Patents
Sitemap › H02 - Generation, conversion, or distribution of electric power › H02H - Emergency protective circuit arrangements › H02H 3 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection
Patents for H02H 3 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection (33,031)
08/1981
08/11/1981CA1106917A1 Distance relaying systems
08/05/1981EP0033190A1 Overcurrent protection devices
08/05/1981EP0032985A2 Line driver circuit with short circuit protection
08/04/1981US4282479 Test apparatus for locating shorts during assembly of electrical buses
08/04/1981CA1106440A1 Hazardous voltage protector for telephone line
07/1981
07/28/1981US4281386 Systems for detecting faults in electric power systems
07/28/1981US4281358 Multifunction dynamoelectric protection system
07/28/1981CA1105999A1 Arrangement for monitoring a current network
07/21/1981US4280162 Ground fault circuit interrupter
07/14/1981USRE30678 Dormant oscillator ground to neutral protection for ground fault interrupters
07/14/1981US4279007 Single-phase fault detecting circuit breaker
07/07/1981US4277811 Static type circuit breaker
07/07/1981CA1104702A1 Ground fault protective device
07/01/1981EP0030980A1 Stabilized dc power source
06/1981
06/30/1981US4276605 Method and apparatus for supervising a digital protective relaying system
06/30/1981US4276576 Lightning activated relay
06/30/1981US4276510 Apparatus for sensing current transformer primary current as a function of differential core inductance
06/30/1981CA1104243A1 Ground fault circuit interrupter module
06/25/1981WO1981001759A1 Device for monitoring abnormality in sampled signals
06/23/1981US4275445 Delayed action electrical protection device, depending on an adjusted magnitude
06/23/1981US4275429 Protective relay apparatus
06/17/1981EP0030445A2 High power and high voltage transistor control circuit
06/16/1981US4274121 Target circuit for circuit breaker static trip unit
06/11/1981WO1981001632A1 Switching-typedistance relay apparatus
06/09/1981US4272816 Overcurrent protecting apparatus
06/09/1981US4272797 Fast recovery peak detector
06/09/1981US4272750 Power breaker apparatus
06/09/1981US4272717 Output capacitor discharge circuit
06/09/1981US4272708 Window lifter installation
06/09/1981US4272671 Temperature control system for electric surface heater
06/03/1981EP0029439A1 Method and apparatus for measuring and displaying the distance to an occured short circuit or similar line fault on an alternating current powerline
06/03/1981EP0006894B1 Protective circuit-breaker operated by leakage current
06/02/1981US4271449 Method and apparatus for protecting alternating current circuits
06/02/1981US4271446 Transient voltage suppression system
06/02/1981US4271444 Ground fault trip mode network for static trip circuit breakers
05/1981
05/26/1981CA1101924A1 Ground fault and fire detector system
05/20/1981EP0028613A1 Protection device or circuit for loudspeakers
05/19/1981US4268885 GFI Sensor circuit
05/19/1981US4268787 Electronic control for switching variable speed/variable voltage electric generator
05/19/1981CA1101533A1 Ground fault system with noise immunity
05/14/1981WO1981001349A1 Circuit for automatic discharge protection of a passive current source
05/12/1981CA1101067A1 Symmetrical component sequence filter
05/12/1981CA1101066A1 Proportional ground current relay
05/12/1981CA1101065A1 Apparatus for sensing a high phase signal from a multi-phase ac load circuit
05/06/1981EP0027858A1 Apparatus and method for use in a power supply connected to a load
05/06/1981EP0027843A1 Method and apparatus for protecting an electric motor
05/05/1981US4266259 Long-time and short-time overcurrent signal processor for circuit breaker static trip units
05/05/1981US4266145 Time dependent master reset
04/1981
04/29/1981EP0027757A1 Protective device for electric power line
04/29/1981EP0027495A1 Apparatus for generating a binary output signal of a Hall generator
04/21/1981US4263637 Ground fault receptacle
04/21/1981US4263635 Method and apparatus for sensing the clearance of fault current on an ac transmission line
04/21/1981US4263589 Devices for detecting the rupture of an electrical circuit element
04/21/1981CA1099782A1 Ground fault protective apparatus of field windings
04/15/1981EP0026801A1 Method of and apparatus for transmitting information about flow of fault current in a faulty section of an electric power transmission system
04/14/1981US4262319 Lightning arrester for use in gas insulated electrical power device
04/14/1981CA1099341A1 Circuit arrangement for detecting grounds in a static converter
04/08/1981EP0026620A1 Method and apparatus for identifying faults in electric power transmission systems
04/08/1981EP0026357A1 Fault current protection switch with a premagnetized core
04/08/1981EP0026356A1 Circuit arrangement, especially for multiple-pole fault current protection switches
04/08/1981EP0026355A1 Circuit arrangement for multiple-pole fault-current protection switches
04/08/1981EP0026354A1 Circuit arrangement for multiple-pole fault current protection switches
04/08/1981EP0026324A1 Electromedical stimulation-current device
04/08/1981EP0026297A1 Apparatus for sensing and locating shorts between a plurality n of electrical conductors
04/07/1981US4261038 Protection of electrical power supply systems
03/1981
03/31/1981US4259706 Solid state relay
03/31/1981US4258999 Power source voltage checking circuit
03/31/1981CA1098596A1 Amplifier malfunction detector
03/24/1981US4258403 Ground fault circuit interrupter
03/24/1981CA1098183A1 Low voltage welding circuit with non-conductive ground connector
03/17/1981CA1097775A2 Energy management system
03/17/1981CA1097740A1 Method and apparatus for detecting fault currents in electrical networks
03/17/1981CA1097731A1 Hazardous voltage protector for telephone line
03/11/1981EP0025022A1 Detector device for overcurrents and the loss of one or two phases
03/11/1981EP0024661A1 Enhanced protection power supply
03/10/1981US4255789 Microprocessor-based electronic engine control system
03/10/1981US4255774 Static instantaneous overcurrent relay with low transient overreach
03/10/1981US4255773 Ground fault interruptor
02/1981
02/17/1981US4251846 Apparatus for sensing short circuit faults in alternating current supply lines
02/17/1981US4251766 Method and apparatus for determining the direction of a fault on a power transmission line
02/17/1981CA1096072A1 Elevator system
02/10/1981US4250532 Electronic overcurrent detection and tripping circuit
02/04/1981EP0023290A1 Monitoring device of the voltage stress of an electrical device
02/04/1981EP0023277A1 Selective protection device
02/03/1981US4249124 Method and apparatus for monitoring faults by means of a polygonal trigger region
02/03/1981US4249089 Short-term power dropout arrangement useful in a television receiver
02/03/1981CA1095147A1 Testable protective system with redundant trip
01/1981
01/28/1981EP0023124A2 Power source device for bubble memory unit
01/27/1981US4247879 People protecting ground fault circuit breaker utilizing waveform characteristics
01/22/1981WO1981000159A1 Output voltage-drop detecting apparatus
01/21/1981EP0022582A1 Apparatus for short circuit protection of AC lines
01/21/1981EP0022496A1 Earth-fault monitoring for a multi-phase filter circuit
01/20/1981US4246623 Protective relay device
01/13/1981US4245150 Power line disturbance detector circuit
01/13/1981CA1093435A1 Metallurgical treatment using a glow discharge
01/07/1981EP0021288A1 Setting device for protective control system
01/06/1981US4244050 Dual voltage regulator with low voltage shutdown
01/06/1981US4243982 Current monitor
01/06/1981US4243920 Control device for monitoring machines driving revolving devices and method for operating the device
12/1980
12/30/1980US4242713 Triac output asymmetry detector
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