A penetration terminal for connecting the coaxial cables inside and outside of the apparatus thereto is attached on the electric apparatus' frame, and the measurement of a combined capacitance of the antenna and the coaxial cable in the inner side of the apparatus is made possible from the outer side of the apparatus, so that it is possible to perform at any time the determination whether a wiring connection of the antenna mounted in the inner side of the electric apparatus is appropriate.

An ultra-high frequency (UHF) partial discharge detection sensor having a leak-tight structure, includes a flange portion having a through hole formed therein, an electrode rod inserted through the through hole formed in the flange portion, a sensor unit provided at an upper end of the electrode rod to detect partial discharge ultra-high frequency, a sealing member provided between the electrode rod and the flange portion, and a cover member supporting a lower end of the sealing member.

Exemplary embodiments of the present disclosure are directed to resonant transformers (or reactors) and coil arrangements associated with resonant transformers. The coil arrangements can include a grounding coil configured to generate a net-zero induced voltage between a first end of the grounding coil and a second end of the grounding coil layer, and one or more step-up coil layers formed by one or more layers of pressure tape, insulating materials, and wire wrapped to form coils about a portions of a split magnetic core. The split magnetic core can include a first core segment and a second core segment, where one of the core segments is disposed within a main housing and one of the core segments is disposed external to the main housing. A gap between the first and second core segments can be manipulated to control an inductance of the resonant transformer.

A testing device for propagation characteristic of electromagnetic wave in gas insulated switchgear includes an ultrahigh frequency signal generator, a GIS testing chamber, an emitting antenna and a receiving antenna which are provided inside the GIS testing chamber. A detachable disc insulator is provided between the emitting antenna and the receiving antenna. Both terminals of a GIS testing chamber are sealed by polyurethane wave-absorbing sponge; the ultrahigh frequency signal generator is connected with the emitting antenna, and the receiving antenna is connected with a oscilloscope. A guide rod which is fixed by the disc insulator is provided in the GIS testing chamber. The present invention is capable of achieving testing propagation characteristic of partial discharge ultrahigh frequency electromagnetic wave signal of a gas insulated switchgear in a laboratory, so as to master attenuation characteristics of the partial discharge ultrahigh frequency electromagnetic wave signal.

Exemplary embodiments of the present disclosure are directed to resonant transformers (or reactors) and coil arrangements associated with resonant transformers. The coil arrangements can include a grounding coil configured to generate a net-zero induced voltage between a first end of the grounding coil and a second end of the grounding coil layer, and one or more step-up coil layers formed by one or more layers of pressure tape, insulating materials, and wire wrapped to form coils about a portions of a split magnetic core. The split magnetic core can include a first core segment and a second core segment, where one of the core segments is disposed within a main housing and one of the core segments is disposed external to the main housing. A gap between the first and second core segments can be manipulated to control an inductance of the resonant transformer.

A method and a device for locating internal arcing that occurs in a compartment (CP.sub.i) of a gas-insulated line (L), each compartment being provided with at least one pressure sensor (P.sub.i). The method comprises: triggering pressure measurements in a compartment as soon as the difference between the currents that flow through two current toroids (TC.sub.i) around two adjacent compartments exceeds a threshold value indicating the occurrence of internal arcing in the compartment; calculating a period t that separates the time at which the pressure detector began to detect a pressure variation and the time at which the internal arcing occurred; and calculating a distance d that separates the place at which the internal arc is formed from the position of the pressure sensor using the equation d=V/t in which V is the speed of sound in the gas.

A device for simulating high-frequency current propagation of partial discharge of a GIL/GIS is disclosed. The device comprises a casing, a busbar cavity, an adjustable impedor, a first metal support, a second metal support, a third metal support, and a high-frequency current sensor. The first metal support and the second metal support are separated by an insulating support, the third metal support has an end connected to the second metal support, as well as an end connected to a grounding grid, and the adjustable impedor is formed by an adjustable resistor and an adjustable inductor which are connected in series, and is connected in series between the first metal support and the second metal support through a wire. In the application, the adjustable impedor is connected in series to the metal supports at the grounding point to obtain an impedance equivalent to that of a long-distance GIL/GIS housing

Provided is a method of accurately detecting the location of a partial discharge in a power device. For this purpose, the present invention measures sequential positions of arrival of partial discharge signals and the differences in the time of arrival between the partial discharge signals with respect to a plurality of partial discharge sensors installed on the outside surface of a power device, divides the power device into a plurality of spatial sections, determines a spatial section where the location of a partial discharge is present using the sequential positions of arrival of the partial discharge signals, calculates the representative location value of the determined spatial section, and determines compensation values for the differences in the time of arrival to be applied with respect to the respective spatial sections.

A partial discharge sensor includes: a first ground (1) that constitutes a closed space (3) to surround a high-voltage wire (2); and a cylindrical branch pipe (4) disposed at the first ground (1) to protrude to an outer space to house with a lid (8) a first metal container (6) having at least one hole through which gas can pass, and having a slit (12) formed on the side to the space (3); at one end of a coaxial wire (7) disposed in the container (6), an outer conductor (9) of the coaxial wire (7) is connected to the first metal container (6) at a portion near the center of the slit (12), and an inner conductor (10) of the coaxial wire (7) is connected to the first metal container (6) at an opposite portion to a position where the outer conductor (9) is connected across the slit (12).

The faulty transformer partial discharge, vibration, combustible gases, and sound frequency monitor and alarm is an electric circuit. The faulty transformer partial discharge, vibration, combustible gases, and sound frequency monitor and alarm is a diagnostic tool. The faulty transformer partial discharge, vibration, combustible gases, and sound frequency monitor and alarm comprises a control circuit, a housing structure, and a transformer structure. The housing structure contains the control circuit. The housing structure attaches the control circuit to the transformer structure. The control circuit captures audible sounds generated by the transformer structure. The control circuit analyzes the captured audible sounds.