Issued Patents All Time
Showing 1–25 of 25 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11996688 | Method of controlled switching for transformers using transformer residual flux | Ritwik Chowdhury | 2024-05-28 |
| 11575253 | Controlled three-pole close for transmission lines | Ritwik Chowdhury, Carolyn Sun | 2023-02-07 |
| 11476655 | Trapped charge estimation | Ritwik Chowdhury, Carolyn Sun | 2022-10-18 |
| 11346878 | Fault location during pole-open condition | Brian A. Smyth | 2022-05-31 |
| 11233389 | Controlled three-pole close for transformers | Ritwik Chowdhury | 2022-01-25 |
| 10197614 | Fault location during pole-open condition | Brian A. Smyth | 2019-02-05 |
| 9257827 | Electrical power system phase and ground protection using an adaptive quadrilateral characteristic | Jorge Fernando Calero, Armando Guzman-Casillas | 2016-02-09 |
| 8410785 | Electrical power system phase and ground protection using an adaptive quadrilateral characteristics | Jorge Fernando Calero, Armando Guzman-Casillas | 2013-04-02 |
| 8405940 | Systems and methods for generator ground fault protection | Edmund O. Schweitzer, III, Veselin Skendzic, Bruce A. Hall, Rogerio Scharlach | 2013-03-26 |
| 8140283 | Independent frequency measurement and tracking | Angelo D'Aversa | 2012-03-20 |
| 8108165 | Acquiring phasors outside the frequency tracking range for power protective relays | — | 2012-01-31 |
| 7804303 | Apparatus and method for detecting a brush liftoff in a synchronous generator rotor circuit | Thanh X. Nguyen | 2010-09-28 |
| 7660088 | System, apparatus and method for compensating the sensitivity of a sequence element in a line current differential relay in a power system | Joseph B. Mooney | 2010-02-09 |
| 7582986 | Compensated inverse-time undervoltage load shedding systems | Ralph W. Folkers, Jeffrey B. Roberts, Edmund O. Schweitzer, III, Armando Guzman-Casillas | 2009-09-01 |
| 7498818 | Apparatus and method for detecting a brush liftoff in a synchronous generator rotor circuit | Thanh X. Nguyen | 2009-03-03 |
| 7457088 | Systems and methods for protection of electrical networks | Daqing Hou, Demetrios Tziouvaras | 2008-11-25 |
| 7239496 | Distance protective relay using a programmable thermal model for thermal protection | Edmund O. Schweitzer, III, Michael B. Bryson | 2007-07-03 |
| 6934654 | System and method for exact compensation of fundamental phasors | — | 2005-08-23 |
| 6757146 | Instantaneous overcurrent element for heavily saturated current in a power system | Stanley E. Zocholl, Armando Guzman-Casillas | 2004-06-29 |
| 6662124 | Protective relay with synchronized phasor measurement capability for use in electric power systems | Edmund O. Schweitzer, III, Luther S. Anderson, Armando Guzman-Casillas, Gregary C. Zweigle | 2003-12-09 |
| 6603298 | System for estimating the frequency of the power signal on a power transmission line | Armando Guzman-Casillas | 2003-08-05 |
| 6518767 | Line differential protection system for a power transmission line | Jeffrey B. Roberts, Hector Altuve-Ferrer, Ralph W. Folkers, Demetrios Tziouvaras | 2003-02-11 |
| 6417791 | Delta filter with an adaptive time window for protective relays | Jeffrey B. Roberts | 2002-07-09 |
| 6356421 | System for power transformer differential protection | Armando Guzman-Casillas, Hector Altuve-Ferrer, Stanley E. Zocholl | 2002-03-12 |
| 6256592 | Multi-ended fault location system | Jeffrey B. Roberts, Demetrios Tziouvaras | 2001-07-03 |