H02H 3/40
Responsive to ratio of voltage and current
Official title: responsive to ratio of voltage and current
H02H3/40 (Responsive to ratio of voltage and current) appears on 198 US grants and 148 published applications in this corpus.
Search patents in H02H- Granted patents
- 198
- Published applications
- 148
- Assignees
- 105
- Inventors
- 393
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 5 | 0 |
| 1983 | 6 | 0 |
| 1984 | 3 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 5 | 0 |
| 1988 | 3 | 0 |
| 1989 | 5 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 3 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 4 | 0 |
| 1998 | 8 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 5 | 1 |
| 2002 | 7 | 3 |
| 2003 | 9 | 8 |
| 2004 | 4 | 5 |
| 2005 | 6 | 4 |
| 2006 | 4 | 2 |
| 2007 | 2 | 2 |
| 2008 | 1 | 3 |
| 2009 | 0 | 4 |
| 2010 | 3 | 6 |
| 2011 | 4 | 8 |
| 2012 | 1 | 6 |
| 2013 | 7 | 6 |
| 2014 | 7 | 7 |
| 2015 | 1 | 1 |
| 2016 | 6 | 4 |
| 2017 | 2 | 4 |
| 2018 | 6 | 6 |
| 2019 | 5 | 8 |
| 2020 | 7 | 8 |
| 2021 | 7 | 7 |
| 2022 | 12 | 11 |
| 2023 | 7 | 12 |
| 2024 | 7 | 4 |
| 2025 | 8 | 13 |
| 2026 | 6 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method and device for insulation monitoring and insulation fault location for unearthed power supply networks26 May 2026US 12,638,488 B2ESA Elektroschaltanlagen Grimma GmbH
- Distance protection of a transmission line12 May 2026US 12,627,135 B2Hitachi Energy Ltd
- Method and system for a pilot directional protection of LCC-HVDC lines based on virtual grounding resistance7 Apr 2026US 12,596,144 B2North China Electric Power University
- Multi-ended impedance-based fault locating for untransposed transmission lines17 Mar 2026US 12,578,374 B2Schweitzer Engineering Laboratories, Inc.
- Method for detecting a series resistance fault in a digital-electricity transmission system3 Mar 2026US 12,566,220 B2VoltServer, Inc.
- A method of detecting a fault in a transmission line in an ac power transmission system20 Aug 2026US 2026/0243814 A1Hitachi Energy Ltd
- A method of detecting a fault in a protected line in a power transmission system9 Apr 2026US 2026/0098888 A1Hitachi Energy Ltd
- Multi-ended impedance-based fault locating for untransposed transmission lines5 Mar 2026US 2026/0063699 A1Schweitzer Engineering Laboratories, Inc.
- Distance protection for an electrical power system based on adapted apparent impedance5 Feb 2026US 2026/0039106 A1Hitachi Energy Ltd
- Vehicle cutoff device8 Jan 2026US 2026/0011999 A1Autonetworks Technologies, Ltd.
Most cited
By later US patents
- Safe exposed conductor power distribution system178US 8,781,637 B2VoltServer, Inc. · 2014
- Protective relay with synchronized phasor measurement capability for use in electric power systems100US 6,662,124 B2Schweitzer Engineering Laboratories, Inc. · 2003
- Protective relay with synchronized phasor measurement capability for use in electric power systems97US 6,845,333 B2Schweitzer Engineering Laboratories, Inc. · 2005
- Sub-cycle digital distance relay92US 5,453,903 AABB Power T&D Company Inc. · 1995
- Recursive estimation in digital distance relaying system89US 4,455,612 AIowa State University Research Foundation, Inc. · 1984