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)
12/1980
12/30/1980US4242712 Over-power safety device for motor driven system
12/30/1980US4242638 Circuit for monitoring the square of the RMS value of a periodic signal
12/23/1980US4241410 Binary number generation
12/23/1980US4241372 Power supply protective circuit
12/23/1980US4241336 Method and apparatus for monitoring poly-phase currents in poly-phase equipment
12/16/1980US4240123 Power breaker system
12/11/1980WO1980002748A1 Method and apparatus for measuring and displaying the distance to an occured short circuit or similar line fault on an alternating current powerline
12/10/1980EP0020080A1 Improvements relating to earth leakage protection devices
12/10/1980EP0020073A1 Common suspension multi-line grounding protective relay
12/10/1980EP0020047A2 Method and apparatus for fault identification in electric power transmission systems
12/10/1980EP0019904A1 Overcurrent protective relais
12/09/1980US4238811 Three phase undervoltage monitor
12/09/1980US4238696 Failsafe electrical circuitry
12/09/1980CA1091307A1 Fail-safe solid state logic
12/09/1980CA1091162A1 Temperature insensitive dc voltage detection and protection circuit
12/02/1980US4237512 Differential protection circuitry for electrical devices
12/02/1980US4237511 Selective protection process for electrical lines and device for carrying out the process
12/02/1980CA1090912A1 Circuit breaker apparatus including asymmetrical fault detector
12/02/1980CA1090860A1 Electric pipe thawing apparatus with current sensing means
11/1980
11/26/1980EP0019222A1 Circuit for electrically connecting a volatile memory to a power supply input terminal
11/25/1980US4236186 Power breaker system
11/25/1980CA1090430A1 Digital signal selective circuit
11/18/1980US4234904 Process and device for the protection of electrical energy supply systems controlled by means of audio-frequency
11/18/1980US4234901 Protective relay apparatus
11/18/1980US4234900 Ground fault detector
11/13/1980WO1980002477A1 Protection device or circuit for loudspeakers
11/12/1980EP0018867A2 Protected electric power supply comprising a thyristor
11/12/1980EP0018502A1 Process and installation for the homogeneous-radiation air conditioning of a space, closed on all sides, especially of a tepidarium
11/11/1980US4233640 Ground fault apparatus and protection system
11/11/1980US4233639 Apparatus and system for protecting power distribution circuits against ground faults
11/11/1980CA1089529A1 Rotor overtemperature protection for electric motors
11/04/1980US4232351 High-voltage crowbar circuit with cascade-triggered series ignitrons
11/04/1980US4232267 Digital signal selective circuit
11/04/1980US4232232 Voltage sensing and load measuring automatic reclosing system for D-C circuit breakers
11/04/1980US4231372 Safety monitoring circuit for electrosurgical unit
11/04/1980CA1089073A1 Solid state inverse overcurrent relay
10/1980
10/28/1980US4231074 Zero sequence current source for transformer having a nonwound tertiary
10/28/1980US4231029 Automatic transfer control device and frequency monitor
10/28/1980US4230982 Process and device for short-circuit monitoring of electrical lines
10/14/1980US4228477 Circuit for monitoring the current distribution in parallel-connected converted branches
10/14/1980US4228476 Protective relaying system
10/14/1980US4228398 Method of testing distance relays
10/14/1980CA1087708A1 Protection system for electric motor
10/14/1980CA1087679A1 Line protector for communications circuit
10/14/1980CA1087677A1 Electrical protection circuits
10/07/1980US4227232 Clutch protection circuit
10/01/1980EP0016458A1 Earth fault circuit breaker responding also to direct fault currents
10/01/1980EP0016038A1 Method and apparatus for detecting faults in an electric power distribution system
09/1980
09/30/1980US4225795 Coincidence circuit for a protective relay circuit
09/30/1980US4225793 Arrangement for monitoring a current network
09/30/1980CA1086825A1 Device for detecting unbalanced conditions in a polyphase equipment bank
09/30/1980CA1086817A1 Compressed gas filled circuit breaker
09/23/1980US4224652 Method and apparatus for detecting ground shorts in the rotor circuit of a generator
09/23/1980CA1086420A1 Networks for limiting x-radiation from cathode ray tubes
09/23/1980CA1086375A1 High speed fault diverter switch for gas-insulated systems
09/17/1980EP0015864A1 Circuit for the determination of the reactance of a power transmission line in the case of a short circuit
09/17/1980EP0015259A1 Process and device for detecting the position of a fault in an electric connection.
09/16/1980US4223365 Auto resetting switchgear trip indicator circuits
09/16/1980US4223232 Battery charging circuit for an emergency system
09/16/1980CA1085953A1 Modified offset keying apparatus for phase comparison relaying
09/16/1980CA1085952A1 Unsupervised trip keying for phase comparison relaying apparatus
09/16/1980CA1085741A1 Muting circuit for loudspeaker
09/09/1980US4222087 Passive triac output asymmetry detector
09/09/1980US4222086 Overcurrent control device with fail-safe circuits
09/09/1980US4222085 Method and apparatus for the distance-selective fault monitoring of electrical lines
09/09/1980CA1085450A1 Voltage surge protector
09/03/1980EP0015226A2 Circuitry for memorizing the phase position of an alternating voltage
09/03/1980EP0014938A1 Method of watching conducting currents with respect to a fault current and arrangement for carrying out this method
09/03/1980EP0014757A1 Power line fault detector circuit
09/02/1980US4220900 Motor control system for a linearly reciprocating load device such as automotive vehicle closure including sun roof
09/02/1980US4220088 Static-resistant electric initiator
09/02/1980CA1085039A1 Static trip unit for circuit protective devices
08/1980
08/26/1980US4219860 Overcurrent relay apparatus
08/26/1980US4219859 Multiple range inverse time overcurrent relay
08/26/1980US4219858 Overcurrent relay apparatus
08/26/1980US4219856 Protective device for capacitor bank
08/26/1980US4219784 Phase detection system using sample and hold technique, and phase locked loop using such phase detection system
08/21/1980WO1980001742A1 Interphase unbalance detector for ac load circuit
08/19/1980US4218719 Reverse power flow detector and control circuit
08/19/1980US4218718 Protective relay apparatus
08/19/1980US4218648 Arrangement for reducing no-load current in an energized transformer
08/12/1980CA1083673A1 Device for checking the insulation of the leads connecting a generator to a receiver
08/12/1980CA1083672A1 Ground fault detector
08/05/1980US4216516 Portable ground fault protector
08/05/1980US4216515 Ground fault interrupter
07/1980
07/29/1980CA1082776A1 Apparatus for monitoring an a-c variable
07/22/1980US4214311 Method and apparatus for measuring insulation resistance
07/15/1980CA1081779A1 Overvoltage protection circuit using photoswitches
07/15/1980CA1081741A1 Capacitively coupled indicator for a submersible fuse
07/09/1980EP0012961A1 Device for the determination of faults in electric distribution networks influencing the frequency and application of such a device for frequency regulation in said networks
07/08/1980US4212046 Distance relaying systems
07/01/1980US4210948 Method and apparatus for monitoring line voltage in a polyphase source
07/01/1980US4210906 Transient suppression and detection system with operational indicator means
07/01/1980CA1080842A1 Protection circuits
07/01/1980CA1080772A1 Current flow direction responsive fuse comprising a peltier effect element in series with fuse element
06/1980
06/24/1980US4209818 Circuit breaker having an electronic fault sensing and trip initiating unit
06/17/1980US4208693 Circuit breaker having an electronic fault sensing and trip initiating unit
06/17/1980US4208692 Method and apparatus for detecting fault currents in electrical networks
06/17/1980US4208690 Circuit breaker having an electronic fault sensing and trip initiating unit
06/17/1980US4208689 Circuit breaker having an electronic fault sensing and trip initiating unit
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