EP2259271B1 - Hochspannungsdrehstromsystem - Google Patents

Hochspannungsdrehstromsystem Download PDF

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Publication number
EP2259271B1
EP2259271B1 EP20100005479 EP10005479A EP2259271B1 EP 2259271 B1 EP2259271 B1 EP 2259271B1 EP 20100005479 EP20100005479 EP 20100005479 EP 10005479 A EP10005479 A EP 10005479A EP 2259271 B1 EP2259271 B1 EP 2259271B1
Authority
EP
European Patent Office
Prior art keywords
conductor
cable
current system
metal
alternating current
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.)
Not-in-force
Application number
EP20100005479
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2259271A2 (de
EP2259271A3 (de
Inventor
Hans-Peter May
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NKT Cables GmbH and Co KG
Original Assignee
NKT Cables GmbH and Co KG
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
Priority claimed from DE102009024149A external-priority patent/DE102009024149A1/de
Application filed by NKT Cables GmbH and Co KG filed Critical NKT Cables GmbH and Co KG
Publication of EP2259271A2 publication Critical patent/EP2259271A2/de
Publication of EP2259271A3 publication Critical patent/EP2259271A3/de
Application granted granted Critical
Publication of EP2259271B1 publication Critical patent/EP2259271B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/30—Insulated conductors or cables characterised by their form with arrangements for reducing conductor losses when carrying alternating current, e.g. due to skin effect
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H01B9/029—Screen interconnecting circuits

Definitions

  • the invention relates to a high-voltage three-phase current system and one-wire electric cable with integrated electromagnetic shielding for the high-voltage three-phase system.
  • the effort can also be described as significant - as with the shielding of cables with a steel pipe or in a steel box ( WO 2004/034539 ; EP 1598911 A1 ) - and with adverse effects on additional losses and ampacity.
  • Another design is to provide the leads of a three-conductor cable with a sheath of high permeability material directly ( DE 102006013553 B3 ).
  • the said constructions have the disadvantage that either the transmission power of the cable is limited and / or high electrical additional losses are present.
  • the object of the invention to present a variant in which a highly effective electromagnetic shield is integrated into the construction, the loss contribution is greatly reduced, while maintaining effective magnetic shielding.
  • the inventive construction for reducing the electrical loss contribution in the metal shield of single-core cables in a high-voltage three-phase system is that instead of a cable shield with 'usual' cross-section a much larger cross-section, preferably selected from good electrically conductive material for the metal shield, thus the conductance of the cable shield the otherwise usual in cables values is increased, the metal sheds have at their ends contact means for contacting the metal shades with each other.
  • a metal screen which has an increased electrical conductance compared to conventional cables, screen currents are inducible, which lie in the limit in the amount of cable conductor current.
  • An upper limit provides at most the technical limit of the current carrying capacity of the cable.
  • the metal screen is arranged radially above the single conductor cable and has a corresponding electrical conductance or a corresponding conductor cross section, so that shield currents of the stated order of magnitude can be induced.
  • the metal screen cross-section may also be considered.
  • Conductance and conductor cross-section are proportional physical quantities. Equivalent are thus statements in which either increased screen cross-section or increased conductance of the metal screen is spoken.
  • the metal screen can also be designed in the form of a reinforcement.
  • As a material for the metal shield are conductor metals such as copper or aluminum in question.
  • the metal screen can be contacted - either inside or outside - with a formed as a film or tape winding metallic contact layer, preferably made of aluminum.
  • the contact layer serves on the one hand as a cross-connector which balances the conductivity between the elements of the metal screen and on the other hand as a water vapor barrier.
  • one choice may be made at the upper limit or rather at the lower limit of said area of the metal screen.
  • costly lead metals for low-cost metals (e.g., copper vs. aluminum)
  • cross-sectional differences are 1.6 times, which is the difference in conductivities of the two metals.
  • Using a material with high electrical conductivity would limit the mass of the metal screen.
  • the electrical conductivity of the metal screen may be in the range 80% to 150% of the electrical conductivity of the cable ladder.
  • the electrical conductivity of the metal screen can also be selected equal to the electrical conductivity of the cable ladder.
  • the metal screen may consist of metallic single wires or of a metal layer, wherein a layer structure is formed as a tube.
  • the individual wires forming a metal screen may be applied with impact or consist of a mesh of the individual wires.
  • the metal shield with increased conductance can be arranged as a reinforcement, or it can be arranged on a support tube, the metal shield, in each of which a single conductor cable is retracted with plastic insulation.
  • a support tube construction could have approximately the following dimensions: Diameter of a tube made of plastic about 25 cm for pulling a cable core; Forming the metal screen made of aluminum either as a wire mesh or as a cylindrical layer on the pipe with a thickness that exceeds the conductor cross-section of the cable ladder (for example, 2500 mm 2 aluminum) (cross section depending on the targeted loss contribution reduction 3000 to 4000 mm 2 aluminum).
  • the principle of ferromagnetic shielding in the embodiment carrier tube here consists of a plastic tube for laying or drawing of three-phase cable cores with a conductive layer (also reinforcement) of large cross-section and with overlying magnetically permeable, preferably highly permeable material. Extremely high shielding factors can be achieved, which can be used to meet particularly stringent magnetic field restrictions.
  • the inventively constructed metal screen is wrapped with a high-permeability harness seamlessly.
  • a high-permeability harness for the harness is preferably used: overlapping wound, thin bands of a special steel, which have a relative permeability of some 10,000. In addition to their high magnetic shielding effect, these bands are characterized by low eddy current and magnetic reversal losses.
  • the harness should be protected against corrosion, so be covered with a corrosion protection layer.
  • this type of cable allows extremely high shielding factors to be achieved, with which all conceivable conditions for limiting the magnetic field can be met.
  • the structures of the invention provide in areas where the guiding of the cables in a steel pipe is mandatory - such as when crossing under train facilities - a way to lay the individual cable core in a steel pipe, which without this construction due to the then extreme power heat losses is inadmissible.
  • the three-phase high-voltage three-phase system consists of three single-conductor cables, preferably in a single-plane arrangement, with the three metal sheds (either the single-core cables or the support tubes) being short-circuited at both ends.
  • the three metal sheds either the single-core cables or the support tubes
  • the three metal sheds By short-circuiting the three metal sheds at both ends, currents are induced in them which are (nearly) opposite to the respective conductor currents and whose size approaches the conductor current (asymptotically) with increasing cross-section or increasing conductance of the metal screen.
  • a cable conductor 12 is a plastic insulation 14 with inner and outer conductive layer.
  • a metal screen 20 with a much larger conductance, or cross-section (made of copper or aluminum) is used.
  • the cable construction of the metal shield 20 corresponds to the usual reinforcement or reinforcement.
  • the metal screen which is preferably formed from wires, is contacted, either inside or outside, with a contact layer 18, preferably made of aluminum, in the form of a film or tape winding.
  • the contact layer serves on the one hand as a water vapor barrier and on the other hand as a cross-connector which balances the conductivity between the elements of the metal screen.
  • the metal screen 20 is wrapped with a high permeability harness 22.
  • Such electrical bands as used in transformer and electrical engineering are made of low silicon silicon steel sheet and are made in a thickness of 0.02 to 0.04 mm. Outwardly, the construction becomes finished with a protective jacket 24, in particular with corrosion protection.
  • the insulation of the cable ladder is preferably made of VPE, wherein an inner and an outer conductive layer - as usual - is present.
  • Fig. 1B is a laying or support tube 15 is shown, in each of which a single conductor cable is drawn without metal shield.
  • the reference numerals used correspond to the same parts as in FIG Fig. 1A , This embodiment is particularly suitable for shorter laying lines, where the support tube is laid in advance, and the cable is retracted later.
  • the metal screen 20 and the harness 22 on the support tube 15 are therefore here at a small distance from the cable and not directly on the cable insulation.
  • the two features used for magnetic shielding according to the invention are thus a metal screen with a large conductor cross-section and a strapping applied from high-permeability material. With such a construction, regardless of the pitch of the cable cores, extremely high shielding factors can be achieved.
  • three such single conductor cables are preferably laid in a horizontal single-level arrangement, the ends of the metal sheds being connected to one another in each case.
  • shielding factors SF are the ratio of the magnetic induction (just above the surface of the earth) of the unshielded cable to the shielded cable.
  • FIGS. 3 to 6 Used for the high-permeability harness, overlapping wound thin strips of special steel. Their relative permeability should be around 10,000. The effect of this applied above the copper screen bands are the FIGS. 3 to 6 refer to:
  • the present design does not increase the conductor overhead losses due to field concentration within the magnetic sheath.
  • the shielding factors as a function of the screen cross section A S are plotted for the landing point at 0.2 m above the ground, directly above the horizontal cable system in a single plane arrangement, without and with a high permeability layer above the copper screen. Without magnetic harness, shielding factors of up to around 30 are achieved, depending on the screen cross-section. If, in addition, a highly permeable layer is applied above the copper screen, extremely high shielding factors result, which reach up to about 1400.
  • Fig. 7 the current carrying capacity is shown as a function of the wire spacing s of the cables in a single-level arrangement.
  • dashed line cables with crossed shields with screen cross section of 50 mm 2 strong line: single conductor cable according to the invention with screen cross section 2500 mm 2
  • Parameter magnetic field restriction (thin characteristic: without restriction)
  • the thin and the dashed characteristic show the current carrying capacity of the cable with a "normal" screen cross-section of 50 mm 2 with cyclic cross-bonding of the screens, as a function of the wire spacing of the cables in the horizontal single-level arrangement. While the thin characteristic does not take into account any magnetic field restriction, the thick dashed characteristic at distances of about s > 0.25 m shows the required current reduction in the event that a maximum magnetic induction of 100 ⁇ T is set at a height of 0.2 m above the earth's surface , A favorable thermal expansion distance of the cable in this case leads to a reduction of the maximum current.
  • the black dot in Fig. 7 returns the load capacity of this cable in the case of an extreme magnetic field restriction of 0.2 ⁇ T, assuming a tight laying of the cables in a steel pipe. In this case, not only the thermally unfavorable arrangement, but also the additional losses of the steel pipe in the order of 20% and the additional losses caused by the steel pipe in the cable have a decreasing load-bearing effect.
  • Fig. 7 shows the current-carrying capacity of the present single conductor cable, which depends on the wire spacing, here with a copper screen cross section of 2500 mm 2 .
  • Fig. 5b does this Cable even with large wire distances a maximum magnetic induction of less than 0.1 .mu.T, so that a case distinction with respect to the magnetic field restriction is unnecessary.

Landscapes

  • Insulated Conductors (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Cable Accessories (AREA)
EP20100005479 2009-06-06 2010-05-27 Hochspannungsdrehstromsystem Not-in-force EP2259271B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009024149A DE102009024149A1 (de) 2009-06-06 2009-06-06 Einadriges Drehstromkabel mit integrierter elektromagnetischer Schirmung
DE102010006352 2010-01-30

Publications (3)

Publication Number Publication Date
EP2259271A2 EP2259271A2 (de) 2010-12-08
EP2259271A3 EP2259271A3 (de) 2012-06-20
EP2259271B1 true EP2259271B1 (de) 2013-05-08

Family

ID=42342523

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20100005479 Not-in-force EP2259271B1 (de) 2009-06-06 2010-05-27 Hochspannungsdrehstromsystem

Country Status (3)

Country Link
EP (1) EP2259271B1 (es)
DK (1) DK2259271T3 (es)
ES (1) ES2421733T3 (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103531296A (zh) * 2013-10-03 2014-01-22 合肥市硕理机电科技有限公司 一种加固型多芯电缆

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19807527A1 (de) * 1998-02-21 1999-08-26 Cit Alcatel Elektrische Leitung oder elektrisches Kabel
BR0210714A (pt) 2001-06-29 2004-07-20 Pirelli & C Spa Método para blindar o campo magnético gerado por uma linha de transmissão de energia elétrica, linha de transmissão de energia elétrica, e, blindagem magnética de camada múltipla
CA2499799C (en) 2002-10-09 2009-12-15 Pirelli & C. S.P.A. Method of screening the magnetic field generated by an electrical power transmission line and electrical power transmission line so screened
ATE371288T1 (de) 2004-05-21 2007-09-15 Belgian Electricity Lines Engi Verfahren zum anordnen einer magnetischen abschirmung längs einer wechselstromenergieleitung
ES2329277T3 (es) * 2005-11-05 2009-11-24 Geo Gesellschaft Fur Energie Und Oekologie Mbh Sistema de transmision para la transmision de potencias altas con campo magnetico recluido.
DE102006013553B3 (de) 2006-03-24 2007-10-18 Nkt Cables Gmbh Anordnung zum Umhüllen von mindestens einer Kabelader eines elektrischen Kabels

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103531296A (zh) * 2013-10-03 2014-01-22 合肥市硕理机电科技有限公司 一种加固型多芯电缆

Also Published As

Publication number Publication date
EP2259271A2 (de) 2010-12-08
DK2259271T3 (da) 2013-08-12
EP2259271A3 (de) 2012-06-20
ES2421733T3 (es) 2013-09-05

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