WO1999033068A1 - Cable electrique isole pour courant continu - Google Patents

Cable electrique isole pour courant continu Download PDF

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Publication number
WO1999033068A1
WO1999033068A1 PCT/SE1998/002313 SE9802313W WO9933068A1 WO 1999033068 A1 WO1999033068 A1 WO 1999033068A1 SE 9802313 W SE9802313 W SE 9802313W WO 9933068 A1 WO9933068 A1 WO 9933068A1
Authority
WO
WIPO (PCT)
Prior art keywords
insulated electric
electric device
oil
gelling additive
gelling
Prior art date
Application number
PCT/SE1998/002313
Other languages
English (en)
Inventor
Anna Kornfeldt
Johan Felix
Mikael Bergkvist
Per Nordberg
Christer TÖRNKVIST
Original Assignee
Abb Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Abb Ab filed Critical Abb Ab
Priority to KR1020007006837A priority Critical patent/KR20010033370A/ko
Priority to EP98964597A priority patent/EP1042761A1/fr
Priority to AU19889/99A priority patent/AU737130B2/en
Priority to JP2000525890A priority patent/JP2001527265A/ja
Publication of WO1999033068A1 publication Critical patent/WO1999033068A1/fr
Priority to IS5517A priority patent/IS5517A/is
Priority to NO20003242A priority patent/NO20003242L/no

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/20—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes

Definitions

  • the present invention relates to an insulated electric device, such as a direct current cable, a DC-cable, a transformer or a capacitor comprising a conductor and an insulation system.
  • the present invention relates in particular to an insulated electric DC cable for transmission and distribution of electric power.
  • the insulation system comprises a porous, fibrous and/or laminated body impregnated with a dielectric fluid.
  • transient voltages is a factor that has to be taken into account when determining the insulation thickness of DC cables. It has been found that the most onerous condition occurs when a transient voltage of opposite polarity to the operating voltage is imposed on the system when the cable is carrying full load. If the cable is connected to an overhead line system, such a condition usually occurs as a result of lightning transients.
  • a typical DC-transmission cable includes a conductor and an insulation system comprising a plurality of layers, such as an inner semi-conductive shield, an insulation body and an outer semi-conductive shield.
  • the cable is also complemented with casing, reinforcement, etc., to withstand water penetration and any mechanical wear or forces during production, installation and use.
  • Almost all the DC cable systems supplied so far have been for submarine crossings or the land cable associated with them.
  • the mass- impregnated solid paper insulated type of cable is chosen because there are no restrictions on length due to pressurizing requirements. It has been supplied for operating voltages of up to 450 kN.
  • a wound body comprising an essentially all paper tape, i.e.
  • a tape based on paper or cellulose fibers is used, but application of laminated tape materials such as a laminated polypropylene paper tape is being persued.
  • the wound body is typically impregnated with an electric insulation oil or mass.
  • a commercially available insulated electric DC-cable such as a transmission or distribution cable designed for operation at a high voltage, i.e. a voltage above 100 kN, is typically manufactured by a process comprising the winding or spinning of a porous, fibrous and/or laminated solid insulation based on cellulose or paper fiber followed by the impregnation with the electric insulating oil.
  • the impregnation which is typically carried out in batches after the insulation has been applied around the conductor, is time consuming and needs to be carefully monitored and controlled.
  • the process For impregnation of a DC-cable, where several kilometers of cable are impregnated with a typically viscous fluid, the process has a process cycle time extending over days or even weeks or months.
  • this time consuming impregnation process is made according to a carefully developed and strictly controlled process cycle with specified ramping of both temperature and pressure conditions in the impregnation vessel used during heating, holding and cooling to ensure a complete and even impregnation of the fiber-based insulation.
  • a transformer or a reactor for use in a DC-transmission network, at a power generating utility or at a large consumer installation such as an industrial plant also typically comprises porous, fibrous and/or laminated insulating bodies disposed around and between conductors.
  • preformed bodies such as so called pressboards, manufactured by de- watering and/or pressing a slurry comprising the fibers, are used.
  • the bodies are impregnated by a dielectric fluid to impart the desired electrical properties needed.
  • the impregnation of these bodies in a transformer although not time consuming, is a sensitive process and specific demands are put on the fluid, the medium to be impregnated and the process variables used for impregnation.
  • a capacitor exhibits a laminated structure with a dielectric medium comprising one or more polymeric films disposed between two electrodes. Typically, films of polyolefin or thermoplastic polyester are used.
  • the capacitor is typically impregnated with a dielectric fluid. The impregnation of the laminated structure of a capacitor, although not time consuming, is a sensitive process and specific demands are put on the fluid, the medium to be impregnated and the process variables used for impregnation.
  • the active part of the impregnated insulation systems described in the foregoing is the solid part, such as the cellulose fibers, the polymeric films or any laminate or tape used.
  • the dielectric fluid protects the insulation against moisture pick-up and fills all pores, voids or other interstices, whereby any dielectrically weak air contained in the insulation is replaced by the dielectric fluid.
  • a fluid exhibiting a low- viscosity is desired.
  • the fluid shall also preferably be sufficiently viscous at operation conditions for the electrical device to avoid migration of the fluid in the porous insulation, and especially away from the porous insulation.
  • Darcy's law (1) is often used to describe the flow of a fluid through a porous or capillary medium.
  • v Js £ ⁇ h
  • v is the so called Darcy velocity of the fluid, defined as the volume flow divided by the sample area
  • k is the permeability of the porous medium
  • ⁇ P is the pressure difference across the sample
  • ⁇ is the dynamical viscosity of the fluid
  • L is the thickness of the sample.
  • a fluid exhibiting a low- viscosity or a highly temperature dependent viscosity at operating temperature will thus show a tendency to migrate under the influence of temperature fluctuations naturally occurring in an electric device during operation, and also due to a temperature gradient building up across a conductor insulation in operation, and might result in the formation of unfilled voids in the insulation.
  • temperature fluctuations and temperature gradients will be expressed in a high- voltage DC cable, any problems associated with migration of the dielectric fluid must also be carefully considered.
  • Unfilled voids or other unfilled interstices or pores will in an insulation operating under an electrical high- voltage direct current field constitute a site where space charges tend to accumulate, thus risking the initiation of dielectric breakdown through discharges which will degrade the insulation and, ultimately, might lead to its breakdown.
  • the ideal dielectric should exhibit a low- viscosity under impregnation and be highly viscous under operation conditions.
  • Oils are therefore selected such that they are sufficiently viscous at expected operation temperatures to be essentially fully retained in the insulation also under the temperature fluctuations that occur in the electric device during operation, and also that this retention is unaffected of the temperature gradient that normally builds up over a conductor insulation for an electric device comprising conductors at high-voltage. This typically results in a high impregnation temperature to ensure that the insulation will be essentially fully impregnated.
  • a high impregnation temperature is disadvantageous as it risks affecting the insulation material, the surface properties of the conductor and promoting chemical reactions within and between any material present in the device, the insulation of which is being impregnated.
  • energy consumption during production and overall production costs will be negatively affected by a high impregnation temperature.
  • an oil as disclosed in US-A-3 668 128 comprising additions of from 1 up to 50 percent by weight of an alkene polymer with a molecular weight in the range 100-900 derived from an alkene with 3, 4 or 5 carbon atoms, e.g. polybutene, can be chosen for its low viscosity at low temperatures.
  • This oil exhibits a low viscosity at low temperatures, good oxidation resistance and also good resistance to gassing, i.e. the evolution of hydrogen gas which might occur, especially when an oil of low aromatic content, as the oil suggested in US-A-3 668 128, is exposed to electrical fields.
  • the fluid and the gelling polymer additive must be matched to optimize high temperature viscosity of the easy flowing Newtonian fluid, the low temperature viscosity of the gel and the transition temperature range to suit the desired properties both during impregnation and operation.
  • a cable comprising a dielectric fluid matched with a suitable polymer exhibits a substantial potential for reduction of the time period needed for impregnation, but it still requires a strictly controlled temperature cycle during impregnation.
  • the gelling polymer additive and the dielectric fluid are matched or optimized to, in the best way, meet the typically conflicting demands during impregnation and use of the cable.
  • EP-Al-0231 402 discloses a gel-forming compound with slow forming and thermally reversible gelling properties intended to be used as an encapsulant to ensure a good sealing and blocking of any interstices in a cable comprising an all solid insulation, such as an extruded polymer based insulation.
  • the slow-forming thermally reversible gel-forming compound comprises an admixture of a polymer to a naphtenic or paraffinic oil and also embodiments using further admixtures of a co-monomer and/or a block copolymer to an oil are considered suitable as encapsulants due to their hydrofobic nature and the fact that they can be pumped into the interstices at a temperature below the maximum service temperature of the encapsulant itself.
  • Similar gel-forming compounds for the same purpose i.e.
  • an insulated electric device such as a DC-cable, a transformer or a capacitor with an electrical insulation system comprising a porous, fibrous and/or laminated part insulated with a dielectric fluid.
  • a DC-cable it shall be suitable for use as a transmission and distribution cable in networks and installations for DC transmission and distribution of electric power.
  • the insulation system shall exhibit stable dielectric properties also when operating at high operation temperatures close to the impregnation temperature and/or under conditions where the insulation during operation is subjected to a high voltage direct current field in combination with thermal fluctuations and/or a build up of a substantial thermal gradient within the insulation.
  • the dielectric fluid, typically oil, employed for impregnation shall exhibit a high viscosity index such that it during impregnation has a sufficiently low viscosity, i.e. a viscosity deemed suitable and technically and economically favorable for impregnation, and that it after impregnation has a high viscosity and elasticity, i.e. a viscosity that ensures that the oil during operation will be essentially retained in the porous, fibrous and/or laminated insulation body at all temperatures within the range of temperatures for which the device is designed to operate.
  • the device shall thus in its insulation system comprise an oil with a sufficiently low viscosity prior to and during impregnation to ensure stable flow properties and flow behavior within these ranges, and which exhibits a substantial change in viscosity upon impregnation, i.e. a change in the order of hundreds of Pas or more.
  • An insulated device, such as a DC-cable, impregnated with an oil exhibiting such high viscosity index will provide an opportunity for a substantial reduction in the lengthy time consuming batch-treatment for impregnation of the insulation system, thereby providing a potential for a substantial reduction in the production time and thus the production costs.
  • the reliability, low maintenance requirements and long working life of conventional electric devices, such as DC-cables, comprising an impregnated paper- based insulation shall be maintained or improved. That is, the insulation system shall have stable and consistent dielectric properties and a high and consistent electric strength and, as an extra advantage, open for an increase in the electrical strength and thus allow an increase in operation voltages, improved handleability and robustness of the cable.
  • an insulated electric device comprising a conductor and a porous, fibrous and or laminated electrical insulation system impregnated with an oil, wherein the desirous features discussed in the foregoing are obtained.
  • a DC-cable comprising at least one conductor and an impregnated insulation system, where the insulation system comprises a solid electrically insulating dielectric part with a porous, fibrous and/or laminated structure impregnated with an oil
  • the insulation system comprises a solid electrically insulating dielectric part with a porous, fibrous and/or laminated structure impregnated with an oil
  • an oil comprising a gelling additive which exhibits a molecule having a polar part, group or segment.
  • the gelled network of longer and/or more branched polymer molecules or cross-linking bridges in the oil, formed through the gelling interaction between a gelling additive molecule and the oil and/or any other gelling additive molecule is characterized by the bonds developed in association with the polar part, group or segment of the gelling additive.
  • bonds will increase the viscosity index of the oil such that the gelled network in the oil of a DC-cable according to the present invention ensures the flow properties of a highly viscous and elastic gel at typical operation temperatures of a DC- cable and lower temperatures.
  • the oil preferably exhibits a thermoreversible transition between a highly viscous elastic gelled state at low temperatures, i.e. typical operation temperatures of a DC-cable and lower temperatures, and a easy flowing liquid state at higher temperatures, i.e. impregnation temperatures.
  • the bonds comprised in the gelled network are hydrogen bonds.
  • the gelling additive comprises non polar segments of linear or branched hydrocarbon chains and polar parts, groups or segments.
  • This combination is advantageous as it imparts surfactant properties or a surfactant character to the gelling additive.
  • the gelling additive has a capability to interact with the solid surfaces with its polar parts and with the oil with its non-polar parts.
  • This interaction of surfactant character with the solid parts of the insulation and the oil respectively results in an improved wetting which shortens the impregnation time. Whereby the oil penetration into voids and capillary interstices within the porous, fibrous and/or laminated structure can be increased.
  • This surfactant type of interaction between gelling additive molecules and the surface of the porous, fibrous and/or laminated structure and the oil, respectively, will also under other circumstances increase the oil retention within the porous, fibrous and/or laminated structure upon operation at a high temperature, fluctuating temperatures and/or under a substantial temperature gradient.
  • This surfactant type of properties of a gelling additive comprising polar and non-polar parts also provides for a physical bonding of particles to the gelled structure. It is in particular advantageous if dielectrically strong particles with a fine particles size, e.g. in the nanometer range can be incorporated into the gelled structure. Such incorporation of dielectrically strong particles of a fine particle size reinforces the gelled network and the total insulation system both mechanically and electrically.
  • a prior art DC-cable comprises an oil, e.g. a mineral oil, where the viscosity index is increased by a gelling additive, such as styrene-butadiene block copolymer.
  • a gelling additive such as styrene-butadiene block copolymer.
  • the oil viscosity is thereby modified in such a way that the oil can be thermo-reversibly gelled.
  • the thermoreversible gelling is caused by partial solubility of the block copolymer in the oil.
  • the styrene blocks aggregate and micelles are formed. These micelles result in a physical cross-linking of the oil, a gel is formed.
  • a DC-cable according to the present invention comprises a gelling additive that introduces hydrogen bonded networks in to the oil.
  • the gelling additives used in a DC-cable according to the present invention comprise polar segments/groups and non-polar segments. This structure also enables them to function as surfactants.
  • Another advantage of the systems used in a DC-cable according to the present invention is that their gelling kinetics open for a delayed significantly slower gelling if so desired, this delay can in some cases exceed 24 h. This results in a decreased shrinkage than for a DC cable comprising a gelling impregnant containing a block copolymer as the gelling will occur at a low temperature and while the oil during cooling remains an easy flowing liquid. As a consequence, the "post-filling" step is less problematic.
  • the DC-cable comprises an impregnant based on a mineral oil which typically comprises up to 20 % by weight of a gelling additive, or a gelator.
  • a gelling additive typically comprises up to 20 % by weight of a gelling additive, or a gelator.
  • Suitable gelators for use with a mineral oil based impregnant comprise;
  • a block copolymer comprising a polar block capable of forming hydrogen bonds, such as polyvinyl pyridine added to a content of up to 20 % by weight,
  • urea or di-urea compound added to a content of up to 20 % by weight, preferably in the range of from 1 to 20 % by weight,
  • an alkyl-l,3,5-benzenetricarboxamide added to a content of up to 20 % by weight, preferably in the range of from 1 to 20 % by weight, e.g. tri-(3,7-dimethyloctyl)-l,3,5- benzene tricarboxamide added to a content of up to 20 % by weight, preferably in the range of from 5 to 20 % by weight.
  • the DC-cable comprises an impregnant based on a vegetabilic oil with a gelator comprising compounds such as a urea or di-urea compound, a cellulose ether and/or ethyl cellulose.
  • a gelator comprising compounds such as a urea or di-urea compound, a cellulose ether and/or ethyl cellulose.
  • the cellulose ether is added to the oil in the range of from 2 to 10 % by weight and the ethyl cellulose in the range of from 2 to 10 % by weight.
  • the DC-cable comprises an impregnant based on a silicone oil with a gelator that comprises dibensylidene sorbitol in the range of from 1 to 15 % by weight.
  • the DC-cable according to the present invention typically comprises, from the center and outwards;
  • a conductor of any desired shape and constitution such as a stranded multi-wire conductor, a solid conductor or a sectional conductor;
  • the two semi-conducting shields are typically wound and impregnated insulation according to the present invention with a dielectric electrically insulating solid part exhibiting a porous, fibrous and/or laminated structure as described in the foregoing impregnated with an oil.
  • the cable can be complemented with reinforcing and a sealing compound or a water swelling powder for filling any interstices in and around the conductor, other metal/polymer interfaces may be sealed in order to prevent water from spreading along such interfaces.
  • the wound cable insulation is pre-treated with the gelator before impregnation.
  • the wound insulation can be soaked in or sprayed with a solution comprising a gelator, dried and thereafter impregnated, but is preferably wound from tapes that are already pretreated with gelling additives.
  • the tapes can have been pretreated already in the line for tape production, but the treatment can of course also have been done in a special treatment operation or in connection with the winding. This is the same for any type of tape, such as an all paper tape, an all polymer tape or a laminated tape of paper and polymeric films or different polymeric films or meshes, webs or nets.
  • Paper tapes can have been coated by spraying or immersing or otherwise contacting the paper with a solution comprising the gelling additive.
  • the gelling additive can have been added to polymeric films, tapes or the like by spraying or extruding the gelling additive on to the polymer.
  • a coating comprising the gelling additive can also have been co-extruded with the polymeric tape or film.
  • the transformation of the easy flowing dielectric fluid to a highly viscous gel can dependent of the combination of gelling additive and dielectric fluid be instant, slow or even delayed.
  • instant transformation is meant that the transformation is initiated directly as the gelling additive is contacted and dissolved by the dielectric fluid and that the transformation kinetics are such that the transformation is rapid.
  • the slow transformation is also typically initiated directly upon contact between fluid and gelling additive, but the transformation is slowed down by the kinetics of the dissolution and/or transformation.
  • a delayed transformation for up to 24 hours can typically be accomplished by the gelling systems, gelator and matched oil, used in DC-cables according to the present invention.
  • the gelling additive is unevenly distributed within the insulation such that following impregnation and gelling a viscosity gradient is present in the cable, whereby the viscosity preferably is increased inwards to the conductor.
  • a self-healing capability is accomplished, i.e. a damaged part of the insulation can be re- impregnated with fluid from other parts,
  • the cable has an insulation system that comprises a surfactant or blend of surfactants, thereby further enhancing the wetting during impregnation.
  • the surfactant can either be added to the solid part of the insulation prior to impregnation by a prefreatment or it can be comprised in the oil.
  • a gasabsorbing additive is included in the insulating system.
  • a suitable gasabsorbing additive is a low molecular polyiosbutene with a molecular weight less than 1000 g/mole.
  • a DC-cable according to the present invention is ensured long term stable and consistent dielectric properties and a high and consistent electric strength as good as, or better than for any conventional DC-cable comprising such impregnated porous, fibrous and/or laminated body. This is especially important due to the long life such installations typically are designed for, and the limited access for maintenance to such installations.
  • the special selection and matching of gelling additives, gelators, and oils, impregnants ensure the long term stable properties of the insulation system also when used at elevated temperatures, at excessive thermal fluctuations and/or under thermal gradients. This opens for a capability to allow an increase in the operation load both in regards of increased voltages and current densities.
  • a DC-cable according to the present invention is that it, due to the surfactant character of the gelators used in DC-cables according to the present invention, opens for a reduction in production time by enhanced wetting, which offers a possible shortened impregnation cycle.
  • the surfactant character of the gelling additive used in a DC-cable according to the present invention provides for a physical bond to polar surfaces such as the surfaces of the porous, fibrous insulation and also to fine dielectrically strong particles which thereby can be incorporated into the gelled structure. Such incorporation of dielectrically strong particles will reinforce and strengthen the insulation both mechanically and electrically.
  • the temperature sensitivity during production can be substantially reduced by a suitable selection and matching of oil and gelling additive, which opens for a delayed gelling, and thereby reduced sensitivity of the post-filling step.
  • Figure 1 shows a cross-section of a typical DC-cable for transmission of electric power comprising a wound and impregnated insulation according to the present invention. DESCRIPTION OF PREFERRED EMBODIMENTS, EXAMPLES.
  • the DC-cable according to the embodiment of the present invention shown in figure 1 comprises from the center and outwards;
  • first semi-conducting shield 11 disposed around and outside the conductor 10 and inside a conductor insulation 12;
  • the cable is further complemented with a reinforcement in form of metallic, preferably steel, wires outside the outer extruded shield 13, a sealing compound or a water swelling powder is introduced in a the interstices in and around the conductor 10.
  • the insulated electric device of the present invention is applicable for any arbitrary DC-cable with an insulation system comprising a solid porous or laminated part impregnated with a dielectric fluid or mass.
  • the application of the present invention is independent of conductor configuration. It can also be used with DC-cables having an insulation system of this type comprising any arbitrary functional layer(s) and irrespective of how these layers are configured. Its application to DC-cables of this type is also independent of the configuration of the system for transmission of electric power in which the cable is included.
  • the DC-cable according to the present invention can be a single multi-wire conductor DC-cable as shown in Figure 1, or a DC-cable with two or more conductors.
  • a DC-cable comprising two or more conductors can be of any known type with the conductors placed side-by-side in a flat cable arrangement, or in a two conductor arrangement with one first central conductor surrounded by a concentrically arranged second outer conductor.
  • the outer conductor is typically arranged in the form of an electrically conductive sheath, screen or shield, typically a metallic screen not restricting the flexibility of the cable.
  • a DC-cable according to the present invention is suitable for use in both bipolar and monopolar DC-systems or installations for transmission of electric power.
  • a bipolar system typically comprises two or more associated single conductor cables or at least one multiconductor cable, while a monopolar installation has at least one cable and a suitable current return path arrangement.
  • blends or gelling compositions exhibit a development of a stable network and a high liquid-gel transition temperature, in the range of from 50 °C for the system in example 1 to 100 °C for the system in example 3.
  • the results of these examples have shown that with these gelators added to an oil used for impregnation of a conductor insulation in an DC-cable according to the present invention, faster impregnation rates and lower impregnation temperatures can be employed compared to conventionally used gelling impregnants.
  • a block of bundled paper impregnated with the impregnants described in the examples given in this application behaves like an elastic body at temperatures below the transition temperature and the oil, at these temperatures, is fully retained in the porous, fibrous insulation and between the paper layers.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Insulating Materials (AREA)
  • Insulated Conductors (AREA)

Abstract

L'invention concerne un câble pour courant continu comportant au moins un conducteur et un système isolant imprégné. Le système isolant comporte une partie diélectrique pleine électro-isolante présentant une structure poreuse, fibreuse et/ou stratifiée imprégnée avec une huile comprenant un additif gélifiant. La molécule d'additif gélifiant, laquelle comprend une partie, un groupe ou un segment polaire, interagit avec l'huile et/ou toute autre molécule d'additif gélifiant pour former un réseau gélifié de molécules de polymère à chaîne plus longue et/ou plus ramifiée, ou bien des ponts de réticulation, dans l'huile qui présente ainsi les caractéristiques d'écoulement d'un gel hautement visqueux et élastique.
PCT/SE1998/002313 1997-12-22 1998-12-15 Cable electrique isole pour courant continu WO1999033068A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
KR1020007006837A KR20010033370A (ko) 1997-12-22 1998-12-15 절연 전기 직류 케이블
EP98964597A EP1042761A1 (fr) 1997-12-22 1998-12-15 Cable electrique isole pour courant continu
AU19889/99A AU737130B2 (en) 1997-12-22 1998-12-15 An insulated electric direct current cable
JP2000525890A JP2001527265A (ja) 1997-12-22 1998-12-15 電気絶縁性直流ケーブル
IS5517A IS5517A (is) 1997-12-22 2000-05-30 Einangraður rafjafnstraumskapall
NO20003242A NO20003242L (no) 1997-12-22 2000-06-21 Isolert elektrisk likestrømskabel

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9704828A SE514062C2 (sv) 1997-12-22 1997-12-22 Isolerad elektrisk likströmskabel
SE9704828-4 1997-12-22

Publications (1)

Publication Number Publication Date
WO1999033068A1 true WO1999033068A1 (fr) 1999-07-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1998/002313 WO1999033068A1 (fr) 1997-12-22 1998-12-15 Cable electrique isole pour courant continu

Country Status (12)

Country Link
EP (1) EP1042761A1 (fr)
JP (1) JP2001527265A (fr)
KR (1) KR20010033370A (fr)
CN (1) CN1285074A (fr)
AR (1) AR017935A1 (fr)
AU (1) AU737130B2 (fr)
ID (1) ID26407A (fr)
IS (1) IS5517A (fr)
NO (1) NO20003242L (fr)
SE (1) SE514062C2 (fr)
WO (1) WO1999033068A1 (fr)
ZA (1) ZA9811711B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6391447B1 (en) * 1997-12-22 2002-05-21 Abb Ab Method for manufacturing an electric device having an insulation system impregnated with a dielectric fluid
US6670554B1 (en) 2002-10-07 2003-12-30 Union Carbide Chemicals & Plastics Technology Corporation High-voltage direct current cable insulation
EP2254127A1 (fr) 2009-05-20 2010-11-24 Nexans Organogel pour couche d'isolation de câble électrique
WO2011073709A1 (fr) 2009-12-16 2011-06-23 Prysmian S.P.A. Câble en courant continu à haute tension doté d'une isolation stratifiée à imprégnation
EP3967721A1 (fr) 2020-09-10 2022-03-16 Nexans Fluide d'imprégnation pour câbles d'alimentation haute tension recouverts de papier

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2783373B1 (fr) * 2011-11-25 2015-11-18 ABB Research Ltd. Système de transmission de courant continu comprenant une couche d'isolation laminée à épaisseur contrôlée, ainsi que procédé de fabrication
CN104505170A (zh) * 2015-01-04 2015-04-08 北京亨通斯博通讯科技有限公司 光伏发电系统用通信电缆
CN107195371A (zh) * 2017-06-29 2017-09-22 江苏华亚电缆有限公司 抗开裂电缆
CN110283465B (zh) 2018-03-19 2022-10-14 日立能源瑞士股份公司 具有显示热可逆性油至凝胶转变的绝缘组合物的电容器

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US6391447B1 (en) * 1997-12-22 2002-05-21 Abb Ab Method for manufacturing an electric device having an insulation system impregnated with a dielectric fluid
US6670554B1 (en) 2002-10-07 2003-12-30 Union Carbide Chemicals & Plastics Technology Corporation High-voltage direct current cable insulation
US6924435B2 (en) 2002-10-07 2005-08-02 Union Carbide Chemicals & Plastics Technology High-voltage direct current cable insulation and semiconductive shield
EP2254127A1 (fr) 2009-05-20 2010-11-24 Nexans Organogel pour couche d'isolation de câble électrique
EP2254126A1 (fr) 2009-05-20 2010-11-24 Nexans Organogel pour couche d'isolation de câble électrique
WO2011073709A1 (fr) 2009-12-16 2011-06-23 Prysmian S.P.A. Câble en courant continu à haute tension doté d'une isolation stratifiée à imprégnation
US9595367B2 (en) 2009-12-16 2017-03-14 Prysmian S.P.A. High voltage direct current cable having an impregnated stratified insulation
EP3967721A1 (fr) 2020-09-10 2022-03-16 Nexans Fluide d'imprégnation pour câbles d'alimentation haute tension recouverts de papier

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ID26407A (id) 2000-12-21
SE9704828L (sv) 1999-06-23
NO20003242D0 (no) 2000-06-21
AR017935A1 (es) 2001-10-24
ZA9811711B (en) 1999-08-11
AU737130B2 (en) 2001-08-09
AU1988999A (en) 1999-07-12
SE9704828D0 (sv) 1997-12-22
KR20010033370A (ko) 2001-04-25
NO20003242L (no) 2000-06-21
CN1285074A (zh) 2001-02-21
IS5517A (is) 2000-05-30
JP2001527265A (ja) 2001-12-25
EP1042761A1 (fr) 2000-10-11
SE514062C2 (sv) 2000-12-18

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