| 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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| 07/26/1988 | US4760487 Differential relay for protecting an electrical power transmission system |
| 07/20/1988 | EP0275238A2 Circuit arrangement for controlling the electric motors used for raising and lowering glasses in motor vehicles and the like |
| 07/20/1988 | EP0274949A1 Process for controlling and protecting against electrical arcs in a high-voltage generating device, and device for carrying out this process |
| 07/20/1988 | EP0274639A1 Protective interrupting system |
| 07/20/1988 | CN86207609U Microcomputer discretionary wiring type high voltage creepage protector |
| 07/19/1988 | US4758962 Electrical power line and substation monitoring apparatus and systems |
| 07/19/1988 | US4758919 Sectionalizer for spur lines |
| 07/14/1988 | WO1988005225A1 Motor controller |
| 07/13/1988 | CN87210832U Phase-defect automatic protection switch for energe-saving three phase motor |
| 07/12/1988 | US4757436 Current-type converter protecting apparatus |
| 07/12/1988 | US4757435 Static-controlled current-source AC/DC power converter and DC/AC power converter, and protection system embodying the same |
| 07/12/1988 | US4757242 Microprocessor based motor protective relay with half wave sampling |
| 07/06/1988 | CN87213987U Safety device for loss of phase of fitting on a.c. contactor |
| 07/06/1988 | CN87208955U Electrical motor safety device of compressing-type refrigerating equipment |
| 07/06/1988 | CN86108251A Multifunction explosion-proof automatic contactor |
| 07/06/1988 | CN86102108B Switching device isolated by gas |
| 07/06/1988 | CN85108840B Current monitoring for switching regulator |
| 07/05/1988 | US4755923 Regulated high-voltage power supply |
| 07/05/1988 | US4755902 Electronic apparatus with detachable member arranged to detect erroneous mounting of the detachable member |
| 06/29/1988 | EP0272460A1 Process and power supply system for the redundant power supply of spaced-apart users |
| 06/28/1988 | US4754361 Resinated capacitive-body capacitor with interspace and explosion-preventing device |
| 06/23/1988 | DE3642649A1 Circuit arrangement for determining the distance and direction of faults in a power distribution system |
| 06/22/1988 | EP0272005A2 An automatic door being controlled with a servo controlled safety protection device |
| 06/22/1988 | EP0271777A2 Voltage protective apparatus for variable-frequency power system |
| 06/22/1988 | EP0271678A1 Device for reducing shaft voltages at dynamo-electric machines |
| 06/22/1988 | EP0271525A1 Nickel-hydrogen storage cell with internal shorting upon failure. |
| 06/22/1988 | CN87209410U Combined temp. with current protector for three phase motor |
| 06/21/1988 | US4752851 Overload protection for series resistances of electric motors, especially of fans of vehicles driven by electric motors |
| 06/16/1988 | WO1988004488A1 Multi-phase electronic temperature controller |
| 06/15/1988 | EP0270940A1 Circuit arrangement for limiting overvoltages at an SCR and for the power supply of a control circuit of the protected SCR |
| 06/15/1988 | EP0270850A1 Method of protecting the electrical drive motor of a vehicle against overload |
| 06/15/1988 | EP0270622A1 Electronic control system, in particular for a printer. |
| 06/15/1988 | CN86210974U Auto-controlled motor protector for phase-interruption over heating |
| 06/14/1988 | US4751604 Comparison signal error detector for protective relay system |
| 06/08/1988 | EP0269952A2 Fault-tolerant ring power supply system |
| 06/08/1988 | CN86203922U Protector for high voltage directional current-leakage |
| 06/08/1988 | CN86203260U Ac contactor for phase break protection |
| 06/07/1988 | US4749924 Drive system for a vehicle accessory |
| 06/07/1988 | CA1237837A1 Power supplies for electroluminescent panels |
| 06/01/1988 | EP0268930A1 Circuit arrangement with a self-protecting power switch |
| 06/01/1988 | CN87206027U Phase-failure alarm and protection device for elecric motor |
| 05/31/1988 | US4748531 For a refrigeration system |
| 05/26/1988 | DE3738493A1 Fehlerortungseinrichtung Error locating device |
| 05/25/1988 | CN87205954U Multifunction auto protector for three phase motor |
| 05/25/1988 | CN86107818A Protective device for switch elements in pulse generating circuit of capacitive load |
| 05/24/1988 | US4747036 Fault detector apparatus having serial fault-detection signal path |
| 05/24/1988 | US4746854 Battery charging system with microprocessor control of voltage and current monitoring and control operations |
| 05/24/1988 | US4746845 Circuit for preventing the erroneous operation of a motor control device for lifting and lowering a power window |
| 05/18/1988 | EP0267194A1 Fault protection apparatus |
| 05/18/1988 | CN87106609A Three-phase semi-controlled bridge type rectifying circuit without run away |
| 05/18/1988 | CN86104948A Comprehensive protection alarm for three-phase motor |
| 05/17/1988 | US4745571 Modular electronic temperature controller |
| 05/17/1988 | US4745520 Power supply |
| 05/17/1988 | US4745513 Protection of GTO converters by emitter switching |
| 05/17/1988 | US4744672 Semiconductor arrangement |
| 05/11/1988 | EP0267064A1 Process and device for controlling an electrical motor, especially a motor for raising the window of a motor car |
| 05/11/1988 | DE3638035A1 Switching-off arrangement for a regulated power supply unit |
| 05/11/1988 | CN87210888U 3-phase motor phase-absent automatic preventer |
| 05/11/1988 | CN86204172U 3-phase unbalance load preventer |
| 05/10/1988 | US4743818 Microprocessor based motor protective relay with rotor temperature detector |
| 05/10/1988 | US4743816 Microprocessor based motor protective relay with transition control |
| 05/05/1988 | DE3635863A1 Circuit arrangement for monitoring a motor parameter |
| 05/04/1988 | EP0266254A1 Electric motor monitoring device |
| 05/04/1988 | EP0265879A2 Battery charging system |
| 05/04/1988 | CN87106171A Circuit protector of communication line |
| 05/04/1988 | CN86107283A Distance relay measured by variable of operating frequency |
| 05/04/1988 | CN86106756A Synthetic power-frequency variable-quantity directional-relay |
| 04/27/1988 | EP0264971A2 Voltage protective apparatus for variable-frequency power system |
| 04/27/1988 | CN87207258U Protector for three-phase motor |
| 04/26/1988 | US4741023 On-line test and diagnostic system for power system stabilizer |
| 04/26/1988 | US4740861 Thermal protection device for a dual input voltage lamp transformer/ballast apparatus |
| 04/26/1988 | CA1235740A1 Control apparatus for charging generator |
| 04/21/1988 | DE3635172A1 Circuit arrangement for operating a DC motor |
| 04/21/1988 | DE3634731A1 Method for limiting or interrupting the current of a drive device on reaching or exceeding an upper limiting current value, and a protection circuit for carrying out the method |
| 04/20/1988 | CN87211485U Electricity-leakage alarm with sound and light effects |
| 04/20/1988 | CN86206606U Motor protector capable of protecting motor against reversal, phase failure and overload |
| 04/19/1988 | US4739435 Safety device for an electric power tool |
| 04/19/1988 | US4739245 Overvoltage alarm circuit for vehicle generator with false actuator prevention |
| 04/14/1988 | DE3722743A1 Protective electric device with measurement of active components |
| 04/13/1988 | EP0263343A2 Power transistor with self-protection against direct secondary breakdown |
| 04/13/1988 | CN87209084U Control push botton for self-protection |
| 04/13/1988 | CN87208997U Fusing protective device of three-phase motor fuse |
| 04/13/1988 | CN86207914U Safe control circuit |
| 04/13/1988 | CN86207409U Monitor of protection for phase interruption |
| 04/12/1988 | US4737887 Electrostatic spray device provided with electric-arc protection means |
| 04/12/1988 | CA1235180A1 Apparatus for detecting arcing faults on low-voltage spot networks |
| 04/07/1988 | WO1988002478A1 Overload protection |
| 04/06/1988 | CN87204045U Protective unit of motor for loss of phase and overtemperature |
| 04/05/1988 | US4736144 Automatic door being controlled with a servo-controlled safety protection device |
| 03/30/1988 | EP0261606A2 Protection circuit arrangement |
| 03/30/1988 | CN86106455A 距离继电器 Distance Relay |
| 03/30/1988 | CN86106300A Multi-functional super-high frequency protection |
| 03/23/1988 | EP0260839A2 Protection arrangements for communications lines |
| 03/23/1988 | CN87207622U Magnetic induced elements for electric control device of electro-mechanical equipment |
| 03/22/1988 | US4733326 Protective arrangement for an electromagnetic load |
| 03/22/1988 | US4733100 Automatic on/off circuit with time delay |
| 03/22/1988 | US4733031 Switching apparatus protected against short circuit currents |
| 03/16/1988 | EP0260120A2 Control circuit with coordination provisions |
| 03/16/1988 | CN86202408U Three-phase alternating current cintactor for protection from lacking |
| 03/15/1988 | US4731721 Regulated high-voltage power supply with output shorting prevention |