| 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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| 04/14/1981 | CA1099341A1 Circuit arrangement for detecting grounds in a static converter |
| 04/08/1981 | EP0026571A1 Protection of electrical systems using PTC devices |
| 04/01/1981 | EP0026056A1 Semiconductor integrated circuit protection arrangement |
| 03/31/1981 | US4259704 Protective circuit for zinc oxide varistors |
| 03/31/1981 | CA1098596A1 Amplifier malfunction detector |
| 03/17/1981 | CA1097738A1 Fast de-excitation brushless exciter |
| 03/11/1981 | EP0025022A1 Detector device for overcurrents and the loss of one or two phases |
| 03/11/1981 | EP0024661A1 Enhanced protection power supply |
| 03/03/1981 | US4254444 Multiphase undervoltage tripping circuitry for electrical power supply networks |
| 03/03/1981 | US4254443 Input surge protection for converter circuit |
| 02/24/1981 | US4253138 Fast/slow acting current limited for inverter power supply |
| 02/24/1981 | US4253130 Method and apparatus for heat pump system protection |
| 02/17/1981 | US4251845 Arc suppressor circuit |
| 02/17/1981 | US4251764 Interface circuit for interconnecting an electronic controller to a resistance welding machine |
| 02/17/1981 | CA1096029A1 Control circuit for temporarily and permanently energizing the contacts of a d.c. contactor |
| 02/10/1981 | US4250531 Switch-arc preventing circuit |
| 02/04/1981 | EP0023290A1 Monitoring device of the voltage stress of an electrical device |
| 02/03/1981 | US4249170 Annunciator |
| 02/03/1981 | US4249117 Anti-kickback power tool control |
| 01/28/1981 | EP0022992A1 Surveillance apparatus for a battery of condensators in a direct current filtering circuit |
| 01/28/1981 | EP0022952A1 Filter input protection |
| 01/28/1981 | EP0022834A1 Improvement relating to voltage capacitive transformers. |
| 01/28/1981 | EP0022774A1 Control for direct-current motor with separately excited field |
| 01/27/1981 | US4247806 Garage door opener |
| 01/22/1981 | WO1981000159A1 Output voltage-drop detecting apparatus |
| 01/21/1981 | EP0022582A1 Apparatus for short circuit protection of AC lines |
| 01/21/1981 | EP0022496A1 Earth-fault monitoring for a multi-phase filter circuit |
| 01/20/1981 | US4246622 Overload protective device of electric motors |
| 01/20/1981 | US4246526 Control circuit for a motor driven automatic valve |
| 01/20/1981 | US4245370 Control circuit for protecting vacuum cleaner motor from jammed beater brush damage |
| 01/13/1981 | US4245318 Circuit breaker demonstrator and distribution circuit protection coordinator apparatus |
| 01/13/1981 | US4245270 Circuit card with soft power switch |
| 01/13/1981 | CA1093435A1 Metallurgical treatment using a glow discharge |
| 01/07/1981 | EP0021434A1 Overspeed protective apparatus for a portable tool |
| 01/07/1981 | EP0020349A1 Supervision device with a passive optical detector for electrical arcs in a circuit-breaker. |
| 01/06/1981 | US4243920 Control device for monitoring machines driving revolving devices and method for operating the device |
| 01/06/1981 | CA1093153A1 Circuit for detecting a missed commutation in a self- commutating inverter |
| 12/30/1980 | US4242713 Triac output asymmetry detector |
| 12/30/1980 | CA1092685A1 Control apparatus for two-speed single phase compressor |
| 12/23/1980 | US4241369 Electrical power source for an electronic flash unit |
| 12/16/1980 | US4240123 Power breaker system |
| 12/16/1980 | CA1091742A1 Compact fail-safe buzzer |
| 12/12/1980 | EP0022774A4 Control for direct-current motor with separately excited field. |
| 12/10/1980 | EP0020073A1 Common suspension multi-line grounding protective relay |
| 12/10/1980 | EP0020047A2 Method and apparatus for fault identification in electric power transmission systems |
| 12/10/1980 | EP0019864A1 Power generation control system for vehicle generator |
| 12/10/1980 | EP0019695A1 Automatic overload cut-off device for direct current motor drives |
| 12/02/1980 | US4237531 Controlled current inverter system having semiconductor overvoltage protection |
| 12/02/1980 | US4237509 Thyristor connection with overvoltage protection |
| 12/02/1980 | US4237507 Superconducting magnetic system |
| 12/02/1980 | US4237385 Control of power supply |
| 12/02/1980 | CA1090890A1 Overload detecting circuit for a pwm amplifier |
| 11/26/1980 | EP0019012A1 Protection device with two temperature monitoring circuits for electric machines |
| 11/25/1980 | US4236198 Switching regulator |
| 11/25/1980 | US4236187 Power supply voltage stabilizer |
| 11/25/1980 | US4236186 Power breaker system |
| 11/25/1980 | CA1090419A1 Fail-safe circuit for tap-changing transformer regulating system |
| 11/18/1980 | US4234917 Commutation failure detection and restoration for SCR frequency converters |
| 11/18/1980 | US4234901 Protective relay apparatus |
| 11/18/1980 | US4234833 Door operator system using counter circuit for determining limit positions |
| 11/12/1980 | EP0018867A2 Protected electric power supply comprising a thyristor |
| 11/12/1980 | EP0018836A1 Generation control apparatus for vehicle generators |
| 11/12/1980 | EP0018626A1 Anti-kickback power tool control |
| 11/12/1980 | EP0018603A1 Anti-kickback power tool control |
| 11/12/1980 | EP0018598A1 Circuit for limiting the switching current in a series circuit consisting of a current transformer, a semi-conductor device, a protection inductance and an overload-sensitive cut-out |
| 11/11/1980 | US4233557 Switching power supply |
| 11/11/1980 | CA1089529A1 Rotor overtemperature protection for electric motors |
| 11/04/1980 | US4232301 Apparatus for automatically selectively displaying information of a plurality of kinds |
| 11/04/1980 | CA1089013A1 Dissipation limiter circuit |
| 10/29/1980 | EP0018186A1 Improved inverter circuit |
| 10/28/1980 | US4231074 Zero sequence current source for transformer having a nonwound tertiary |
| 10/28/1980 | US4231029 Automatic transfer control device and frequency monitor |
| 10/28/1980 | US4230976 Brushless, permanent magnet d-c motor with improved commutation control |
| 10/21/1980 | US4229694 Power angle relay to measure and respond to the power angle of a synchronous generator |
| 10/15/1980 | EP0017343A1 Radio frequency generators |
| 10/14/1980 | US4228477 Circuit for monitoring the current distribution in parallel-connected converted branches |
| 10/14/1980 | CA1087708A1 Protection system for electric motor |
| 10/01/1980 | EP0016569A1 Battery charging systems for road vehicles |
| 09/30/1980 | US4225897 Overcurrent protection circuit for power transistor |
| 09/30/1980 | US4225793 Arrangement for monitoring a current network |
| 09/30/1980 | CA1086825A1 Device for detecting unbalanced conditions in a polyphase equipment bank |
| 09/23/1980 | US4224652 Method and apparatus for detecting ground shorts in the rotor circuit of a generator |
| 09/23/1980 | US4224651 Monitoring a signal |
| 09/23/1980 | CA1086375A1 High speed fault diverter switch for gas-insulated systems |
| 09/17/1980 | EP0015864A1 Circuit for the determination of the reactance of a power transmission line in the case of a short circuit |
| 09/17/1980 | EP0015259A1 Process and device for detecting the position of a fault in an electric connection. |
| 09/09/1980 | US4222098 Base drive for paralleled inverter systems |
| 09/09/1980 | US4222087 Passive triac output asymmetry detector |
| 09/02/1980 | US4220900 Motor control system for a linearly reciprocating load device such as automotive vehicle closure including sun roof |
| 09/02/1980 | US4220868 Method of and system for controllably connecting load to generator |
| 09/02/1980 | US4220088 Static-resistant electric initiator |
| 09/02/1980 | CA1084995A1 Induction control circuit for current transformer |
| 09/02/1980 | CA1084993A1 Starting circuit for a pulse width modulated d.c. to d.c. converter |
| 09/02/1980 | CA1084992A1 High-voltage direct-current transmitting unit |
| 08/26/1980 | US4219856 Protective device for capacitor bank |
| 08/26/1980 | US4219798 Automotive on-board network electrical system with warning means to indicate trouble in the alternator of the system |
| 08/26/1980 | CA1084588A1 Voltage regulator |
| 08/19/1980 | US4218718 Protective relay apparatus |
| 08/19/1980 | US4218716 Programmable fault detecting relay for a transformer |
| 08/12/1980 | US4217622 Control circuit for underground mining equipment |