EP2088603B1 - Réacteur à dérivation - Google Patents

Réacteur à dérivation Download PDF

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Publication number
EP2088603B1
EP2088603B1 EP09152300.1A EP09152300A EP2088603B1 EP 2088603 B1 EP2088603 B1 EP 2088603B1 EP 09152300 A EP09152300 A EP 09152300A EP 2088603 B1 EP2088603 B1 EP 2088603B1
Authority
EP
European Patent Office
Prior art keywords
phase
leg
flux return
air
gap
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.)
Active
Application number
EP09152300.1A
Other languages
German (de)
English (en)
Other versions
EP2088603A3 (fr
EP2088603A2 (fr
Inventor
Esa Virtanen
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.)
ABB Schweiz AG
Original Assignee
ABB Schweiz AG
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Publication date
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Publication of EP2088603A2 publication Critical patent/EP2088603A2/fr
Publication of EP2088603A3 publication Critical patent/EP2088603A3/fr
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Publication of EP2088603B1 publication Critical patent/EP2088603B1/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F3/12—Magnetic shunt paths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/08—Variable transformers or inductances not covered by group H01F21/00 with core, coil, winding, or shield movable to offset variation of voltage or phase shift, e.g. induction regulators
    • H01F29/10—Variable transformers or inductances not covered by group H01F21/00 with core, coil, winding, or shield movable to offset variation of voltage or phase shift, e.g. induction regulators having movable part of magnetic circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F3/14—Constrictions; Gaps, e.g. air-gaps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F37/00—Fixed inductances not covered by group H01F17/00

Definitions

  • the invention is related to three-phase iron-core type shunt reactors.
  • An iron core shunt reactor with an air-gap in each phase leg is one typical reactor type to be used for compensating the three-phase capacitive reactive power and reducing the earth fault current in electric power transmission or distribution networks.
  • a compact structure, light weight and low losses can be achieved by using this iron-core reactor type.
  • the zero impedance Z 0 typically is about 30% of the positive sequence impedance Z 1 , so in other words the ratio Z 0 : Z 1 ⁇ 0,3. Because the leakage flux is strongly heating the wall of the tank, the network shall be disconnected immediately in a case of earth fault.
  • the zero impedance Z 0 for those types is about equal to the positive sequence impedance Z 1 , so in other words the ratio Z 0 : Z 1 ⁇ 1.
  • the flux return leg is a path for the flux caused by the homopolar flux, enabling to continue running the power network in a case of earth fault. In some cases a problem is the potential overcompensation of the earth fault current.
  • GB 509,050 discloses a shunt reactor according to the preamble of present claim 1, with one leg for each phase and a return flux leg with a fixed air gap.
  • EP 0117460 A1 discloses a five leg shunt reactor with three yoke sections, having a fixed air gap between yoke sections and between a yoke section and a return leg.
  • JP 57112007 discloses a seven leg shunt reactor with three main legs and four feedback legs, one lower yoke and the upper yoke is split in three parts. There is a vacant space between each upper yoke part and the adjacent feedback leg.
  • the values of the ratio Z 0 : Z 1 between 0.3 and 1 might be needed to run the network during earth fault but still not overcompensating the network.
  • the object of the invention is to provide a shunt reactor such that the above-mentioned problem can be solved.
  • This is achieved by a three-phase shunt reactor according to any of independent claims 1.
  • the three-phase iron-core type shunt reactor has a four or a five leg core where all three phase legs are equipped with one or plurality of air-gaps but the flux return-leg or flux return-legs are equipped with at least one air-gap, as well.
  • the cross-sectional area of the flux return leg in a four leg arrangement is preferably the same as for the three phase legs. In a five leg arrangement, the cross-sectional area of the flux return legs could be half of that.
  • the air-gap should be about equal on both sides to ensure a linear functionality in function of earth fault current.
  • a leg consisting of an iron core with an air-gap could be formed by laminating a plurality of block iron cores having at least one pure air-gap or air-gap filled by a non-magnetic material.
  • An air-gap of the flux return leg is adjustable.
  • the flux return leg is equipped with an arrangement to move one part of the leg with reference to another part of the flux return leg to adjust the path for homopolar flux.
  • the ratio Z o : Z 1 could even be continuously adjusted by an automatic control arrangement.
  • a shunt reactor is typically directly earthed, but the range of ratio Z o : Z 1 could be expanded by connecting an additional one-phase zero-point coil, called a neutral earthing reactor between the star point of the shunt reactor windings and the earth.
  • the values for ratio Z o : Z 1 up to more than 1 could be achieved. If the reactor has no star point connection to the earth or is delta connected, the Z o has an infinite value.
  • Fig. 1 shows a three-phase shunt reactor according to an embodiment of the invention.
  • the core (1) of the reactor is typically oil-immersed in a tank (2).
  • the shunt reactor comprises an upper yoke (3) and a lower yoke (4), one phase leg (5) for each phase, a winding (6) wound surrounding each phase leg and a flux return leg (8).
  • Each phase leg is equipped with an air-gap (7).
  • the flux return leg (8) is equipped with at least one air-gap (11), as well.
  • the length of the air-gaps (7,10) could roughly be calculated by the common formulas for magnetic circuits having air and iron portions.
  • the flux return leg (8) should be constructed to carry the mechanical forces like what is commonly known from the designs of phase legs (5) for typical shunt reactor with air-gaps (7).
  • the air-gap (7, 10) could be filled by non-magnetic material to keep more easily the length fixed against to mechanical forces.
  • the first end of each winding (6) is connected to a bushing insulator (not shown) on the top of the tank (2).
  • Another ends of the windings could be internally star-coupled and the star-point connected to a bushing insulator or a particular earthing terminal to offer one connection point to the earth.
  • the another end of each winding could be connected to a corresponding bush insulator to be star-coupled outside of the tank.
  • Fig. 2 shows another embodiment of a three-phase shunt reactor with two flux return legs (8).
  • the cross-section area of the flux return legs could be half of that on phase legs.
  • the dimensions, like the length of the air-gap (10) of both flux return legs should be essentially equal to ensure linear functionality of the shunt reactor as a function of earth fault current.
  • Fig. 3 shows a principle main circuit drawing of the shunt reactor.
  • the first end of each winding (6) is connected to corresponding phase of the three phase transmission or distribution line by a circuit breaker or disconnector.
  • the shunt reactor could be connected to the substation bus bar, as well.
  • the second ends of each winding are star connected and the star connection point is directly connected to the earth.
  • Fig. 4 shows a principle main circuit drawing of another embodiment of the shunt reactor.
  • the first end of each winding is connected to corresponding phase of the three phase transmission or distribution line.
  • the second ends of the winding are star connected and the star connection point is connected by a one-phase zero-point coil (12) to the earth.
  • the zero-point coil (12) could be fixed or adjustable.
  • Fig. 5 shows an embodiment of a three-phase shunt reactor.
  • the flux return leg (8) is equipped with an arrangement to adjust the length of the air-gap (10).
  • the lower portion (10) of the flux return leg is fixed and magnetically connected to the lower yoke (4).
  • the upper portion (13) of the flux return leg is moveable arranged and magnetically connected to the upper yoke (3).
  • Fig. 6 shows another embodiment of a three-phase shunt reactor.
  • the flux return leg (8) is equipped with an arrangement to adjust the magnetic circuit.
  • a moveable portion (14) is arranged between the fixed upper portion (9) and the fixed lower portion (10) of the flux return leg.
  • the magnetic circuit through the return path is adjustable by moving the moveable portion (14) transversely related to the fixed portions (9,10).
  • the ratio Z o : Z 1 could be continuously adjusted from about 0,3 (open) to 1 (closed).

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Control Of Electrical Variables (AREA)

Claims (2)

  1. Réactance shunt triphasée pour réseaux de transport ou de répartition d'énergie électrique, la réactance shunt comprenant
    - un noyau de fer (1) comprenant une culasse supérieure (3), une culasse inférieure (4), une branche de phase (5) pour chaque phase, au moins un entrefer (7) pour chaque branche de phase et au moins une broche de retour de flux (8) qui comprend au moins un entrefer (11) pour ajuster la réluctance du chemin de retour de flux, ledit noyau de fer pouvant être agencé dans une cuve (2),
    - un enroulement (6) enroulé autour de chaque branche de phase, la première extrémité de chaque enroulement étant connectée à une phase correspondante et pouvant être connectée à une douille isolante et les secondes extrémités des enroulements étant agencées pour être couplées en étoile et mises à la masse directement ou par l'intermédiaire d'une bobine monophasée à point zéro (12), caractérisée en ce qu'au moins une partie (13) de la branche de retour de flux (8) est agencée pour être déplaçable de manière linéaire par rapport à une partie fixe (10) de la branche de retour de flux (8) pour ajuster la longueur de l'entrefer (11) pour faire en sorte que la réluctance du chemin de retour de flux soit continûment ajustable.
  2. Réactance shunt triphasée pour réseaux de transport ou de répartition d'énergie électrique, la réactance shunt comprenant
    - un noyau de fer (1) comprenant une culasse supérieure (3), une culasse inférieure (4), une branche de phase (5) pour chaque phase, au moins un entrefer (7) pour chaque branche de phase et au moins une branche de retour de flux (8) qui comprend au moins un entrefer (11) pour ajuster la réluctance du chemin de retour de flux, ledit noyau de fer pouvant être agencé dans une cuve (2),
    - un enroulement (6) enroulé autour de chaque branche de phase, la première extrémité de chaque enroulement étant connectée à une phase correspondante et pouvant être connectée à une douille isolante et les secondes extrémités des enroulements étant agencées pour être couplées en étoile et mises à la masse directement ou par l'intermédiaire d'une bobine monophasée à point zéro (12), caractérisée en ce qu'au moins une partie (14) de la branche de retour de flux est agencée pour être déplaçable de manière linéaire transversalement par rapport aux parties fixes (9, 10) de la branche de retour de flux (8) pour ajuster les superficies en coupe transversale opposées sur l'entrefer (11) pour faire en sorte que la réluctance du chemin de retour de flux soit continûment ajustable.
EP09152300.1A 2008-02-06 2009-02-06 Réacteur à dérivation Active EP2088603B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20080085A FI20080085L (fi) 2008-02-06 2008-02-06 Rinnakkaiskuristin

Publications (3)

Publication Number Publication Date
EP2088603A2 EP2088603A2 (fr) 2009-08-12
EP2088603A3 EP2088603A3 (fr) 2014-06-25
EP2088603B1 true EP2088603B1 (fr) 2017-10-25

Family

ID=39148865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09152300.1A Active EP2088603B1 (fr) 2008-02-06 2009-02-06 Réacteur à dérivation

Country Status (2)

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EP (1) EP2088603B1 (fr)
FI (1) FI20080085L (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103946934B (zh) * 2012-11-08 2016-01-06 三菱电机株式会社 噪声滤波器
CN104021921A (zh) * 2014-05-27 2014-09-03 华为技术有限公司 耦合电感和功率变换器
CN104282412B (zh) * 2014-10-28 2017-01-11 田村（中国）企业管理有限公司 磁集成电感器
CN104882253B (zh) * 2015-04-24 2017-12-29 上海意兰可电力电子设备有限公司 三相四柱共轭电抗器
DE102016107295A1 (de) 2016-04-20 2017-10-26 Wobben Properties Gmbh Drehstromdrosselspule
CN106057402B (zh) * 2016-08-09 2018-03-13 华为技术有限公司 磁集成电感及磁集成电路
US10930423B1 (en) * 2017-07-05 2021-02-23 Universal Lighting Technologies, Inc. Single magnetic assembly combining three independent magnetics using a modified “E” core with four winding windows
GB201811128D0 (en) 2018-07-06 2018-08-22 Rolls Royce Plc Current controlling device
CN109326420B (zh) * 2018-11-15 2023-12-26 山西中磁尚善科技有限公司 三相电抗器的电感平衡磁芯及三相电抗器
DE102021109474A1 (de) * 2021-04-15 2022-10-20 TenneT TSO GmbH Elektrische Spule, angeordnet in einem elektromagnetischen Wechselfeld zum Erzeugen von Eigenbedarfstrom

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB509050A (en) * 1937-12-10 1939-07-10 Gen Electric Co Ltd Improvements in and relating to electrical reactors
JPS57112007A (en) * 1980-12-29 1982-07-12 Fuji Electric Co Ltd Three-phase and seven-leg core type reactor
DE3305708A1 (de) * 1983-02-18 1984-08-23 Transformatoren Union Ag, 7000 Stuttgart Drehstromdrosselspule mit fuenfschenkelkern
JPH02203507A (ja) * 1989-02-01 1990-08-13 Fuji Electric Co Ltd 三相分路リアクトル鉄心

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
FI20080085L (fi) 2009-08-07
FI20080085A0 (fi) 2008-02-06
EP2088603A3 (fr) 2014-06-25
EP2088603A2 (fr) 2009-08-12

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