| 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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| 04/24/1991 | EP0423927A2 Monitoring system for detecting quench |
| 04/24/1991 | EP0423226A1 Conversion circuit for limiting inrush current |
| 04/23/1991 | CA1283470C Loss of electrical feedback detector |
| 04/18/1991 | WO1991005393A1 Device for protecting a fluorescent tube installation |
| 04/17/1991 | EP0422388A1 Circuit for electrically powered closing parts of motor vehicles |
| 04/16/1991 | CA1283165C Method for reducing dynamic overvoltages in an alternating-currentsystem |
| 04/16/1991 | CA1283161C Transformer protection system |
| 04/11/1991 | DE4030475A1 Electric motor control affording warning of impending overheat - comparing predetermined critical temp. entry with on-off control signal count correlated with obtd. thermodynamic characteristics |
| 04/10/1991 | CN2074955U 电机节能保护器 Electrical energy protection |
| 04/10/1991 | CN2074944U Centralization control protective cabinet for large capacity capacitor |
| 04/10/1991 | CN1050594A Operation control circuit for pump motor |
| 04/09/1991 | CA1282817C Compressor terminal block and overload protector assembly |
| 04/04/1991 | WO1991004607A1 D.c. motor control system |
| 04/03/1991 | EP0420483A2 Motor stall sensing circuit |
| 04/03/1991 | EP0419761A2 Frequency control based on sensing voltage fed to an induction motor |
| 04/03/1991 | CN2074509U Safety accumulator |
| 04/03/1991 | CN1050472A 电源系统 Power Systems |
| 03/30/1991 | CA2024683A1 Electrical power system with remote monitoring and control of protective relays |
| 03/27/1991 | EP0419230A2 Snubber circuit of power converter |
| 03/27/1991 | EP0419015A2 Power supply system |
| 03/27/1991 | CN2074067U Energy-saving automatic protector for electric motor |
| 03/27/1991 | CN2074066U Multifunctional protector for motor |
| 03/27/1991 | CN1012218B Load state detecting apparatus of an induction motor |
| 03/26/1991 | US5003242 Reduced voltage starter |
| 03/21/1991 | DE4018165C1 High power insulated gate transistor circuitry - has additional capacitor and thyristor fired by rectifier overcurrent in series across DC voltage source |
| 03/20/1991 | EP0417933A2 Circuits for detecting a decrease in the voltage of a DC source |
| 03/20/1991 | EP0417641A2 Device for producing electron beams, particularly for an electron gun |
| 03/20/1991 | CN2073627U Protective equipment of loss of phase of three phases motor |
| 03/20/1991 | CN2073626U Protective equipment of loss of phase of motor |
| 03/20/1991 | CN1012056B Safety device for ac elevator |
| 03/19/1991 | CA1281769C Electronically programmable universal brushless dc fan with integral tracking and locked rotor protection |
| 03/19/1991 | CA1281768C Protection arrangements for communications lines |
| 03/13/1991 | CN2073192U Short-circuit self-protecting silicon-controlled single-phase inverter |
| 03/13/1991 | CN2073184U Phase loss protector for three-phase electric motor |
| 03/12/1991 | US4999760 High voltage rectifier and associated control electronics |
| 03/12/1991 | US4999552 Torque motor driver |
| 03/12/1991 | CA1281407C Directional comparison blocking system |
| 03/12/1991 | CA1281373C Short circuit protection device including a breaker-limiter for alternating current |
| 03/07/1991 | DE3928801A1 Contact breaker protection of low voltage halogen lamps - having monitored current compared with threshold valve to control supply to lamp |
| 03/06/1991 | EP0415866A2 Power supply for a display device provided with shutdown means |
| 03/06/1991 | EP0415712A2 A superconducting sensor for quench detection in a superconductor |
| 03/06/1991 | EP0415710A2 Passive superconducting quench detection sensor |
| 03/06/1991 | EP0415709A2 Hydraulic sensor for quench detection and location in superconductors |
| 03/06/1991 | CN2072740U Phase-missing protected relay for three-phase motor |
| 03/06/1991 | CN2072739U Sy-2 type motor protecting unit |
| 03/05/1991 | US4998097 Mechanically operated pressure switch having solid state components |
| 03/05/1991 | CA1281068C Fault protection apparatus for traction motor circuit |
| 03/01/1991 | CA2024323A1 Hydraulic sensor for quench detection and location in superconductors |
| 03/01/1991 | CA2024322A1 Pacman quench detector |
| 03/01/1991 | CA2024321A1 Superconducting sensor for quench detection in a superconductor |
| 03/01/1991 | CA2024319A1 Passive superconducting quench detection sensor |
| 02/28/1991 | DE3929236A1 Protection circuit for AC user current connection units - has measurement input connected at line to be monitored and comparator |
| 02/27/1991 | EP0413893A2 Process and circuit for monitoring of regulating elements with electric motors |
| 02/27/1991 | CN2072292U Heat relay with phase interruption function |
| 02/27/1991 | CN2072291U Multifunctional protector for three-phase motor |
| 02/27/1991 | CN2072290U Solid phase-interruption relay |
| 02/27/1991 | CN2072289U 110-220kv mutual-inductor resonance inhibiting apparatus |
| 02/27/1991 | CN2072288U Electrical apparatus starter with phase interruption protecting function |
| 02/27/1991 | CN1049576A Phase cut-off protector of phase and width discrimination |
| 02/26/1991 | US4996625 Power source unit for image recording apparatus |
| 02/26/1991 | US4996472 Passive superconducting quench detection sensor |
| 02/21/1991 | WO1991002397A1 Generator with auxiliary fan |
| 02/20/1991 | CN2071841U Count mean type phase comparator |
| 02/20/1991 | CN2071840U Open-phase and phase short-circuit protection device for three-phase motor |
| 02/20/1991 | CN2071839U Protection arrangement for motor |
| 02/20/1991 | CN2071838U Open-phase protection device for three-phase motor |
| 02/20/1991 | CN2071837U Single phase open-phase protection device for three-phase motor |
| 02/19/1991 | US4994935 Superconducting magnet apparatus with an emergency run-down system |
| 02/19/1991 | US4994724 Servo-controlled automatic door having automatic detecting and adjusting mechanism |
| 02/19/1991 | US4993337 Sewing machine with automatic thread control and thread breakage detecting devices |
| 02/19/1991 | CA1280501C Multiple time delay power controller apparatus |
| 02/13/1991 | EP0412764A2 Supervisory system for superconductive transformer |
| 02/13/1991 | EP0412478A1 Generator load break switch |
| 02/13/1991 | CN2071401U High voltage motor control cabinet |
| 02/12/1991 | US4992905 High current pressure sensitive interrupters |
| 02/12/1991 | US4992836 Device for controlling the electrical supply to a load, in a "smart" power integrated circuit |
| 02/07/1991 | WO1991001582A1 Pole slip protection circuit for paralleled generators |
| 02/07/1991 | DE3925174A1 Overvoltage protection circuit for DC source and load - has thyristor switch, limiting inductance and comparator logic control for limiting current surge to reservoir capacitor during transient |
| 02/06/1991 | EP0412056A1 Electronic safety circuit |
| 02/06/1991 | EP0411147A1 Circuit for protecting switching regulator |
| 02/06/1991 | CN2070963U 电磁自动控制器 Electromagnetic automatic controller |
| 02/06/1991 | CN2070962U Three phase ac motor controller |
| 02/06/1991 | CN2070961U Leakage, interruption phase, overvoltage and overcurrent automatic circuit breaker |
| 02/06/1991 | CN2070960U Open-phase protection ac contactor |
| 02/05/1991 | US4991049 Anti-short-cycle circuit |
| 02/05/1991 | US4989989 Hydraulic sensor for quench detection and location in superconductors |
| 02/04/1991 | CA2022599A1 Safety apparatus for superconducting magnetic energy stored system |
| 01/31/1991 | DE3924653A1 Monitoring circuit for pulse controlled DC load - provides binary logic sensing and control of fault condition in load or its associated FET switching device |
| 01/30/1991 | EP0410423A2 Multiple power supply system |
| 01/30/1991 | CN2070508U Phase cut-off relay |
| 01/29/1991 | US4988931 For rotating a bi-directional electric motor |
| 01/23/1991 | EP0409328A2 A switched bridge circuit |
| 01/23/1991 | EP0409286A2 Overheat preventing system of A.C. motor |
| 01/23/1991 | CN2070049U Open-phase protector for three-phase asynchronous motor |
| 01/23/1991 | CN2070048U Overtemperature protector for motor |
| 01/22/1991 | US4986379 Vehicle |
| 01/22/1991 | CA1279367C Protection circuit for a thyristor converter |
| 01/16/1991 | EP0408493A1 Stopping device for single-phase asynchronous motor with capacitor |
| 01/16/1991 | EP0407525A1 Safety device to prevent excessive battery drain. |
| 01/16/1991 | EP0276296A4 Current-limiting circuit |