Abstract:
A method of making sand casting moulds with a protective coating for a multiple process of reactive moulding of insulation components and products made by filling up a mould cavity with polymer materials, including composites, based particularly on epoxy resins or composites based on cellulose materials, the method wherein the process of infiltration of the mould structure is performed chemically by soaking through the raw mould structure with chemosetting or thermosetting material. The application of a protective layer on external surfaces of a sand casting mould is done by means of any spraying, immersion or deposition method, whereas material with anti-adhesive properties is used for the protective coating in the form of organic chemosetting, thermosetting, light-curing material or in the form of inorganic material, including metal.
Abstract:
A method of making sand casting moulds with a protective coating for a multiple process of reactive moulding of insulation components and products made by filling up a mould cavity with polymer materials, including composites, based particularly on epoxy resins or composites based on cellulose materials, the method wherein the process of infiltration of the mould structure is performed chemically by soaking through the raw mould structure with chemosetting or thermosetting material. The application of a protective layer on external surfaces of a sand casting mould is done by means of any spraying, immersion or deposition method, whereas material with anti-adhesive properties is used for the protective coating in the form of organic chemosetting, thermosetting, light-curing material or in the form of inorganic material, including metal.
Abstract:
The subject of the invention is an enclosure for secondary distribution modular switchgears, applicable in protecting switchgears both against adverse weather conditions and against unauthorized inspections of high, medium and low voltage switch gear, and also against accidental access by unauthorized persons, or by wild animals and birds. The inventive enclosure containing a base-frame (3) to which the enclosure walls are attached and which is provided with a roof cover is characterized in that the base frame (3) is formed by a metal truss and contains two extreme base-frame modules, the left one (20) and the right one (23,) and at least one middle module (21 and/or (22) which are connected with one another by means of a pair of permanent connections formed by a socket (27a) and a prong (27b) and fastening and earthing plates (28a, 28b).
Abstract:
The subject of the invention is a surge arrester, and especially a low- voltage surge arrester. The surge arrester is applicable in protecting AC and DC low-voltage networks against multiple lightning surges and switching overvoltage. The surge arrester is characterized in that it contains at least one oxide varistor (1) housed in an insulating casing (4), connection terminals (2) and (3) and a visual fault indicator (6) which is made of material that changes its state of aggregation at a temperature exceeding that defined as a safe operating temperature of the surge arrester.
Abstract:
The subject of the invention is a method of recovery of metal parts from waste products or semi-finished products of the electric power and electronic industries, which parts are sealed in thermosetting and/or thermoplastic materials or their combination. The inventive method is characterized by carrying out pyrolysis of the waste material in a pyrolytic reactor and then subjecting the solid post-process residue of the pyrolysis process to the process of gasification followed by the process of burning out in a burnt-out chamber located in the lower part of the pyrolytic reactor or outside it. The final solid residue of the gasification and burn-out processes is removed from the burn-out chamber and mechanically segregated.
Abstract:
A method of making sand casting moulds with a protective coating for a multiple process of reactive moulding of insulation components and products made by filling up a mould cavity with polymer materials, including composites, based particularly on epoxy resins or composites based on cellulose materials, the method characterised in that the process of infiltration of the mould structure is performed chemically by soaking through the raw mould structure (1) with chemosetting or thermosetting material. The application of a protective layer (3) on external surfaces of a sand casting mould is done by means of any spraying, immersion or deposition method, whereas material with anti-adhesive properties is used for the protective coating in the form of organic chemosetting, thermosetting, light-curing material or in the form of inorganic material, including metal.
Abstract:
The subject of the invention is a capacitive insulating core of a highvoltage bushing applicable in electric power equipment, and especially in power transformers. The inventive core is formed by winding layers of electrically insulating material around a cylindrical mandrel, between which layers there are inserted at certain intervals sheets of conducting material shaping the electric field in the bushing. At least one sheet of conducting material that is placed in the core between the layers of the electrically insulating material is a structure made on the basis of paper or woven or unwoven fabric containing conducting particles suspended in it forming a percolative network electrically conducting in the sheet plane.