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)
12/1978
12/12/1978US4129893 Thermoelectric generator overload protective device using hysterisis control
12/12/1978CA1044313A1 Switching device for the protection of direct current devices
12/05/1978US4128806 Device for checking the insulation of the leads connecting a generator to a receiver
12/05/1978US4128805 Method and apparatus for locating a fault on a line
12/05/1978US4128804 Ground fault defeat cable for high current static trip circuit breaker test sets
11/1978
11/28/1978US4127888 Surge protector and test network for AC equipment
11/28/1978US4127854 Back-up and alarm circuit system
11/28/1978US4127743 Muting circuit for loudspeaker
11/21/1978US4126889 Protective circuit for d.c. circuit
11/21/1978CA1042983A1 Method for overvoltage protection of hvdc transmission line schemes
11/14/1978US4125884 Apparatus for detecting subsynchronous current in power systems
11/07/1978CA1042070A1 Transistor protective circuit with imminent failure sensing
10/1978
10/31/1978US4122854 Electrosurgical apparatus
10/31/1978CA1041606A1 Electronic overload detecting device
10/31/1978CA1041597A1 Two pole ground fault circuit protector
10/17/1978US4121271 Reverse power flow detector and control circuit
10/17/1978US4121269 Ground fault signal circuit for circuit breaker trip unit
10/17/1978CA1040706A1 Momentary power supply shutdown system
10/03/1978CA1039800A1 Ground fault protection for electrical power distribution systems
10/03/1978CA1039799A1 Protective circuit arrangement for a high-voltage capacitor bank
09/1978
09/26/1978US4117526 Undervoltage protection device
09/19/1978US4115829 Overcurrent and ground fault responsive trip unit for circuit breakers
09/19/1978US4115828 Arc detection and control apparatus
09/19/1978CA1038949A1 Motor protection apparatus and method
09/12/1978US4114089 Ground fault detecting apparatus including current-responsive threshold detection circuitry
09/12/1978US4114077 Rotor overtemperature protection for electric motors
08/1978
08/29/1978US4110821 Semiconductor device having a semiconductor accommodated in a sealed vessel
08/29/1978US4110809 Solid state power controller with low level signal control
08/29/1978US4110808 Ground fault protection system for multiple source distribution networks
08/29/1978CA1037554A1 Line surge protecting device for telephone lines
08/15/1978US4107778 Digital fault-location calculation system
08/15/1978US4107631 Protection of high-power coaxial cables
08/15/1978CA1036704A1 Overcurrent trip device
08/15/1978CA1036672A1 Cell balance detector for electrolytic cell assemblies
08/15/1978CA1036670A1 Ground fault detector circuit with high current inhibit
08/15/1978CA1036663A1 Current sensitive circuit protection system
08/08/1978US4106071 Apparatus for protection against subsynchronous currents in a power system
08/08/1978US4106070 Hazardous voltage protector for telephone line
08/08/1978US4106013 Electric power control system with load management programming
08/08/1978US4105965 Static trip circuit breaker test set
08/01/1978US4104691 Circuit breaker apparatus including asymmetrical fault detector
08/01/1978US4104689 Vacuum contactor protector
08/01/1978US4104687 Device for detecting unbalanced conditions in a polyphase equipment bank
08/01/1978US4104586 Apparatus for indicating the sequence of alternating current signals
08/01/1978US4104544 Current limiting circuit for direct current power supplies
07/1978
07/25/1978US4103317 Motor protector providing phase failure and overload cutoff for three-phase variable voltage variable frequency motor
07/18/1978US4101746 Apparatus for controlling the drive for hydraulically actuated high-voltage power circuit breakers
07/11/1978US4100587 Circuit for detecting the flow of an excess of reverse power from a load to a power system
07/11/1978US4100586 Tungsten lamp circuit for current limiting and fault indication
07/11/1978US4100428 Control system for limiting the electrical consumption of a distribution network
07/04/1978US4099215 Security apparatus for the protection of electric machines
07/04/1978US4099068 Power supply interruption detecting circuit
06/1978
06/27/1978US4097764 Fail-safe solid state logic
06/20/1978US4096560 Protection circuit to minimize the effects of power line interruptions on the contents of a volatile electronic memory
06/20/1978US4096542 Controller for video tape recorder
06/20/1978US4096541 Miniature lightning protector
06/20/1978US4096540 Protective relay circuit for regulated power supply
06/20/1978US4096395 Automatic transfer control device and voltage sensor
06/20/1978US4096366 Means for detecting a loss of vacuum in vacuum-type circuit interrupters used in polyphase a.c. vacuum circuit breaker
06/06/1978US4093977 Ground fault protective device
05/1978
05/30/1978US4092692 Overload protection circuit
05/30/1978US4092691 Protective relay arrangements
05/30/1978US4092690 Protective relay circuit providing a combined distance and overcurrent function
05/23/1978US4091434 Surge current protection circuit
05/23/1978US4091433 Protective relay circuit for interphase faults
05/23/1978US4091431 Ground leakage relay circuit
05/16/1978US4090228 Protective device for a system feeding a balanced load from a remote power supply
05/16/1978US4090227 Transient-protected signal distribution circuit
05/16/1978US4090090 Automatic transfer control device and frequency monitor
05/09/1978US4089033 High speed bus differential relay
05/09/1978US4088940 Device for cutting out loads in a generator and battery fed plant
05/09/1978US4088141 Fault circuit for stimulator
05/09/1978CA1031051A1 Electronic security circuit
05/02/1978US4087847 Solid-state electronic safety device
05/02/1978US4087846 Protective circuit apparatus
04/1978
04/25/1978US4086570 Controlled DC current supply device with open circuit detecting means
04/18/1978US4084406 Chiller controls
04/11/1978US4084205 Phase monitoring arrangement for a three phase network supplying a d.c. motor through a controlled converter
04/11/1978US4084204 Automatic recycle circuit
04/11/1978US4084203 Ground fault receptacle
03/1978
03/28/1978US4081854 Meter protection circuit
03/28/1978US4081853 Overcurrent protection system
03/28/1978US4081852 Ground fault circuit breaker
03/28/1978US4081851 Lightening protection circuit
03/21/1978US4080641 Ground fault detector
03/21/1978US4080640 People-protecting ground fault circuit interrupter
03/14/1978US4079435 Method of protecting power transmission lines and apparatus for realizing same
03/14/1978US4079434 Out-of-step relay
03/14/1978US4079433 Protective relaying apparatus for electric power systems
03/14/1978US4079326 Alternating voltage level detecting apparatus
02/1978
02/28/1978US4077056 Ground-fault circuit interrupter
02/28/1978US4077055 Ground fault protective device
02/28/1978US4076996 Power supplier for magnetron
02/21/1978US4075697 Apparatus for monitoring two electric quantities by combining three consecutive samples of each quantity
02/21/1978US4075674 Expandable electronic protection system
02/21/1978US4075673 Operating system for generator circuit-breakers
02/14/1978US4074335 Detecting circuit
02/07/1978US4073009 Apparatus for calculating amplitude values of sinusoidal waves
01/1978
01/31/1978US4071874 Hammer protection circuit
01/31/1978US4071873 Apparatus for detecting abnormal conditions of transmitted signals
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