A leakage current detection and interruption (LCDI) device for a power cord includes a switch module that controls an electrical connection of first and second power supply lines between input and an output ends; a leakage current detection module, including first and second leakage current detection lines, which respectively cover the first and second power supply lines, and are respectively configured to detect leakage current signals on the first and second power supply lines and to generate self-test fault signals in response to the first and second leakage current detection lines having an open circuit; and a drive module which receives the first and/or second leakage current signal and the first and/or second self-test fault signal, and drives the switch module to disconnect the electrical connection in response to these signals. The LCDI device can individually detect leaks on the two power supply lines and open circuit on the two leakage current detection lines.

An electronic equipment item for an electronic system, comprising a housing, a backplane board, at least one daughterboard and at least one lightning protection board housed in the housing. A connector is fixed to the backplane board and configured to be connected to the rest of the electronic system. For each daughterboard there is provided one lightning protection board. For each lightning protection board, a first port is arranged to connect the lightning protection board to the backplane board, and a second port is arranged to connect the daughterboard to the lightning protection board.

A power cord with leakage current detection and interruption (LCDI) function includes at least two power supply lines, at least two insulating layers respectively covering the at lease two power supply lines, at least two leakage current detection lines respectively disposed around the at least two insulating layers, including a first leakage current detection line and a second leakage current detection line, at least one connector line, electrically coupled to the first leakage current detection line and/or the second leakage current detection line, and at least one insulating structure, covering at least one of the at least two leakage current detection lines, to electrically insulate the first and second leakage current detection lines from each other.

An Ethernet power supply device is provided. The Ethernet power supply device includes a first switch, a second switch, and a processor. When the first switch detects that there is no adapter power supply, the first switch generates a first power supply according to a first network power from a first Ethernet network connector port. When the second switch detects that there is no adapter power supply, the second switch generates a second power supply according to a second network power from the second Ethernet network connector port. When there is no adapter power supply and the first power supply and the second power supply are at the same power level, the processor provides a first control signal to control the first switch to provide the first power supply to a power output terminal as an output power supply.

An Ethernet power supply device is provided. The Ethernet power supply device includes a first switch, a second switch, and a processor. When the first switch detects that there is no adapter power supply, the first switch generates a first power supply according to a first network power from a first Ethernet network connector port. When the second switch detects that there is no adapter power supply, the second switch generates a second power supply according to a second network power from the second Ethernet network connector port. When there is no adapter power supply and the first power supply and the second power supply are at the same power level, the processor provides a first control signal to control the first switch to provide the first power supply to a power output terminal as an output power supply.

This invention discloses a power electronic converter that streamlines the detection, monitoring, and protection of ground faults. The converter has at least one DC leg with each having a DC port and a first DC bus, at least one AC leg with each having an AC port and a second DC bus, at least one DC-bus capacitor, a ground-fault detection unit, and a Protective Earth terminal that is connected to the earth. The DC port(s). AC port(s), and the ground-fault detection unit are connected together to share a commons ground, which is also the neutral line of the AC ports. The first DC bus(es) of the DC port(s) and the second DC bus(es) of the AC port(s) are connected together to form a converter DC bus with the DC-bus capacitor(s) connected to it. The ground-fault detection unit, connected between the common ground and the Protective Earth terminal, consists of a current sensor and a neutral ground resistor connected in series, together with a voltage sensor to measure the voltage between the Protective Earth terminal and the common ground. When the voltage of the Protective Earth terminal with respect to the common ground exceeds a certain value or when the current flowing through the ground-fault detection unit exceeds a certain value, a visual or audio warning signal is generated to warn the presence of a ground fault. A Residual Current Circuit Breaker or a Ground Fault Circuit Breaker can be connected to the AC port(s) to disconnect the converter in case of ground faults. Possible applications include any field that adopts power electronic converters that converts electricity between DC and AC, e.g., in wind power, solar power, storage systems, home appliances, IT equipment, motor drives, electric vehicles, more-electric aircraft, and all-electric ships.

Disclosed is a method for determining the distance to a fault location of a power line to be protected in an electric power system, the method including: configuring the power line to be protected into a plurality of segments, obtaining a plurality of line settings separately for each of the plurality of segments configured, and using the line settings obtained to determine a fault location of the power line to be protected, wherein the line settings include at least one of impedance, resistance, reactance, length, compensation factor, angle. Also disclosed is an intelligent electronic device.

A solid state circuit breaker assembly includes a transistor, a transient voltage suppression device, and a circuit board. The transistor and/or the transient voltage suppression device may be electrically connected to the circuit board. The solid state circuit breaker module may be configured to be connected to one or more non-scalable modules to regulate current. The solid state circuit breaker module may be configured to receive one or more scalable modules. The transistor and/or the transient voltage suppression device may be disposed on the circuit board in a substantially symmetrical configuration.

A protective device includes a first fuse circuit, an overvoltage protection circuit, and a second fuse circuit. The first fuse circuit interrupts a flow of a line current from a voltage terminal to the electrical load when an intensity of the line current reaches a first current intensity limit value. The overvoltage protection circuit electrically connects poles of the voltage terminal when a first voltage limit value of a voltage is reached on the first fuse circuit to force the line current to reach the first current intensity limit value. The second fuse circuit activates the overvoltage protection circuit when a second voltage limit value of a voltage on the second fuse circuit is reached to electrically connect the poles of the voltage terminal. The second voltage limit value is based at least in part on a nominal voltage of the electrical load.

A protective device includes a first fuse circuit, an overvoltage protection circuit, and a second fuse circuit. The first fuse circuit interrupts a flow of a line current from a voltage terminal to the electrical load when an intensity of the line current reaches a first current intensity limit value. The overvoltage protection circuit electrically connects poles of the voltage terminal when a first voltage limit value of a voltage is reached on the first fuse circuit to force the line current to reach the first current intensity limit value. The second fuse circuit activates the overvoltage protection circuit when a second voltage limit value of a voltage on the second fuse circuit is reached to electrically connect the poles of the voltage terminal. The second voltage limit value is based at least in part on a nominal voltage of the electrical load.