EP3005383B1 - Dispositif de réduction d'une composante continue du flux magnétique dans le noyau d'un transformateur - Google Patents
Dispositif de réduction d'une composante continue du flux magnétique dans le noyau d'un transformateur Download PDFInfo
- Publication number
- EP3005383B1 EP3005383B1 EP13726491.7A EP13726491A EP3005383B1 EP 3005383 B1 EP3005383 B1 EP 3005383B1 EP 13726491 A EP13726491 A EP 13726491A EP 3005383 B1 EP3005383 B1 EP 3005383B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- transformer
- compensation
- windings
- core
- current source
- 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.)
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- 230000004907 flux Effects 0.000 title claims description 8
- 238000004804 winding Methods 0.000 claims description 60
- 230000007935 neutral effect Effects 0.000 claims description 29
- 239000003990 capacitor Substances 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 230000005415 magnetization Effects 0.000 description 4
- 230000005284 excitation Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
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
- H01F27/28—Coils; Windings; Conductive connections
-
- 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
- H01F27/38—Auxiliary core members; Auxiliary coils or windings
-
- 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
- H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
Definitions
- the invention relates to a device for reducing a magnetic DC component in the core of a transformer, in particular a three-phase transformer, comprising a plurality of compensation windings, which are magnetically coupled to the core of the transformer.
- the field of application is basically both in transformers in the low or medium voltage range, as well as in transformers of very high power (power transformers, HVDC (high voltage DC transmission) transformers).
- HVDC high voltage DC transmission
- DC supply hereinafter also referred to as DC component
- DC component may for example come from electronic components, such as those used today in the control of electrical drives or in the reactive power compensation.
- GIC Geomagnetically Induced Currents
- Geomagnetically induced currents occur approximately in ten-year cycles. They are evenly distributed over all (three) phases, can reach up to 30 A per phase and flow through the neutral point of a transformer. This leads to a strong saturation of the core of the transformer in a half cycle and therefore to a strong excitation current in a half cycle. This additional excitation has a strong harmonic content and thus caused by the stray field with harmonic content eddy current losses in windings and iron parts of the transformer.
- a voltage induced in a compensation winding is used and used for the compensation of the disturbing magnetic DC component by a thyristor switch is connected in series with a current limiting reactor to introduce the compensation current in the compensation winding.
- This solution works well for DC currents to be compensated within a range which are smaller by an order of magnitude than geomagnetically induced currents, ie in the range below 10 A.
- geomagnetically induced currents one would have to go to the medium voltage level, ie in the range of approximately 5 kV, and use powerful thyristors. Due to the high power dissipation of such thyristors, this solution is not economical.
- WO 2012/041367 A1 discloses an arrangement for reducing a DC field component in the core of a transformer, comprising a compensation winding magnetically coupled to the core of the transformer and a DC generator arranged in series with the compensation winding and with a reactance dipole, the reactance dipole comprising a parallel connection of an inductor and a capacitor is formed to feed into the compensation winding a compensation current whose effect is directed to the DC field component in the core opposite, wherein the inductance is formed of a first winding which is magnetically coupled to a second winding, the first winding with its one end connected to the DC generator and the other end connected to the compensation winding, and the second winding connected in parallel with the capacitor.
- the principle of the solution according to the invention is again based on the DC compensation by means of compensation windings, in that targeted current is fed into the compensation windings, the effect of which is directed counter to the DC component and prevents the magnetization of the core of the transformer.
- so-called Jacobamperewindungen be introduced into the transformer, ampere-turn is another term for the magnetic flux.
- the compensation current is introduced by a controllable current source in the compensation windings, wherein a compensation winding is usually provided per phase of the transformer.
- the problem of the voltages induced in the compensation windings must be solved.
- a known star point generator which is also referred to as zero point or grounding transformer.
- the neutral point generator generates a star point with respect to the outer conductor voltages of the compensation windings.
- the star point of the compensation windings and the star point formed by the neutral point generator are at the same potential.
- the star point generator has the advantage that direct currents that are introduced via its neutral point and then distribute evenly on all (three) of its legs, cause no magnetization of the core of the neutral point.
- An embodiment of the invention provides that at least one current limiting inductor is arranged electrically in series with the current source. This pre-switching of a current limiting choke can effectively filter out transient voltages so that they do not break through to the power source.
- the controllable current source is connected to a measuring device for detecting the magnetic DC component in the transformer.
- a measuring device for detecting the magnetic DC component in the transformer are approximately from the WO 2012/041368 A1 in the form of a magnetic shunt part with a sensor coil.
- the shunt portion may be disposed adjacent the core of the transformer, for example, on a leg or yoke to bypass a portion of the magnetic flux. From this, guided in the shunt magnetic flux can be obtained by means of a sensor coil very easily a long-term stable sensor signal, which optionally after a signal processing the DC component (CD component) maps very well.
- the star point former may comprise zigzag windings for better load distribution.
- direct current is deliberately introduced into a compensation winding K in order to eliminate the DC magnetization of the transformer core.
- the alternating voltage induced in the compensation winding K is utilized; the compensation winding K acts like an AC voltage source.
- the compensation winding K designed as a thyristor switching unit T is connected in series with a current limiting inductor L.
- the required direct current can be adjusted by voltage synchronous ignition at a specific ignition timing of the thyristor T.
- Ignition of the thyristor in the voltage zero crossing so sets the maximum direct current, which is superimposed with an alternating current of the amplitude of the direct current and the mains frequency. If the thyristor T is ignited later, the direct current becomes smaller, but also harmonic alternating currents occur.
- the current flow in the thyristor T is limited by a current limiting inductor L, dimensioning for the current limiting is the permissible thermal load of the thyristor T.
- the controllable current source S is electrically connected directly in series with the compensation windings K1, K2, K3, namely, the inputs of the compensation windings K1, K2, K3 are interconnected in a neutral point P1, which is directly connected to the power source S.
- a compensation winding K1, K2, K3 is arranged on a leg of a - not shown here - three-phase transformer.
- the three (here upper) primary windings with their one terminal end are each connected to an output of a compensation winding K1, K2, K3.
- the other terminal ends are each connected to a terminal end of the three (here lower) secondary windings in zigzag connection.
- the other terminal ends of the secondary winding are combined together in an artificial star point P2, which is connected directly to the controllable current source S.
- Zigzag switching means that the primary and secondary windings of one phase (here a compensation winding) are arranged on different legs of the neutral point former H or that the windings on the same leg belong to different phases (different compensation windings).
- Primary and secondary windings of the neutral point H are the same size, so have about the same number of turns, but are traversed in different directions by the stream. Thus, no flux is induced in the core of the neutral point H at the same current in different windings.
- the current source S is electrically connected on the one hand directly to the neutral point P1 of the compensation windings K1, K2, K3 and on the other hand to the star point P2 of the neutral point generator H.
- a current limiting inductor L may be arranged electrically in series with the current source S.
- the controllable current source is at ground potential. You can go with the medium voltage level to 10 kV, 20 kV or 30 kV. This reduces the DC compensation current and you can work with commercial power sources.
- the star point generator is very insensitive to star point DC currents, as they divide evenly and cause no additional nuclear magnetization.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Ac-Ac Conversion (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Soft Magnetic Materials (AREA)
- Inverter Devices (AREA)
Claims (5)
- Dispositif de réduction d'une composante continue de flux magnétique dans le noyau d'un transformateur, notamment d'un transformateur triphasé, comprenant une source de courant (S) commandable, une réactance de mise à la terre (H) et plusieurs enroulements de compensation (K1, K2, K3) qui peuvent être couplés magnétiquement au noyau du transformateur, dans lequel- la source de courant (S) commandable servant à alimenter en courant les enroulements de compensation (K1, K2, K3) est agencée électriquement en série avec les enroulements de compensation (K1, K2, K3), par le biais de leur point neutre (P1) qui est formé par les entrées des enroulements de compensation (K1, K2, K3), et- la réactance de mise à la terre (H) est reliée de manière électriquement conductrice aux sorties des enroulements de compensation (K1, K2, K3), et- la source de courant (S) relie électriquement le point neutre (P1) des enroulements de compensation (K1, K2, K3) au point neutre (P2) de la réactance de mise à la terre (H) .
- Dispositif selon la revendication 1, caractérisé en ce qu'au moins une inductance de limitation de courant (L) est agencée électriquement en série avec la source de courant (S).
- Dispositif selon l'une des revendications 1 ou 2, caractérisé en ce que le dispositif comprend un moyen de mesure pour détecter la composante continue du flux magnétique, qui est relié à la source de courant commandable (S).
- Dispositif selon l'une des revendications 1 à 3, caractérisé en ce qu'un enroulement de compensation (K1, K2, K3) est prévu par phase du transformateur.
- Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que la réactance de mise à la terre (H) comprend des enroulements montés en zigzag.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2013/060948 WO2014191023A1 (fr) | 2013-05-28 | 2013-05-28 | Dispositif de réduction d'une composante continue du flux magnétique dans le noyau d'un transformateur |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3005383A1 EP3005383A1 (fr) | 2016-04-13 |
EP3005383B1 true EP3005383B1 (fr) | 2019-10-09 |
Family
ID=48570112
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13726491.7A Active EP3005383B1 (fr) | 2013-05-28 | 2013-05-28 | Dispositif de réduction d'une composante continue du flux magnétique dans le noyau d'un transformateur |
Country Status (7)
Country | Link |
---|---|
US (1) | US10083789B2 (fr) |
EP (1) | EP3005383B1 (fr) |
KR (1) | KR101806293B1 (fr) |
CN (1) | CN105229759B (fr) |
BR (1) | BR112015029477B8 (fr) |
CA (1) | CA2910674C (fr) |
WO (1) | WO2014191023A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3179492B1 (fr) * | 2015-12-09 | 2018-08-29 | Siemens Aktiengesellschaft | Dispositif de protection pour un transformateur contre des courants induits géomagnétiquement |
CN115389807B (zh) * | 2022-10-27 | 2023-03-24 | 国网江西省电力有限公司电力科学研究院 | 一种基于磁通门的变压器中性点直流电流传感器 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2050082A (en) * | 1935-12-12 | 1936-08-04 | Gen Electric | Suppression of ground faults on alternating current systems |
GB1545491A (en) | 1975-05-13 | 1979-05-10 | Ass Elect Ind | Voltage stabilising saturated reactor arrangements |
JPS5913313A (ja) * | 1982-07-13 | 1984-01-24 | Mitsubishi Electric Corp | 変圧器の直流偏磁矯正方法 |
JPH0640696B2 (ja) * | 1987-09-22 | 1994-05-25 | 三菱電機株式会社 | 変圧器の直流偏磁検出方法 |
JP3662067B2 (ja) | 1996-04-24 | 2005-06-22 | ティーエム・ティーアンドディー株式会社 | 内鉄形単巻単相変圧器 |
SE527406C2 (sv) * | 2004-05-10 | 2006-02-28 | Forskarpatent I Syd Ab | Förfarande och DC-avledare för skydd av kraftsystem mot geomagnetiskt inducerade strömmar |
US7629786B2 (en) * | 2004-08-25 | 2009-12-08 | Sung Ho Lee | Device for reducing harmonics in three-phase poly-wire power lines |
KR100685289B1 (ko) | 2004-08-25 | 2007-02-22 | 이성호 | 삼상 다선식 전력라인의 고조파 저감장치 |
EP2156448B1 (fr) | 2007-06-12 | 2017-08-16 | Siemens Aktiengesellschaft | Transformateur électrique avec compensation du flux continu |
US9046901B2 (en) | 2010-09-29 | 2015-06-02 | Siemens Aktiengesellschaft | Device and method for reducing a magnetic unidirectional flux fraction in the core of a transformer |
US9183980B2 (en) * | 2010-09-29 | 2015-11-10 | Siemens Aktiengesellschaft | Arrangement and method for the compensation of a magnetic unidirectional flux in a transformer core |
CN202008919U (zh) * | 2011-03-18 | 2011-10-12 | 杭州得诚电力科技有限公司 | 用于低压配电网的曲折变压器 |
CN102364637A (zh) * | 2011-10-25 | 2012-02-29 | 中国西电电气股份有限公司 | 一种单相四柱铁心结构的电力变压器的补偿绕组体系 |
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2013
- 2013-05-28 BR BR112015029477A patent/BR112015029477B8/pt active IP Right Grant
- 2013-05-28 US US14/890,383 patent/US10083789B2/en active Active
- 2013-05-28 KR KR1020157036639A patent/KR101806293B1/ko active IP Right Grant
- 2013-05-28 WO PCT/EP2013/060948 patent/WO2014191023A1/fr active Application Filing
- 2013-05-28 CA CA2910674A patent/CA2910674C/fr active Active
- 2013-05-28 CN CN201380076964.8A patent/CN105229759B/zh active Active
- 2013-05-28 EP EP13726491.7A patent/EP3005383B1/fr active Active
Non-Patent Citations (1)
Title |
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Also Published As
Publication number | Publication date |
---|---|
US20160125999A1 (en) | 2016-05-05 |
CN105229759B (zh) | 2017-06-30 |
BR112015029477A2 (pt) | 2017-07-25 |
CA2910674C (fr) | 2018-03-13 |
US10083789B2 (en) | 2018-09-25 |
KR101806293B1 (ko) | 2017-12-07 |
EP3005383A1 (fr) | 2016-04-13 |
BR112015029477B1 (pt) | 2021-06-29 |
CN105229759A (zh) | 2016-01-06 |
CA2910674A1 (fr) | 2014-12-04 |
WO2014191023A1 (fr) | 2014-12-04 |
BR112015029477B8 (pt) | 2023-04-25 |
KR20160012223A (ko) | 2016-02-02 |
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