| 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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| 01/09/1979 | US4133413 Elevator safety device |
| 01/09/1979 | CA1046139A1 D.c. power supply circuit |
| 01/09/1979 | CA1045937A1 Spout tube assembly |
| 01/02/1979 | US4133018 Thyristor fault-detecting apparatus |
| 01/02/1979 | US4133017 Electrical power supply fault detecting system |
| 01/02/1979 | US4133016 Apparatus driven by an electric motor and incorporating a safety device |
| 01/02/1979 | US4132085 Control apparatus including an electronic timer |
| 12/26/1978 | US4131928 Voltage clamp device for monolithic circuits |
| 12/26/1978 | US4131908 Semiconductor protection device having a bipolar lateral transistor |
| 12/26/1978 | CA1045218A1 Half-wave detector for ac switching devices |
| 12/19/1978 | US4130862 DC Power supply |
| 12/19/1978 | US4130850 High speed fault diverter switch for gas-insulated systems |
| 12/12/1978 | US4129893 Thermoelectric generator overload protective device using hysterisis control |
| 12/12/1978 | CA1044322A1 Arrangement for detecting ground leaks in the rotor circuit of a brushless synchronous machine excited by rotating rectifiers |
| 12/12/1978 | CA1044313A1 Switching device for the protection of direct current devices |
| 12/05/1978 | US4128854 Compressor minimum off-time system |
| 11/28/1978 | US4127886 Over-current protection circuit for voltage regulator |
| 11/28/1978 | US4127885 Over-current protection circuit for voltage regulator |
| 11/28/1978 | CA1043431A2 Protective circuit for pulse width modulated signal amplifier |
| 11/21/1978 | US4126889 Protective circuit for d.c. circuit |
| 11/21/1978 | CA1042983A1 Method for overvoltage protection of hvdc transmission line schemes |
| 11/21/1978 | CA1042977A1 Voltage monitoring controlling and protecting apparatus employing programmable unijunction transistor |
| 11/14/1978 | US4125885 Control apparatus |
| 11/14/1978 | US4125884 Apparatus for detecting subsynchronous current in power systems |
| 11/07/1978 | CA1042070A1 Transistor protective circuit with imminent failure sensing |
| 10/31/1978 | CA1041603A1 High voltage current-limiting interrupter |
| 10/31/1978 | CA1041599A1 Surge absorber |
| 10/17/1978 | US4121270 Series capacitor system with force firing of protective bypass device |
| 10/17/1978 | US4121140 Motor control circuit |
| 10/17/1978 | CA1040706A1 Momentary power supply shutdown system |
| 10/03/1978 | US4118749 Field overvoltage protecting apparatus for synchronous machine |
| 10/03/1978 | CA1039799A1 Protective circuit arrangement for a high-voltage capacitor bank |
| 09/19/1978 | CA1038949A1 Motor protection apparatus and method |
| 09/19/1978 | CA1038928A1 Converter circuit and method having fast responding current balance and limiting |
| 09/12/1978 | US4114084 Turbine-generator protection system with electronic sampling filter |
| 09/12/1978 | US4114077 Rotor overtemperature protection for electric motors |
| 09/05/1978 | US4112476 Ground fault protection system |
| 09/05/1978 | US4112475 D-C motor flashover protection |
| 09/05/1978 | US4112474 Capacitor protective device |
| 09/05/1978 | US4112402 Compact fail-safe buzzer |
| 09/05/1978 | CA1038032A1 Protective circuit |
| 08/29/1978 | US4110809 Solid state power controller with low level signal control |
| 08/29/1978 | US4110807 Continuity monitoring system |
| 08/29/1978 | US4110673 Extendable vehicle step and step motor control system |
| 08/22/1978 | US4109134 Power control circuit and electro(photo)graphic apparatus employing same |
| 08/22/1978 | CA1037113A1 Bypass control for a solid state switching device |
| 08/15/1978 | US4107754 Discharge gap device |
| 08/15/1978 | US4107631 Protection of high-power coaxial cables |
| 08/15/1978 | US4107584 Current limiting device for an a.c. motor |
| 08/15/1978 | CA1036672A1 Cell balance detector for electrolytic cell assemblies |
| 08/15/1978 | CA1036670A1 Ground fault detector circuit with high current inhibit |
| 08/15/1978 | CA1036669A1 Gas turbine power plant control apparatus including a temperature reset starting control system and an ignition pressure control system |
| 08/15/1978 | CA1036668A1 Overvoltage protection for a direct current transmission |
| 08/15/1978 | CA1036657A1 Capacitor bank protection relay |
| 08/08/1978 | US4106069 Protection arrangement for a brushless synchronous machine |
| 08/08/1978 | US4106068 Pressure sensitive interrupter |
| 08/08/1978 | US4106048 Integrated circuit protection device comprising diode having large contact area in shunt with protected bipolar transistor |
| 08/01/1978 | US4104689 Vacuum contactor protector |
| 08/01/1978 | US4104687 Device for detecting unbalanced conditions in a polyphase equipment bank |
| 08/01/1978 | US4104581 Method utilizing an automatic resettable circuit breaker for locating ground faults in a vehicle |
| 08/01/1978 | US4103709 Spout tube assembly |
| 07/25/1978 | US4103324 Saturable reactor-type power supply |
| 07/25/1978 | US4103317 Motor protector providing phase failure and overload cutoff for three-phase variable voltage variable frequency motor |
| 07/25/1978 | US4103217 Brushless synchronous generator with an exciter |
| 07/25/1978 | US4103178 Black start system for large steam powered electric generation plants |
| 07/18/1978 | US4101277 Detection of incipient faults in hydrogen-cooled generators |
| 07/11/1978 | US4100596 Protected aircraft power and phase converter |
| 07/11/1978 | US4100561 Protective circuit for MOS devices |
| 07/11/1978 | US4099807 Airborne pulse magnetron and power supply system |
| 07/04/1978 | US4099225 Protective circuit for an inverter |
| 06/27/1978 | US4097789 Rotation-supervised d-c fan or blower system |
| 06/20/1978 | US4096540 Protective relay circuit for regulated power supply |
| 06/20/1978 | US4096370 Microwave oven door interlock switch system |
| 06/20/1978 | US4096366 Means for detecting a loss of vacuum in vacuum-type circuit interrupters used in polyphase a.c. vacuum circuit breaker |
| 05/30/1978 | US4092691 Protective relay arrangements |
| 05/23/1978 | US4091434 Surge current protection circuit |
| 05/16/1978 | US4090228 Protective device for a system feeding a balanced load from a remote power supply |
| 05/16/1978 | US4090226 Relay protection for capacitor banks |
| 05/16/1978 | US4090225 Fail-safe circuit for tap-changing transformer regulating system |
| 05/16/1978 | US4090148 Circuit pattern for a protection circuit of a stereo amplifier |
| 05/16/1978 | US4090065 System and method for operating a steam turbine with protection provisions for a valve positioning contingency |
| 05/09/1978 | CA1031051A1 Electronic security circuit |
| 04/25/1978 | US4086642 Protective circuit and device for metal-oxide-semiconductor field effect transistor and method for fabricating the device |
| 04/25/1978 | US4086525 Circuit for preventing overdischarge of a battery |
| 04/18/1978 | US4084406 Chiller controls |
| 04/11/1978 | US4084206 Protection circuit for serially connected thyristors |
| 04/11/1978 | US4084205 Phase monitoring arrangement for a three phase network supplying a d.c. motor through a controlled converter |
| 04/11/1978 | US4084124 Method and apparatus for conditioning of nickel-cadmium batteries |
| 03/28/1978 | US4081851 Lightening protection circuit |
| 03/28/1978 | US4081725 Lift truck control providing time delay in operation of directional contactor |
| 03/21/1978 | US4080559 Torsional protective device for power system stabilizer |
| 03/14/1978 | US4079444 D.C. to A.C. electronic inverter with overload protection |
| 03/14/1978 | US4079436 5,000 Hour blocking oscillator for an electromagnetic fuel pump |
| 03/14/1978 | US4079432 Motor restart limiter |
| 03/14/1978 | US4079211 Protection device for a subscriber's telephone set |
| 03/07/1978 | US4078219 Overcurrent latch for magnetic contactor |
| 02/21/1978 | US4075677 Electrostatic coating system |
| 02/21/1978 | US4075673 Operating system for generator circuit-breakers |
| 02/14/1978 | US4074346 Power supply protective circuit |
| 02/14/1978 | US4074334 Protective device for a power element of an integrated circuit |