Abstract: The invention relates to a liquid-cooled valve reactor, in particular for a high-voltage DC transmission installation, including a reactor core (2) and a reactor coil (4), the reactor coil (4) including a primary winding (24), which comprises two cooled winding sections (30, 32), and a secondary winding (26), and the reactor core (2) being provided with a plastic jacket (14). According to the invention, the reactor core (2) is provided with a clamping frame (56) which has on its free surfaces (58) in each case a heat dissipator (60), a liquid-cooled secondary resistor (28) is provided, which is connected electrically in parallel to the secondary winding (26), and the encapsulated reactor core (2) and the reactor coil (4) are mounted on a baseplate (6). The result is an intensively cooled valve reactor.

Abstract: A liquid-cooled high-load resistor includes an element carrier having an inlet and an outlet, a break-through and a first and second electrical terminal connection, and one resistor element, respectively, on its flat sides. The active parts of the resistor elements are electrically connected in series by means of the break-through in the element carrier and are electroconductively connected to an electrical terminal connection of the element carrier. The liquid-cooled high-load resistor further includes two covers that each cover a flat side of the element carrier, to form an enclosed space between the cover and the flat side of the element carrier. The enclosed space is subdivided so as to provide a free space in the area of the inlet, the outlet, and the break-through, and to provide a cooling channel that embeds the active part of the resistor element.

Abstract: A compact valve choke that is simple to manufacture, which can, however, ensure the qualities required for all operating modes, namely the needed dielectric strength and freedom from partial discharges between components that are at different voltages. This valve-choke is achieved by having: the choke windings arranged in a supporting frame in a self-supporting manner, in relation to one leg of the choke core; the choke windings potted on all sides, and the potted block supported in the supporting frame by means of fittings; the choke core consists of two generally circular-shaped cores and is secured in the supporting frame; and the choke coil includes two primary windings wound in two layers, with an outer first winding portion and a concentric inner second winding portion as well as, a core-potential center tap roughly in the center of the windings between the first winding portion and the second winding portion.

Abstract: A light-triggerable thyristor comprises a cathode contact and a light conductor arranged in a bore thereof for supplying trigger energy. In order to obtain optimally low losses of the trigger energy and to guarantee simple assembly and interchangeability, the end of the light conductor at the side of the thyristor is surrounded by a rigid sleeve which is pluggable into a sleeve-shaped insert mounted in the bore. In particular, a central region of the cathode contact is fashioned raised in comparison to a flange-like projection of the cathode contact which is connected to a ceramic envelope, and the central region is provided with a groove which serves for receiving an angled portion of the rigid sleeve. The invention is particularly suited for power thyristors in high-voltage DC transmission systems.

Abstract: Hermetically sealed fiber optic cables (LW) are conducted through an insulator column consisting of several hollow insulators. The fiber optic cables (LW) are fastened to a support element (TE), whose one end is connected to the reference potential and whose other end is connected to a high voltage. The support element (TE) is characterized by a surface having only limited electrical conductivity. This assures that, as a result of the even field strength distribution thus guaranteed, no impermissibly high voltages are impressed on the fiber optic cable (LW). A non-conductive tube (GV) for conveying gas is wound around the support element (TE).

Abstract: A cooling capsule for a thyristor wherein the capsule is provided with a metallic core having at least one heat transfer surface and with a plurality of bores extending between surfaces of the core so as to form a meander-line-like flow path therethrough between an inlet opening and an outlet opening. The aforesaid surfaces between which the bores extend are provided with recesses each of which connects adjacent pairs of bores and the capsule is further provided with plate-like members, each of which covers a recess and is joined thereto by electron beam welding.