A high accuracy open phase detection system for power transformers that uses a combination of logic controllers and current transformers to recognize an open phase condition experienced by the power transformers under no load, light load, and full load conditions. A current to voltage and current to current transformer on each phase are employed to detect the excitation current and load current conditions. During an open phase condition, a microprocessor detecting device, connected to the current to voltage and current to current transformers, monitors the appropriate power system quantities to determine the existence of one or more open phase(s) with or without a ground or an open phase with line charging capacitance. Through the microprocessor monitor, the microprocessor detecting device can alert operators to the loss of phase or abnormal conditions in the power source. The data used by the microprocessors can be used to calculate the magnitude and phase angle of the current in the power source and detect abnormal system conditions. This invention also employs a unique circuitry configuration to reduce the effects of ambient noise on the open phase detection system.

A superconducting magnet device including a superconducting coil formed of a high-temperature superconducting wire, a power supply which supplies current to the superconducting coil, and a protector capable of forming a short-circuit path which short-circuits both ends of the superconducting coil to each other is installed. Current is made to flow from the power supply to the superconducting coil in a superconducting state, and the superconducting coil thereby generates a magnetic field. After the magnetic field is generated, when an abnormality of the superconducting magnet device is detected, or when the power supply and the superconducting coil are disconnected from each other, the short-circuit path is formed by the protector.

A superconducting magnet device including a superconducting coil formed of a high-temperature superconducting wire, a power supply which supplies current to the superconducting coil, and a protector capable of forming a short-circuit path which short-circuits both ends of the superconducting coil to each other is installed. Current is made to flow from the power supply to the superconducting coil in a superconducting state, and the superconducting coil thereby generates a magnetic field. After the magnetic field is generated, when an abnormality of the superconducting magnet device is detected, or when the power supply and the superconducting coil are disconnected from each other, the short-circuit path is formed by the protector.

A system for actively detecting an alternating current (AC) load includes a first power interface, a second power interface, a switch unit, and a control unit. The first power interface is coupled to an AC source to receive and provide an AC voltage. The second power interface is configured to be coupled to an electronic equipment to provide the AC source to the electronic equipment and provide a connection signal according to whether the electronic equipment is coupled to the second power interface. The switch unit is coupled between the first power interface and the second power interface and receives a switch signal to determine whether the AC voltage is transmitted to the second power interface. The control unit is coupled to the second power interface and the switch unit to provide the switch signal according to the connection signal.

The present disclosure relates to a hot-plug protection method and a power supply device. The method includes, when the connection status between the power supply device and the to-be-charged device is detected as disconnected through the detection pin, turning off a switch assembly within a first time period, where the switch assembly is connected in series between the voltage converter of the power supply device and the connection port, and maintaining an output voltage of the voltage converter at a first level within a second time period, the first time period being shorter than the second time period.

The present disclosure relates to a hot-plug protection method and a power supply device. The method includes, when the connection status between the power supply device and the to-be-charged device is detected as disconnected through the detection pin, turning off a switch assembly within a first time period, where the switch assembly is connected in series between the voltage converter of the power supply device and the connection port, and maintaining an output voltage of the voltage converter at a first level within a second time period, the first time period being shorter than the second time period.

A power distribution monitoring system (100) is provided that can include a number of features. The system can include a plurality of monitoring devices configured to attach to conductor(s) on a power grid distribution network. In some embodiments, a monitoring device is disposed on each conductor of a three-phase network and utilizes a complex platform of software and hardware to detect faults and disturbances that can be analyzed to determine or predict the risk of wildfires.

A power distribution monitoring system (100) is provided that can include a number of features. The system can include a plurality of monitoring devices configured to attach to conductor(s) on a power grid distribution network. In some embodiments, a monitoring device is disposed on each conductor of a three-phase network and utilizes a complex platform of software and hardware to detect faults and disturbances that can be analyzed to determine or predict the risk of wildfires.

A power loss protection circuit includes: a first input terminal configured to receive, as an input voltage, a voltage generated by an intermediate bus converter configured to step down a DC bus voltage; a second input terminal configured to receive the DC bus voltage; a capacitor connection terminal to which an external capacitor is to be connected; an output terminal to which a load is to be connected; a first switch connected between the first input terminal and the output terminal; a charging circuit connected between the second input terminal and the capacitor connection terminal; and an internal converter configured to step down a voltage of the capacitor connection terminal and stabilize an output voltage generated at the output terminal to a target level.

A power loss protection circuit includes: a first input terminal configured to receive, as an input voltage, a voltage generated by an intermediate bus converter configured to step down a DC bus voltage; a second input terminal configured to receive the DC bus voltage; a capacitor connection terminal to which an external capacitor is to be connected; an output terminal to which a load is to be connected; a first switch connected between the first input terminal and the output terminal; a charging circuit connected between the second input terminal and the capacitor connection terminal; and an internal converter configured to step down a voltage of the capacitor connection terminal and stabilize an output voltage generated at the output terminal to a target level.