EP3839992A1 - Moyen de traction à culasse en tant qu'enroulement auxiliaire dans un transformateur ou une bobine d'inductance - Google Patents

Moyen de traction à culasse en tant qu'enroulement auxiliaire dans un transformateur ou une bobine d'inductance Download PDF

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Publication number
EP3839992A1
EP3839992A1 EP19217895.2A EP19217895A EP3839992A1 EP 3839992 A1 EP3839992 A1 EP 3839992A1 EP 19217895 A EP19217895 A EP 19217895A EP 3839992 A1 EP3839992 A1 EP 3839992A1
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EP
European Patent Office
Prior art keywords
yoke
transformer
auxiliary winding
choke
tension
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.)
Withdrawn
Application number
EP19217895.2A
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German (de)
English (en)
Inventor
Jürgen HOCHEGGER
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 EP19217895.2A priority Critical patent/EP3839992A1/fr
Publication of EP3839992A1 publication Critical patent/EP3839992A1/fr
Withdrawn legal-status Critical Current

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    • 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

Definitions

  • the invention relates to a transformer or a choke, with a magnetic core comprising at least one leg with a winding arrangement and a yoke, wherein the core, in particular the yoke, has several layers, which layers are braced with the aid of at least one electrically conductive yoke tension means, wherein an auxiliary winding is provided for direct current compensation and / or for power supply.
  • the invention further relates to a method for producing an auxiliary winding comprising at least one yoke tension means.
  • WO 2016/139030 A1 proposed to arrange an auxiliary winding in a transformer in addition to the usual winding arrangement, into which a compensation current is fed, the magnetic effect of which is directed so that it counteracts or compensates for the magnetic constant flux in the core.
  • auxiliary winding arrangements require appropriate space. Usually these are arranged in the mounting plate or in the pressure ring below or above the actual windings, which increases the yoke spacing due to the mechanical and electrical distances required for the auxiliary winding arrangement and increases the complexity of the windings. This in turn increases the size of the transformers, which on the one hand makes transport more difficult and costly and on the other hand - due to the now larger volume of the transformer housing - more oil is required.
  • the recesses in the mounting plate or in the pressure ring necessary for the auxiliary winding arrangements lead to a mechanical weakening of the transformer.
  • the object set out at the beginning is achieved with a transformer or a choke, with a magnetic core comprising at least one leg with a winding arrangement and a yoke, the core, in particular the yoke, having several layers, which layers are braced with the aid of at least one electrically conductive yoke tension means are, wherein an auxiliary winding is provided for direct current compensation and / or for power supply, achieved according to the invention in that the auxiliary winding comprises at least one yoke tension means.
  • Both the transformer according to the invention and the choke according to the invention have a core which comprises several layers.
  • the core is pressed together with the help of clamping frame elements.
  • the clamping frame elements are usually arranged on opposite sides of the yoke and are held together under tension with the aid of at least one yoke tension means, so that the yoke is clamped between the clamping frame elements.
  • the at least one yoke tension means is arranged in the area of the core, in particular in the area of the yoke, wherein the yoke tension means can be designed in the form of a bolt or rod as a yoke tension bolt and / or in the form of a band as a yoke tension band.
  • the auxiliary winding has the at least one yoke tension means. Due to the auxiliary winding according to the invention, at least one additional winding, which serves as an auxiliary winding, is no longer necessary in a mounting plate of the Transformer, to be provided in a pressure ring of the transformer or on the yoke of the transformer. This ensures that the structural design of the winding arrangement and the structural design of the core do not have to be changed.
  • the invention makes it possible to provide an auxiliary winding in a transformer or a choke without great structural and financial effort, without changing the size of the transformer or the choke, the auxiliary winding of the direct current compensation and / or the power supply of the transformer or the throttle can serve.
  • the at least one yoke tension means is arranged at least partially surrounding a section of the yoke. That is to say, the auxiliary winding, which comprises the at least one yoke tension means, is arranged on the yoke of the transformer, which results in a particularly cost-effective production of the auxiliary winding.
  • the at least one yoke tension means surrounds 25% to 50% of a circumference of the yoke. On the one hand, this ensures a secure and stable tensioning of the layers of the core. On the other hand, this ensures that large parts of the auxiliary winding are already present on the transformer and do not have to be attached additionally.
  • the at least one yoke tension means has an insulated screw connection means at each end. That is to say, the at least one yoke tension means is provided with an insulated screw connection at both ends, which ensures that there are no undesired circulating currents. This also makes it easy to connect other elements of the Auxiliary winding to the at least one yoke tension means guaranteed.
  • the at least one yoke tension means can be connected to at least one current control device.
  • the current control device is used to feed in a compensation current so that a direct flux component flowing in one leg of the core can be compensated by regulating the current control device accordingly.
  • the core comprises an upper yoke and a lower yoke, with at least one yoke tensioning means bracing the upper yoke and at least one yoke tensioning means bracing the lower yoke.
  • Both transformers and chokes can be arranged standing or lying in an operating state.
  • the lower yoke in the case of a standing arrangement of a transformer or a choke, viewed in the direction of gravity, the lower yoke is arranged below the upper yoke.
  • the lower yoke In the case of a horizontal arrangement, the lower yoke is again arranged next to or behind the upper yoke, seen in a direction transverse to the direction of gravity.
  • each winding assembly is pressed between two pressure plates which are inserted between the upper yoke and the upper end of the winding assembly and between the lower yoke and the lower end of the winding assembly.
  • the clamping frame elements assigned to the upper yoke are connected via clamping elements to the clamping frame elements assigned to the lower yoke.
  • auxiliary winding is arranged on the upper yoke. But it would also be conceivable that the auxiliary winding is arranged on the lower yoke. Of course, it is also not ruled out that one or more auxiliary windings are arranged on both the upper and the lower yoke.
  • the corresponding arrangement of the auxiliary winding or the auxiliary windings is often dependent on the connection of the supply lines, i.e. where corresponding bushings are provided in the tank of the transformer or the choke or in the cover of the transformer or the choke.
  • one turn of the auxiliary winding comprises two yoke pulling means opposite one another with respect to the yoke and at least one electrically conductive connecting means, the at least one electrically conductive connecting means connecting the two yoke pulling means to one another.
  • At least two yoke pulling means opposite one another with respect to the yoke are provided on a yoke. That is to say, the opposing yoke pulling means are each connected at the end to the tensioning frame elements which are arranged on lateral surfaces of the yoke and thereby brace the corresponding yoke.
  • a first yoke tension means is arranged on an upper side of the yoke
  • a second yoke tension means is arranged opposite the first yoke tension means on the lower side of the same yoke.
  • the first yoke tension means is connected at both ends to an upper region of the two laterally arranged tensioning frame elements
  • the second yoke tension means is connected at both ends to a lower region Area of the two laterally arranged clamping frame elements is connected.
  • the two opposing yoke tension means are connected to one another with at least one electrically conductive connection means.
  • the two opposite yoke pulling means surrounding the upper yoke are each a yoke pulling bolt
  • the two opposing yoke pulling means surrounding the lower yoke are a yoke pulling bolt and a yoke pulling strap
  • the yoke pulling bolt on an upper side of the Is arranged lower yoke
  • the yoke tension band is arranged on an underside of the lower yoke.
  • the first upper yoke tension means arranged on the top of the yoke is connected at one end to a connection means, which in turn can be connected to a current control device, and is connected to a connection means at another end , which is connected to one end of a first lower yoke pulling means opposite to the first upper yoke pulling means.
  • the first lower yoke pulling means is in turn connected at another end to a connecting means, which is connected to one end of a second upper yoke pulling means.
  • Another end of the second upper yoke pulling means is also connected to a connecting means which is connected to one end of a second lower yoke pulling means, which is opposite to the second upper yoke pulling means.
  • the second lower yoke tension means is in turn connected at another end to a connection means which can be connected to the current control device.
  • an auxiliary winding can comprise several turns that are interconnected, the number of turns usually depending on the required voltage of the auxiliary winding.
  • a series connection of the windings is used when a high voltage is required. If a high current is required, the windings are connected in parallel. It would of course also be conceivable for the windings to be connected partly in series and partly in parallel.
  • This method makes it possible to provide an auxiliary winding in a transformer or a choke with very little effort and at very low cost without changing the size of the transformer or the choke.
  • one turn of the auxiliary winding comprising two yoke pulling means opposite one another with respect to the yoke and at least one electrically conductive connecting means, it is provided that the at least one electrically conductive connecting means and the two yoke pulling means are connected to one another.
  • Fig. 1 shows an axonometric representation of a transformer 1 comprising two auxiliary windings 7 according to the prior art, the transformer 1 having a magnetic core 2 which comprises three legs 3 each with a winding arrangement 14 and an upper yoke 4a and a lower yoke 4b.
  • the core 2 has several layers 5 which are pressed together in the area of the upper yoke 4 a and the lower yoke 4 b with the aid of clamping frame elements 11.
  • clamping frame elements 11 are arranged, which are held together under tension with the aid of several yoke pulling means 6, so that both the upper yoke 4a and the lower yoke 4b are clamped between the clamping frame elements 11 .
  • the yoke pulling means 6, which are arranged on the upper yoke 4a, are yoke pulling bolts 6a.
  • the upper yoke 4a two yoke tension bolts 6a are arranged opposite one another, each end connected to the clamping frame elements 11. That is, each yoke tension bolt 6a, which is arranged on an upper side of the upper yoke 4a, is opposed to a yoke tension bolt 6a, which is arranged on a lower side of the upper yoke 4a (in Fig. 1 not visible).
  • each yoke tension bolt 6a is arranged on an upper side of the lower yoke 4b (in Fig. 1 not visible), there is a yoke tension band 6b opposite, which is arranged on a lower side of the lower yoke 4b.
  • each of the winding arrangements 14 is arranged between pressure plates 12 and mounting plates 13, which compress the winding assemblies 14 together.
  • one of the pressure plates 12 is arranged between the upper yoke 4 a and the upper end of a winding arrangement 14, while in each case one of the mounting plates 13 is arranged between the lower yoke 4 b and the lower end of the winding arrangement 14.
  • the clamping frame elements 11 assigned to the upper yoke 4a are secured by clamping elements (in Fig. 1 not visible) with the clamping frame elements 11 assigned to the lower yoke 4b.
  • the in Fig. 1 The transformer 1 shown has two additional windings serving as auxiliary windings 7, which are arranged in mounting plates 13 of the transformer 1.
  • the two auxiliary windings 7 are used for direct current compensation.
  • the two auxiliary windings 7 are each connected to a current control device (not shown) which is used to feed in a compensation current.
  • Fig. 2 is an axonometric representation of a transformer 1 according to the invention comprising two auxiliary windings 7.
  • the structure of the transformer 1 according to the invention corresponds to the structure of the transformer 1 according to the prior art, with the difference that the auxiliary windings 7 each have at least one yoke 6.
  • auxiliary windings 7 are arranged on the lower yoke 4b, which auxiliary windings 7 each have two turns 9.
  • each turn 9 of the auxiliary windings 7 comprises a yoke tension bolt 6a, which is arranged on the upper side of the lower yoke 4b, a yoke tension band 6b opposite the yoke tension bolt 6a, which is attached to the lower side of the lower yoke 4b, as well as connecting means 10.
  • Both the yoke tension bolt 6a and the yoke tension band 6b of a turn 9 each surround approximately 35% of a circumference of the lower yoke 4b.
  • both the yoke tension bolt 6a and the yoke tension band 6b are connected to the clamping frame elements 11 arranged around the lower yoke 4b with the aid of screw connection means 8.
  • auxiliary windings 7 arranged on the lower yoke 4b.
  • Each auxiliary winding 7 comprises two turns 9 which are connected to connecting means 10.
  • each auxiliary winding has the following structure: A first of the two yoke tension bolts 6a arranged on the top of the yoke 4 is connected at one end to a connecting means 10, which in turn - in the case of direct current compensation - is connected to a current control device , and is connected at another end to a connecting means 10 which is connected to one end of a first of the two yoke tension bands 6b arranged on the underside of the yoke 4, which first yoke tension band 6b is opposite the first yoke tension bolt 6a.
  • the first yoke tension band 6b is in turn connected at another end to a connecting means 10 which is connected to one end of a second yoke tension bolt 6a.
  • Another end of the second yoke tension bolt 6a is also connected to a connecting means 10 which is connected to one end of a second lower yoke tension band 6b, which is opposite the second yoke tension bolt 6a.
  • the second yoke tension band 6b is in turn connected at another end to a connecting means 10 which is connected to the current control device.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP19217895.2A 2019-12-19 2019-12-19 Moyen de traction à culasse en tant qu'enroulement auxiliaire dans un transformateur ou une bobine d'inductance Withdrawn EP3839992A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19217895.2A EP3839992A1 (fr) 2019-12-19 2019-12-19 Moyen de traction à culasse en tant qu'enroulement auxiliaire dans un transformateur ou une bobine d'inductance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19217895.2A EP3839992A1 (fr) 2019-12-19 2019-12-19 Moyen de traction à culasse en tant qu'enroulement auxiliaire dans un transformateur ou une bobine d'inductance

Publications (1)

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EP3839992A1 true EP3839992A1 (fr) 2021-06-23

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Application Number Title Priority Date Filing Date
EP19217895.2A Withdrawn EP3839992A1 (fr) 2019-12-19 2019-12-19 Moyen de traction à culasse en tant qu'enroulement auxiliaire dans un transformateur ou une bobine d'inductance

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2406045A (en) * 1944-05-30 1946-08-20 Bell Telephone Labor Inc Inductance device
GB952694A (en) * 1961-04-12 1964-03-18 Licentia Gmbh Improvements relating to magnetic cores
EP3065150A1 (fr) * 2015-03-05 2016-09-07 Siemens Aktiengesellschaft Transformateur et procédé de rééquipement d'un transformateur

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2406045A (en) * 1944-05-30 1946-08-20 Bell Telephone Labor Inc Inductance device
GB952694A (en) * 1961-04-12 1964-03-18 Licentia Gmbh Improvements relating to magnetic cores
EP3065150A1 (fr) * 2015-03-05 2016-09-07 Siemens Aktiengesellschaft Transformateur et procédé de rééquipement d'un transformateur
WO2016139030A1 (fr) 2015-03-05 2016-09-09 Siemens Aktiengesellschaft Transformateur et procédé de post-équipement d'un transformateur

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