| 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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| 03/15/1988 | US4731690 Real load unbalance protection system for parallel variable speed constant frequency electrical power systems |
| 03/15/1988 | US4731689 Directional detection in connection with faults in a power supply network |
| 03/15/1988 | US4731688 Range limitation for a protection device in a power supply network |
| 03/10/1988 | WO1988001806A1 Switching power source device |
| 03/09/1988 | EP0258428A1 Bi-directional switch for neutral point clamped pwm inverter |
| 03/08/1988 | US4730245 Power cut detection apparatus for power converter |
| 03/02/1988 | CN86205712U Three-phase motor protector for loss of phase |
| 03/02/1988 | CN86202086U Electrical motor protector for short, loss of phase and overload current |
| 03/01/1988 | US4729084 Inverter apparatus |
| 02/25/1988 | DE3627479A1 Device for differential protection of power cables |
| 02/24/1988 | EP0256141A1 Method of controlling servo motor |
| 02/24/1988 | CN86208713U Electromagnetic phase lack protector |
| 02/24/1988 | CN86200209U Automatic converter for motors |
| 02/23/1988 | US4727467 Procedure and device to operate an HVDC transmission short coupling in the event of power system faults |
| 02/23/1988 | US4727346 Superconductor and normally conductive spaced parallel connected windings |
| 02/23/1988 | US4727305 Multi-function control system for an induction motor drive |
| 02/23/1988 | CA1233218A1 Overload detection and warning system for electric motors in power tools and the like |
| 02/18/1988 | DE3627189A1 Alternating-current network |
| 02/18/1988 | DE3623755A1 Device for overload protection of electrical drives |
| 02/16/1988 | US4725916 Short-circuit protective circuit for uninterruptible power supply equipment |
| 02/16/1988 | US4725914 For protecting an electrical energy transmission segment against faults |
| 02/16/1988 | US4725765 Method and apparatus for the protection of D.C. motors under stalled conditions |
| 02/16/1988 | CA1232948A1 Loop fault isolator |
| 02/11/1988 | WO1988001075A1 Current-limiting circuit |
| 02/10/1988 | CN86204364U Motor wiring device with overheat-protecting capacity |
| 02/09/1988 | US4724503 Phase unbalance detector |
| 02/08/1988 | EP0203972A4 Control and drive arrangement for movable members. |
| 02/03/1988 | EP0255505A1 Control and monitoring device for electrical power distribution installation |
| 02/03/1988 | EP0255067A1 Current limitation circuit arrangement |
| 02/03/1988 | CN87205805U Ac contactor with open-phase protection |
| 02/02/1988 | US4723189 Negative sequence detector for a continuous wave frequency transducer |
| 02/02/1988 | US4723098 For energizing a lamp circuit |
| 02/02/1988 | CA1232319A1 Protective means for series capacitors |
| 01/28/1988 | DE3624353A1 Method and device for monitoring fuses in an intermediate-circuit converter |
| 01/27/1988 | CN87205604U Three-phase motor broken phase overload protector |
| 01/26/1988 | US4722024 Device for detecting excess-current in a direct-current generator with controlled rectifier |
| 01/26/1988 | US4722019 Protection methods and systems for refrigeration systems suitable for a variety of different models |
| 01/26/1988 | US4722018 Blocked condenser airflow protection for refrigeration systems |
| 01/26/1988 | US4721894 Temperature monitor system for an intermittent duty wound field motor |
| 01/26/1988 | CA1232013A1 Generator protecting relay |
| 01/20/1988 | EP0253105A1 Integrated circuit with improved protective device |
| 01/20/1988 | EP0252948A1 Motor system |
| 01/20/1988 | CN87203036U Buffer for loaded switch |
| 01/20/1988 | CN87104502A Ni-he accumulator with internal short-circuit function in the case of breakdown |
| 01/19/1988 | US4719995 Control apparatus for A.C. elevator |
| 01/14/1988 | WO1988000400A1 Nickel-hydrogen storage cell with internal shorting upon failure |
| 01/14/1988 | WO1988000388A1 Protection device against short circuits for an a.c. network and breaker-limiter appropriate to such a device |
| 01/12/1988 | US4719580 Detection and location of a fault point based on a travelling wave model of the high voltage transmission line |
| 01/12/1988 | US4719555 Electric power control apparatus with first and second fixed time intervals |
| 01/12/1988 | US4719401 Zener diode looping element for protecting a battery cell |
| 01/07/1988 | EP0251928A1 Short circuit protective device for an AC power system and limiting circuit breaker suitable therefor |
| 01/07/1988 | EP0251725A2 Method of and apparatus for preventing overheating of heating element |
| 01/07/1988 | EP0250799A2 Asynchronous machine control process |
| 01/07/1988 | EP0250619A1 Hydraulic operating apparatus |
| 01/06/1988 | CN87203040U Instrument of lowing blasting-stock of vacuum loading switch |
| 01/06/1988 | CN87203039U Air vacuum loaded shunting switch |
| 01/06/1988 | CN87200523U Phase-splited protector for low-voltage operation of single phase electrical motor |
| 01/06/1988 | CN86104291A Multifuction protection switch for a motor |
| 01/05/1988 | US4717997 Abnormal condition detective circuit for a switching regulator |
| 01/05/1988 | US4717996 Gated parallel power switching devices protection circuit |
| 01/05/1988 | US4717902 Electrical components incorporating a temperature responsive device |
| 12/30/1987 | WO1987007987A1 Electronic control system, in particular for a printer |
| 12/30/1987 | CN86104376A Fully automated controller |
| 12/29/1987 | US4716486 Electric motor comprising a thermistor-type overcurrent protection device |
| 12/29/1987 | US4716309 Static relay for low DC voltages |
| 12/23/1987 | EP0250158A2 Improvements in and relating to power supplies for electrical and electronic equipment |
| 12/23/1987 | CN86211032U Thyristor speed-regulating controller used for dc motor |
| 12/17/1987 | WO1987007780A1 Capacitor circuit interruption |
| 12/16/1987 | EP0249215A1 Digital calculation type differential relay |
| 12/16/1987 | CN86203404U Energy reserving capacitance brake-jumping device for transformer substation |
| 12/15/1987 | US4713718 Microprocessor based motor protective relay with maximum number of starts per time interval limiter |
| 12/15/1987 | US4713717 Protected refrigerator compressor motor systems and motor protectors |
| 12/15/1987 | US4713652 Electrical apparatus |
| 12/15/1987 | US4713604 Monitoring device for detecting faults in an electrical device, particularly in an LC filter circuit in an AC voltage network |
| 12/15/1987 | US4713597 Silicon diode looping element for protecting a battery cell |
| 12/15/1987 | US4713591 Control and drive arrangement for movable members |
| 12/08/1987 | US4712053 Servo control for motor having cutoff device for preventing motor from being locked |
| 12/03/1987 | WO1987007451A1 Fault protection apparatus |
| 12/02/1987 | EP0247996A2 AC motor with an overheating protection device |
| 12/02/1987 | CN87103322A Controlling apparatus of alternating current elevator |
| 12/01/1987 | US4710847 Current-limiting surge arrester disconnector |
| 12/01/1987 | US4710843 Selectable integrating characteristic timer |
| 12/01/1987 | US4710841 System for production of induction machines against damage from residual voltage effects |
| 12/01/1987 | US4710735 Absorption circuit |
| 11/25/1987 | EP0246769A2 Electric motor underload protection system |
| 11/25/1987 | CN87203131U Safety type three-phase ac motor starter |
| 11/24/1987 | US4709321 Regulator protection circuit for video apparatus |
| 11/24/1987 | US4709292 Trouble detector apparatus for an air-conditioner including a counter and a timer |
| 11/24/1987 | US4709197 Control device for driving e.g. a shredding machine or a similar machine |
| 11/24/1987 | US4709196 Power window device with safety detector and control override |
| 11/24/1987 | US4708365 Apparatus for controlling seatbelt system |
| 11/19/1987 | EP0245415A1 Supply current limiter for a direct current electric motor. |
| 11/17/1987 | US4707758 Fail-safe system in a power regulation circuit for an automotive electronic circuit |
| 11/17/1987 | US4707646 Method of limiting motor power output |
| 11/12/1987 | DE3615176A1 Switched-mode power supply, especially a forward converter or push-pull converter, having electronic current limiting |
| 11/12/1987 | DE3615168A1 Switched-mode power supply, especially a flyback converter, having electronic current limiting |
| 11/11/1987 | EP0244649A1 Method and device for protecting a power tramsmission line |
| 11/11/1987 | CN86200766U General phase break protector of three-phase electric moters |
| 11/11/1987 | CN86108252A Energy-saving type multifunctional electronic thermorelay |
| 11/10/1987 | US4706177 DC-AC inverter with overload driving capability |