivity of a sequence element in a line current differential relay in a power system46US 7,660,088 B2Schweitzer Engineering Laboratories, Inc. · 2010
- Delta filter with an adaptive time window for protective relays35US 6,417,791 B1Schweitzer Engineering Laboratories, Inc. · 2002
- Segregated phase comparison system22US 3,963,964 AWestinghouse Electric Corp. · 1976