EP1903583A1 - Traversée à forte intensité pour transformateur - Google Patents

Traversée à forte intensité pour transformateur Download PDF

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Publication number
EP1903583A1
EP1903583A1 EP06020049A EP06020049A EP1903583A1 EP 1903583 A1 EP1903583 A1 EP 1903583A1 EP 06020049 A EP06020049 A EP 06020049A EP 06020049 A EP06020049 A EP 06020049A EP 1903583 A1 EP1903583 A1 EP 1903583A1
Authority
EP
European Patent Office
Prior art keywords
conductors
conductor
sub
transformer
current transformer
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.)
Granted
Application number
EP06020049A
Other languages
German (de)
English (en)
Other versions
EP1903583B1 (fr
Inventor
Winfried Feuerstein
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to EP20060020049 priority Critical patent/EP1903583B1/fr
Priority to ES06020049.0T priority patent/ES2524451T3/es
Priority to CN2007101612749A priority patent/CN101162642B/zh
Publication of EP1903583A1 publication Critical patent/EP1903583A1/fr
Application granted granted Critical
Publication of EP1903583B1 publication Critical patent/EP1903583B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings
    • H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields

Definitions

  • the invention relates to a high-current transformer bushing with a fastening means for attachment to a power plant transformer, an electrical conductor for passing through a transformer boiler housing and a guided around the conductor electrical insulator.
  • An electrical supply line to a power plant transformer is a high-current supply line, which is designed for the passage of very high currents in conjunction with high voltages. For example, if a generator of a steam power plant supplies a power of 600 MW to 900 MW with an output voltage of 21 kV to 27 kV, the result is a current of 18 kA to 25 kA, for which the supply line to the transformer must be designed.
  • the skin effect describes the fact that an alternating current flowing through a conductor generates eddy currents in the interior of the conductor, which are directed counter to the generator current. Since the AC-induced magnetic field inside the conductor induces stronger eddy currents than at the edge, the counter-voltage generated thereby inside the conductor is greatest and weakens towards its edge. Due to the large reactance inside the conductor, the current flows essentially at the edge. For a copper conductor, the skin depth at which the current density has dropped below the factor 1 / e is about 9 mm at 50 Hz. Therefore, conduction areas that are below about 20 mm below the radially outer line surface, hardly contribute to the power line.
  • a power plant transformer known to perform the supply line as a tubular conductor whose wall thickness is a maximum of 20 mm.
  • a pipe conductor can have a diameter of up to 1 m.
  • the implementation of three such pipes for the three phases of a three-phase supply through the housing of the power plant transformer is complex in the voltage insulation and unfavorable in terms of space, which is why the implementation is built by the transformer housing with a slimmer pipe.
  • the resulting higher current density in the conductor and the associated higher heat development is at least partially compensated by more expensive conductor materials and a cooling of the conductor with transformer oil to the required maximum temperature of 90 ° C for the conductor, maximum to 115 ° C at hot spots.
  • the current to the transformer can be passed through both sub-conductors and a current density in each sub-conductor can be maintained so that heating of the sub-conductors remains to a desired extent.
  • the internal resistances of both sub-conductors are the same by appropriate measures, so that a uniform distribution of the total current takes place on both sub-conductors without a corresponding control.
  • the two sub-conductors are advantageously connected to one another at their ends, so that the total current can be supplied jointly to both sub-conductors and can be dissipated jointly by the two sub-conductors.
  • a uniform distribution of the current flowing through both sub-conductors total current can be particularly easily done when the two sub-conductors are arranged concentrically.
  • a radial current displacement through the skin effect can be distributed uniformly in the radial direction on both sub-conductors.
  • both sub-conductors along a current path by means of a radial cross-over both an inner portion within the other sub-conductor and an outer portion outside of the other sub-conductor.
  • Each arranged in the interior of the other sub-conductor sub-conductor has a higher internal resistance than the outer sub-conductor. Due to the fact that both sub-conductors run both inside and outside, this increased internal resistance is distributed over both sub-conductors, since both sub-conductors are provided with an inner path with increased resistance. This can be done in a simple manner, a uniform current distribution to both sub-conductors.
  • a current path is a path along a voltage gradient upon application of an operational voltage to the conductor.
  • the two sub-conductors are guided into each other over an axial distance, and the intersection is arranged in the middle of the axial distance.
  • the internal resistance of the two sub-conductors can be distributed particularly reliably and independently of operating conditions symmetrically and thus evenly. It is sufficient in this case if a region of the intersection is arranged in the middle of the axial distance.
  • the intersection is arranged outside the transformer housing.
  • a crossover of the sub-conductors can be associated with a reduction of the cross-section of the conductor and thus with an increased resistance and increased heat development.
  • the cooling oil is suitably transformer oil.
  • a crossover may be made by an array of interconnecting conductors connecting an inner portion to an outer portion of a subconductor. These connecting conductors may point in the radial direction or be guided at an angle to the axial direction X-shaped.
  • a simple production of a mechanically stable and compact intersection can be achieved if the intersection has S-shaped curved connecting conductors between an inner and an outer portion.
  • an axial distance between inner sections of the sub-conductors is smaller than an axial distance between outer sections of the sub-conductors. It can be made a cross-over in a small space, so that conductor lines with a small cross-section can be kept short and the resistance small.
  • a part conductor is passed through the other. This can be carried out particularly easily in the production, if a sub-conductor has tangential sections which terminate blind and where connecting conductors of the other sub-conductor can be passed. It is proposed in another embodiment that the intersection in the axial direction around each other rotated connecting conductor pairs between inner and outer sections. On the blind ending sections can - be dispensed with - except for small Isolierabrang between the connecting conductors - and a large continuous line cross section can be achieved.
  • connection conductors are easier to manufacture than wider connection conductors. To compensate for a current displacement in the connecting conductor this can be made thicker in its central region than at its axial ends.
  • the generator lead 2 comprises a tubular conductor 6 made of pure aluminum with a diameter of 0.92 m and a wall thickness of 20 mm, which is surrounded by a cladding tube 8 for encapsulation.
  • the conductor 6 terminates at a flange 10, which is connected via flexible copper bands 12 electrically connected to a transformer terminal 14.
  • the transformer terminal 14 is connected via a flange contact 16 with a high current transformer feedthrough 18, which is connected to a flange 20 of a transformer box 22 of the power plant transformer 4 and passed through this and the transformer boiler housing 22.
  • the cladding tube 8 comprises a flexible compensating piece 24, which, like the copper bands 12, is provided to compensate for oscillations between the power plant transformer 4 and the generator outlet 2.
  • the high-current transformer feedthrough 18 is shown in a longitudinal section. It comprises an outer insulator 26, designed as a porcelain tube with ripples 28 for rollover protection, and separating an electrical conductor 30 from the earthed flange terminal 20 of the boiler ceiling.
  • the conductor 30 begins at the top of the flange contact 16 and terminates within the transformer boiler housing 22 on a current carrying fastening means 32 designed as a double conductor flange for indirect attachment to the power station transformer 4.
  • the double conductor flange is connected by a screw connection to a busbar 34 of a switching line which electrically connects the conductor 30 a low-voltage winding of the power plant transformer 4 connects.
  • a lower insulating plate 36 seals an oil space 38 filled with transformer oil against the transformer interior, wherein the oil space 38 fills most of the interior of the insulator 26 and surrounds most of the conductor 30 and is sealed to the outside by a seal 40.
  • the conductor 30 comprises two mutually guided tubular sub-conductors 42, 44 made of copper, of which the sub-conductor 42 has an outer portion 46 and an inner portion 48 and the sub-conductor 44 has an inner portion 50 and an outer portion 52.
  • the sections 46 and 50 and the sections 48 and 52 are tubular and each arranged concentrically about a central axis 54 into each other.
  • the outer sections 46, 52 have a diameter of 340 mm and the inner sections 48, 50 a diameter of 280 mm, wherein the sections 46, 48, 50, 52 with a wall thickness of 16 mm and a radial distance between them of 14 mm are executed.
  • the sections 46, 48, 50, 52 are completely surrounded by the transformer oil serving as cooling oil in the oil chamber 38 and from its radial outer side, the sections 48, 50 are completely and the sections 46, 52 largely completely surrounded by transformer oil.
  • a plurality of openings 56 are respectively introduced into the sections 46, 48, 50, 52.
  • the transformer oil also flows around a radial intersection 58 of the sub-conductors 42, 44 which electrically connects the outer portion 46 to the inner portion 48 of the sub-conductor 42 and the inner portion 50 to the outer portion 52 of the sub-conductor 44.
  • the crossover 58 is disposed in the middle of an axial path 60 between the flange contact 16 and the flange of the fastener 32 so that the inner portions 48, 50 and the outer portions 46, 52 are at least substantially equal in dimension.
  • the intersection 58 is shown in FIGS. 3 and 4 in various cross sections.
  • Four connecting conductors 62 connect the outer portion 46 to the inner portion 48
  • four connecting conductors 64 connect the inner portion 50 to the outer portion 52 so that a current path along the conductor 30 is always through an outer portion 46, 52, a connecting conductor 62, 64th and an inner portion 48, 50 extends.
  • Between the connecting conductors 62, 64 is always a small tangential distance 66, which prevents a short circuit of the sub-conductors 42, 44.
  • connection conductors 62, 64 are provided with upper and lower axially guided segments 68, 70 for connection to each of the sections 46, 48, 50, 52 and to a radially aligned intermediate segment 72 for connecting the segments 68, 70 Connecting conductors 62, 64 are welded to the sections 46, 48, 50, 52, respectively.
  • the internal resistances or alternating current resistances of the outer sections 46, 52 caused by the skin effect are the same and the inner sections 48, 50 equal.
  • the same material and the same geometric dimensions of each of the outer portions 46, 52 and the inner portions 48, 50 and the ohmic resistances of the same sections 46, 48, 50, 52 and the connecting conductors 62, 64 are equal.
  • each of the sub-conductors 42, 44 has an outer portion 46, 52 and an inner portion 48, 50 and four connection conductors 62, 64, the total resistances of the sub-conductors 42, 44 are equal and they are in operation of the high-current transformer feedthrough 18 of electricity flowing through with the same current.
  • FIG 5 Another embodiment of a conductor 74 for a high current transformer feedthrough is shown in FIG 5 in a perspective view.
  • the following description is essentially limited to the differences from the exemplary embodiment in FIGS. 1 to 4, to which reference is made with regard to features and functions that remain the same.
  • Substantially identical components are basically numbered with the same reference numerals.
  • the conductor 74 is constructed analogously to the conductor 30.
  • the sections 46 and 48 and the sections 50 and 52, of which only the outer sections 46, 52 are visible in FIG. 5, are interconnected by connecting conductors 76, 78 which are each guided diagonally and together form an X-shaped crossover 80 form.
  • This embodiment is particularly easy to manufacture.
  • other crosses are also conceivable, such as by S-shaped or more generally: curved connection conductor.
  • FIG. 5 While the embodiment shown in FIG. 5 is simple to manufacture, the embodiment of FIGS. 2-4 permits an axially compact construction of the intersection 58, which allows an axial spacing 82 between inner sections 48, 50 of the sub-conductors 42, 44 is smaller than an axial distance 84 between outer portions 46, 52 of the sub-conductors 42, 44.
  • the distance 82 between the inner portions 48, 50 is only 70 mm and the distance 84 between the outer portions 46, 52 is 100 mm.
  • each four connecting conductors 62, 64, 76, 78 is only about 40% of the line cross section of the sections 46, 48, 50, 52. This results in the connecting conductors 62, 64, 76, 78, a slightly higher current density connected to a something Higher heat development than in the sections 46, 48, 50, 52.
  • the connecting conductors 62, 64, 76, 78 Due to the small line lengths of the connecting conductors 62, 64, 76, 78, this increased heat can be dissipated by the oil bath with transformer oil, the connecting conductors 62, 64, 76, 78th surrounds. For this purpose, the convection of the transformer oil favored by the openings 56 is advantageous.
  • FIG 6 An embodiment in which the generation of increased heat by a small cross-section of the conductor conductors 62, 64, 76, 78 is kept low, is shown in FIG 6 in a schematic side view.
  • the connecting conductors 90, 92 are at most three times as wide as a radial tube wall thickness of 16 mm of the sections 46, 48, 50, 52nd

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulators (AREA)
  • Transformers For Measuring Instruments (AREA)
EP20060020049 2006-09-25 2006-09-25 Traversée à forte intensité pour transformateur Active EP1903583B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP20060020049 EP1903583B1 (fr) 2006-09-25 2006-09-25 Traversée à forte intensité pour transformateur
ES06020049.0T ES2524451T3 (es) 2006-09-25 2006-09-25 Aislador pasante de transformador de alta corriente
CN2007101612749A CN101162642B (zh) 2006-09-25 2007-09-25 大电流变压器绝缘套管

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20060020049 EP1903583B1 (fr) 2006-09-25 2006-09-25 Traversée à forte intensité pour transformateur

Publications (2)

Publication Number Publication Date
EP1903583A1 true EP1903583A1 (fr) 2008-03-26
EP1903583B1 EP1903583B1 (fr) 2014-10-29

Family

ID=37807305

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060020049 Active EP1903583B1 (fr) 2006-09-25 2006-09-25 Traversée à forte intensité pour transformateur

Country Status (3)

Country Link
EP (1) EP1903583B1 (fr)
CN (1) CN101162642B (fr)
ES (1) ES2524451T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2922070A1 (fr) * 2014-03-19 2015-09-23 ABB Technology Ltd Système d'isolation électrique et dispositif à induction électromagnétique haute tension comprenant celui-ci
WO2017202558A1 (fr) * 2016-05-25 2017-11-30 Siemens Aktiengesellschaft Dispositif de liaison d'un conducteur haute tension à un bobinage d'un appareil électrique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2624259B8 (fr) * 2012-02-03 2019-09-11 ABB Schweiz AG Traversée pour un système d'alimentation et système comportant une telle traversée

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1047414A (fr) * 1900-01-01
GB443017A (en) * 1934-07-18 1936-02-18 Harold Smethurst Improvements in lead-in conductors for transformers, switchgear and like electrical apparatus enclosed in metal casings
US4132853A (en) 1977-04-25 1979-01-02 Westinghouse Electric Corp. Electrical bushing
US4594475A (en) * 1984-08-03 1986-06-10 Westinghouse Electric Corp. Electrical bushing having a convertible central conductor
EP1411619A1 (fr) 2002-10-16 2004-04-21 Siemens Aktiengesellschaft Raccordement de générateur, notamment ayant la zone de connexion dans la fondation du générateur

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2805040Y (zh) * 2005-05-27 2006-08-09 南京智达电气有限公司 大电流无局放变压器套管

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1047414A (fr) * 1900-01-01
GB443017A (en) * 1934-07-18 1936-02-18 Harold Smethurst Improvements in lead-in conductors for transformers, switchgear and like electrical apparatus enclosed in metal casings
US4132853A (en) 1977-04-25 1979-01-02 Westinghouse Electric Corp. Electrical bushing
US4594475A (en) * 1984-08-03 1986-06-10 Westinghouse Electric Corp. Electrical bushing having a convertible central conductor
EP1411619A1 (fr) 2002-10-16 2004-04-21 Siemens Aktiengesellschaft Raccordement de générateur, notamment ayant la zone de connexion dans la fondation du générateur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2922070A1 (fr) * 2014-03-19 2015-09-23 ABB Technology Ltd Système d'isolation électrique et dispositif à induction électromagnétique haute tension comprenant celui-ci
WO2017202558A1 (fr) * 2016-05-25 2017-11-30 Siemens Aktiengesellschaft Dispositif de liaison d'un conducteur haute tension à un bobinage d'un appareil électrique

Also Published As

Publication number Publication date
ES2524451T3 (es) 2014-12-09
CN101162642B (zh) 2012-11-28
CN101162642A (zh) 2008-04-16
EP1903583B1 (fr) 2014-10-29

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