Patents
Sitemap › H02 - Generation, conversion, or distribution of electric power › H02H - Emergency protective circuit arrangements › 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
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)
12/1989
12/27/1989EP0347703A1 Motor controller
12/27/1989EP0347702A1 Motor controller
12/26/1989US4890185 Circuit for protecting a switching transistor
12/26/1989US4890181 Short-circuit protection device for an electrical machine fed by a pulse-controlled A.C. converter
12/26/1989US4890180 Series capacitor equipment
12/26/1989US4890020 Circuit for driving a semiconductor device with protection against transients
12/20/1989CN2049834U Ac contactor with phase interruption protecting function
12/20/1989CN2049833U Digital logic type general phase interruption protector for three-phase motor
12/20/1989CN2049832U Integrated full protector for motor
12/13/1989EP0345914A1 A motor-powered opening/closing apparatus for a window or door
12/13/1989EP0345679A2 A power supply fault protection circuit
12/13/1989CN2049426U Microcomputer power supply protective device
12/13/1989CN2049405U Overload protector
12/12/1989US4887205 Gate control system
12/12/1989US4887181 Circuit for temperature protection with hysteresis
12/12/1989US4887018 Line to line to line to neutral converter
12/06/1989EP0345066A2 Electromagnetic contactor tandem control system for thermal protection of a bidirectional motor drive
12/06/1989EP0344715A2 Semiconductor integrated circuit device having temperature detecting means
12/06/1989CN2049047U Compensator starter with full power open-phase protection
12/06/1989CN2049033U Proteclor for oil and water cooling device of transformer
12/05/1989US4885655 Water pump protector unit
11/1989
11/29/1989EP0343390A2 Motor starter with protection against short-circuit
11/29/1989CN2048646U Protector for single phase motor start
11/28/1989US4884182 Current source power converting apparatus with overvoltage protection
11/28/1989US4884162 Method and apparatus for preventing the overheat of a line feed motor for a printer
11/23/1989EP0342614A1 Safety power supply system for movable electric machines
11/22/1989CN2048262U Stater of auto-decompress with all-source protected open-phase
11/22/1989CN2048260U Multi-functional voltage regulator
11/22/1989CN2048247U Protector for motor open-phase
11/22/1989CN2048246U Automatic protector of power transformer
11/21/1989US4882782 Safety apparatus for detecting an abnormality of power control element
11/21/1989US4882682 Apparatus for detecting position of internal fault of gas insulated bus
11/21/1989US4882522 Neon circuit malfunction detector
11/21/1989CA1263144A1 Relay trouble detecting device
11/16/1989WO1989011174A1 Electronic control and protection device
11/15/1989EP0342144A2 Voltage sensitive switch
11/15/1989CN2047853U Overload protective system for ac motor
11/14/1989US4881024 Voltage sensitive switch
11/08/1989EP0341159A1 Electrical energy accumulator of the capacitive type with high capacity
11/08/1989EP0207966B1 Generating system with fault detection
11/08/1989CN2047466U Star-delta starter capable of acting as failure prevention befor starting motor
11/07/1989US4879623 Voltage transients
11/07/1989US4879622 Circuit for monitoring a superconducting magnet winding
11/07/1989US4879497 Method and device for measuring the temperature of a brushless d-c motor
11/07/1989US4879188 Bypass element for safeguarding battery cells
10/1989
10/31/1989US4878004 Motor-operated power steering apparatus
10/25/1989EP0324012A4 Shorted-coaxial-cable detector for local-area networks.
10/25/1989EP0252948A4 Motor system.
10/24/1989US4876625 Composite circuit breaker system
10/19/1989WO1989010024A1 Arrangement for controlled energy transfer for electrical supply, especially for reducing switching transients
10/18/1989CN1036482A Circuit arrangement for protecting switch transistor
10/17/1989US4875000 Current fault detection system and method for AC controller
10/17/1989US4874995 Passive seat belt device
10/11/1989EP0335904A1 Multi-phase electronic temperature controller.
10/11/1989CN2045907U Automatic protector for electrical motor
10/10/1989US4873619 Method and apparatus for controlling a static converter at an asymetrical network
10/10/1989US4873602 Ripple attenuator for AC power transmission line protective relays
10/10/1989US4873601 Spot network type power receiving and transforming protective apparatus
10/10/1989US4873474 Winch with shut-off load limiter
10/10/1989US4873453 DC motor speed controller having protection
10/10/1989CA1262268A1 Infrared signaling system for detecting a predetermined state in a high voltage device
10/04/1989EP0335194A1 Process for limiting the output current of a supply circuit
10/04/1989CN2045548U Multifunction protector for three-phase motor
09/1989
09/27/1989CN2045160U Convenient-to-use general purpose open-phase relay
09/27/1989CN2045159U Open phase protective device for three phase motor
09/27/1989CN2045158U Multifunctional protective device for motor
09/26/1989US4870527 Ground fault protection system
09/26/1989US4870333 Automatic opening and closing device for a window
09/26/1989CA1261389A1 Monitoring device for detecting faults in an electrical device
09/20/1989EP0333563A1 Electric power supply control unit for a charge in an intellegent integrated power circuit
09/20/1989EP0332974A1 Short circuit protection for a pulse converter powered electric machine operated both motorically and generatingly
09/13/1989EP0332568A1 Operating method and control circuit to monitor the start of electric high-voltage motors using asynchronous starting
09/12/1989US4866556 Circuit arrangement of a self protecting power switch
09/06/1989EP0331157A2 Switching power supply
09/06/1989EP0330851A2 Method of detection and limitation of an earth fault current
09/06/1989EP0198868B1 Electrical components incorporating a temperature responsive device
09/06/1989CN2044110U Protector of three-phase asynchronous motor
09/05/1989US4864482 Conversion circuit for limiting inrush current
09/05/1989US4864453 Protective relay with selective phase selection for double lines
09/05/1989US4864287 Apparatus and method for calibrating a motor monitor by reading and storing a desired value of the power factor
08/1989
08/30/1989EP0330604A2 Circuitry for controlling the operating device of a circuit breaker
08/30/1989EP0329926A1 Overload protection for electric motors
08/30/1989CN2043798U Electronized multifunctional protector for three phase motor
08/30/1989CN2043797U Multifunctional protector with integrated circuit for three phase motor
08/29/1989US4862307 Dual voltage distribution transformer with internal varistor surge protection
08/24/1989WO1989007852A1 A monitoring system
08/23/1989EP0328838A1 Control device for a DC motor, especially one for the control of openings in a vehicle
08/23/1989CN2043433U Multifunctional power-saving protector for motor
08/23/1989CN2043432U Multifunction switch of three-phase asynchronous motor
08/22/1989US4860156 Overvoltage protective circuit
08/22/1989US4860154 Device for protecting an integrated circuit against overload and short circuit currents
08/22/1989US4860152 Two stage protection circuit for a power MOSFET driving an inductive load
08/22/1989US4860145 Tap switching protection circuit
08/22/1989US4859884 Gate signal generator for thyristor valve
08/17/1989DE3803821A1 Oscillating-armature motor with amplitude monitoring
08/16/1989EP0328438A2 Apparatus and method for protecting the contacts of an electrical switch from current surges
08/16/1989CN2043030U High tension isolating protector with ac/dc signal transmission function
08/16/1989CN1034832A Automatic protecting motor switch against overvoltage, undervoltage, phase failure and overload
08/15/1989US4858053 Operational amplifier having an improved feedback system including an integrator having a hurry-up circuit, and an electric motor control using the same for inverse trip selection
08/15/1989US4858052 Method and means for protecting converter circuits
1 ... 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 ... 328