| 5627712 |
Transformer differential relay |
— |
1997-05-06 |
| 4873602 |
Ripple attenuator for AC power transmission line protective relays |
— |
1989-10-10 |
| 4825323 |
Out-of-step blocking unit |
— |
1989-04-25 |
| 4825327 |
Negative and zero sequence directional overcurrent unit for AC power transmission line protection |
George E. Alexander |
1989-04-25 |
| 4821137 |
Positive sequence distance relay for AC power transmission line protection |
— |
1989-04-11 |
| 4819119 |
Faulted phase selector for single pole tripping and reclosing schemes |
— |
1989-04-04 |
| 4751604 |
Comparison signal error detector for protective relay system |
— |
1988-06-14 |
| 4686601 |
Ground distance relay for AC power transmission line protection |
George E. Alexander |
1987-08-11 |
| 4453191 |
Overvoltage directional relay |
— |
1984-06-05 |
| 4447845 |
Reactance relay |
— |
1984-05-08 |
| 4433353 |
Positive sequence undervoltage distance relay |
— |
1984-02-21 |
| 4420788 |
Phase relay for AC power transmission line protection |
George E. Alexander |
1983-12-13 |
| 4342064 |
Static distance relays with improved polarizing signal |
— |
1982-07-27 |
| 4296451 |
Ultra high speed protective relay circuit |
— |
1981-10-20 |
