Issued Patents All Time
Showing 26–38 of 38 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8289668 | Charging current compensation for line current differential protection | Bogdan Z. Kasztenny | 2012-10-16 |
| 8275486 | Electric power system automation using time coordinated instructions | Edmund O. Schweitzer, III, David E. Whitehead, Gregary C. Zweigle, Robert E. Morris | 2012-09-25 |
| 8275487 | Electric power system automation using time coordinated instructions | Edmund O. Schweitzer, III, David E. Whitehead, Gregary C. Zweigle, Robert E. Morris | 2012-09-25 |
| 8275485 | Electric power system automation using time coordinated instructions | Edmund O. Schweitzer, III, David E. Whitehead, Gregary C. Zweigle, Robert E. Morris | 2012-09-25 |
| 8194374 | Differential element with harmonic blocking and harmonic restraint operating in parallel | Armando Guzman-Casillas | 2012-06-05 |
| 8154836 | Line current differential protection upon loss of an external time reference | Bogdan Z. Kasztenny, Luther S. Anderson | 2012-04-10 |
| 8031447 | Transformer through-fault current monitor | Armando Guzman-Casillas | 2011-10-04 |
| 7940054 | System and method to zero-sequence verify ground return path integrity by comparing measured zero-sequence current in an autotransformer with a second zero-sequence current source | Casper A. Labuschagne | 2011-05-10 |
| 7903381 | Negative sequence differential element | Casper A. Labuschagne | 2011-03-08 |
| 7425778 | Apparatus and method for compensating secondary currents used in differential protection to correct for a phase shift introduced between high voltage and low voltage transformer windings | Casper A. Labuschagne | 2008-09-16 |
| 7345863 | Apparatus and method for identifying a loss of a current transformer signal in a power system | — | 2008-03-18 |
| 7345488 | Apparatus and method for determining a faulted phase of a three-phase ungrounded power system | — | 2008-03-18 |
| 7196884 | Apparatus and method for detecting the loss of a current transformer connection coupling a current differential relay to an element of a power system | Armando Guzman-Casillas | 2007-03-27 |