| 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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| 09/12/1990 | EP0386553A2 Protecting device for a synchronous motor |
| 09/12/1990 | CN2062126U Motor overload comprehensive protector by single-board microcomputer |
| 09/11/1990 | US4956740 Protection technique for superconducting magnets |
| 09/07/1990 | WO1990010338A1 Circuit for protecting switching regulator |
| 08/29/1990 | EP0384788A1 Composable protection and control device for a motor |
| 08/29/1990 | EP0384767A2 Torque coupling system |
| 08/29/1990 | EP0383962A1 High-voltage rectifier and associated control electronics |
| 08/28/1990 | US4953054 Circuit for protection against fault currents |
| 08/28/1990 | US4953053 Method and apparatus for detecting mechanical overload of a hoist |
| 08/28/1990 | US4953052 Pole slip protection circuit for paralleled generators |
| 08/28/1990 | US4952915 Failed electrical component detector for multiphase electric machines |
| 08/28/1990 | US4952854 Control device for a DC motor intended for in particular driving opening elements on automobile vehicles |
| 08/28/1990 | US4952852 Power system and synchronizing breakers for a variable speed generator motor system |
| 08/24/1990 | CA2010798A1 Torque coupling system |
| 08/22/1990 | CN2060959U Self-protecting drivers for transistor switches |
| 08/22/1990 | CN2060957U Phase interruption protectors of electric motors with characteristics of power-saving and high efficiency |
| 08/22/1990 | CN2060956U Multi-functional protecting devices for three-phase alternating current electric machinery |
| 08/22/1990 | CN2060955U Power-saving, protecting and controlling apparatus for electric motors |
| 08/21/1990 | US4951170 Method for protecting an electric object to be protected |
| 08/21/1990 | US4951168 Transformers having overload protection |
| 08/21/1990 | US4951033 Input device of character data |
| 08/21/1990 | US4950973 Permanent magnet generator system |
| 08/15/1990 | CN2060603U Energy storage type phase loss protector for three phase electric motor |
| 08/15/1990 | CN1009186B Controlling apparatus of alternating current elevator |
| 08/14/1990 | CA1272785A1 Door and door curtain controller |
| 08/08/1990 | EP0380881A2 Protection circuit for a power mosfet driving an inductive load |
| 08/08/1990 | CN2060268U Protector for loss of phase |
| 08/07/1990 | US4947282 Thyristor valve with improved gate pulse generating scheme |
| 08/07/1990 | US4947091 Device for preventing a coil of a brushless motor from burning |
| 08/01/1990 | CN2060021U Protection power-saving apparatus for three-phase interruption |
| 08/01/1990 | CN2060020U Protection contactor for phase interruption and short circuit of three-phase motor |
| 07/31/1990 | US4945298 Motor driving apparatus |
| 07/31/1990 | US4945277 Control device for a vehicle A.C. generator |
| 07/31/1990 | US4944369 Safety device for elevator |
| 07/25/1990 | CN2059777U Cl protector for loss of phase |
| 07/25/1990 | CN2059776U Single power supply integration protector for motor |
| 07/18/1990 | EP0378085A2 Exhaust gas turbine generator apparatus |
| 07/18/1990 | EP0377853A2 Control device for a vehicle a.c. generator |
| 07/18/1990 | CN2059534U Multifunctional electricity-saving ac socket set |
| 07/18/1990 | CN1044015A Loss of phase protective circuit of three phase asynchronous motor |
| 07/18/1990 | CN1008865B Three-phase semi-controlled bridge type rectifying circuit |
| 07/17/1990 | US4942494 Short-circuit protector for a half-controlled three-phase bridge |
| 07/17/1990 | US4942493 Method and apparatus for detecting prime mover start malfunction |
| 07/12/1990 | WO1990007813A1 Process for monitoring short-circuits in a voltage circuit inverter |
| 07/12/1990 | DE3900606A1 Protection of electrical cables (leads, lines) against excessive heating |
| 07/11/1990 | CN2059283U Phase-lost protector for three phase motor |
| 07/10/1990 | US4940391 Compressor surge detection system |
| 07/05/1990 | DE3844210A1 Switched-mode power supply having overload protection |
| 07/03/1990 | US4939617 Method and apparatus for monitoring an AC transmission line |
| 07/03/1990 | US4939438 Relay control assembly |
| 07/03/1990 | US4939437 Motor controller |
| 06/27/1990 | EP0375020A2 A transient protection circuit |
| 06/27/1990 | EP0374417A2 Protection device for electrical apparatuses |
| 06/27/1990 | CN2058793U Open-phase and short-circuit protector of new-type three-phase motor |
| 06/27/1990 | CN2058792U Analysis, indication and memory of fault and protective device for three phase asynchronous motor |
| 06/26/1990 | US4937723 VSCF system with an overload protection |
| 06/26/1990 | US4937561 Load detecting system for an engine driven generator |
| 06/21/1990 | DE3842426A1 Circuit arrangement for controlling and monitoring a load in a bridge circuit |
| 06/20/1990 | EP0373713A2 Semiconductor circuit having an excess voltage protection circuit |
| 06/20/1990 | EP0373712A2 Excess voltage protection circuit |
| 06/20/1990 | CN2058540U Multiple protector for converting equipment |
| 06/20/1990 | CN2058539U Silicon controlled open circuit protector for electric power current transformer |
| 06/20/1990 | CN2058538U Fast protector for three-phase motor |
| 06/19/1990 | US4935837 Phase comparison relaying system with single channel communications link |
| 06/19/1990 | US4935685 Motor controller for pumping units |
| 06/19/1990 | US4935643 Device for the limitation of torque in a hair treatment device |
| 06/19/1990 | US4935315 Cell bypass circuit |
| 06/14/1990 | WO1990006614A1 Safety device to prevent excessive battery drain |
| 06/13/1990 | EP0372823A2 Cell bypass circuit |
| 06/13/1990 | EP0372256A2 Method for the projection of a transformer and device for carrying out the method |
| 06/13/1990 | DE3841186A1 Device for electrical loads |
| 06/13/1990 | CN2058284U Protector for single phase capacitive start motor |
| 06/13/1990 | CN2058283U Multi-function protector for star connection small-size motor |
| 06/12/1990 | US4933803 Three phase loss protection circuit |
| 06/12/1990 | US4933800 Motor overload detection with predetermined rotation reversal |
| 06/12/1990 | US4933799 Highly efficient over current circuit breaker |
| 06/05/1990 | US4931791 Shorted-coaxial-cable detector for local-area networks |
| 06/05/1990 | US4931714 Device for lifting up and down window glass for vehicle |
| 05/31/1990 | WO1990006011A1 Method and apparatus for detecting prime mover start malfunction |
| 05/31/1990 | WO1990005976A1 High current pressure sensitive interrupters |
| 05/31/1990 | WO1990005919A1 Coupling unit for monitoring high-voltage installations by means of partial discharges |
| 05/29/1990 | US4930034 Protective circuit for a power pack for excitation or de-excitation of a superconduction coil system |
| 05/23/1990 | CN2057537U Multifunction autocontroller |
| 05/22/1990 | US4928220 Switching mode DC-to-DC power supply with improved current sensing |
| 05/22/1990 | US4928200 Overcurrent protection for switching mode power converter |
| 05/21/1990 | CA2003443A1 High current pressure sensitive interrupters |
| 05/16/1990 | EP0368557A2 Compressor system comprising a surge detection system |
| 05/16/1990 | CN1042277A Selective protecting method for high-voltage leakage of electricity |
| 05/15/1990 | US4926289 Actively shielded, superconducting magnet of an NMR tomography apparatus |
| 05/15/1990 | US4926280 Capacitor protection circuit for protecting storage capacitors in an electronic power supply |
| 05/15/1990 | CA1269165A1 Direct transfer trip apparatus for use with an active pilot wire communications channel |
| 05/15/1990 | CA1269154A1 Motor control circuit for motor driven power windows |
| 05/09/1990 | CN2057044U Automatic protector for lack of phase and under-voltage |
| 05/09/1990 | CN2057043U Comprikensive protector for three-phase asynchronous motor |
| 05/08/1990 | US4924158 Motor driver protection circuit |
| 05/08/1990 | CA1268841A1 Motor protection system and process |
| 05/02/1990 | CN1007857B Synthetic power-frequency variable-quantity directional-relay |
| 05/01/1990 | US4922368 Method and apparatus for detecting and discriminating faults in transmission circuits |
| 05/01/1990 | US4922364 Series capacitor equipment |
| 05/01/1990 | US4922363 Contactor control system |