| 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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| 07/01/1987 | CN86105973A 母线差动继电器 Bus Differential Relay |
| 06/24/1987 | EP0226360A2 A zener diode looping element for protecting a battery cell |
| 06/24/1987 | EP0226174A2 Fault detector apparatus |
| 06/23/1987 | US4675800 Power converter with a failure detector of a self-turn-off semiconductor element |
| 06/23/1987 | US4675798 Direct coupled switching power supply with GTO SCR switching element |
| 06/23/1987 | US4675775 Active pilot wire apparatus for electromechanical current differential relays |
| 06/23/1987 | US4675774 Direct transfer trip apparatus for use with an active pilot wire communications channel |
| 06/23/1987 | US4675773 Transmission line protection system |
| 06/23/1987 | US4675771 Fault sensing system for a transformer network |
| 06/23/1987 | US4675586 Monitoring circuit for a door operating D.C. electric motor |
| 06/23/1987 | CA1223301A1 Irradiation device |
| 06/19/1987 | DE3544232A1 Circuit arrangement for overcurrent limiting in an invertor having power semiconductors, for example GTO thyristors, which can be turned off |
| 06/17/1987 | CN86203923U Selective leakage detecting relay |
| 06/17/1987 | CN85108956A High reliability zero synchronizing electronic voltage regulator |
| 06/16/1987 | US4674021 Static inverter with an overcurrent circuit upon a short circuit |
| 06/16/1987 | US4674002 Directional comparison blocking system |
| 06/16/1987 | EP0225767A2 A silicon diode looping element for protecting a battery cell |
| 06/16/1987 | EP0225618A2 Protection circuit for a thyristor converter |
| 06/16/1987 | EP0225586A1 An overvoltage protection circuit for an integrated MOS device |
| 06/10/1987 | EP0224689A1 Device for monitoring the temperature of direct current shunt dynamos for rotary printing machines |
| 06/10/1987 | CN86203057U Internal hidden type all-function motor protector |
| 06/10/1987 | CN86200955U Open-phase & overload protection thermorelay for motor |
| 06/10/1987 | CN86106879A Automatic ground fault protection for an electric power system |
| 06/10/1987 | CN85205451U Open-phase protector for three phase asynchronous motor |
| 06/09/1987 | US4672519 Method for controlling a H.V.D.C. power transmission plant and a control means embodying the method |
| 06/09/1987 | US4672500 Protective device for electrostatic sprayer equipment |
| 06/09/1987 | US4672297 AC generator control status detecting device with short-circuit protection means |
| 06/04/1987 | WO1987003433A1 Supply current limiter for a direct current electric motor |
| 06/04/1987 | WO1987003429A1 Apparatus and method for protecting an electrical circuit |
| 06/04/1987 | DE3542752A1 Circuit arrangement for short-circuit protection of an invertor |
| 06/03/1987 | EP0224089A1 Information data output device for electric-power systems |
| 06/02/1987 | US4670830 Method and apparatus for the protection of converter equipment with GTO thyristors against short circuit |
| 06/02/1987 | US4670828 Bi-directional switch for neutral point clamped PWM inverter |
| 06/02/1987 | US4670812 System for monitoring the operating condition of a switch to prevent overstress |
| 06/02/1987 | US4670811 Differential-type protective relay |
| 06/02/1987 | US4670705 Alternator regulator protection circuit |
| 05/27/1987 | EP0223128A1 Resistance to ground checker |
| 05/27/1987 | DE3541273A1 Converter having a control and regulating device |
| 05/27/1987 | CN86106405A Information data output arrangements for electric power system |
| 05/26/1987 | US4668905 Current monitor for switching regulators |
| 05/26/1987 | CA1222306A1 Vehicle power window control |
| 05/26/1987 | CA1222305A1 Vehicle power window control circuit |
| 05/20/1987 | EP0222682A1 Signal transmission system for a comparison protection device |
| 05/20/1987 | EP0221974A1 Protection circuit for a supply unit |
| 05/20/1987 | EP0221972A1 Protection circuit for an inverter. |
| 05/19/1987 | US4667264 Apparatus for controlling the starting of a three phase load with its normal phase sequence |
| 05/19/1987 | US4667262 Device for detecting a ground fault in the rotor winding of an electric machine |
| 05/19/1987 | US4667116 Inverter control circuit |
| 05/19/1987 | US4667114 Prime mover speed sensing system and method |
| 05/13/1987 | CN86207198U Phase-current off protective device for asynchronous electric motor |
| 05/07/1987 | WO1987002836A1 Intertripping system |
| 05/07/1987 | DE3539265A1 Control circuit |
| 05/05/1987 | US4663691 Safety mechanism for electrical power line |
| 05/05/1987 | US4663537 Protective circuit |
| 05/05/1987 | CA1221413A1 Detector for shorted rotating diode of a brushless alternator |
| 05/05/1987 | CA1221412A1 Apparatus and method for detecting a rotating rectifier fault |
| 04/29/1987 | EP0219790A1 Transformer protection system |
| 04/29/1987 | EP0157868A4 Obstruction detection means. |
| 04/29/1987 | CN86107452A Power failure stop circuit for a converter |
| 04/28/1987 | US4661877 Transformer protective relay |
| 04/28/1987 | US4661876 Pressure sensitive fault interrupter |
| 04/28/1987 | US4661717 Load condition determining apparatus |
| 04/23/1987 | WO1987002523A1 Apparatus and method for protecting a motor control circuit |
| 04/23/1987 | DE3537419A1 Circuit arrangement for protecting an optically controlled thyristor |
| 04/22/1987 | EP0219409A1 Electrostatic spraying device protected against the occurrence of electric arcs |
| 04/22/1987 | EP0218867A1 Magnet coil |
| 04/15/1987 | EP0218225A2 Transmission line mounted sensor module |
| 04/15/1987 | EP0218224A2 Tool for mounting a sensor module on a live power transmission line |
| 04/15/1987 | EP0218223A2 Hinge clamp for securing a sensor module on a power transmission line |
| 04/15/1987 | EP0218222A2 Apparatus for data transmission from multiple sources on a single channel |
| 04/15/1987 | EP0218221A2 Apparatus for measuring the potential of a transmission conductor |
| 04/15/1987 | EP0218220A2 Apparatus for measuring and calculating fourier components of a power line parameter |
| 04/14/1987 | US4658344 Bridge inverter having switching elements interconnected with brass busbars |
| 04/14/1987 | US4658321 Thermal overload protection apparatus for a commutator or slipring motor |
| 04/14/1987 | CA1220514A1 Switch current sensing with snubber current suppression in a push-pull converter |
| 04/09/1987 | WO1987002090A1 Process for monitoring a driven movable door or similar |
| 04/07/1987 | US4656553 Electronically programmable universal brushless DC fan with integral tracking and locked rotor protection |
| 04/02/1987 | DE3534913A1 Circuit arrangement for current limiting for a switching-voltage regulator |
| 04/01/1987 | EP0216373A2 Induction generator/motor system |
| 04/01/1987 | EP0216358A2 Power cut detection apparatus for power converter |
| 04/01/1987 | EP0216263A2 Security apparatus for power converter |
| 04/01/1987 | CN85205544U Phase-off protector for three-phase motor |
| 03/31/1987 | US4654806 Method and apparatus for monitoring transformers |
| 03/31/1987 | US4654617 Magnetic circuit control apparatus |
| 03/31/1987 | US4654567 Blocking protection arrangement for electronically commutated DC motors |
| 03/25/1987 | EP0215493A1 Protected MOS transistor circuit |
| 03/25/1987 | CN86204010U Multifunctional electric machine-protecting appliance |
| 03/24/1987 | US4652965 High level magnetic trip circuit |
| 03/24/1987 | US4652963 Series capacitor equipment |
| 03/24/1987 | US4652801 Method and device for controlling an apparatus |
| 03/24/1987 | US4651922 Apparatus for controlling rotational speed of radiator fan |
| 03/18/1987 | EP0214484A1 Digital protective relay apparatus |
| 03/18/1987 | EP0214483A1 Method for measuring distance in digital distance relays |
| 03/18/1987 | CN86206253U Fast selector of breaker for distributing station |
| 03/17/1987 | US4651267 Proportional base drive circuit for transistorized bridge inverter |
| 03/17/1987 | US4651253 Shunting element |
| 03/11/1987 | EP0213837A2 Modular electronic temperature controller |
| 03/11/1987 | CN86101802A Sudden pressure relay supervisory apparatus |
| 03/04/1987 | EP0212854A1 Protective triggering of thyristor in a pulse generator |
| 03/04/1987 | EP0212417A1 Turbo-generator regulation device |