A large-capacitance insulating core, a high-voltage electrical appliance and a multi-functional high-voltage bushing. The insulating core is internally provided with a capacitance increasing structure. The capacitance increasing structure is a plurality of capacitive screen sets formed by a forward capacitive screen set and a reverse capacitive screen set that are alternatively arranged and in parallel connection. The forward capacitive screen set includes a plurality of capacitive screens arranged alternatively with insulating layers, an innermost capacitive screen of the forward capacitive screen set is connected to a high potential, and an outermost capacitive screen is connected to a low potential. The reverse capacitive screen set includes a plurality of capacitive screens arranged alternatively with insulating layers, an innermost capacitive screen of the reverse capacitive screen set is connected to a low potential, and an outermost capacitive screen is connected to a high potential; and an innermost capacitive screen set and an outermost capacitive screen set in the plurality of capacitive screen sets of the capacitance increasing structure are both the forward capacitive screen sets, and can satisfy the voltage-sharing and large-capacitance requirements simultaneously. The high-voltage electrical appliance and the multi-functional high-voltage bushing include the large-capacitance insulating core.

A high-voltage bushing can be plugged into a bushing socket of an electrical device of a high-voltage installation. The high-voltage bushing has an internal conductor, an insulating body which at least partly encloses the internal conductor, and a plug-in section for plugging the high-voltage bushing into the bushing socket. A heat pipe is provided in the internal conductor. The heat pipe is at least partly filled with a vaporizable cooling liquid and the heat pipe extends into the plug-in section. A high-voltage installation having the high-voltage bushing is also provided.

A high-voltage bushing can be plugged into a bushing socket of an electrical device of a high-voltage installation. The high-voltage bushing has an internal conductor, an insulating body which at least partly encloses the internal conductor, and a plug-in section for plugging the high-voltage bushing into the bushing socket. A heat pipe is provided in the internal conductor. The heat pipe is at least partly filled with a vaporizable cooling liquid and the heat pipe extends into the plug-in section. A high-voltage installation having the high-voltage bushing is also provided.

Described is a plug-in bushing, a manufacturing method of same, and a high-voltage installation, more specifically, to a plug-in high-voltage bushing for connecting an external electrical conductor to a high-voltage installation filled with an insulating body, and to a high-voltage installation comprising the bushing. The plug-in bushing comprises: a conducting body; a resin insulating body surrounding the conducting body; an electric field-control electrode made of a semi-conducting synthetic resin material, coupled to an upper end of a lower support fitting; the lower support fitting connected to the outer circumference of a lower part of the resin insulating body; and injected insulating body produced by an insert injection including the outer circumference of the resin insulating body and electric field-control electrode, having formed thereon a plurality of fins; and a stress cone connected to a lower end of the resin insulating body.

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 high-voltage apparatus contains an internal conductor, an insulating body which surrounds the internal conductor along its longitudinal direction and has insulating layers which are composed of a synthetic material which is impregnated with a resin, and also electrically conductive control inserts for field control which are arranged concentrically around the internal conductor and are spaced apart from one another by the insulating layers. At least one of the control inserts is a contact insert which is electrically connected to the internal conductor by a contact-making device. The contact-making device has a contact element which is composed of electrically conductive material and is electrically connected to the contact insert. The contact element is fixed by adhesive bonding to a conductive substrate which is in electrical contact with the internal conductor.

Disclosed are an insulated pipe and an insulated bushing. The insulated bushing (1000) includes: an insulator (110) including an intermediate shed member (112), and a lower flange (114) arranged on a lower end of the shed member; a head member (120) connected to an upper end of the insulator, wherein the head member includes an oil conservator (121) connected to the upper end of the insulator and a connecting terminal (122) connected to the oil conservator; and an insulated pipe (100) connected to the lower flange, wherein the insulated pipe includes a upper transformer pipe (101) and a lower oil-immersed pipe (102), and the transformer pipe includes an inner pipe (103), and a conductive layer arranged outside the inner pipe and configured to be grounded. The insulated pipe and the insulated bushing solve the problems of connection and sealing, and save material cost greatly.

A multifunctional capacitive-type sleeve with a vacuum arc-extinguishing chamber comprises a sleeve insulation core covered outside the vacuum arc-extinguishing chamber, wherein one ends of two connection terminals are respectively led out from the two ends of the sleeve insulation core, and the other ends of the two connection terminals can be contacted and separated in the vacuum arc-extinguishing chamber to switch on and off a circuit. The multifunctional capacitive-type sleeve with a vacuum arc-extinguishing chamber according to the present invention not only has the function of a sleeve, but also has the function of a disconnector, the sleeve insulation core is internally provided with a vacuum arc-extinguishing chamber to switch on and off the circuit, which can simplify structures of a high-voltage switch and a control cabinet, reduce the device volume, and decrease the device cost.

A multifunctional capacitive-type sleeve with a vacuum arc-extinguishing chamber comprises a sleeve insulation core covered outside the vacuum arc-extinguishing chamber, wherein one ends of two connection terminals are respectively led out from the two ends of the sleeve insulation core, and the other ends of the two connection terminals can be contacted and separated in the vacuum arc-extinguishing chamber to switch on and off a circuit. The multifunctional capacitive-type sleeve with a vacuum arc-extinguishing chamber according to the present invention not only has the function of a sleeve, but also has the function of a disconnector, the sleeve insulation core is internally provided with a vacuum arc-extinguishing chamber to switch on and off the circuit, which can simplify structures of a high-voltage switch and a control cabinet, reduce the device volume, and decrease the device cost.

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.