摘要:
The present invention relates to a power transformer/inductor comprising at least one winding. The windings are designed by means of a high voltage cable (10), comprising an electric conductor, and around the conductor there is arranged a first semiconducting layer (14), around the first semiconducting layer (14) there is arranged an insulating layer (16) and around the insulating layer (16) there is arranged a second semiconducting layer (18). The second semiconducting layer (18) is directly earthed at both ends of each winding (221, 222) and furthermore at least at two points per turn of every winding (221, 222), whereby one or several points are indirectly earthed.
摘要:
A composition suitable for use as electrical insulation comprises a polymeric component and a water tree retardant additive which is (A) an organo orthoborate or partial ester of boric acid having the general formula B(OR)(OR¹)(OR²) in which R is an alkyl, aryl, aralkyl, alkaryl or cycloalkyl group having from 4 to 24 carbons and R¹ and R² are individually hydrogen or an alkyl, aryl, aralkyl, alkaryl or cycloalkyl group having from 4 to 24 carbon atoms or (B) an organo orthoborate or partial ester of boric acid with a polyhydric hydrocarbyl alcohol.
摘要:
The magnetic circuit of synchronous compensator plant is included in an electric machine which is directly connected to a high supply voltage of 20-800 kV, preferably higher than 36 kV. The electric machine is provided with solid insulation and its winding(s) is/are built up of a cable (6) intended for high voltage comprising one or more current-carrying conductors (31) with a number of strands (36) surrounded by at least one outer and one inner semiconducting layer (34, 32) and intermediate insulating layers (33). The outer semiconducting layer (34) is at earth potential. The phases of the winding are Y-connected, and the Y-point may be insulated and protected from over-voltage by means of surge arresters, or else the Y-point is earthed via a suppression filter. A procedure is used in the manufacture of a synchronous compensator for such plant, in which the cable used is threaded into the openings in the core for the magnetic circuit of the synchronous compensator.
摘要:
A rotating electric machine for direct connection to all types of high-voltage networks, in which the magnetic circuit adapted for high voltage comprises a rotor, stator and windings. The winding comprising a conductor surrounded by a solid insulation system. The invention also relates to a method for manufacturing the same.
摘要:
In a plant intended for driving traction motors e.g. railway locomotives or motor coaches, and which possibly comprises one or more electric machines provided with insulated conductors, the magnetic circuit in the traction motor(s) and/or in at least one of the other electric machines is connected directly to a high supply voltage of 21-800 kV, preferably higher than 36 kV. The insulation in each traction motor and other electric machines is built up of a cable (6) forming its winding, said cable (6) comprising one or more current-carrying conductors (31) with a number of strands (36), surrounded by at least two semiconducting layers (32, 37) and intermediate insulating layers (36). The traction motor(s) may be connected to the distribution network supplying the supply line of the railway without any other electric machine connected between, or via one or more of said other electric machines. The locomotive/motor coach may thus be constructed with only traction motor(s) without any other electric machine.
摘要:
Zum Fixieren der Leiter und Spulen von Wickelköpfen und zum Ausfüllen von Zwischenräumen in den Wickelköpfen elektrischer Maschinen werden Kordeln verwendet, die aus Fasern aufgebaute, zusammendrückbare Lunten (1), die von einer elastischen, für Imgrägnierharz durchlässigen Umhüllung (2) umgeben sind, aufweisen. Das Distanzierungsmittel wird mit einer im Vergleich zu den auszufüllenden Distanzen grösseren Dicke in die Wickelköpfe eingebracht. Die Imprägnierung der Kordeln erfolgt nach dem Einziehen. Zur Verbesserung des Endenglimmschutzes werden die Kordeln vor dem Einziehen mit einem für das Imprägnierharz durchlässigen, leitfähigen Tränkmittel behandelt.
摘要:
A cable insulated with a cross-linked polyethylene layer is described, wherein the cross-linked polyethylene is prepared by cross-linking with 2,5-dimethyl-2,5-di(tert- butylperoxy)hexane or 2,5-dimethy)-2,5-di(tert-buty)peroxy)-hexyne-3 as a cross-linking agent. Even if voltage is applied at high temperatures, the breakdown voltage of the cable can be maintained at a high level.
摘要:
The present invention relates to a power transformer/reactor (14, 15, 16) for high voltages, comprising at least one winding having at least one current-carrying conductor. The winding comprises a solid insulation (7) surrounded by outer and inner layers (8, 6) serving for equalization of potential and having semiconducting properties. The layers (6, 8) and the insulation (7) adhere along essentially the whole of its contact surfaces. Said conductor is arranged interiorly of the inner semiconducting layer (6). The outer layer (8) is connected to ground or otherwise relatively low potential. Said solid insulation in the windings constitutes substantially the total electrical insulation in the power transformer/reactor.
摘要:
The present invention relates to a rotating asynchronous converter and a generator device. The converter comprises a first stator connected to a first AC network with a first frequency (f1), and a second stator connected to a second AC network with a second frequency (f2). The converter also comprises a rotor means which rotates in dependence of the first and second frequencies (f1, f2). The stators each comprise at least one winding, wherein each winding comprise at least one current-carrying conductor, and each winding comprises an insulation system, which comprises on the one hand at least two semiconducting layers, wherein each layer constitutes substantially an equipotential surface, and on the other hand between them is arranged a solid insulation.