Abstract: An optoelectronic component has a housing (3) connected to a light guide (7, 8) for transmission of light to/from two optoelectronic semiconductor elements (1, 2) mounted in the housing. Light to a first one of the semiconductor elements (2) is deflected towards this element by a partially transmitting mirror (5). For common adjustment during assembly, the semiconductor element (2) and the mirror (5) are spherically journalled in the housing. The second semiconductor element (1) is rotatably journalled in relation to the mirror (5) and the first semiconductor element (2) for adjustment during assembly.

Abstract: A method for continuously monitoring gas dissolved in oil and includes placing a separator cell (1) in a conduit which extends from the upper part of an oil-cooled transformer and which is connected to the lower part of the transformer tank. The interior of the separator cell is divided by an inner glass filter (3) into two parts and the oil which flows through the separator and the glass filter is collected in the lower part of the separator. Through a pump (10) connected in the conduit from the separator to the lower part of the transformer tank, the oil level of the collected oil is maintained at a constant level. Between the glass filter and the collected oil, a gas compartment (5) is formed which contains gases extracted from the oil with a composition and concentrations uniquely determined by those gases dissolved within the oil. A gas sensor (6) is connected between the upper and lower parts of this compartment.

Abstract: A device for control of power (P) generated by a gas turbine (1) which drives an electric generator (2) with a rectifier (3) connected thereto, comprises a control member (6) adapted to control the fuel supply of the gas turbine (1) in such a way that the inlet temperature (T) of the gas turbine is caused to correspond, at least substantially, to a predetermined value (TR). A direct-voltage network (4) with controllable voltage (U) is connected to the rectifier (3) and the control member (6) generates a voltage control signal (URs) which is supplied to the direct-voltage network (4) .

Abstract: An overvoltage protective device for a series capacitor (C) has a main spark gap and a first auxilary spark gap, arranged adjacent thereto, for ignition of the main spark gap. A second auxiliary spark gap is arranged in association with the first auxiliary gap for ignition thereof. The first and second auxiliary spark gaps are connected between one of the electrodes of the the main spark gap and a voltage divider which comprises resistors (R1, R2, R3 ) and a varisistor (VR1) . When the knee voltage of the varisistor is exceeded, the second auxiliary spark gap is ignited, the arc of which initiates ignition of the first auxiliary spark gap, the arc of which in turn moves towards and ignites the main spark gap. During the arcing time of the spark gap, a controlled discharge of the series capacitor through a resistor (R2) takes place.

Abstract: A method and a device in an electric power network (1), comprising an active filter (4) controllable via a control input (41), for reducing disturbances generated by a disturbance source (6) located in and/or connected to the power network. A control member (8) is adapted, based on at least one first state variable (Y1i) sensed in the power network (1) and a model of the power network (1), to calculate the disturbances (X2) which occur in a second section (B--B) in the power network (1) without action from the active filter (4), to calculate a control signal (C1) such that, supplied to the control input (41), it would generate in the second section (B--B) the calculated disturbances (X2) with reversed polarity, and to generate the control signal (C1) and supply this to the control input (41).

Abstract: The invention relates to a surge arrester assembly with a plurality of parallel-connected arrester units (1) with polymer casing mounted in a rack. The lower and upper parts of the rack consist of bars (4a, 4b) of, for example, aluminium, which are included in the electric circuit. The bars are retained by, for example, support insulators (6) of porcelain or polymer material. The mechanical retention of the stacks of ZnO blocks of the arrester units (1) and the necessary contact pressure between the blocks are ensured by the rack structure. The electrical connections (23, 24) to the rack are arranged in such a way that, if a fault causing a short circuit in one of the block stacks occurs, the arc produced is blown by the current forces along the bars to the opposite end, where arcing horns (38) of a current-resistant material, for example steel, are arranged and where the arc may burn in a controlled manner without involving a risk to the environment. (FIG.

Abstract: A device for motor and short-circuit protection in low-voltage plants includes a contact device (3) which is connected in series with a tripping circuit comprising two parallel-connected current branches. One of the branches comprises a first thermistor (1) serving as an overload protective means and connected in series with a second thermistor (2) serving as a short-circuit protective means. The second branch comprises a multi-turn excitation coil (4) which is adapted to influence the contact device (3) for opening thereof at an overcurrent. The resistivity of the two thermistors (1, 2) has a positive temperature coefficient in the temperature range in question. The first thermistor (1) may consist of a ceramic material or electrically conductive polymer composite. The second thermistor (2) consists of polymer composite with a extremely high content of electrically conductive filler and is, in addition, layered.

Abstract: An electric switching device according to the invention comprises two fixed contacts and one movable contact, referred to jointly as the main contact system. The main contact system is located in an oil-insulated cavity enclosed in a housing. In its direction of movement, the movable contact has an extension in the form of a shaft. The shaft is formed with a hydraulic piston by which the movable contact is operated. The hydraulic piston is surrounded by a cavity in which a piston cavity is formed on each side of the hydraulic piston. The piston cavities are oil-filled. The movement of the shaft is determined by an electrically controlled directional valve. The directional valve receives signals as to whether the electric switching device is to be opened or closed. At a given signal, the directional valve distributes a high pressure to the piston cavity that is to be enlarged.

Abstract: The invention relates to an arrangement on a railbound vehicle with hydraulic cylinders (14a, 14b, 15a, 15b) for tilting the car body in track curves. The arrangement is characterized in that the hydraulic cylinders are arranged mutually communicating and that the tilting of the car body is adapted to be controlled by a servo function comprising one servo valve (13) per vehicle.

Abstract: A method and a device in an electric power network (1), comprising an active filter (4) controllable via a control input (41), for reducing disturbances generated by a disturbance source (6) located in and/or connected to the power network. A control member (8) is adapted, in dependence on the control deviation (DU) from a desired value (Y2iR) of at least one state variable (Y2i) sensed in the power network (1), to generate a control signal (C1) which is supplied to the control input (41). The control member (8) is adapted to transform the control deviation (DU) in a filter device (93) with a transfer function (FI) which simulates the inverse of the transfer function (F1') from the control signal (C1) to the control deviation (DU) and/or to filter the output signal of the controller in a filter device (943, 953, 956) without any phase shift. (FIGS.

Abstract: The invention relates to a method for tilting of the car body in track curves on a railbound vehicle, the tilting of the car body being achieved by means of hydraulic cylinders and the tilting being adapted to be controlled by one or more servo functions. According to the invention, the car body tilt is adapted to be limited to a maximum value, and when snow occurs, which is packed between the different parts of the tilting system, the degree of snow packing is indicated, and when a certain degree of snow packing is exceeded, the desired value of the tilt angle is maximized to a suitable smaller value.

Abstract: Edge position determination of metallic materials by means of evaluation of the voltages which are induced in coils located at the edges of the material below the material and partially covered by the material as well as coils located inside of the first-mentioned coils in the transverse direction of the material, which latter coils are completely covered by the material in connection with a decaying magnetic field which is generated by the same coils.

Abstract: A transformer or reactor with a winding of a sheet-formed conductor material wherein the winding comprises a cooling element arranged between two consecutive winding turns and wherein the conductor material, within a region nearest the cooling element, in the axial direction of the winding has a decreasing width for each winding turn towards both the inner and outer cylindrical surfaces of the cooling element.

Abstract: The invention relates to a new arrangement of at least one valve stack (2) for high voltage direct current in a valve hall (1). Said valve stack (2) has a voltage to ground which, in operation, increases along the stack (2). The invention comprises arranging the stack (2) in a substantially lying position at such a distance from the floor and roof (9), respectively, of the valve hall (1) that the smallest electrical flashover distance between live parts on the stack (2) and said floor and roof (9), respectively, is at least contained. Further, the electrical connection is arranged via bushings through the roof (9) of the valve hall (1).

Abstract: In a coating machine for coating of strip with a lining which is wider than the strip, a method and a device for filling up the space between the strip and the outer edges of the lining with edge strip, wherein the edge strip is passed inside a bent and folded transport channel, a first bent part of which coincides with the longitudinal direction of the strip.

Abstract: A method and apparatus for generating a current corresponding to a quantity supplied to the device, for example an analog current output device for a digitally working process control system, using two parallel-working current-generating means, each one connected to a current summation means; the current-generating means are each adapted to generate a current proportional to the quantity and the proportionality being determined by a changeable proportionality factor. Each one of the current-generating means being adapted to supervise both its own function and that of the other means. Upon indication of a malfunction in one of the means, the function of the device is taken over by the other means alone.

Abstract: The invention relates to a condenser type barrier for field control in transformer bushings and their connection to the conductor of a transformer winding for transformers used in HVDC converter plants. The condenser barrier is arranged as a solid of revolution with concentrically laid condenser layers. It is formed from both ends with inwardly-directed, straight frustums of cones with equally large smallest bases, between which the condenser barrier is formed as a concentric inner, straight circular cylinder.

Abstract: The invention relates to a condenser body for field control in transformer bushings and the connection of the body to the conductor of a transformer winding for transformers used in HVDC converter plants. The condenser body is arranged as a solid of revolution with concentrically laid condenser layers. It is formed from one end with an outwardly-directed straight frustum of a cone and from the other end with an inwardly-directed straight frustum of a cone.

Abstract: The invention relates to an industrial robot with a stand (1) which is rotatably journalled in a base (2) and provided with a mechanical stop for limiting the rotary motion of the stand. The stop comprises at least one radially projecting stop arm (7), which in a certain rotational position makes contact with a stop pin (6) arranged on the base (2). The rotary moment is taken up by deformation of the stop pin (6). The stand (1) is provided with a plurality of recesses (8, 10) arranged around the periphery of the stand, whereas the stop arm (7) is formed with at least one fixing projection (12, 13) which is adapted to the recesses and which, with the aid of a wedge member (14), may be fastened into one of the recesses at an optional location on the periphery of the stand.

Abstract: A surface emitting LED has a PN junction between two semiconductor layers, at least one layer being an active layer. The diode is adapted for emitting light through an exit surface. Between the active layer and the exit surface the diode has a luminescence layer with a narrower energy gap than that of the active layer.