EP0780848B1 - Gasaussendruckkabel - Google Patents
Gasaussendruckkabel Download PDFInfo
- Publication number
- EP0780848B1 EP0780848B1 EP96117181A EP96117181A EP0780848B1 EP 0780848 B1 EP0780848 B1 EP 0780848B1 EP 96117181 A EP96117181 A EP 96117181A EP 96117181 A EP96117181 A EP 96117181A EP 0780848 B1 EP0780848 B1 EP 0780848B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- external gas
- cores
- cable according
- sheath
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/06—Gas-pressure cables; Oil-pressure cables; Cables for use in conduits under fluid pressure
- H01B9/0622—Cables for use in conduits under gas-pressure
Definitions
- the invention relates to an external gas pressure cable according to the preamble of the main claim.
- Cables according to the generic term have long been known and proven. Their basic structure is, for example, in the publication 'Gas outside pressure cable' from Felten & Guilleaume Kunststofftechnike AG Cologne (1968).
- Such an external gas pressure cable has three mostly oval conductors each of a layered dielectric - preferably paper - are surrounded. This dielectric is with a viscous Impregnation impregnated. Each wire is covered by a metal jacket (usually a smooth lead pipe). These veins is in a closed pressure pipe, in which over a dry gas is constantly maintained at a pressure that the presses smooth lead coats onto the electrical insulation and thus contributing to the fact that the dielectric remains void-free.
- DE-GM 19 96 553 is a paper-insulated power cable known that soaked with an insulating liquid and with a corrugated metal tube is surrounded. On the metal jacket is from no gas pressure applied on the outside, so this power cable cannot be regarded as an external gas pressure cable.
- External gas pressure cables have a number of advantages but the disadvantage that their energy transfer ability is strong is restricted. This is due to those occurring in the pressure pipe (steel) Additional losses and the fact that with the electrical Insulation no very high field strengths can be mastered. External gas pressure cables were previously mainly in the 110 kV voltage level used. The highest transmission power remains with these below 150 MVA. If the wish arises, to transmit more than 150 MVA with them, it would have to forced cooling is introduced or the voltage is increased become. As already mentioned, the dielectric is not so high quality that a significant increase in tension possible is.
- the invention is therefore based on the task of insulation to strengthen the cable cores so that higher voltages are permitted can be.
- the task is carried out by an external gas pressure cable with the features of the main claim solved.
- the invention consists essentially in that as a soaking agent low-viscosity insulating oil is used for the dielectric and that each wire is individually covered by a metallic corrugated jacket (preferably made of stainless steel) is hermetically sealed against the environment.
- the corrugated coat acts like one elastic membrane and transfers the external pressure to the inside, so that insulating oil and dielectric hydrostatically from external pressure be charged. Because of the thin liquid of the insulating oil does this cable work even with particularly thick insulation layers, whereas with viscous insulating oils with increasing Thickness of paper insulation the safe operation of the Cable is no longer guaranteed.
- the proposed cable can handle voltages of 400 kV or be used more.
- the dielectric can be built up with conventional papers, however, sandwich papers can also be used.
- the proposed design makes all thermal changes with, without changing the insulation property and this at electric field strengths, as at voltage levels of 400 kV or more are present.
- the inductive jacket losses in the stainless steel pipes are be smaller than in conventional lead coats because the Wall thickness can be chosen less than with lead coats.
- the wire is then dried and soaked under the corrugated jacket.
- the ends of the corrugated pipe must then be closed in this way that they are gas-tight and that it is ensured that the corrugated tube is completely filled hydrostatically.
- the wires sealed in this way are placed in pressure-resistant steel pipes on site moved in.
- a dry gas mainly nitrogen; SF6 is also suitable.
- the gas is under one Pressure set at about 1.5 MPa. With appropriate dimensioning this ranges from the diameter and wall thickness of the corrugated pipes Pressure in order to create a pressure of Build up 0.5 to 1.0 MPa. To maintain this operating pressure So no oil make-up is required.
- the gas pressure is applied by gas feed at the cable ends.
- the cores can be stranded, whereby if necessary also cooling tubes of a bundle cooling system pulled in can be.
- the pull-in process changes for such cables not in the outer pipe compared to conventional gas pressure cables.
- the bandage in this case the stranded veins holds together, protects the cable during the pulling process.
- the cable sections are connected via sleeves.
- the sleeves do not need a metallic corrugated jacket, a smooth rigid Metal sheath is sufficient because the sleeve comes out of the cable area is kept under oil pressure.
- the sleeves are suitable for this connected to the cable.
- the outer steel pipe is at these assembly points locked after fitting the sleeve.
- the invention is illustrated in a figure, which is a cross section is drawn by the external gas pressure cable.
- the conductors 1 of the cable are Milliken conductors with smoothed conductors executed.
- the insulation 2 consists of thin Insulated paper. Located above the insulation 2 the usual electrical shielding.
- Each wire 5 is in one Stainless steel corrugated pipe 4 retracted.
- the three wires 5 are in one Reinforcement 7 integrated and form a core connection 8.
- the core connection 8 lies in an outer steel tube 14, which is provided with corrosion protection 16 on the inside.
- the interior 9 of the tube 14 is filled with compressed gas. As a pull-in aid and to ensure an even distance from the outside Steel tube 14 lie between the core assembly 8 and the outer tube 14 spacer rollers or spacer balls 10.
- the rollers or balls should be made of non-magnetic material.
- the pulling aid is shown schematically in the figure.
- the rollers or balls can be executed in a bearing shell 11 be attached to the core.
- An alternative would be spacer balls or rolls 10 at about an angular distance of 120 ° to arrange a ring.
- the ring is then the carrier for the cage-like Bearing cups, similar to a ball bearing.
Landscapes
- Gas Or Oil Filled Cable Accessories (AREA)
- Cable Accessories (AREA)
Description
- Es werden nur kurzfristig Grabenöffnungen über kleine Strecken benötigt.
- Eventueller Rohrvortrieb ist ohne Grabenöffnung denkbar.
- Ein Kabelaustausch ist auch ohne Grabenöffnung vorstellbar.
- Das Kabel weist durch das dickwandige Außenrohr einen sehr hohen mechanischen Schutz auf.
- Durch das dickwandige äußere Stahlrohr werden die magnetischen Felder in der Kabelumgebung auf absolut unbedenkliche Größen herabgesetzt.
Claims (10)
- Gasaußendruckkabel mit mindestens einer Ader, deren Leiter (1) von einem geschichteten Dielektrikum (2) umgeben ist, welches mit einem Tränkmittel imprägniert ist, wobei die mindestens eine Ader mit einem metallenen Druckmantel (4) umgeben ist und die Adern insgesamt als Aderverbund (8) in einem druckfesten Rohr (14) untergebracht sind, in dem ständig ein Druck größer als 1 MPa durch Gas aufrecht erhalten wird, dadurch gekennzeichnet, daß der metallene Druckmantel (4) für jede Ader (5) als Wellmantel ausgebildet ist, der innerhalb des druckfesten Rohres (14) hermetisch verschlossen ist,
daß als Tränkmittel dünnflüssiges Isolieröl eingesetzt wird und daß Durchmesser und Wandstärke des Druckmantels (4) so gewählt sind, daß der Druck innerhalb des Druckmantels (4) hydrostatisch vom Gasaußendruck abhängig ist. - Gasaußendruckkabel nach Anspruch 1, dadurch gekennzeichnet, daß der Druckmantel (4) aus Edelstahl ausgebildet ist.
- Gasaußendruckkabel nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß als Dielektrikum (2) Papier oder Sandwichpapier eingesetzt ist.
- Gasaußendruckkabel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß falls die Adern mehrzahlig sind die Adern (5) miteinander verseilt sind.
- Gasaußendruckkabel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Adern (5) oder der Aderverbund (8) mit einer Einziehbandage umgeben sind.
- Gasaußendruckkabel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Aderverbund (8) oder die Adern (5) mit einer Vorrichtung (10, 11) zur Fixierung eines festen Abstands zum druckfesten Rohr (14) umgeben sind.
- Gasaußendruckkabel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß zusammen mit den Adern (5) oder dem Aderverbund (8) Bündelkühlrohre (6) im druckfesten Rohr (14) liegen.
- Gasaußendruckkabel nach Anspruch 7, dadurch gekennzeichnet, daß die Bündelkühlrohre (6) zusammen mit den Adern (5) von einer Armierung (7) zusammengehalten werden.
- Gasaußendruckkabel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Enden der Adern (5) zur Befestigung von Ziehwerkzeugen ausgebildet sind.
- Gasaußendruckkabel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Druckmantel (4) für jede Ader (5) so mit den Muffen des Kabels verbunden ist, daß sich der Druckraum auch auf die Muffen erstreckt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19547230 | 1995-12-18 | ||
DE19547230 | 1995-12-18 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0780848A1 EP0780848A1 (de) | 1997-06-25 |
EP0780848B1 true EP0780848B1 (de) | 2002-12-18 |
Family
ID=7780443
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96117181A Expired - Lifetime EP0780848B1 (de) | 1995-12-18 | 1996-10-25 | Gasaussendruckkabel |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0780848B1 (de) |
DE (2) | DE59610003D1 (de) |
NO (1) | NO964534L (de) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1549940A (de) | 1967-05-23 | 1968-12-13 | ||
DE1640122A1 (de) * | 1968-03-07 | 1970-05-21 | Felten & Guilleaume Carlswerk | Elektrisches Druckkabel Elektrisches Druckkabel |
DE2341021B2 (de) * | 1973-08-14 | 1977-07-21 | Kabel- Und Lackdrahtfabriken Gmbh, 6800 Mannheim | Hochspannungskabel |
DE2658816A1 (de) * | 1976-12-24 | 1978-07-06 | Felten & Guilleaume Carlswerk | Hochleistungs-uebertragungssystem aus mindestens einem hochleistungskabel mit innerer wasserkuehlung |
-
1996
- 1996-10-25 DE DE59610003T patent/DE59610003D1/de not_active Expired - Fee Related
- 1996-10-25 EP EP96117181A patent/EP0780848B1/de not_active Expired - Lifetime
- 1996-10-25 DE DE19644494A patent/DE19644494A1/de not_active Withdrawn
- 1996-10-25 NO NO964534A patent/NO964534L/no not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
DE19644494A1 (de) | 1997-06-19 |
DE59610003D1 (de) | 2003-01-30 |
NO964534D0 (no) | 1996-10-25 |
NO964534L (no) | 1997-06-19 |
EP0780848A1 (de) | 1997-06-25 |
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