Patent application number | Description | Published |
20100227158 | SURFACE MODIFIED ELECTRICAL INSULATION SYSTEM WITH IMPROVED TRACKING AND EROSION RESISTANCE - Surface modified electrical insulation system including a hardened or cured synthetic polymer composition including at least one filler, wherein the surface of said synthetic polymer composition is modified by being coated with a thin coating. The thin coating is applied by a plasma enhanced chemical vapor deposition (PECVD) with a thickness within the range of about 50 nanometer to about 50 μm; and/or a by a sol-gel technique with a thickness within the range of about 0.5 micron to about 1 mm. The thin coat is an electrically non-conductive polymeric material having a melting point which is distinctly higher than the melting point or degradation temperature of the synthetic filler containing polymer composition. | 09-09-2010 |
20100227951 | POLYMER CONCRETE ELECTRICAL INSULATION - 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 (μm) to 100 micron (μm) [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 (μm) to 100 micron (μm) [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. | 09-09-2010 |
20110027532 | SURFACE MODIFIED ELECTRICAL INSULATION SYSTEM - A surface modified electrical insulation system having a super hydrophobic surface, the insulation system having a hardened or cured synthetic polymer composition which contains at least one filler material and optionally further additives. The at least one filler material can be selected from a group of filler materials containing inorganic oxides, inorganic hydroxides and inorganic oxyhydroxides. The surface of the electrical insulation system can be formed as a structured surface with micro-scale and nano-scale features, whereby the surface is covered with a liquid hydrophobic compound. | 02-03-2011 |
20110248808 | OUTDOOR DRY-TYPE TRANSFORMER - A three-phase dry distribution transformer adapted for mounting outdoors on a pad or to a utility pole. The distribution transformer includes one or more winding assemblies mounted to a ferromagnetic core. Each winding assembly includes a low voltage winding and a high voltage winding. In each winding assembly, an encasement comprised of an insulating resin encapsulates the low voltage and high voltage windings. The encasement includes a body and a pair of high voltage bushings and a pair of low voltage bushing. | 10-13-2011 |
20120111605 | CURABLE SOL-GEL COMPOSITION - Curable sol-gel composition useful for modifying the surface of a conventional electrical insulation system and providing said surface with an improved tracking and erosion resistance, wherein said sol-gel composition includes: (a) cyclo-aliphatic epoxy resin compound containing at least two 1,2-epoxy groups per molecule [component (a)]; (b) a glycidoxypropane-tri(C | 05-10-2012 |
20120202918 | CURABLE EPOXY RESIN COMPOSITION - A curable epoxy resin composition including at least an epoxy resin component and a hardener component, and optionally further additives, wherein: (a) the epoxy resin component is an epoxy resin compound or a mixture of such compounds; (b) the hardener component includes (b1) an aliphatic and cycloaliphatic or aromatic polycarbonic acid anhydride; and (b2) a polyether-amine of the general formula (I), H | 08-09-2012 |
20120208924 | EPOXY RESIN COMPOSITION - An exemplary curable epoxy resin composition is disclosed which includes at least an epoxy resin component and a hardener component, and optionally further additives, wherein (a) at least a part of the hardener component is a chemically modified polycarbonic acid anhydride; (b) an optional glycol or polyglycol; (c) or a compound containing two carboxylic groups is included; and (d) the chemically modified acid anhydride hardener is present in an amount comprising at least 10% of reactive hardening groups calculated to all the reactive hardening groups contained in the total amount of hardener component present in the epoxy resin composition. | 08-16-2012 |
20130043966 | TRANSFORMER TAP PROJECTION AND COVER - Tap covers and projections for an electrical device are provided. The tap projections have bosses or taps raised from a surface of the tap projection and encapsulated with a resin except for an outer surface of the bosses or taps. The tap projections may have a channel or recess between individual bosses or taps to prevent degradation of the insulation between the respective adjacent bosses or taps. When a tap cover is provided, it is pushed on or bolted to the tap projection. The tap cover may be provided for an individual tap or an entire tap projection and may be formed of a resin or an elastomeric material. The tap cover has a first generally planar surface and a second generally annular surface having a circumferentially-extending groove on an inside surface. The circumferentially-extending groove is located slightly beneath the second generally annular surface. The groove of the tap cover is designed to fully engage with a raised lip of a tap projection or individual tap of a transformer. Another embodiment of the tap cover has openings to receive epoxy-headed bolts that are used to connect the tap cover to the tap projection through the tap connectors. | 02-21-2013 |
20130162386 | CORROSION-RESISTANT COATING SYSTEM FOR A DRY-TYPE TRANSFORMER CORE - A protective coating system for application to exposed surfaces of a transformer core prevents corrosion of the core. The protective coating is suitable for use in industrial and marine environments where many factors impact the life of the transformer core. The protective coating comprises at least three coating layers. The first coating layer is an inorganic zinc silicate primer. The second coating layer is a polysiloxane. The third coating layer is a room temperature or high temperature vulcanizing silicone rubber. A silicone rubber sealant may be further applied to outer edge surfaces of the core. | 06-27-2013 |