| Patents for H02H 7 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions (32,726) |
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| 04/12/1977 | US4017789 Current overload protection circuit |
| 04/12/1977 | US4017781 D.C. voltage converter |
| 04/12/1977 | US4017779 Battery isolator |
| 04/12/1977 | US4017778 Motor protection circuit |
| 04/12/1977 | US4017775 Fault detector circuit with two-fault memory |
| 04/12/1977 | US4017765 Short circuit protected electronic control system |
| 04/05/1977 | US4016468 Controlled rectifier motor drive system including d.c. fault detection and commutation means |
| 04/05/1977 | US4016459 Protective system for intermittently operating semiconductor switch |
| 04/05/1977 | US4016390 Induction heating apparatus with protective circuit arrangement |
| 03/29/1977 | US4015228 Surge absorber |
| 03/29/1977 | US4015186 System for limiting torque in a turbine-generator shaft |
| 03/29/1977 | US4015170 Method for overvoltage protection of HVDC transmission line systems |
| 03/22/1977 | US4013952 Means for current measuring in static convertors |
| 03/22/1977 | US4013938 Power supply system for providing uninterrupted output power |
| 03/15/1977 | US4012667 Protective device for series capacitor |
| 03/01/1977 | US4010342 Induction cooking appliance having improved protection circuits |
| 02/22/1977 | US4009432 Constant current supply |
| 02/08/1977 | US4007409 Method of and device for controlling a d.c. washing machine motor |
| 01/25/1977 | US4005350 Arrangement for protection of self-controlled inverter fed from an intermediate d.c. voltage link |
| 01/25/1977 | US4005344 Protection circuit for battery powered electronic devices |
| 01/25/1977 | US4005342 Integrated circuit overvoltage protection circuit |
| 01/25/1977 | US4005340 Apparatus for the current limiting interruption of currents at high voltages |
| 01/11/1977 | US4002963 Converter circuit and method having fast responding current balance and limiting |
| 01/11/1977 | US4002949 Transformer protective system |
| 01/11/1977 | US4002947 Arcing stacked plate nonlinear resistor for voltage limiter applications such as series capacitor protection |
| 01/04/1977 | US4001643 Method and apparatus for a power circuit breaker controller |
| 12/28/1976 | US4000464 Arrangement for detecting ground leaks in the rotor circuit of a brushless synchronous machine excited by rotating rectifiers |
| 12/28/1976 | US4000446 Overload protection system for three-phase submersible pump motor |
| 12/28/1976 | US4000443 Voltage control |
| 12/28/1976 | US4000410 Circuit arrangement for superposing starting conditions at an electrical operating means-simulator composed of RC-elements |
| 12/21/1976 | US3999115 Dynamic stabilizer for synchronous machines having torsional oscillations and method |
| 12/21/1976 | US3999113 Overcurrent detection apparatus for controlling power supplies |
| 12/21/1976 | US3999104 Electronic safety circuits |
| 12/21/1976 | US3999087 Missing phase detection circuit for use with three-phase power sources |
| 12/07/1976 | US3996497 Protective circuit |
| 12/07/1976 | US3996480 Sample and hold-circuit arrangement for an electrical motor simulator of an electronic motor protection relay |
| 11/30/1976 | US3995199 Compressor motor protection |
| 11/30/1976 | US3995198 High voltage circuit breaker |
| 10/26/1976 | US3988661 Power supply system for generating constant power under maximum current conditions |
| 10/26/1976 | US3988641 Phase breakdown- and null current-detector, especially for an electronic motor protection relay possessing current-dependent triggering |
| 10/12/1976 | US3986103 Monitoring circuit for a plurality of valves |
| 10/05/1976 | US3984755 Voltage regulator |
| 10/05/1976 | US3984734 Protective circuit arrangement for a high-voltage capacitor bank |
| 09/28/1976 | US3983471 Voltage regulating system |
| 09/14/1976 | US3980929 Corona current interrupter |
| 09/07/1976 | US3979645 Protective circuit for short-circuit and overload protection of a power circuit |
| 08/31/1976 | US3978393 High efficiency switching regulator |
| 08/31/1976 | US3978382 Control apparatus for two-speed, single phase compressor |
| 08/31/1976 | US3978381 Emergency operation of a static scherbius device |
| 08/31/1976 | US3978374 Method and apparatus for the detection of short circuits |
| 08/31/1976 | US3978373 Circuit breaker |
| 08/31/1976 | US3978307 Induction heating apparatus with protective circuit arrangement |
| 08/24/1976 | US3976919 Phase sequence detector for three-phase AC power system |
| 08/24/1976 | US3976917 Protection device for a power plant to prevent overloading in the event of short circuits |
| 08/10/1976 | US3974430 Motor protection circuit |
| 08/10/1976 | US3974422 Circuit arrangement for overload protection of a drive motor |
| 08/10/1976 | US3974404 Integrated circuit interface stage for high noise environment |
| 08/03/1976 | US3973233 Circuit interrupter |
| 08/03/1976 | US3973185 Circuit for monitoring the inductance of an inductive load to indicate occurrence of a fault |
| 08/03/1976 | US3973169 Overvoltage protection for high voltage shunt capacitor banks |
| 07/20/1976 | US3970898 Method of automatically isolating a faulty section of a power line belonging to an electrical energy supply network, and arrangement for carrying out this method |
| 07/20/1976 | US3970897 Detector and apparatus incorporating the same for detecting phase-asymmetry and protecting three-phase motors against dangerous operating conditions |
| 07/13/1976 | US3969655 Protective circuit arrangement for capacitor voltage transformers |
| 07/06/1976 | US3968418 Convertor connection with asymmetry indicating means |
| 07/06/1976 | US3968409 Ground fault detector circuit with high current inhibit |
| 06/29/1976 | US3967169 Switching device for the protection of direct current devices |
| 06/29/1976 | US3967132 Air operated power transfer apparatus |
| 06/29/1976 | US3965759 Safety device for the drive of a closing member |
| 06/22/1976 | US3965396 Condition responsive control circuit |
| 06/15/1976 | US3963962 Motor protector |
| 06/08/1976 | US3962624 Thyristor rectifier |
| 06/01/1976 | US3959984 Motor protection apparatus using fusible links |
| 05/25/1976 | US3959704 Solid state motor starter and overload protector circuit |
| 05/18/1976 | US3958152 Protection circuitry for cathode ray tubes |
| 05/11/1976 | US3956671 Protection device for objects included in electrical power supply networks |
| 05/11/1976 | US3955359 Bearing temperature system failure detection apparatus suitable for use in power plants and like apparatus |
| 05/04/1976 | US3955132 Intrinsically safe power supply apparatus |
| 05/04/1976 | US3955121 Short-circuit protective systems |
| 04/13/1976 | US3950686 Series redundant drive system |
| 04/13/1976 | US3950675 Motor protection device |
| 04/06/1976 | US3949239 Circuit for actuating a monostable or bistable inductive device |
| 03/30/1976 | US3947859 Electric circuit-breaker apparatus |
| 03/30/1976 | US3947748 Fault commutation system for static inverters |
| 03/30/1976 | US3947728 Network protector relay |
| 03/30/1976 | US3947726 Reverse voltage surge protection for high-voltage thyristors |
| 03/30/1976 | US3947725 Protective system for a capacitor voltage transformer |
| 03/30/1976 | US3946574 Control circuit for refrigeration compressor motor |
| 03/23/1976 | US3946280 Overload protection circuit |
| 03/16/1976 | US3944913 System for effecting tap changes of tapped transformer windings by means of thyristors |
| 03/16/1976 | US3944886 Protection apparatus for a capacitor connected in series with an electric power circuit |
| 03/16/1976 | US3944846 Subsynchronous relay |
| 03/16/1976 | US3944723 Station for power line access data system |
| 03/09/1976 | US3943427 Apparatus for protecting the thyristors of a high-voltage controlled converter from overvoltage |
| 03/09/1976 | US3943419 Protective device for at least one thyristor |
| 03/09/1976 | US3943408 Over-voltage protection circuit for wye connected electric machine |
| 03/09/1976 | US3943373 Gas turbine power plant control apparatus including a speed/load hold and lock system |
| 03/09/1976 | US3943371 Gas turbine power plant control apparatus including automatic load pickup |
| 03/02/1976 | US3942104 Cell balance detector for electrolytic cell assemblies |
| 03/02/1976 | US3942096 Voltage regulating system |
| 03/02/1976 | US3942075 Semi-conductor thermal protection arrangement |