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Solnechnogorsk, Russia

Zueva V.,NPO Stekloplastik | Sumovskaya G.,State Enterprise Plant Elektrotyazhmash | Stepanova T.,State Enterprise Plant Elektrotyazhmash
Conference Record of IEEE International Symposium on Electrical Insulation | Year: 2010

Semiconducting fiberglass tapes were developed in order to achieve a stable, heat-resistant, chemically homogeneous semiconducting material with electrical resistance, which would be independent of the probability of the distribution of semiconducting fillers (such as carbon-black or SiC) in the dielectric binders, and in order to avoid the influence on the material resistance of the binder thickening degree during manufacture of the winding and the aging in operation. The semiconducting properties of fiberglass were achieved by introducing metal oxides into the glass mixture. This material does not contain the capacitive interlayers in its semiconducting structure and does not overheat under a high frequency voltage component. It is expedient to use it for anti-corona system of the windings, which have been exposed to voltage with high frequency harmonics. Semiconducting fiberglass tapes can be obtained with a preassigned value with magnitude of dispersion of the resistance within half an order of magnitude, either as low resistance semiconducting tape LSP-O-1 for slot parts anti-corona protection or high resistance semiconducting tapes LSP-O-2 for the end turns of high voltage windings. The resistance remains stable up to 180 C. The tapes LSP-O can be produced with thickness of 0.1; 0.15; 0.2 mm. Tapes LSP-O-2 have been applied as high resistance layers for anti-corona protection at seven turbo generators 300 MW with windings of 20 kV, which have been successful in operation for more then 25 years. Tapes LSP-O-1 have been widely used as anti-corona protection for slot parts in smaller generators and high voltage motors with windings of 6.0 - 10.5 kV, which were manufactured by VPI process "Monolit", because insulation compounds penetrate easily through the tapes. Tapes LSP-O have the highest stability to the action of the cycles of cryogenics temperatures. This material remained with the same ranges of the magnitude of electrical resistance at 77K, and at 4.2K too, when traditional semiconducting composite materials lost their conductivity. It was discovered that the LSP-O began to take on some non-linearity of electrical resistance from electrical field stress at 4.2K. ©2010 IEEE.

Demina N.M.,NPO Stekloplastik | Titova O.N.,NPO Stekloplastik | Zabrodina I.P.,NPO Stekloplastik
Glass and Ceramics (English translation of Steklo i Keramika) | Year: 2013

The possibility of increasing the anhydride epoxy bonding agent impregnability of glass fabric, made from aluminum borosilicate glass, by introducing adhesives into the serially produced lubricant 4s is studied. A wide range of wetting agents, produced by different global manufacturers for fiber and organosilicon coupling agents, was tested by determining the bonding agent impregnability over the height in a capillary. The impregnability of reinforcing glass fabric was increased considerably by improving the lubricant as well as counter-modification of the bonding agent. © 2013 Springer Science+Business Media New York.

Beletskii B.I.,Mendeleev University of Chemical Technology | Trofimov A.N.,NPO Stekloplastik | Sventskaya N.V.,Mendeleev University of Chemical Technology | Zhuravleva N.V.,Mendeleev University of Chemical Technology | Pilepenko O.S.,NPO Stekloplastik
Glass and Ceramics (English translation of Steklo i Keramika) | Year: 2013

The process of making float-glass in large-tonnage glassmaking furnaces is analyzed. The optimal values of the rate and duration of melting and cooling of the molten glass are determined. It is shown that the melting time of the glass is 48 - 72 h and depends on the content of the cullet in the batch. The glass melt remains chemically and structurally uniform with cooling rates 10 - 12 K/h and cooling times 20 - 24 h, which yields glass of optimal quality. © 2013 Springer Science+Business Media New York.

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