Abb Research Ltd.

Abb Schweiz Ag

Asea Brown Boveri Inc.

Hitachi Energy Switzerland Ag

Asea Brown Boveri Ag

Abb Power Grids Switzerland Ag

Abb Technology Ag

Felix Greuter

Ralf Strumpler

Michael Hagemeister

Lise Donzel

Joachim Glatz-Reichenbach

Claus Schuler

Ralf Str&uuml;mpler

Reinhard A Simon

Darren Dale Tremelling

Jian He

Lars Liljestrand

Chun Li

Walter Schmidt

Elio Alberto Perigo

JianSheng Chen

Elisabeth Lindell

Nikolaus Zant

Thomas Gradinger

Jens Rocks

Deli Gao

Uwe Kaltenborn

Martin Carlen

Xavier Kornmann

Didier Cottet

Ektor Sotiropoulos

Andrej Krivda

Elias Julke

Erik Johansson

Bandeep Singh

Rudi Velthuis

Tudor Baiatu

Liang Song

Arthouros Iordanidis

Thomas Christen

Leopold Ritzer

Markus Abplanalp

Jacim Jacimovic

Rico Gasparini

Reto Kessler

Petra Kluge-Weiss

Hansjoerg Gramespacher

Bernhard Doser

Lorenz Herrmann

Daniel Neeser

Rudolf Gati

Jorgen Skindhoj

Wolfgang Kluge

Yvo Dirix

Jakob Rhyner

Vincent Tilliette

Weidong Zhou

Elio Perigo

Daniel Müller

Markus Hoidis

Dieter Fuechsle

Arne Nysveen

Ruzica Loitzl-Jelenic

Peter Dubach

Tomaz Tomse

Stephen Clifford

Gerhard Mauthe

Zdenek Pelanek

Daniel Werder

Marlene Ljuslinder

Anton Demarmels

Svend Roche

Maoshan Niu

J&ouml;rgen Skindhoj

Oliver Beck

Faustine Soyeux

Veronika Schmid

Lars E Schmidt

Emilia Gustafsson

Lars Schmidt

The present disclosure provides a method for producing a magnetic powder and the use of a waste magnetic material for producing isotropic or anisotropic magnets. The method including providing a waste magnetic material including a waste magnetic chemical composition, analyzing the waste magnetic material to obtain information about the waste magnetic chemical composition thereof, adjusting the waste magnetic chemical composition to a target magnetic chemical composition to obtain an adjusted waste magnetic material, and atomizing the adjusted waste magnetic material to obtain the magnetic powder.

Method for producing a magnetic powder

A transformer is provided, which includes a tank having an enclosed volume with an insulating material, the tank including at least one channel extending through the tank, wherein the interior of the at least one channel is separated from the enclosed volume of the tank by a channel wall. A transformer core is provided outside of the enclosed volume, including at least one core leg extending through the tank via the at least one channel. At least one coil is located inside the enclosed volume, the coil being wound about the at least one channel, the tank has an inner wall or outer wall including a weakly-conductive layer, which includes fibers embedded in an impregnating material.

Medium-frequency transformer with dry core

A surge arrestor includes an active part extending along a longitudinal direction of the surge arrester, a first electrode having a first interlocking part, a second electrode resting against a second end of the active part, a flexible insulating housing, and a second interlocking part formed on an inner surface of the flexible insulating housing. The flexible insulating housing includes: a support member mechanically connecting and supporting the assembly of the first electrode, the active part and the second electrode, which has a plurality of supporting elements being arranged parallel to the longitudinal direction of the surge arrester and being arranged laterally at sides of the assembly of the first electrode, the active part and the second electrode, and an insulating expandable part with a plurality of sheds extending outwards, being moulded around the support member and being spaced apart from the assembly.

Surge arrester and associated manufacturing method

A sintered magnet, the sintered magnet including a core portion, a shell portion arranged at an outer part of the sintered magnet, and a diffusion portion arranged at least partially between the core portion and the shell portion. The shell portion has a coercivity, which is at least 30 kA/m larger than the coercivity of the core portion. In the diffusion portion, the coercivity is not less than the coercivity of the core portion and not larger than the coercivity of the shell portion and the value of the coercivity gradually increases from the core portion towards the shell portion. The thickness of the core portion is not less than 1 mm and the total thickness of the shell portion and the diffusion portion is at least 5 mm.

Sintered magnet, electrical machine, use of the sintered magnet for an electrical machine and manufacturing method of a sintered magnet

A surge arrester and a method for manufacturing the surge arrester are disclosed. The surge arrester includes a preassembled active part extending in a longitudinal direction, and a separately produced flexible housing defining a bore in the longitudinal direction and having an opening at an end surface of the flexible housing. The flexible housing is arranged surrounding the active part via the bore and in contact with the active part. The contact causes a deformation of the flexible housing in a circumferential direction, and the deformation generates a pressure applied on the active part along a radial direction.

This application concerns a magnet having a magnet body as well as a method for manufacturing such a magnet. The magnet body has a first region with first magnetic properties and a second region with second magnetic properties that are different to the first properties. Owing to the manufacturing process of the magnet body, the relative location of the first region and the second region within the magnet body is freely predeterminable.

Magnet having regions of different magnetic properties and method for forming such a magnet

A system for transient over voltage protection of a three-phase transformer. Two surge arresters are series connected across each winding of the transformer and the center point connection of the two surge arresters is electrically connected to a middle location of the winding. Three additional surge arresters are electrically connected from each phase to ground in the case of either a delta or Y connected transformer; and/or connected from a neutral point to ground in the case of a Y connected transformer. The system allows for all of the surge arresters to be packaged as an integrated surge arrester system to minimize induced transient over voltages and high stresses on the transformer winding due to internal resonances.

System for protection of dry type transformers

A multi-terminal surge arrester which includes an active part extending along a longitudinal direction of the surge arrester, a first electrode resting against a first end of the active part, and a second electrode resting against a second end of the active part, which second end opposes the first end in the longitudinal direction of the surge arrester. The surge arrester further includes an insulating fixing device mechanically connecting and fixing the first electrode and the second electrode, and an insulating housing arranged around the active part. The active part includes at least two metal-oxide based varistor elements and a further electrode arranged between the at least two varistor elements, which further electrode provides an externally accessible electrical connection. Therein, the surge arrester is adapted for being insulated by surrounding air.

Multi-terminal surge arrester

The present invention relates to a varistor material for a surge arrester with target switching field strength ranging from 250 to 400 V/mm comprising ZnO forming a ZnO phase and Bi expressed as BiOforming an intergranular bismuth oxide phase, said varistor material further comprising a spinel phase, characterized in that the amount of a pyrochlore phase comprised in the varistor material is such, that the ratio of the pyrochlore phase to the spinel phase is less than 0.15:1.

High field strength varistor material

Exemplary embodiments are directed to a device with overvoltage protection that includes a varistor which can be connected by a first connection via a first line to high-voltage potential in a circuit arrangement, while a second connection is connected to ground via a second line. Furthermore, an additional impedance is provided, which can be connected between the second connection and ground or the first connection and the high voltage, or is mounted fixed in this position. The corresponding line can be interrupted by a switching arrangement. In order to test the withstand voltage of the circuit arrangement, at least one of the first and second line is interrupted and an additional impedance is inserted. A test voltage is applied to the circuit arrangement. After the overvoltage test, the interruption in at least one of the first and second lines is removed again.

Device with overvoltage protection and method for its testing

Polymer concrete electrical insulation including a hardened epoxy resin composition filled with an electrically non-conductive inorganic filler compositions. The polymer concrete electrical insulation system optionally may contain additives. The epoxy resin composition is based on a cycloaliphatic epoxy resin. The inorganic filler composition can be present within the range of about 76% by weight to about 86% by weight, calculated to the total weight of the polymer concrete electrical insulation system. The inorganic filler composition includes a uniform mixture of (i) an inorganic filler with an average grain size within the range of 1 micron (&#x3bc;m) to 100 micron (&#x3bc;m) [component c(i)], and (ii) an inorganic filler with an average grain size within the range of 0.1 mm (100 micron) to 2 mm [component c(ii)]. The inorganic filler with an average grain size within the range of 1 micron (&#x3bc;m) to 100 micron (&#x3bc;m) [component c(i)] can be present in an amount within the range of 22% to 42%, calculated to the total weight of the polymer concrete electrical insulation system; and (e) the inorganic filler with an average grain size within the range of 0.1 mm to 2 mm [component c(ii)] is present within the range of 41% to 61% by weight, calculated to the total weight of the polymer concrete electrical insulation; and method of producing said electrical insulation.

Polymer concrete electrical insulation

The disclosure relates to an overvoltage protection means containing ZnO microvaristor particles for protecting electrical elements and a method to produce the means. Single microvaristor particles are placed in an arrangement having a monolayer thickness and are electrically coupled to the electrical element to protect it against overvoltages. Embodiments, among other things, relate to: 1-dimensional or 2-dimensional arrangements of microvaristor particles; placement of single microvaristors on a carrier; the carrier being planar or string-like, being structured, being a sticky tape, having fixation means for fixing the microvaristors, or having electrical coupling means. The monolayered overvoltage protection means allows very tight integration and high flexibility in shaping and adapting it to the electric or electronic element. Furthermore, reduced capacitance and hence reaction times of overvoltage protection are achieved.

Microvaristor-based overvoltage protection

The invention relates to a nonlinear electrical material with improved microvaristor filler (), to devices and electrical apparatuses comprising such nonlinear electrical material and to a production method thereof. According to invention, the filler () comprises larger spherical particles () and smaller irregular particles () that are arranged interstitially and provide non-point-like and/or multiple contact areas () owing to their irregular outer shape comprising edges and faces. Embodiments, among other things, relate to: spherical particles () being calcinated and broken-up to retain their original shape; irregular, spikly shaped, particles () obtained by calcinating or sintering and crushing or fracturing granules or blocks; and addition of a third filler fraction. Advantages, among others, are: higher filler contents, more and more durable inter-particle contacts (), enlarged effective micro-contact area, and improved electrical performance of the nonlinear electrical material.

Nonlinear electrical material for high and medium voltage applications

The polymer compound contains a polymer matrix and a filler embedded in the matrix. The filler comprises two filler components with nonlinear current-voltage characteristics deviating from one another. By selection of suitable amounts of these filler components, a polymer compound with a predetermined nonlinear current-voltage characteristic deviating from these two characteristics can be formed in this way.

Polymer compound with nonlinear current-voltage characteristic and process for producing a polymer compound

Growing community of inventors

Baden-Rütihof, Switzerland

Felix Greuter