| 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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| 08/09/1989 | EP0215897B1 Inverter shoot-through protection circuit |
| 08/09/1989 | CN2042639U Negative revolving magnetic field monitor |
| 08/08/1989 | US4855891 Power supply design |
| 08/08/1989 | US4855861 Longitudinal differential protection |
| 08/08/1989 | US4855859 Detection device for detecting transitions to the normal state in a superconducting winding, in particular for generating electricity, and a protection device for protecting such a winding |
| 08/08/1989 | US4855664 Method and apparatus for damping oscillations of an ac generator |
| 08/08/1989 | US4855653 Obstruction detection in automatic portal control apparatus employing induction motor power factor |
| 08/02/1989 | EP0325786A1 Protective relay with selective phase selection for double power transmission lines |
| 08/02/1989 | EP0148855B1 Parallel mosfet power switch circuit |
| 08/02/1989 | CN2042251U Phase-failure protector for triphase motor |
| 08/02/1989 | CN2042250U Ripple-type transformer alarm |
| 08/01/1989 | US4853835 Protective apparatus for inverter |
| 08/01/1989 | US4853605 Load state detecting apparatus of an induction motor for controlling the spin dryer of a washing machine |
| 08/01/1989 | CA1258098A1 Apparatus for data transmission from multiple sources on a single channel |
| 08/01/1989 | CA1258094C Apparatus for measuring the potential of a transmission line conductor |
| 07/26/1989 | CN1034290A Fully automatic protection method for electric motors |
| 07/25/1989 | US4851743 DC motor speed controller having protection |
| 07/25/1989 | CA1257907A1 Electrical apparatus |
| 07/20/1989 | DE3744461A1 Method for controlling a DC voltage source which supplies a multi-quadrant actuator (controller) |
| 07/19/1989 | EP0324614A1 Motor control fail-safe circuit |
| 07/19/1989 | EP0324012A1 Shorted-coaxial-cable detector for local-area networks. |
| 07/19/1989 | CN1034097A Voltage stabilizer capable of limiting amplitude of open-circuit over-voltage to a great extent for arc furnace transformer |
| 07/18/1989 | US4849806 Bridge between semiconductor and aluminum alloy |
| 07/18/1989 | US4849677 Temperature monitoring for a DC shunt-wound motor |
| 07/18/1989 | CA1257641A1 Fast-acting spark-over detector |
| 07/12/1989 | EP0323813A1 A device for the thermal protection of an integrated electronic power circuit |
| 07/11/1989 | US4847723 Volt-per-hertz protection apparatus |
| 07/11/1989 | US4847721 Safety device for a tool powered by an electric motor |
| 07/11/1989 | US4847719 Apparatus and method for protecting the contacts of an electrical switch from current surges |
| 07/04/1989 | US4845414 Method of protecting the electric drive of a vehicle against overload |
| 07/04/1989 | CA1256943A1 Apparatus for controlling a turbo generator |
| 06/29/1989 | DE3743396A1 Method and circuit arrangement for protecting a speed-controlled washing machine drive motor |
| 06/28/1989 | EP0321702A2 A circuit for holding a MOS transistor in a conduction state in a voltage supply outage situation |
| 06/28/1989 | EP0321663A2 Protection circuitry for a commutating transistor |
| 06/28/1989 | EP0321543A1 Load control system |
| 06/28/1989 | CN1004673B Leakage and ground failure selecting circuit |
| 06/27/1989 | US4843533 Transient ride-through AC inverter |
| 06/27/1989 | US4843513 Method and arrangement for protecting turbine generators against subsynchronous resonances occurring in power transmission systems |
| 06/27/1989 | CA1256494A1 Method for partial discharge detection and breaking spark measurement in dynamo-electric high-voltage machines, and an apparatus for performing the method |
| 06/27/1989 | CA1256486A1 Transformer protective relay |
| 06/22/1989 | DE3805948A1 Overcurrent (line) circuit breaker |
| 06/22/1989 | DE3742088A1 Accumulator unit |
| 06/21/1989 | CN2039882U Voltage stabilizer and load protector |
| 06/21/1989 | CN1033499A Protection circuit for predetecting short-circuit by carrier-frequency signal |
| 06/20/1989 | US4841425 High-voltage power supply apparatus |
| 06/20/1989 | US4841405 Protective relaying apparatus for providing fault-resistance correction |
| 06/20/1989 | US4841404 Pump and electric motor protector |
| 06/20/1989 | US4841206 Speed control device for an electronic sewing machine |
| 06/14/1989 | EP0319870A2 Method for protecting the gate unit of a GTO thyristor |
| 06/14/1989 | CN1004530B Grouding protective device for electric generator excitation loop |
| 06/13/1989 | US4839575 Alternator regulator having output monitoring and limiting controls |
| 06/13/1989 | US4839570 Current limiting control circuit for d.c. motors |
| 06/13/1989 | CA1255775A1 Modular electronic temperature controller |
| 06/13/1989 | CA1255748A1 Series capacitor equipment |
| 06/08/1989 | DE3840406A1 Protective circuit for a switched-mode power supply circuit |
| 06/07/1989 | EP0319151A2 Circuit to prevent uncontrolled tripping of a protective relay |
| 06/07/1989 | EP0319020A2 Over-discharge protection circuit |
| 06/07/1989 | CN2039085U Electricity-saving device for a three-phase asynchronous motor |
| 06/07/1989 | CN2039072U Electricity-saving phase failure protector for motor |
| 06/07/1989 | CN2039071U Phase-failure protector |
| 06/07/1989 | CN2039070U Universal motor protector |
| 06/07/1989 | CN2039069U Intelligent relay for refrigerator |
| 06/07/1989 | CN2039068U Phase-failure protector |
| 06/06/1989 | US4837671 State signal formation for indicating the transition into the bypass mode of operation in an apparatus for high-voltage D-C transmission |
| 06/06/1989 | US4836323 Vehicular voltage regulating system |
| 05/31/1989 | EP0318274A2 Method and apparatus for detecting and discriminating faults in transmission circuits |
| 05/31/1989 | CN2038684U Universal protector for phase interruption of three-phase asynchronous motor |
| 05/31/1989 | CN2038683U Alarming and protecting device for phase interruption of three-phase motor |
| 05/31/1989 | CN2038682U Load regulator for small power generator |
| 05/30/1989 | US4835652 Bi-directional DC power controller with fault protection |
| 05/30/1989 | US4835648 Gas insulated switchgear |
| 05/24/1989 | CN2038293U Relay protection automatic unit |
| 05/23/1989 | US4833379 Motor control fail-safe circuit |
| 05/23/1989 | CA1254647A1 Current-limiting surge arrester disconnector |
| 05/17/1989 | EP0316204A2 Protective relay |
| 05/17/1989 | EP0316203A2 Protective relay |
| 05/17/1989 | EP0315983A1 Longitudinal differential protection system |
| 05/17/1989 | EP0315871A1 Process and device for the control of a current rectifier in an asymmetric network |
| 05/17/1989 | CN2037888U Phase-failure protector for triphase motor |
| 05/17/1989 | CN2037887U Motor protector |
| 05/17/1989 | CN2037886U Nine-function protector for triphase asynchronous motor |
| 05/17/1989 | CN2037885U Complete motor protector |
| 05/17/1989 | CN2037869U Water level controller with phase-failure protection function |
| 05/16/1989 | US4831509 Door operation control apparatus |
| 05/16/1989 | US4831483 Abnormality detection alarm circuit for output circuit |
| 05/16/1989 | US4831424 Insulated gate semiconductor device with back-to-back diodes |
| 05/16/1989 | US4831317 Method for controlling a servomotor |
| 05/16/1989 | US4831313 Two speed motor controller |
| 05/16/1989 | US4831295 Arrangement for reducing shaft voltages in dynamoelectric machines |
| 05/11/1989 | DE3737327A1 Circuit arrangement for overcurrent protection in invertors |
| 05/11/1989 | DE3736400A1 Safety device for movable parts, preferably for window raisers and sun roofs of motor vehicles |
| 05/10/1989 | EP0315366A2 A regulated dc power supply having master and slave regulators |
| 05/10/1989 | CN2037507U Phase failure protector of transister |
| 05/03/1989 | EP0313798A2 Device for limitimg the turning moment of an apparatus for hairdressing |
| 05/03/1989 | DE3735989A1 Switched-mode power supply |
| 05/03/1989 | DE3735977A1 Protection device for heating conductor |
| 05/02/1989 | US4827415 Electropneumatic door control system |
| 05/02/1989 | US4827366 Bi-polar power supply regulator bi-polar power supply regulator |
| 05/02/1989 | US4827149 Operation halting circuit |
| 04/27/1989 | DE3732334A1 Device and circuit arrangement for protection against overcurrent and overvoltage |