A system and method for persistent monitoring, detecting, and mitigating detecting and isolating a high-altitude electromagnetic pulse (“HEMP”) along electrical lines electrically connected to a monitored infrastructure so as to protect the monitored infrastructure, the method including a phase unit receiving sensor signals from a plurality of analog sensor circuits electrically connected to each of the electrical lines, respectively, upstream of and associated with the monitored infrastructure. The method includes determining, limiting, shunting, and limiting the impinged transient surges and instantaneously indicates locally the status of the monitored parameters using visual and audio sound via a cybersecure optical communication channel supporting a plurality of wavelengths, from which one wavelength is utilized for a one-directional communication and a different wavelength optical signal establishing a controlled temporary two-directional communication for surge protection system maintenance and update.

A filter network is insertable into a power transmission line, to handle disturbances in the power transmission line. A first circuit has an RC network in parallel with a surge arrestor, to bypass high frequency disturbances of the power transmission line. A second circuit has inductors for carrying low-frequency power to and from impedance injection units.

Disclosed are a household appliance, an apparatus and a method for detecting an arc fault in the household appliance. The apparatus includes: a grid current detecting unit, configured to detect a current from a power grid to the household appliance so as to generate a first current detecting signal; a filter protecting unit, configured to perform an attenuation processing on an arc signal in the power grid; a load current detecting unit, configured to detect an actual running current in a load of the household appliance so as to generate a second current detecting signal; and a control unit connected to the grid current detecting unit and the load current detecting unit respectively, and configured to identify and compare the first current detecting signal and second current detecting signal so as to determine a source of the arc fault.

A circuit includes a detector and controller circuit configured to detect a high field RF (radio frequency) electromagnetic fields indicating a potential of an electromagnetic pulse event capable of damaging electrical equipment connected to a power grid. The circuit also includes controller receiving an input from the detector circuit, the controller being included within a shielded enclosure and configured to initiate an event in response to detection of the high field electromagnetic pulse field to remove the electrical equipment from the power grid.

A system and method for suppressing EMP-induced voltage surges due to detonation of a nuclear weapon at high altitude generating an EMP (HEMP) comprising E1, E2, and E3 component pulses. A plurality of shunting assemblies, each including transient voltage suppressors (TVSs), metal oxide varistors (MOVs), gas discharge tubes (GDTs), other mechanical, electrical and ionization discharge devices (IDDs) and combinations thereof of surge limiting technologies, are positioned intermediate a signal stream and a plurality of electronic device ports associated with a plurality of communication channels for sensing upstream of the communication channels an overvoltage associated with each of the E1, E2, and E3 components of the EMP and shunting the over-voltages to predetermined allowable levels within the predetermined time.

A transient voltage suppressor (“TVS”) device includes a housing. Three prongs extend from the first end and are adapted for electrically connecting to an alternating current power source receptacle. Three recessed contacts extend into the second end of the housing for receiving three prongs from a power connector. The three prongs and three recessed contacts are adapted to pass electrical power along a ground wire, a neutral wire, and line wire, respectively. A protection circuit includes at least one silicon avalanche suppression diode (“SAS diode”) to limit high transient voltage imposed thereon to a lower level. A notification circuit is configured to communicate a status of the TVS device and configured to notify a user of one or more of: a correct connection of the vehicle wiring with respect to the power source, an incorrect connection of the vehicle wiring with respect to the power source, or a fault.

A current transient suppression circuit includes an inductor electrically connected to a test signal by an input of the inductor, at least one switching device electrically connected to an output of the inductor, and an output of the at least one switching device connected to a shunt path. A method of suppressing current transients in a circuit includes receiving a test signal at an inductor, and when the test signal comprises a current transient, the current transient is received at the inductor, activating at least one switching device electrically connected to the inductor to shunt the current transient away from a device under test.

A clamp circuit including a power dissipation circuit having at least one transistor and a resistor which dissipates power from the surge across the resistor and the transistor by turning on the at least one transistor and forming a voltage divider between a source impedance and the resistor thereof disposed in series with a channel of the transistor; and the resistor holding a portion of transient pulse seen by the load to a low voltage and adding of the low voltage to a threshold voltage of the transistor; and a sub-circuit which tests a functionality of the power dissipation circuit.

A system and method for suppressing EMP-induced voltage surges due to detonation of a nuclear weapon at high altitude generating an EMP (HEMP) comprising E1, E2, and E3 component pulses. A plurality of shunting assemblies, each including transient voltage suppressors (TVSs), metal oxide varistors (MOVs), gas discharge tubes (GDTs), other mechanical, electrical and ionization discharge devices (IDDs) and combinations thereof of surge limiting technologies, are positioned intermediate a signal stream and a plurality of electronic device ports associated with a plurality of communication channels for sensing upstream of the communication channels an overvoltage associated with each of the E1, E2, and E3 components of the EMP and shunting the over-voltages to predetermined allowable levels within the predetermined time.

Power delivery may be controlled to help prevent arcing when a data cable supplying power from a power source device to a power sink device is disconnected. The presence of a user in proximity to a connection between a cable plug and a cable receptacle may be detected. The level of a power signal being conveyed from the power source to the power sink may be reduced in response to the detection.