ABB Ltd

About: ABB Ltd is a company organization based out in Zurich, Switzerland. It is known for research contribution in the topics: Voltage & Signal. The organization has 6222 authors who have published 6852 publications receiving 83994 citations.

High pressure press and method for high pressure treatment of substances

Abstract: A high-pressure and a method for high-pressure treatment of substances. The high-pressure press comprises a high-pressure cylinder consisting of a number of concentrically arranged cylinder elements (1, 2, 3). The cylinder elements (1, 2, 3) are radially prestressed to a predetermined prestress and surround a high-pressure chamber (6) for accommodating a pressurized medium. A thin safety liner (3), which is intended to be placed in the high-pressure cylinder until a fracture arises on the safety liner (3), is arranged in the interior of the high-pressure cylinder. Further, means (14, 15) are provided to conduct at least part of the pressurized medium from the high-pressure chamber (6) when a fracture arises on the safety liner (3). The means (14, 15) comprise at least one channel (14) running essentially along the outer envelope surface of the safety liner (3). The method comprises using the high-pressure press without liner replacement until a fracture has occurred on the thin safety liner.

Performing Comprehensive Voltage Stability Studies for the Determination of Optimal Location, Size and Type of Reactive Compensation

Abstract: This paper presents a summary of a methodology and the tools employed in performing comprehensive voltage stability studies to identify reactive compensation requirements for a transmission system. The approach focuses on both steady-state and time-domain dynamic simulation techniques. The two key aspects of the study approach are the use of optimal power flow techniques for determining the best location for reactive compensation, and using extensive load sensitivity analysis in time domain to determine a prudent mix of dynamic VArs (e.g. SVCs) versus discrete switched devices (e.g. mechanically switched capacitor banks)

Rotor of an asynchronous machine

Abstract: In a rotor of an asynchronous machine, the rotor body is constructed from "thick" laminate discs (1) and forms a self-supporting structural unit which is connected to the shaft (9). The individual laminates (1) are held together either by bolts, if necessary in combination with the laminate discs (1) being welded to one another, or only by welding to one another. A rotor of such construction is suitable for all operating stresses since no stress increases occur either on the shaft seating or in the region of the rotor teeth.

Device for mixing of two gaseous components and burner in which this device is applied

Abstract: A device for mixing two gaseous components, particularly in the context of a burner in which it is desired to mix the two gaseous components prior to combustion. The device includes a tangential inlet flow duct which opens into an inlet flow gap. A first gaseous component flows in through this inlet flow gap, and a second gaseous component flows through inlet flow nozzles provided in the region of the inlet flow gap. The arrangement achieves particularly intimate mixing, such that an improved burner is provided. Ramps are disposed in the region of the inlet flow duct, with the ramps including an end having a separation edge in the inlet flow gap. The inlet flow nozzles are arranged in the region around the separation edge such that mixing is promoted by longitudinal vortices occurring in the region.

Surge voltage arrester

Abstract: This surge voltage arrester has two connecting fittings (1, 2) which are braced with respect to one another. At least one pellet (7) consisting of varistor material is clamped in between the connecting fittings (1, 2). It is intended to create a surge voltage arrester which can be produced using simple means and which, in addition, can be cast around in a simple manner. This is achieved in that at least two insulating clamping elements, which are arranged symmetrically, are provided for bracing the connecting fittings (1, 2). The clamping elements, the at least one pellet (7) and, partially, the connecting fittings (1, 2) have insulating plastic material cast around them to form a monolithic block.