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Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.v.

Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Friedhelm Pohlmann

Mario Brockschmidt

Peter Gröppel

Andrey Mashkin

Roland Röding

Guido Schmidt

Claus Rohr

Christian Staubach

Daniel Hansmann

Steffen Lang

Christoph Lehmann

Bastian Plochmann

Waldemar Kowalski

Frank Rainer

Bobby A Warren

Alexander Litinsky

Stefan Kempen

Michael Nagel

Regina Mühlberg

Manuel Weil

Joachim Jonuscheit

Ralf Merte

Harald Griem

Julia Wirsing

Simon Voss

Bora Kocdemir

Dora Schattauer

Maris Bauer

Fabian Friederich

Stefan Krane

Ralf Nottelmann

Markus Wysgol

Rene Höhner

A method and testing device for the non-destructive testing of at least partial regions of an insulation of a stator winding of an electric machine, in particular a generator of a high-voltage motor, wherein the non-destructive testing is carried out in situ at the installation site of the electric machine using terahertz measurement technology.

Method for the non-destructive testing of a stator winding insulation

A method for the non-destructive detecting of ageing symptoms of a component having regularly recurring structures, includes the following steps: a) scanning the component in the region of the recurring structures in a plurality of scanning planes which extend parallel to one another to create at least one scanning image set having a plurality of two-dimensional scanning images, wherein the scanning images show a plurality of inhomogeneities; b) automatically identifying those inhomogeneities that form recurring patterns, and those inhomogeneities that do not follow a recurring pattern, using a suitable algorithm; and c) detecting ageing symptoms exclusively on the basis of those inhomogeneities which are identified in step b) and do not follow a recurring pattern.

Method for the -destructive detecting of ageing symptoms of a component having regularly recurring structures

A water-cooled generator strip having at least two conductor stacks which are arranged parallel and in each case have a plurality of conductors arranged one above the other and electrically insulated from one another by a conductor insulation, wherein the conductors are secured geometrically relative to one another by a cured resin, and wherein between the conductor stacks a gap space is provided, in which at least one cooling channel is arranged for conveying cooling water.

Water-cooled generator strip having a cooling channel gap space

High-voltage insulation systems are simplified and can have a thinner design by the use of an external corona shielding system that may include an electrically conductive PTFE fabric. Thermal conductivity may also be improved.

Material for insulation system, insulation system, external corona shield and an electric machine

A corona shielding system for a high voltage machine including a sleeve for a live conductor of the high voltage machine, wherein the sleeve has an electrically conductive lacquer, wherein a filler is added to the conductive lacquer, the filler at least partially including a thermoexpanding filler, is provided. A repair lacquer and a method for production is further provided.

Corona shielding system for a high-voltage machine, repair lacquer, and method for production

An anhydride-free impregnating resin for an electrical insulation body, the impregnating resin has an epoxy resin, a curing agent and nanoscale and/or microscale inorganic particles. An impregnable electrical insulating tape for an electrical insulation body has a curing agent applied to the electrical insulating tape. A method includes producing an electrical insulation body An electrical insulation body includes an anhydride-free impregnating resin, where the impregnating resin has an epoxy resin, a curing agent and nanoscale and/or microscale inorganic particles.

Storage-stable impregnating resins and electrical insulating tapes

By using an electrically conductive PTFE fabric, high-voltage insulation systems are simplified and can be made thinner, also improving the thermal conductivity. The insulation material is in two layers, each with a hydrophobic and a hydrophobic region, and the hydrophobic regions of the layers are opposed.

Two-layer high-voltage insulation system and electrical machine

The corona shield can be applied in electric machines in a faster manner by using radiation-cured materials.

Method for producing a corona shield, fast-curing corona shield system, and electric machine

A compound having the structural formula RCORCOZnused as a reaction accelerator for the copolymerization of a mixture of a carboxylic acid anhydride and an oxirane, wherein Rand Rare a straight-chained or branched alkyl group independently of each other.

Reaction accelerator for a copolymerisation, electrical-insulation tape, electrical-insulation body, and consolidation body

An impregnating resin for an electrical insulation body includes a base resin, a filler having nanoscale particles, and a radically polymerizing reactive diluent. The impregnating resin includes a crosslinker for crosslinking the base resin and the reactive diluents. The base resin is an epoxy resin. An electrical insulation body includes the impregnating resin and a method produces the electrical insulation body by production of an impregnating resin having a base resin, a filler having nanosize particles and a free-radically polymerizing reactive diluent.

Impregnating resin for an electrical insulation body, electrical insulation body, and method for producing the electrical insulation body

A method and device for forming corona shielding on a winding bar for high-voltage machines has end corona shielding in a first section and outer corona shielding in a second section that adjoins the first section. The method includes providing a first composition, including a carrier material and a first filler therein and a first electrical resistance; providing a second composition, including the same carrier material and a second filler therein and a second electrical resistance, wherein the first and second fillers contain an identical dopable semiconductor material, doping of which determines electrical resistance of the first and second fillers, and wherein the second resistance differs from the first resistance; applying the first composition in the first section to form the end corona shielding; and applying the second composition in the second section to form the outer corona shielding.

Method and apparatus for forming corona shielding

Fewer insulation layers can be used by virtue of using hydrophobic electrically conductive materials around a main insulation around a conductive bar. There are several more layers of conductive and/or non-conductive material.

Winding layers composed of different materials

Growing community of inventors

Essen, Germany

Friedhelm Pohlmann