The present disclosure relates to a coaxial lead structure and method for radiating a GIS partial discharge UHF signal outward. The structure includes a GIS cavity, a circular hole provided on the GIS cavity, a medium cylinder provided at the circular hole and sealing the circular hole, a thin cylindrical metal lead that extends into and is fixed to the medium cylinder, and a ground lead connected to the thin cylindrical metal lead. According to the present disclosure, a relatively strong signal may be obtained outside a coaxial lead structure, and detection of a partial discharge UHF signal at this position may increase the detection sensitivity by one time compared with the detection methods of built-in and external disc insulators.

A protection device configured for being electrically connected to a test tap of a HV bushing for protecting the bushing from transient overvoltages. The protection device includes at least two parallel connected protection branches connected between the test tap and a ground connector configured for connecting to ground. Each of the protection branches includes a plurality of parallel connected gas discharge tubes, a Transient-Voltage-Suppression (TVS) diode connected in series with the gas discharge tubes, and a resistor connected in series with the gas discharge tubes and across the TVS diode.

An approach to detecting partial discharge events involves retrofitting an electrical system to include a capacitive sensor configured to capacitively sense partial discharge events of a component of the electrical system. The capacitive sensor has a first electrical conductor that forms a first terminal of the capacitive sensor, a second electrical conductor that forms a second terminal of the capacitive sensor, and a dielectric that separates the first electrical conductor and the second electrical conductor. The capacitive sensor generates an electrical sensor signal at an output of the capacitive sensor in response to the partial discharge event. The electrical sensor signal is converted to an optical signal and the optical signal is processed to detect an occurrence of the partial discharge event.

A method of predicting a lifetime of a gas filling of an electrical switchgear is disclosed, wherein pressure values p.sub.1, p.sub.2 in a system of the electrical switchgear containing the gas filling at a predefined temperature T.sub.p at different points in time t.sub.1, t.sub.2 are measured. Based on the pressure difference Δp between the pressure values p.sub.1, p.sub.2 the lifetime of the gas filling is calculated. Alternatively, the pressure values p.sub.1, p.sub.2 can be taken at temperatures T.sub.1, T.sub.2 within a predefined temperature range at different points in time t.sub.1, t.sub.2.

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 identifying one or more simultaneously occurring partial discharge sources from partial discharge measurement signals of an electrical device to which an AC voltage is applied includes determining area parameters of at least one enclosed area of partial discharge pulse matrix arrays. For each enclosed area of partial discharge pulse matrix arrays, area parameters of the enclosed area of partial discharge pulse matrix arrays are compared to predetermined rule sets. Predetermined fault rules are applied which allocate characteristic partial discharge pulse area basic forms and characteristic combinations of partial discharge pulse area basic forms to known partial discharge sources, to the ascertained partial discharge pulse area basic forms in order to determine those partial discharge sources which have rendered the corresponding partial discharge pulses.

An arc treatment device includes an arc detector operable to detect whether an arc is present in a plasma chamber, an arc energy determiner operable to determine an arc energy value based on an energy supplied to the plasma chamber while the arc is present in the plasma chamber, and a break time determiner operable to determine a break time based on the determined arc energy value.

A partial discharge (PD) detection apparatus for gas-insulated equipment includes a photon collector, an optical splitter, a first photoelectric conversion module, an ultraviolet fluorescent crystal, a second photoelectric conversion module, and a signal processing module, where the ultraviolet fluorescent crystal is configured to convert a second optical radiation signal into an optical radiation signal of an ultraviolet fluorescence band, and the signal processing module is configured to calculate first apparent intensity based on a first voltage signal output by the first photoelectric conversion module, calculate second apparent intensity based on a second voltage signal output by the second photoelectric conversion module, and determine discharge intensity of the optical radiation based on a ratio of the second apparent intensity to the first apparent intensity. Technical solutions of the present disclosure are not affected by an unknown distance between a discharge position and a detection point.

The present invention relates to a device for detecting a partial discharge for a power transformer which detects an electromagnetic signal occurring due to faulty insulation. The device includes an antenna unit receiving electromagnetic waves, an insulator including the antenna unit, a metallic air-tight unit that seals a connector connected to the insulator and connecting a coaxial cable, and the coaxial cable exposed to the outside of the metallic air-tight unit. Thus, it is possible to enhance broadband properties through an internal conductor of a drain valve.

A method and arrangement for detecting partial discharges in an electric operating device, wherein electromagnetic pulses are detected by means of a sensor device, a narrow frequency band from a frequency spectrum of the electromagnetic pulses is selected by a filter device, the narrow frequency band is amplified by an amplifier device, and signals contained in the narrow frequency band are compared with a threshold value for the amplitude by an evaluation device, wherein a partial discharge is identified in the event that the threshold value is exceeded.