EP3336650B1 - Dispositif de réglage de tension longitudinale - Google Patents

Dispositif de réglage de tension longitudinale Download PDF

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Publication number
EP3336650B1
EP3336650B1 EP16204981.1A EP16204981A EP3336650B1 EP 3336650 B1 EP3336650 B1 EP 3336650B1 EP 16204981 A EP16204981 A EP 16204981A EP 3336650 B1 EP3336650 B1 EP 3336650B1
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EP
European Patent Office
Prior art keywords
voltage
transformer
voltage regulator
input
connection
Prior art date
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Active
Application number
EP16204981.1A
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German (de)
English (en)
Other versions
EP3336650A1 (fr
Inventor
Frank Cornelius
Martin Carlen
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.)
Hitachi Energy Ltd
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Hitachi Energy Switzerland 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
Priority to ES16204981T priority Critical patent/ES2941248T3/es
Application filed by Hitachi Energy Switzerland AG filed Critical Hitachi Energy Switzerland AG
Priority to DK16204981.1T priority patent/DK3336650T3/da
Priority to EP16204981.1A priority patent/EP3336650B1/fr
Priority to PL16204981.1T priority patent/PL3336650T3/pl
Priority to CN201780078797.9A priority patent/CN110073306B/zh
Priority to KR1020197016353A priority patent/KR102372114B1/ko
Priority to PCT/EP2017/083141 priority patent/WO2018114714A1/fr
Publication of EP3336650A1 publication Critical patent/EP3336650A1/fr
Priority to US16/442,577 priority patent/US10866604B2/en
Application granted granted Critical
Publication of EP3336650B1 publication Critical patent/EP3336650B1/fr
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Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
    • G05F1/24—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using bucking or boosting transformers as final control devices
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
    • G05F1/14—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using tap transformers or tap changing inductors as final control devices

Definitions

  • the invention relates to a direct-axis voltage regulator, in particular for use in a single-phase or multi-phase power distribution network, for example a medium-voltage network or a low-voltage network, according to the preamble of patent claim 1.
  • the CN 2 814 480 Y discloses a longitudinal voltage regulator of this type EP 0 637 122 A1 shows a method for controlling an output voltage in response to an input voltage.
  • the US 5,568,398A discloses a voltage regulator with a memory unit and the EP 2 390 750 A1 shows a voltage regulator and a toroidal transformer.
  • renewable energies include energies generated by means of photovoltaic systems or by means of other alternative energy sources. There are regions in which the amount of energy generated is significantly greater than the energy demand, so that excess energy has to be fed into the existing energy grid and transmitted over comparatively long distances to places where the energy demand is greater than the amount of energy generated there.
  • the European standard EN 50160 defines the requirements for the voltage in distribution grids and stipulates, among other things, that the voltage must remain within +/-10% of the nominal voltage.
  • HV-MV transformer which converts a supplied high voltage into a medium voltage. This voltage regulation can ensure that the voltage arriving at connected consumers is in the range of +/- 10% of the nominal voltage.
  • a direct-axis voltage regulator is used in the area of the supply lines of the medium-voltage network between the mentioned HV-MV transformer and the connected consumers, then this can achieve better stabilization of the voltage in the area of the supply lines and also the possibility of feeding in energy provided by means of alternative energy sources in the supply lines of the medium-voltage network can be improved.
  • the optimal positioning of a direct-axis voltage regulator depends on the particular medium-voltage network present and on the feed-in points for the energy, which is supplied in particular by large photovoltaic systems or other alternative energy sources.
  • a longitudinal voltage regulator is usually installed in a housing that is suitable for outdoor installation, for example in a concrete housing, and because of its dimensions and weight it has to be transported to the desired place of use by means of a low-loader. If a repositioning of the longitudinal voltage regulator in the area of the medium-voltage grid is necessary or if additional longitudinal voltage regulators are to be used in the medium-voltage grid, then this is associated with a comparatively high level of effort, since this in turn requires low-loaders that transport the respective longitudinal voltage regulator to the desired location. There it is then placed on a prepared concrete platform using a crane.
  • Such a series voltage regulator has a much more compact structure than known series voltage regulators, since it has only one transformer, which is designed to generate the additional voltage and to couple this additional voltage into the supply line.
  • This more compact structure enables the direct-axis voltage regulator to be reduced in size and weight.
  • This reduction in the weight and dimensions of the series voltage regulator also reduces the dimensions and weight of the housing in which the series voltage regulator is installed. This improves the portability of the longitudinal voltage regulator.
  • Such a longitudinal voltage regulator can be moved to the desired installation site, for example can also be transported on the loading area of a truck, which is associated with considerably less effort than transporting a longitudinal voltage regulator using a low-loader.
  • the housing of the longitudinal voltage regulator including the built-in longitudinal voltage regulator, is placed on a prepared foundation using a crane.
  • Further advantages of a longitudinal voltage regulator according to the invention are that its acquisition costs are lower than the acquisition costs of known longitudinal voltage regulators and that its energy efficiency is significantly increased.
  • the polarity of the additional voltage can preferably be changed. As a result, the desired voltage regulation can take place both positively and negatively.
  • the input voltage is superimposed in phase with the additional voltage, so that the additional voltage is added to the input voltage.
  • the input voltage is superimposed in phase opposition with the additional voltage, so that the additional voltage is subtracted from the input voltage.
  • the polarity of the additional voltage can advantageously be changed by changing the direction of the current.
  • one terminal of the input winding of the transformer can be connected to a reference potential and the other terminal of the input winding can be connected to an output terminal of the series voltage regulator, and one terminal of the output winding of the transformer can be connected to an input terminal of the series voltage regulator and the other terminal of the output winding can be connected to the output terminal of the series voltage regulator.
  • the additional voltage is superimposed in phase with the input voltage.
  • the input winding of the transformer can have a plurality of taps which are connected to the output terminals of a tap changer, the input terminal of the tap changer being connected to a reference potential. This allows a gradual change in the additional voltage provided. This possibility of switching on the additional voltage in stages allows the additional voltage to be adapted to the fluctuation range of the input voltage supplied.
  • the input winding of the transformer can also be designed without tapping according to an example in which no tap changer is used.
  • the figure 1 shows a sketch to explain the basic structure of a direct-axis voltage regulator described above.
  • This longitudinal voltage regulator 1 is used in a supply line 3 of a medium-voltage network, which is provided, for example, between a high-voltage-medium-voltage transformer (HV-MV transformer, not shown) and a low-voltage network, also not shown, in which loads are arranged.
  • An input voltage or system voltage U L subject to voltage fluctuations is present at the input connection 2 of the longitudinal voltage regulator 1 .
  • a regulated output voltage or a regulated system voltage U R is provided at the output connection 4 of the longitudinal voltage regulator 1 .
  • u R u L ⁇ u B .
  • variable voltage source 6 which is referred to below as the supply transformer.
  • the supply transformer This is in the figure 2 illustrated.
  • an input or system voltage U L that is subject to fluctuations is present at the input connection 2 of the booster transformer 5 on a supply line 3 .
  • a regulated output voltage or a regulated system voltage U R is provided at the output connection 4 of the longitudinal voltage regulator 1 .
  • u R u L ⁇ u B .
  • the longitudinal voltage regulator 1 has a variable voltage source 6 and a booster transformer 5 .
  • An additional voltage U RB drops across the input winding 5a of the booster transformer 5, which is connected to the variable voltage source 6. This is coupled by means of the booster transformer 5 into the secondary winding 5b of the booster transformer 5, which is inserted into the supply line 3 and across which a voltage U B drops, which is the additional voltage U RB coupled to the secondary side of the booster transformer 5 acts.
  • the variable voltage source 6 of the direct-axis voltage regulator 1 is formed by a supply transformer 7 .
  • This has a primary winding 7a and a secondary winding 7b.
  • the primary winding 7a of the supply transformer 7 is connected to the supply line 3 with one of its terminals.
  • the other terminal of the primary winding 7a is connected to a reference potential N.
  • the secondary winding 7b of the supply transformer 7 is connected to one connection of the primary winding 5a of the booster transformer 5 and with its second connection to the other connection of the primary winding 5a of the booster transformer 5 tied together.
  • This second connection of the secondary winding 7b of the supply transformer interacts with an uninterruptible tap changer 8 with five connections in such a way that the tapping point used on the secondary winding 7b can be switched over without interruption.
  • the figure 3 shows a sketch of a longitudinal voltage regulator 1 according to a first embodiment of the invention.
  • this longitudinal voltage regulator are compared to that in the figure 2 shown longitudinal voltage regulator reduces the dimensions and weight.
  • This longitudinal voltage regulator 1 can be used in a supply line 3 of a medium-voltage network, which is provided, for example, between a high-voltage-medium-voltage transformer (HV-MV transformer, not shown) and a low-voltage network, also not shown, in which loads are arranged.
  • An input voltage subject to voltage fluctuations or the system voltage U L subject to fluctuations is present at the input connection 2 of the longitudinal voltage regulator 1 .
  • a regulated output voltage or a regulated system voltage U R is provided at the output connection 4 of the longitudinal voltage regulator 1 .
  • u R u L ⁇ u B .
  • the direct-axis voltage regulator 1 has a variable voltage source 6 which is formed by the booster transformer 5 already mentioned, which interacts with a tap changer 8 .
  • the voltage source 6, which is supplied with energy from the supply line 3, is a variable voltage source, by means of which an additional voltage U RB is generated, which is applied to the input winding 5a of the booster transformer 5 and is coupled into the supply line 3 or boosted by means of the booster transformer 5 .is transformed into the supply line 3.
  • one connection of the input winding 5a of the booster transformer 5 is connected to the reference potential N via the tap changer 8 and the other connection of the input winding 5a of the booster transformer 5 is connected to an output connection 4 of the longitudinal voltage regulator 1.
  • one connection of the output winding 5b of the booster transformer 5 is connected to an input connection 2 of the series voltage regulator 1 and the other connection of the output winding 5b is connected to the output connection 4 of the series voltage regulator 1 .
  • the additional voltage U B coupled into the supply line 3 or transformed into the supply line 3 drops across the output winding 5b of the booster transformer 5 .
  • the variable voltage source 6 of the longitudinal voltage regulator 1 is formed by the primary winding 5a of the booster transformer 5, which interacts with the tap changer 8.
  • the primary winding 5a has five taps which are connected to output terminals of the tap changer 8 .
  • the input of the tap changer 8 is connected to the reference potential N.
  • the tap changer 8 can be switched in such a way that one of its total of 5 output connections is connected to the output connection 4 via the turns of the primary winding 5a remaining between the reference potential N and the output connection 4 .
  • the additional voltage generated by means of the variable voltage source can be changed by switching over the tap changer 8, for example by 2% from tap to tap of the primary winding 5a.
  • the taps of the primary winding 5a of the booster transformer 5 and the associated output connections of the tap changer 8 are distributed non-linearly over the number of turns of the primary winding 5a in such a way that a change in the selection of the tap used from tap to tap results in a linear change the provided additional voltage U RB allows.
  • This possibility of changing the additional voltage advantageously allows the additional voltage to be adapted to the voltage fluctuations occurring on the supply line 3 .
  • the figure 4 shows a sketch of a longitudinal voltage regulator 1 according to a second embodiment of the invention. Also with this longitudinal voltage regulator are compared to that in the figure 2 shown longitudinal voltage regulator reduces the dimensions and weight.
  • the direct-axis voltage regulator 1 has a variable voltage source 6 which is formed by the booster transformer 5 already mentioned, which interacts with a tap changer 8 .
  • the voltage source 6, which is supplied with energy from the supply line 3, is a variable voltage source, by means of which an additional voltage U RB is generated, which is present at the input winding 5a of the booster transformer 5 and is coupled into the supply line 3 or boosted by means of the booster transformer 5. is transformed into the supply line 3.
  • the booster transformer 5 is consequently designed in such a way that it both generates the additional voltage and couples it into the supply line 3 .
  • one connection of the input winding 5a of the booster transformer 5 is connected to the reference potential N via the tap changer 8 and the other connection of the input winding 5a of the booster transformer 5 is connected to the input connection 2 of the longitudinal voltage regulator 1.
  • one connection of the output winding 5b of the booster transformer 5 is connected to the input connection 2 of the series voltage regulator 1 and the other connection of the output winding 5b is connected to the output connection 4 of the series voltage regulator 1 .
  • the additional voltage U B coupled into the supply line 3 or transformed into the supply line 3 drops across the output winding 5b of the booster transformer 5 .
  • a major advantage of a direct-axis voltage regulator according to the invention is that it requires only one transformer. This is designed both to generate the additional voltage and to couple this additional voltage into the supply line. This enables a more compact structure compared to known direct-axis voltage regulators. This more compact structure in turn is accompanied by a reduction in the dimensions of the direct-axis voltage regulator and a reduction in its weight. This reduction in the weight and dimensions of the series voltage regulator also reduces the dimensions and weight of the housing in which the series voltage regulator is installed.
  • a concrete housing with built-in longitudinal voltage regulator according to the prior art has a length of 2.50 m, a width of 6.00 m and a height of 3.20 m Height a reduced width, which is for example 4.00 m.
  • a longitudinal voltage regulator built into a housing Due to the mentioned reduction in its weight and dimensions, the transportability of a longitudinal voltage regulator built into a housing is improved.
  • a longitudinal voltage regulator can be transported to the desired installation site, for example on the loading area of a truck, which is associated with considerably less effort than transporting a longitudinal voltage regulator using a low-loader, as was necessary with known longitudinal voltage regulators.
  • the housing of the longitudinal voltage regulator including the built-in longitudinal voltage regulator, is placed on a prepared foundation using a crane.
  • the improved portability of a direct-axis voltage regulator is particularly advantageous when additional energy sources, in particular alternative energy sources, are to be connected to the electricity distribution network when there is a need to expand an electricity distribution network. This often means that no longer tolerable voltage fluctuations occur in the area of the supply lines, which must be reduced by suitable voltage regulation. For such a voltage regulation, it is possible to place one or more longitudinal voltage regulators, which have the features according to the invention, at suitable positions within the power distribution network.
  • a series voltage regulator according to the invention is that its acquisition costs are lower than the acquisition costs of known series voltage regulators, since it has fewer components than conventional series voltage regulators.
  • the costs for the supply transformer used in conventional series voltage regulators are saved, which is used in known series voltage regulators in addition to the booster transformer.
  • a series voltage regulator according to the invention generates less waste heat than a known series voltage regulator because it requires fewer transformers and therefore has fewer losses.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Electrical Variables (AREA)
  • Lubricants (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Claims (5)

  1. Régulateur de composante longitudinale de tension (1), comprenant :
    - une borne d'entrée (2), qui est reliée à une ligne d'alimentation (3), la ligne d'alimentation (3) pouvant être reliée à une tension d'entrée (UL),
    - une borne de sortie (4), laquelle est configurée pour fournir une tension de sortie régulée (UR),
    - une source de tension (6),
    - un transformateur (5) destiné à générer une tension supplémentaire (URB) et pour injecter la tension supplémentaire (URB) dans la tension d'entrée, et
    - un commutateur à gradins (8),
    le transformateur (5) possédant un enroulement d'entrée (5a) et un enroulement de sortie (5b),
    l'enroulement de sortie (5b) étant disposé dans la ligne d'alimentation (3),
    une borne de l'enroulement de sortie (5b) du transformateur (5) étant reliée à la borne d'entrée (2) du régulateur de composante longitudinale de tension (1) et l'autre borne de l'enroulement de sortie (5b) à la borne de sortie (4) du régulateur de composante longitudinale de tension (1),
    l'enroulement d'entrée (5a) du transformateur (5) possédant plusieurs prises, qui sont reliées à des bornes de sortie du commutateur à gradins (8),
    la source de tension (6) étant formée par l'enroulement d'entrée (5a) du transformateur (5), qui est configuré pour coopérer avec le commutateur à gradins (8) afin de générer la tension supplémentaire (URB),
    une borne d'entrée du commutateur à gradins (8) étant reliée à un potentiel de référence (N),
    une borne de l'enroulement d'entrée (5a) du transformateur (5) étant reliée par le biais du commutateur à gradins (8) au potentiel de référence (N) et l'autre borne de l'enroulement d'entrée (5a) à la borne de sortie (4) du régulateur de composante longitudinale de tension (1),
    ou une borne de l'enroulement d'entrée (5a) du transformateur (5) étant reliée par le biais du commutateur à gradins (8) au potentiel de référence (N) et l'autre borne de l'enroulement d'entrée (5a) à la borne d'entrée (2) du régulateur de composante longitudinale de tension (1),
    caractérisé en ce que les positions des prises sont distribuées de manière non linéaire sur le nombre des spires de l'enroulement d'entrée (5a) du transformateur (5) de telle sorte qu'une modification de la sélection d'une prise permet une modification linéaire de la tension supplémentaire (URB).
  2. Régulateur de composante longitudinale de tension selon la revendication 1, la polarité de la tension supplémentaire étant modifiable.
  3. Régulateur de composante longitudinale de tension selon la revendication 2, la polarité de la tension supplémentaire étant modifiable par une modification du sens du courant.
  4. Régulateur de composante longitudinale de tension selon l'une des revendications précédentes, le nombre de prises de l'enroulement d'entrée (5a) du transformateur (5) étant de cinq.
  5. Utilisation d'un régulateur de composante longitudinale de tension ayant les caractéristiques indiquées dans l'une des revendications précédentes dans un réseau de distribution électrique mono- ou multiphasé.
EP16204981.1A 2016-12-19 2016-12-19 Dispositif de réglage de tension longitudinale Active EP3336650B1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
DK16204981.1T DK3336650T3 (da) 2016-12-19 2016-12-19 Langsgående spændingsregulator
EP16204981.1A EP3336650B1 (fr) 2016-12-19 2016-12-19 Dispositif de réglage de tension longitudinale
PL16204981.1T PL3336650T3 (pl) 2016-12-19 2016-12-19 Regulator do wzdłużnej regulacji napięcia
ES16204981T ES2941248T3 (es) 2016-12-19 2016-12-19 Regulador de tensión longitudinal
CN201780078797.9A CN110073306B (zh) 2016-12-19 2017-12-15 纵向电压调节器
KR1020197016353A KR102372114B1 (ko) 2016-12-19 2017-12-15 종전압 조정기
PCT/EP2017/083141 WO2018114714A1 (fr) 2016-12-19 2017-12-15 Régulateur de tension linéaire
US16/442,577 US10866604B2 (en) 2016-12-19 2019-06-17 Longitudinal voltage regulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16204981.1A EP3336650B1 (fr) 2016-12-19 2016-12-19 Dispositif de réglage de tension longitudinale

Publications (2)

Publication Number Publication Date
EP3336650A1 EP3336650A1 (fr) 2018-06-20
EP3336650B1 true EP3336650B1 (fr) 2023-03-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP16204981.1A Active EP3336650B1 (fr) 2016-12-19 2016-12-19 Dispositif de réglage de tension longitudinale

Country Status (8)

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US (1) US10866604B2 (fr)
EP (1) EP3336650B1 (fr)
KR (1) KR102372114B1 (fr)
CN (1) CN110073306B (fr)
DK (1) DK3336650T3 (fr)
ES (1) ES2941248T3 (fr)
PL (1) PL3336650T3 (fr)
WO (1) WO2018114714A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA3153423A1 (fr) * 2021-09-29 2023-03-29 PTI Transformers Inc. Appareil et methode de regulateur electronique de tension

Citations (4)

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EP0637122A1 (fr) * 1993-07-10 1995-02-01 World Limited Co., Ltd Appareil et procédé pour le réglage de la proportion d'abaissement d'un autotransformateur en réponse à la tension à l'entrée
US5568398A (en) * 1993-12-10 1996-10-22 Siemens Energy & Automation, Inc. Electronic operations counter for a voltage regulator controller
CN2814480Y (zh) * 2005-08-16 2006-09-06 李民 叠加式交流电压调压装置
EP2390750A1 (fr) * 2009-01-20 2011-11-30 CSKK(HKG) Limited Régulateur de tension automatique et transformateur toroïdal

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ES2103129T3 (es) * 1993-05-14 1997-08-16 Citeq Metodo de cambio de fase de los voltajes aplicados a componentes de circuito que interconectan dos redes de ca polifasicas sincronicas y un aparato de interconexion de cambio de fase al respecto.
NO317045B1 (no) * 2000-05-24 2004-07-26 Magtech As Magnetisk pavirkbar strom- eller spenningsregulerende anordning
US6693805B1 (en) * 2002-07-31 2004-02-17 Lockheed Martin Corporation Ripple cancellation circuit for ultra-low-noise power supplies
US6737837B1 (en) * 2002-11-25 2004-05-18 Abb Ab Device and a method for control of power flow in a transmission line
JP4350749B2 (ja) * 2003-06-20 2009-10-21 シーメンス パワー トランスミッション アンド ディストリビューション インコーポレイテッド Ａｎｓｉタイプａ電圧調整器
US6906476B1 (en) * 2003-07-25 2005-06-14 Asp Corporation Power control system for reducing power to lighting systems
CN101416365B (zh) * 2006-03-28 2011-05-18 Abb研究有限公司 用于控制传输线路中电力潮流的装置和方法
CN101206490A (zh) * 2006-12-20 2008-06-25 鸿富锦精密工业（深圳）有限公司 三相交流稳压器
US8519681B2 (en) * 2011-02-11 2013-08-27 Siemens Energy, Inc. Apparatus and method for generating a metering voltage output for a voltage regulator using a microprocessor
US8907530B1 (en) * 2011-11-03 2014-12-09 Paul Saxton System for reducing power consumption in a structure
CN102832810B (zh) * 2012-08-30 2015-04-08 成都芯源系统有限公司 自举电压刷新控制电路、电压转换电路及相关控制方法
WO2016022230A1 (fr) * 2014-08-05 2016-02-11 Cooper Technologies Company Régulateur de tension pour un système de distribution de puissance et son procédé de commande
US10147562B2 (en) 2014-11-25 2018-12-04 Hai Wang On-load voltage regulation tap switch for transformer and switch control method
EP3043362A1 (fr) * 2015-01-07 2016-07-13 ABB Technology AG Transformateur de régulation de la tension

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0637122A1 (fr) * 1993-07-10 1995-02-01 World Limited Co., Ltd Appareil et procédé pour le réglage de la proportion d'abaissement d'un autotransformateur en réponse à la tension à l'entrée
US5568398A (en) * 1993-12-10 1996-10-22 Siemens Energy & Automation, Inc. Electronic operations counter for a voltage regulator controller
CN2814480Y (zh) * 2005-08-16 2006-09-06 李民 叠加式交流电压调压装置
EP2390750A1 (fr) * 2009-01-20 2011-11-30 CSKK(HKG) Limited Régulateur de tension automatique et transformateur toroïdal

Also Published As

Publication number Publication date
WO2018114714A1 (fr) 2018-06-28
ES2941248T3 (es) 2023-05-19
KR20190094357A (ko) 2019-08-13
US10866604B2 (en) 2020-12-15
EP3336650A1 (fr) 2018-06-20
DK3336650T3 (da) 2023-05-30
PL3336650T3 (pl) 2023-07-03
KR102372114B1 (ko) 2022-03-07
CN110073306A (zh) 2019-07-30
US20190302814A1 (en) 2019-10-03
CN110073306B (zh) 2021-03-26

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