A bushing and a method for monitoring the bushing. The bushing is a high-voltage DC bushing with a test tap. The high-voltage DC bushing arrangement includes a monitoring device configured to inject a voltage and/or current pulse signal via the test tap and to detect and process a corresponding response signal. There is also described a method for operating an HVDC bushing, an HVDC transformer, and a converter arrangement with the bushing.

A high-voltage cable fitting with a rigid core insulator that has a first conical outer surface extending concentrically about a longitudinal axis. An elastomeric stress relief element has a first conical inner surface is designed for mating the first conical outer surface at an interface. A rigid member is provided for pressurizing the elastomeric stress relief element at the interface. The stress relief element is pressed onto the rigid core insulator. The rigid member has at least one pressure enhancing portion extending circumferential about the longitudinal axis for causing an additional axial expansion stress in a sleeve portion of the stress relief element extending along the first conical outer surface of the core insulator in an assembled state of the cable fitting.

A bushing includes an insulating housing, an electrical conductor, extending through the housing and an insulating fluid in the housing, wherein the insulating fluid has a viscosity at a temperature of 100? C. of equal or less than 2 mm.sup.2/s. The bushing includes a condenser body surrounding the electrical conductor, wherein the condenser body includes electrically insulating layers and electrically conductive layers, wherein the electrically insulating layers are formed from a paper impregnated with the insulating fluid.

A bushing includes an insulating housing, an electrical conductor, extending through the housing and an insulating fluid in the housing, wherein the insulating fluid has a viscosity at a temperature of 100? C. of equal or less than 2 mm.sup.2/s. The bushing includes a condenser body surrounding the electrical conductor, wherein the condenser body includes electrically insulating layers and electrically conductive layers, wherein the electrically insulating layers are formed from a paper impregnated with the insulating fluid.

A method of manufacturing a capacitive electrical device is disclosed. The method includes a) bonding a first electrical insulation film with a second electrical insulation film to obtain a single electrical insulation film that has a larger surface area than any of the first electrical insulation film and the second electrical insulation film has alone, b) providing a conductive layer onto the single electrical insulation film, and c) winding the single electrical insulation film and the conductive layer around a shaft to obtain a layer of the single electrical insulation film and a layer of the conductive layer wound onto the shaft, thereby forming the capacitive electrical device.

A high-voltage bushing contains an insulating body that is arranged concentrically around a cylindrical winding support formed of an electrically-conductive material, conductive control inlays which capacitive potential control the high-voltage bushing and are spaced apart from one another by insulation layers, and are arranged concentrically with the winding support. A connection device is provided for establishing an electrical connection between a first control inlay closest to the winding support, and the winding support. The high-voltage bushing is characterized in that the connection device contains an electrical sliding contact.

A high-voltage bushing contains an insulating body that is arranged concentrically around a cylindrical winding support formed of an electrically-conductive material, conductive control inlays which capacitive potential control the high-voltage bushing and are spaced apart from one another by insulation layers, and are arranged concentrically with the winding support. A connection device is provided for establishing an electrical connection between a first control inlay closest to the winding support, and the winding support. The high-voltage bushing is characterized in that the connection device contains an electrical sliding contact.

The method is provided for manufacturing a perforated sheet-like high-voltage insulating spacer for a high-voltage component, which component comprises a field grading condenser core with the spacer which is wound in spiral form around an axis, with electrically conducting layers which are inserted between successive windings of the spacer, and with a polymeric matrix which penetrates the spacer and which embeds the spacer and the layers. The method comprises at least steps as follows: an electrically insulating tape, and the patterned tape is expanded at right angle to the cutting lines in order to form a spacer with a perforated three-dimensional lattice structure. The combined effect of cutting a tape and expanding the cutted tape allows the formation of spacers with a manifold of sizes which exceed the size of the tape in function of manufacturing parameters, in particular in function of the configuration of the pattern and the magnitude of the expansion.

The method is provided for manufacturing a perforated sheet-like high-voltage insulating spacer for a high-voltage component, which component comprises a field grading condenser core with the spacer which is wound in spiral form around an axis, with electrically conducting layers which are inserted between successive windings of the spacer, and with a polymeric matrix which penetrates the spacer and which embeds the spacer and the layers. The method comprises at least steps as follows: an electrically insulating tape, and the patterned tape is expanded at right angle to the cutting lines in order to form a spacer with a perforated three-dimensional lattice structure. The combined effect of cutting a tape and expanding the cutted tape allows the formation of spacers with a manifold of sizes which exceed the size of the tape in function of manufacturing parameters, in particular in function of the configuration of the pattern and the magnitude of the expansion.

Disclosed is a capacitor bushing and a method of manufacturing the same. The capacitor bushing includes insulating layers (20), formed by winding insulating fibers (22) around the outer side of a central conductor (10), and conductive layers (30) between the insulating layers (20). The wefts (34) and warps (36) that constitute the conductive fibers (32) are manufactured by sequentially forming a first coating layer (38) and a second coating layer (38) on the surface of a core wire (37). The wefts (24 and 34) and the warps (26 and 36) of the insulating fibers (22) and the conductive fibers (32) extend obliquely with respect to the longitudinal direction of the central conductor (10). The wefts (24 and 34) and the warps (26 and 36) form a polygonal or circular shape. The present invention has a merit in that bubbles are prevented from being generated in the filling layers (40).