Provided is an apparatus for determining an abnormal status of a wireless power transmission coil, the apparatus including an input-current sensor configured to detect an input current and provided at an input side of a power transmission coil, an output-current sensor configured to detect an output current and provided at an output side of the transmission coil, and a controller configured to compare each of the input current and the output current with a predetermined threshold value corresponding thereto to determine whether a disconnection or a short circuit occurs in the transmission coil.

An electric power equipment comprises: a display module; a sensor module for outputting measurement data including a first noise signal measured from inside of the electric power equipment, a second noise signal measured from outside of the electric power equipment, a temperature signal of the electric power equipment, and a humidity signal of the electric power equipment; and a control module for diagnosing whether a partial discharge has occurred based on the measurement data, wherein the control module includes: a determination unit for determining whether a signal magnitude of the first noise signal is within a preset first reference range; an analysis unit for diagnosing an occurrence of the partial discharge, and for analyzing the signals according to the analysis algorithm; and a control unit for controlling a result information of the analyzing, and a maintenance and repair information, to be displayed.

A method for detecting radial deformation in a winding of a transformer may include synthetic aperture radar (SAR) imaging of the winding using ultra high frequency (UHF) electromagnetic signals in a first instance of the winding to obtain a first image of the winding; SAR imaging of the winding using UHF electromagnetic signals in a second instance of the winding to obtain a second image of the winding; and comparing the first image of the winding and the second image of the winding to detect a radial deformation in the winding. The UHF electromagnetic signals may be transmitted as a plurality of successive sinusoidal signals, where frequencies of the successive sinusoidal signals gradually change from a first frequency to a second frequency.

Phase selection for traveling wave fault detection systems is disclosed herein. Intelligent electronic devices (IEDs) may be used to monitor and protect electric power delivery systems by detecting and acting upon traveling waves. A phase of the electric power delivery system may be selected based on the relative polarity of the traveling waves detected. The amplitude and/or polarity of the selected phase may be compared with the amplitudes and/or polarities of the other phases to determine a fault condition. For instance, the IED may determine a single-phase-to-ground fault based on the relative polarities and magnitudes of the detected traveling waves, send a protective action to the identified faulted phase, and/or continue to monitor the system for a continuation of the event or identification of a different event, such as a three-phase fault, using incremental quantities.

Systems (100), power modules (108), and methods for using in controlling a converter (110) coupled between a power generator (104) and an electric grid (102). A power module (108) includes the converter (110) configured to supply the output from the power generator (104) to the electric grid (102) and a controller (112) coupled to the converter (110) and configured to disable the converter (110) in response to a grid fault event, to identify the type or the grid fault event after a first predetermined interval from disabling the converter (110), and to enable switching of the converter (110), when the type of the grid fault event is identified as a low voltage condition.

An earphone connection interface is provided. The earphone connection interface includes a first detector disposed at a first area to detect an electrical change according to a contact state of the first area, and a second detector disposed at a second area different from the first area to detect an electrical change according to a contact state of the second area.

A system for detecting faults in an electric vehicle charging system includes an electric vehicle supply equipment (EVSE) coupled to an electric vehicle via a cable. The EVSE includes a first charging circuit interrupting device (CCID) configured to detect faults at let-go levels between an ungrounded conductor in the cable and an external (or unintended) ground. The first CCID is also configured to detect faults above leakage current levels between a chassis of the vehicle and a power storage device of the vehicle. A second CCID is included in the cable or the vehicle to detect faults at let-go levels between an ungrounded conductor in the cable and the chassis. The system maintains grounding continuity between the electric vehicle and ground. The system thus provides protection at let-go levels while allowing a leakage current in the vehicle to be detected at a higher level for nuisance trip avoidance.

A mechanical fault indicator of the automatic reset includes the core, the dial, the lock, the indicating rods, and the shell. The core includes the clip-on core, fixed core, connecting core and movable iron core. The pointer includes the indicating axis of rotation, the pointer connection and the indicating rod. The lock includes the lock axis of rotation, the lock hook and balancing weight. When using the indicator, clip the wire of the transmission line into the two-part clip-on core. When a short circuit fault happens, the indicating rod falls out of the housing, of which the action indicates failure. When the circuit is back to normal, the indicating rod resets automatically. The indicator has the advantages of: low cost, long service life, purely mechanical, no circuit and battery, and the installation is simple and convenient.

A solderless test fixture, including a conductive base, a clamp, and a connector is described. The conductive base has at least one cable groove with a cable grounding portion. A clamp is mounted on the base and associated with the cable groove. A connector is associated with the cable groove and has a solderless center terminal aligned with the cable groove and an outer shield being mechanically and electrically connected to the base.

At least some embodiments of disclosure include a method and device for grounding adjustment. The method includes: acquiring a grounding parameter of a port to be detected of a terminal, wherein the grounding parameter is reflective of a grounding state of the port to be detected; when the grounding parameter exceeds a predetermined threshold, determining that the grounding state of the port to be detected does not meet a preset requirement; and adjusting the port to be detected not meeting the preset requirement according to a reason why the grounding state does not meet the preset requirement.