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1. (WO2007007143) METHOD FOR LIFE EXTENSION OF CELLULOSE INSULATION IN POWER TRANSFORMERS OF ELECTRICAL APPARATUSES
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2007/007143    International Application No.:    PCT/IB2006/001815
Publication Date: 18.01.2007 International Filing Date: 28.06.2006
IPC:
H01B 3/20 (2006.01), H01B 3/48 (2006.01), H01G 4/22 (2006.01)
Applicants: SINVENT AS [NO/NO]; N-7465 Trondheim (NO) (For All Designated States Except US).
LUNDGAARD, Lars [NO/NO]; (NO) (For US Only)
Inventors: LUNDGAARD, Lars; (NO).
PAINTER, Terence, J.;
Agent: BRYN AARFLOT AS; Kongensgt 15, N-0153 Oslo (NO)
Priority Data:
0501705-8 13.07.2005 SE
Title (EN) METHOD FOR LIFE EXTENSION OF CELLULOSE INSULATION IN POWER TRANSFORMERS OF ELECTRICAL APPARATUSES
(FR) PROCEDE D'EXTENSION DE LA DUREE DE VIE D'ISOLATION EN CELLULOSE DANS LES TRANSFORMATEURS DE PUISSANCE D'APPAREILS ELECTRIQUES
Abstract: front page image
(EN)The present invention relates to a method for delaying the ageing, or lower the rate of degradation and loss of physical strength, of a cellulosic insulation e.g. used in an apparatus such as a power transformer, an electrical apparatus or an electrical cable. The invention is achieved by that at least two ageing inhibitors in the form of active chemical substances are added to the oil in the apparatus and at least partly be absorbed by the cellulosic insulation, a first active chemical substance is a buffer substance, such as oil soluble amines- or ammonium salts, and a second active chemical substance is an oil soluble alcohol, and thereby achieving a deceleration of both the acid hydrolyses process and the oxidation process resulting in a lower rate of cellulose degradation and maintaining the strength of the cellulosic insulation.
(FR)Procédé retardant le vieillissement ou diminuant le degré de dégradation et la perte de résistance physique, pour une isolation en cellulose, par exemple dans un appareil du type transformateur de puissance, appareil électrique ou câble électrique. Au moins deux inhibiteurs de vieillissement sous la forme de substances chimiques actives sont ajoutés à l'huile dans l'appareil et au moins partiellement absorbés par l'isolation. Une première substance active est une substance tampon, du type sels d'amine ou d'ammonium solubles, et une seconde substance active est un alcool soluble dans l'huile, et on ralentit ainsi à la fois les hydrolyses acides et les oxydations, ce qui diminue le degré de dégradation de la cellulose et maintient la résistance de l'isolation cellulosique.
Designated States: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BW, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LV, LY, MA, MD, MG, MK, MN, MW, MX, MZ, NA, NG, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SK, SL, SM, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW.
African Regional Intellectual Property Organization (BW, GH, GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IS, IT, LT, LU, LV, MC, NL, PL, PT, RO, SE, SI, SK, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG).
Publication Language: English (EN)
Filing Language: English (EN)