| 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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| 11/10/1987 | US4706155 In an alternating current electrical distribution system |
| 11/10/1987 | US4706152 Protected refrigerator compressor motor systems and motor protectors therefor |
| 11/04/1987 | EP0243412A1 Intertripping system |
| 11/04/1987 | CN87100300A Restoring circuit for complementary metal-oxide-semiconductor locking-in state |
| 11/04/1987 | CN85105359A Grounding protective device for electric generator rotor |
| 11/03/1987 | US4704653 Transformer differential relay with speed-up apparatus |
| 10/28/1987 | EP0242368A1 Proportional base drive circuit |
| 10/27/1987 | US4703410 Power failure indicator |
| 10/27/1987 | US4703387 Electric motor underload protection system |
| 10/27/1987 | US4703385 In a high voltage network |
| 10/27/1987 | CA1228641A1 Method and apparatus for monitoring and protecting a semiconductor output device |
| 10/21/1987 | EP0241853A2 Apparatus for detecting abnormality of primary current for vector control |
| 10/21/1987 | EP0241832A1 Method and device for directional detection of a fault on a power transmission line |
| 10/21/1987 | EP0241764A1 Process and devices for detecting and localizing damages in electrical installations |
| 10/21/1987 | CN87102809A Device for detecting abnormal phenomenon of primary current in vector control |
| 10/21/1987 | CN86108249A Automatic multifunctional protector of a refrigerator |
| 10/20/1987 | US4701824 Protected refrigerator compressor motor systems and motor protectors therefor |
| 10/20/1987 | US4701684 Door or gate obstruction control |
| 10/14/1987 | EP0241105A2 Electronically programmable universal brushless dc fan with integral tracking and locked rotor protection |
| 10/14/1987 | EP0240883A2 Method for obtaining a deep discharge protection for a rechargeable battery, and circuit arrangement to perform the method |
| 10/14/1987 | EP0240617A1 Power failure indicator |
| 10/14/1987 | CN87202183U Bypass type protector for ac electric motor |
| 10/14/1987 | CN87200943U Overheat protector for electric motor |
| 10/13/1987 | US4700117 Centrifuge overspeed protection and imbalance detection system |
| 10/07/1987 | EP0240434A1 Protection circuit for a switching power supply |
| 10/07/1987 | EP0239965A2 Method and circuit for excitation of a multiphase distance protection |
| 10/07/1987 | CN86210877U Current meter type protection device for phase break and overload of electric motor |
| 10/06/1987 | US4698736 Protection circuit for a power converter apparatus |
| 10/06/1987 | US4698719 Protective triggering of thyristors in a pulse generator |
| 10/06/1987 | US4698718 Electronic reverse power relay |
| 10/06/1987 | US4698565 Hoist with overload safety protection |
| 10/03/1987 | CN86203853U Combined protective switch for electric motor |
| 09/29/1987 | US4697220 Protective device for auto illumination system |
| 09/29/1987 | US4697219 Snubber circuit for gate turnoff thyristor |
| 09/29/1987 | US4697218 Overcurrent protection device |
| 09/24/1987 | DE3609793A1 Circuit arrangement for starting a single-phase motor in the correct rotation direction |
| 09/22/1987 | US4695779 Motor protection system and process |
| 09/17/1987 | DE3608555A1 Method for limiting the current of an electric motor |
| 09/16/1987 | EP0237412A1 Process for the electronic protection of an electrical motor and device for carrying it out |
| 09/15/1987 | US4694374 Programmed overexcitation protective relay and method of operating the same |
| 09/15/1987 | US4694371 Protection circuit for stalling protection in commutatorless direct current motors |
| 09/15/1987 | US4694193 Fault recognition circuit for parallel power supply devices feeding a user |
| 09/15/1987 | US4694188 Apparatus for controlling a turbo generator |
| 09/15/1987 | EP0207966A4 Generating system with fault detection. |
| 09/09/1987 | CN86206148U Electronic open-phase protector for three-phase motors |
| 09/08/1987 | US4692854 Method and apparatus for modulating inverter pulse width |
| 09/08/1987 | US4692781 Semiconductor device with electrostatic discharge protection |
| 09/02/1987 | EP0130981B1 Short circuit protection apparatus |
| 09/01/1987 | US4691149 Apparatus and method for protecting a motor control circuit |
| 09/01/1987 | CA1226354A1 Stepper motor door control apparatus and method |
| 08/27/1987 | WO1987005167A1 Method of controlling servo motor |
| 08/27/1987 | WO1987005163A1 Bi-directional switch for neutral point clamped pwm inverter |
| 08/26/1987 | CN86108204A Transformer differential relay with speed-up apparatus |
| 08/25/1987 | US4689752 System and apparatus for monitoring and control of a bulk electric power delivery system |
| 08/25/1987 | US4689734 High-voltage direct-voltage source |
| 08/25/1987 | US4689733 Method for reducing dynamic overvoltages in an alternating-current system to which a direct-current system is connected |
| 08/25/1987 | US4689709 Digital distance relay |
| 08/25/1987 | US4689708 Zone protective directional relay scheme |
| 08/25/1987 | US4689707 Superconductive magnet having shim coils and quench protection circuits |
| 08/25/1987 | US4688323 Method for fabricating vertical MOSFETs |
| 08/25/1987 | CA1226042A1 Induction heating apparatus with protection against power interruption |
| 08/19/1987 | EP0232324A1 Overspeed protection signal override system for a centrifuge apparatus |
| 08/18/1987 | US4688137 Superconducting coil device |
| 08/18/1987 | US4688136 Gas insulated switchgear |
| 08/18/1987 | US4688065 MOS type semiconductor device |
| 08/18/1987 | US4687946 System and method for operating a steam turbine with digital computer control and with improved monitoring |
| 08/18/1987 | CA1225716A1 Method and apparatus for detecting surge in centrifugal compressors driven by electric motors |
| 08/18/1987 | CA1225700A1 Electrical monitoring systems |
| 08/13/1987 | DE3604049A1 Overvoltage protection device |
| 08/13/1987 | DE3603740A1 Device for monitoring the status (condition) of electrical machines |
| 08/12/1987 | EP0231917A2 Current-type converter with overvoltage protection |
| 08/12/1987 | CN87101673A Fluorescent lamp transducer with protective circuit |
| 08/11/1987 | US4686618 Fault protection for GTO voltage-source inverters |
| 08/11/1987 | US4686602 Protective circuit arrangement for protecting semiconductor components |
| 08/11/1987 | US4686598 Safety circuit for vehicle electromotive window lifts |
| 08/06/1987 | DE3603358A1 Remote-control data transmission procedure |
| 08/04/1987 | US4685045 Device for failure detection in series-connected semiconductor rectifiers |
| 08/04/1987 | US4685020 Shutdown circuit for blocking oscillator power supply |
| 07/28/1987 | US4683513 Dual current transformer current sensing method and sensor |
| 07/28/1987 | US4683411 Synchronous motor protection |
| 07/28/1987 | CA1224842A1 Parallel mosfet power switch circuit |
| 07/23/1987 | EP0211005A4 Transistor inverter interlock circuit. |
| 07/23/1987 | DE3601160A1 Method and device for protection of a converter |
| 07/23/1987 | DE3546161A1 Transistor output stage, especially a line output stage or switched-mode power supply |
| 07/22/1987 | CN86108478A Direct transeer trip apparatus for use with an active pilot wire communications channel |
| 07/21/1987 | US4682263 Electrical short-cicruit monitoring arrangement for variable-speed, three-phase motors, including their feed lines |
| 07/16/1987 | WO1987004276A1 Motor system |
| 07/15/1987 | EP0228613A1 Process for the detection of partial discharges and for measuring arc disruption in dynamo-electrical high-voltage machines, and circuit for carrying it out |
| 07/15/1987 | CN86207960U Multifunctional electric motor-protecting device |
| 07/15/1987 | CN86108311A Active pilot were apparatus for electromecanical current differential relays |
| 07/14/1987 | US4680512 Fault protection apparatus for traction motor circuit |
| 07/08/1987 | EP0228153A1 Apparatus for detecting degradation of an arrester |
| 07/08/1987 | EP0227849A1 Electric power control apparatus |
| 07/07/1987 | US4679112 Transistor protection circuit for automotive motor control applications |
| 07/07/1987 | US4679111 Resistance to ground checker |
| 07/07/1987 | US4678980 Power failure stop circuit for a converter |
| 07/07/1987 | US4678975 Motor control circuit for motor driven power windows |
| 07/07/1987 | CA1223920A1 Electric drive for vehicle windows or roof panel |
| 07/01/1987 | EP0227407A2 A protection circuit for a power converter apparatus |
| 07/01/1987 | CN86108210A Protective circuit for thyristor converter |