Abstract:
The present invention relates to a high-voltage insulation system which is suitable for low temperatures and which, in addition to a cooling liquid (3) comprises a solid material insulator (2) based on a cellulose fabric (20). The solid material insulator (2) is preferably used in the form of pressboards and is impregnated with a polymer resin (21). It has a high partial discharge inception field of 77 K and, in addition, its thermal coefficient of expansion is optimally matched to that of ceramic high-temperature superconductors. The pressboards can be formed in the dry stage, in particular to produce coil formers, and are joined together alternately with cotton fabrics to form laminates of any desired thickness.
Abstract:
A high-voltage isolator is disclosed which has a first electrical connecting piece and a second electrical connecting piece, between which an electrical isolating body extends. The end sections of the connecting pieces are connected to the isolating body, with a toroidal field control element being arranged on at least one of the end sections. A slot, which extends in the circumferential direction of the end section, is introduced on the end section which has the field control element. The field control element and the respectively associated end section are formed integrally. As a result of the slot, tension and compression forces which occur during longitudinal and lateral contractions of the isolating body and act at right angles to the longitudinal axis of the end section can be largely prevented, as can shear forces, while at the same time achieving a high level of uniformity in an area of the isolating gap, for electrical fields which occur during operation.
Abstract:
A high-voltage insulator includes a metal armature, an insulating tube joined to the metal armature, which is adhesively bonded to the metal armature at an end formed as a supporting ring, and an axially symmetrical adhesive-bonding joint disposed around the axis of the insulating tube. An annular grove, which is formed in the metal armature, is disposed around the axis of the insulating tube and receives an end portion of the supporting ring. Sealing surfaces are respectively formed in the groove and in the supporting ring. The sealing surfaces are arranged and formed in such a way that, when the insulating tube and the metal armature are joined, they slide on one another, thereby forming a seal, and the supporting ring acting as a displacement body presses adhesive that has been introduced into the groove before the joining into the adhesive-bonding joint.
Abstract:
The installation contains a current conductor producing Joulean heat in the operating state, a cooling element and a monitoring device. The cooling element has a condensable working medium and an evaporator, which can be heated by the current conductor of the installation, and a condenser which has been withdrawn from the heating effect of the current conductor. The monitoring device comprises at least one sensor for detecting a parameter of the cooling element and an evaluation unit, which receives output signals from the sensor. In the evaluation unit, the output signals of the sensors are evaluated and a signal describing the state and/or the functionality of the cooling element is formed there. This installation is characterized by high operational reliability with a high current-carrying capacity and dimensions which are kept small.
Abstract:
The vacuum switching chamber has two contact pieces and is provided with at least one heat pipe for dissipating heat. The heat pipe contains a working medium for dissipating the heat by evaporating the working medium in a section, referred to as the evaporator, of the heat pipe and condensing the working medium in a section, referred to as the condenser, of the heat pipe. Advantageously, the evaporator is in close thermal contact with at least one contact piece, and, in particular, at least part of the evaporator is integrated in the first contact piece or the second contact piece. Advantageously, the condenser has a cooling rib arrangement.
Abstract:
The present invention relates to a resistive superconducting current limiter with a meandering shape. This current limiter avoids current density peaks at the turning points (12) or corners of the conductor track (10, 11) in that the central path of the fault current when limiting occurs is artificially increased by appropriate design of the turning points. For this purpose, conductor material is removed in the region of the inner edge of the turning points (13), or the electrical bypass is reinforced at its outer edge (14).
Abstract:
A superconducting conductor and its method of manufacture includes an electrical conductor having a thermal conductor attached to and along a length of superconductor member and separated from the superconductor member by an electrically-insulative material. The member may include a length of superconductor composite having superconducting material and a non-superconducting, electrically conductive matrix material. The electrical conductor is configured to control the manner in which the superconductor transitions from its superconducting state to its non-superconducting (i.e., normal) state due to, for example, a fault current condition. The electrically-insulative material has a thickness for allowing heat from the superconductor to be conveyed to the thermal conductor. The superconducting conductor may be used in conjunction with a superconducting current-limiting device.
Abstract:
An exemplary isolating tube, and production method thereof, includes a mechanically load-bearing plastic tube composed of a fiber-reinforced polymer for use in a cooling element which can be loaded with high voltage, during whose operation the isolating tube forms an electrical isolation gap and in the tube interior carries an agent which flows as a liquid and/or vapor. The isolating tube can have a diffusion barrier which is held coaxially by the plastic tube. Such an isolating tube can be produced using an exemplary novel method for production.
Abstract:
An electrical contact system for an electrical switching device is proposed, which has two contact units and in which a contact force acts between the contact unit and the contact unit when an electrical contact is made, wherein means are provided to exert the contact force, and wherein the first contact unit can be disconnected from the second contact unit. The means are distinguished in that they have a thermal expansion effect which results in an increase in the contact force as the temperature of the means rises.
Abstract:
Because the efficiency of the thermal energy storage technology is inherently restricted, its beneficial use is limited to very particular economic boundary conditions, i.e. a large difference between the value of electricity going into the unit and the value of electricity coming out of the unit. With the reduction in wind power equipment prices and the cost of fossil fuels and/or their combustion products this is occasionally the case for wind power. Wind is a free fuel and the value of wind power when there is too little load demand is essentially zero, and the value of wind power when there is demand is considerable indeed. Under these circumstances, a combination of electrothermal energy storage and combustion of (fossil) fuels as an auxiliary heat source provides for a cost efficient system for storing energy and an economical way of generating electricity.