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)
10/1984
10/16/1984US4477768 Leakage current detecting structure
10/10/1984EP0120887A1 Timing controller for a recloser relay
10/09/1984US4476511 Circuit interrupter with front panel numeric display
10/03/1984EP0120209A2 Method of detecting frequency in power system
10/02/1984US4475094 Circuit control device
10/02/1984CA1175487A1 Means for sensing the ratio between the line voltage and the frequency of an a.c. network
09/1984
09/26/1984EP0119744A1 Relay for pilot protection of electrical power lines
09/26/1984EP0119214A1 Test circuit for fault current protection circuits
09/25/1984US4473856 Overcurrent protection apparatus for DC motor
09/25/1984US4473759 Power sensing circuit and method
09/25/1984CA1175107A1 Device for detecting faulty phases in a multi-phase electrical network
09/19/1984EP0119187A1 Power supply system
09/19/1984EP0119159A1 Circuit with a switching transistor
09/19/1984EP0119042A1 Protective relay system
09/19/1984EP0118785A1 Two-pole overcurrent protection
09/11/1984US4471401 Secondary arc extinction device
09/05/1984EP0117421A1 Process and apparatus for measuring weak noise frequency signals in a polyphase power transmission line
09/04/1984US4470093 Protective relay system and sampling synchronizing method therefor
09/04/1984US4470092 Programmable motor protector
09/04/1984US4470091 Productive relay apparatus for protection from sub-synchronous current oscillations in a power system
08/1984
08/28/1984US4468796 Frequency relay for use in the protection of electric power transmission lines
08/28/1984CA1173492A1 Gapless discharge counter for lightning arresters
08/22/1984EP0116105A1 Domestic power line breaker
08/16/1984WO1984003182A1 A fault protection system for power supplies that use ferro-resonant transformers
08/15/1984EP0115733A1 Process for measuring the intensity in relation to a nominal intensity of an alternating current, and electronic circuit therefor
08/14/1984US4466071 High impedance fault detection apparatus and method
08/14/1984US4466041 Fault protection system for power supplies that use ferro-resonant transformers
08/08/1984EP0115017A1 Method and system for identifying the direction of a fault
08/08/1984EP0115002A2 Voltage transient protection circuit
08/07/1984US4464698 Protective relay
08/07/1984US4464697 Protective relay system
08/01/1984EP0114292A1 Three-phase power supply unit
07/1984
07/31/1984US4463401 Interface circuit apparatus
07/24/1984US4461987 Current sensing circuit for motor controls
07/11/1984EP0113026A1 Earth leakage circuit breaker
07/10/1984US4459630 Excess current protection circuit for a power supply
07/10/1984US4459545 Apparatus for detecting a current peak value and a voltage peak value
07/03/1984US4458285 Method and device for finding faults on electric lines by the principle of low impedance
07/03/1984US4458283 Static protective relay
06/1984
06/26/1984US4456867 Motor control apparatus with input validator
06/19/1984US4455612 Recursive estimation in digital distance relaying system
06/19/1984US4455012 Remotely controlled valve
06/19/1984CA1169537A1 Circuit interrupter with solid state digital trip unit
06/19/1984CA1169536A1 Circuit interrupter with solid state digital trip unit and positive power-up feature
06/19/1984CA1169534A1 Circuit interrupter with overtemperature trip device
06/19/1984CA1169458A1 Equipment for the homogeneous radiant conditioning of a room enclosure for therapeutic purposes
06/13/1984EP0110070A1 Installation protection switch
06/12/1984US4454556 Timing controller for a recloser relay
06/12/1984US4454555 Voltage sensing and load measuring automatic reclosing system for d-c circuit breakers
06/05/1984US4453192 Protective device for three phase inductances
06/05/1984US4453191 Overvoltage directional relay
06/05/1984CA1168746A1 Overcurrent relay circuit
05/1984
05/30/1984EP0109629A1 Current ratio-differential relay
05/29/1984US4451866 Metal structure grounding safety system
05/22/1984US4450497 Ultra-high-speed relay
05/22/1984US4450496 Protection of certain electrical systems by use of PTC device
05/22/1984CA1167910A1 Motor protection device
05/22/1984CA1167907A1 Frequency relay for use in the protection of electric power transmission lines
05/16/1984EP0108726A1 A control circuit for a differential switch
05/16/1984EP0015924B1 Circuit breaker having an electronic fault sensing and trip initiating unit
05/15/1984US4449177 Discharging circuit for power source device with rectifier circuit
05/09/1984EP0107996A1 Electronic counter for measuring active and reactive energy in a three-phase power system
05/08/1984US4447846 Computer environment protector
05/08/1984US4447845 Reactance relay
05/08/1984US4447843 Negative sequence network having a frequency compensated filter
05/08/1984CA1167102A1 D.c. switch circuit
05/01/1984US4446501 Circuit control system
05/01/1984US4446500 Remote control circuit breaker circuit
05/01/1984US4446498 Electronic control system for overload relay or the like
05/01/1984CA1166681A1 Mine vehicle safety apparatus
04/1984
04/25/1984EP0106045A1 Earth leakage circuit breaker
04/24/1984US4445183 Electrical switch
04/24/1984CA1166310A1 A.c. electricity power supply system and methods of and apparatus for load control thereon
04/18/1984EP0105816A1 Device for automatically grounding structures accidentally being under tension
04/17/1984US4443854 Current sensor responsive to symmetrical and asymmetrical currents and current limiting protector utilizing same
04/17/1984US4443828 Low voltage circuit breaker
04/12/1984WO1984001474A1 Timing controller for a recloser relay
04/10/1984US4442472 Solid state trip circuit with digital timer
04/10/1984US4442470 Ground fault receptacle with arrangement for protecting internal electronics
04/10/1984CA1165396A1 Self-calibrating overcurrent detector
04/03/1984US4441135 Three-phase power transmission line phase-to-ground fault responder
04/03/1984US4441134 Circuit breakers sensitive to leakage currents
03/1984
03/27/1984US4439805 For use with a magnetic tape unit
03/27/1984US4439803 Power interruption device
03/20/1984US4438476 Selectable integrating characteristic timer for protective relays
03/20/1984CA1164081A1 Ground fault circuit interrupting device with improved thyristor triggering
03/15/1984WO1984001033A1 Test circuit for fault current protection circuits
03/14/1984EP0102710A1 Protective relay system
03/14/1984EP0102666A2 Method and apparatus for monitoring and protecting a semiconductor output device
03/14/1984EP0102623A1 A current sensing circuit for motor controls
03/13/1984US4436986 Electric blanket safety circuit
02/1984
02/28/1984CA1162982A1 Intrinsically safe electrostatic assist units
02/21/1984US4433353 Positive sequence undervoltage distance relay
02/21/1984CA1162632A1 Circuit interrupter with front panel numeric display
02/15/1984EP0012754B1 Circuit breaker having an electronic fault sensing and trip initiating unit
02/14/1984US4432031 Method for overcurrent protection
02/14/1984US4432030 Short circuit protection system
02/08/1984EP0100173A1 Monitor for signal quality in a protective relay system
02/07/1984US4430683 Ground fault detecting device for use with a DC circuit
02/07/1984US4430554 Electrical safety device for heaters with a high current consumption
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