EP3796349A1 - Bobine d'inductance pourvue de noyau de fer réglable - Google Patents

Bobine d'inductance pourvue de noyau de fer réglable Download PDF

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Publication number
EP3796349A1
EP3796349A1 EP19198584.5A EP19198584A EP3796349A1 EP 3796349 A1 EP3796349 A1 EP 3796349A1 EP 19198584 A EP19198584 A EP 19198584A EP 3796349 A1 EP3796349 A1 EP 3796349A1
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EP
European Patent Office
Prior art keywords
choke coil
trapezoidal thread
iron core
tgs
coil according
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
EP19198584.5A
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German (de)
English (en)
Other versions
EP3796349B1 (fr
Inventor
Peter GRIEBLER
Helmut Reisinger
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 Energy Global GmbH and Co KG
Original Assignee
Siemens Energy Global GmbH and Co KG
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Application filed by Siemens Energy Global GmbH and Co KG filed Critical Siemens Energy Global GmbH and Co KG
Priority to EP19198584.5A priority Critical patent/EP3796349B1/fr
Publication of EP3796349A1 publication Critical patent/EP3796349A1/fr
Application granted granted Critical
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    • 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

Definitions

  • the invention relates to a choke coil with an adjustable iron core and trapezoidal thread drive, the iron core being connected to a trapezoidal thread nut which is arranged on a trapezoidal thread spindle protruding into the iron core.
  • Reactors have been in use for many years to compensate for capacitive reactive power in transmission networks and to ensure the stability of energy transmission.
  • reactors are a relatively inexpensive solution.
  • Compensation reactors are used to compensate for capacitive reactive power of the transmission lines, which occur in particular in lightly loaded or idle networks, reduce network-frequency overvoltages in the event of sudden load shedding or an idle network, and thus improve the stability and economy of energy transmission.
  • Compensation reactors with oil filling are typically manufactured in two types: with an iron core divided by air gaps or without an iron core, with magnetic yoke.
  • Compensation choke coils with oil filling are generally designed with so-called ONAN cooling, i.e. with natural convection of the ambient air, or with high output also with ONAF cooling, in which the air flow is forced by a fan.
  • Star point earthing chokes are used to compensate the fault current in the event of unintentional earth faults in a conductor in an AC voltage system.
  • Earth faults are the most common cause of business interruptions in electrical power distribution networks.
  • a network star point is connected via a high-resistance reactance, the so-called earth fault extinguishing coil (Petersenspule) grounded, whereby the earth fault extinguishing coil is matched to the earth capacitance of the network.
  • the earth fault extinguishing coil Pule
  • the required power of the earth fault extinguishing coil is therefore dependent on the size and type of the network (overhead line, cable or mixed network).
  • variable inductance - earth-fault extinguishing coils enables optimal compensation of the earth-fault current and thus optimal utilization of the advantages of earth-fault extinction.
  • the change in inductance can take place according to two basic principles, namely by switching operations on the coil, which cause the connection or disconnection of winding parts or partial coils, or by continuously adjusting the air gap of the magnetic circuit of the E-coil with the help of an adjustment mechanism (plunger core coil) .
  • Immersion core coils have the advantage that no switching operations are required for inductance adjustment, which can cause network disruption, especially in the event of a ground fault, and they can be adjusted to a minimum current at the fault location due to their continuous adjustability.
  • the adjustment mechanism can, for example, be designed as a trapezoidal thread drive in which the core is connected to a trapezoidal thread nut.
  • This converts the rotary movement of the drive motor into a longitudinal movement of the core in the air gap of the coil and thus changes the inductance of the coil.
  • the invention is therefore based on the object of specifying a choke coil with an adjustable iron core in which the adjustment noise is reduced.
  • the invention is based on the knowledge that the adjustment noise is mainly due to the poor lubricating properties of the transformer oil.
  • Transformer oil is a highly refined mineral oil or a low-viscosity silicone oil or a natural ester or a synthetic ester that is stable at high temperatures and has good electrical insulating properties.
  • its lubricating properties i.e. in particular its viscosity and flow behavior, are worse than the corresponding properties of special lubricating oils.
  • the part of the trapezoidal thread spindle that extends outside the iron core is now surrounded by a sheath, which can consist, for example, of a bellows or a telescopic tube.
  • the casing separates a lubricating fluid surrounding the trapezoidal thread spindle from the transformer oil of the reactor.
  • the area of the lubricating oil enclosed by the shell is preferably connected to an expansion tank with which changes in volume due to the movement of the iron core or possibly due to temperature fluctuations can be compensated for.
  • the choke coil according to the invention is particularly suitable for use as an earth fault extinguishing coil in an electrical power distribution network.
  • the choke coil is preferably controlled by means of a ground fault compensation controller, for example TYPE EFC20 from Trench Austria.
  • the trapezoidal thread drive can be driven by an electric motor, it is advantageous if a hand crank and a potentiometer are provided for remote position display in emergencies, i.e. if the electric motor fails.
  • the choke coil according to the figures comprises a housing G with a coil SP and a yoke J, in the interior of which an iron core EK is arranged displaceably in order to be able to change the inductance of the coil SP.
  • the adjustment mechanism is designed as a trapezoidal thread drive with a trapezoidal thread spindle TGS rotatably mounted in the housing and a trapezoidal thread nut TGM connected to the iron core EK.
  • This converts the rotary movement of the drive motor into a longitudinal movement of the iron core in the air gap of the coil SP and thus changes the inductance of the coil SP.
  • the choke coil according to the present embodiment is cooled with a conventional transformer oil OE, which fills the housing G to a level and largely surrounds all components such as coil SP, yoke J, iron core EK and trapezoidal thread spindle TGS.
  • a conventional transformer oil OE which fills the housing G to a level and largely surrounds all components such as coil SP, yoke J, iron core EK and trapezoidal thread spindle TGS.
  • a particularly suitable material for the trapezoidal thread spindle 7 is austenitic steel, which has sufficient stability properties, is heat and corrosion resistant and is also non-ferromagnetic.
  • austenitic steel which has sufficient stability properties, is heat and corrosion resistant and is also non-ferromagnetic.
  • any ferromagnetic or non-ferromagnetic metals, preferably stainless steels, can be used.
  • the part of the trapezoidal thread spindle TGS that extends outside the iron core is surrounded by a sheath, which in the embodiment according to FIG Figure 1 from a bellows FB and in the embodiment according to Figure 2 consists of a telescopic tube TR.
  • the casing separates a lubricating fluid surrounding the trapezoidal thread spindle from the transformer oil of the reactor. This makes it possible to use a lubricating oil that has been optimized with regard to its lubricating properties for the lubrication of the trapezoidal thread spindle TGS, while a transformer oil OE that is optimized with regard to these properties is used for the cooling and insulation tasks.
  • the area of the lubricating oil SV enclosed by the casing FB, TR is connected to an expansion tank AV, with which changes in volume due to the movement of the iron core EK or possibly due to temperature fluctuations can be compensated.
  • the area of the lubricating oil SV runs inside the casing FB, TR between the housing G and the iron core EK and continues inside the iron core EK along the trapezoidal thread spindle TGS to its base point E inside the iron core EK and the corresponding bearing.
  • This base point E is sealed by means of a shaft seal S and the lubricant is prevented from escaping.
  • the choke coil according to the invention is particularly suitable for use as an earth fault extinguishing coil in an electrical power distribution network.
  • the choke coil should be controlled by means of a ground fault compensation controller, for example TYPE EFC20 from Trench Austria.
  • the trapezoidal thread is driven by an electric motor, it is advantageous to provide a hand crank and a potentiometer for remote position display for emergencies, ie if the electric motor fails.
  • the choke coils according to the exemplary embodiments are filled with oil and the casing FB, TR according to the invention separates the lubricating oil SV from the transformer oil OE, but the use of the solution according to the invention is also conceivable in air-cooled choke coils, in which case the casing FB, TR would be the area of the lubricating oil to limit the air flowing around the throttle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Housings And Mounting Of Transformers (AREA)
EP19198584.5A 2019-09-20 2019-09-20 Bobine d'inductance pourvue de noyau de fer réglable Active EP3796349B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19198584.5A EP3796349B1 (fr) 2019-09-20 2019-09-20 Bobine d'inductance pourvue de noyau de fer réglable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19198584.5A EP3796349B1 (fr) 2019-09-20 2019-09-20 Bobine d'inductance pourvue de noyau de fer réglable

Publications (2)

Publication Number Publication Date
EP3796349A1 true EP3796349A1 (fr) 2021-03-24
EP3796349B1 EP3796349B1 (fr) 2022-08-24

Family

ID=67998280

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EP19198584.5A Active EP3796349B1 (fr) 2019-09-20 2019-09-20 Bobine d'inductance pourvue de noyau de fer réglable

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115763021A (zh) * 2022-11-23 2023-03-07 中广核达胜加速器技术有限公司 电感量可变的电感及具有其的电源
PL449993A1 (pl) * 2024-10-08 2026-04-13 Trafta Spółka Z Ograniczoną Odpowiedzialnością Trafodławik kompensacyjno-gaszący
PL449990A1 (pl) * 2024-10-08 2026-04-13 Trafta Spółka Z Ograniczoną Odpowiedzialnością Trafodławik kompensacyjno-gaszący
PL449989A1 (pl) * 2024-10-08 2026-04-13 Trafta Spółka Z Ograniczoną Odpowiedzialnością Trafodławik kompensacyjno-gaszący
PL449992A1 (pl) * 2024-10-08 2026-04-13 Trafta Spółka Z Ograniczoną Odpowiedzialnością Trafodławik kompensacyjno-gaszący
PL449991A1 (pl) * 2024-10-08 2026-04-13 Trafta Spółka Z Ograniczoną Odpowiedzialnością Dławik płynnie regulowany do kompensacji mocy biernej

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB393991A (en) * 1931-12-17 1933-06-19 Robert Francis Gilson Improvements in and relating to transformer power regulation
DE749595C (de) * 1937-12-17 1944-11-27 Abaenderung der regelbaren Drosselspule mit relativ zueinander beweglichem Kern und Lagenwicklung
EP0053686A1 (fr) * 1980-12-05 1982-06-16 Transformatoren Union Aktiengesellschaft Réactance à noyau plongeur
WO2015164896A1 (fr) * 2014-04-30 2015-11-05 Trench Austria Gmbh Bobine à noyau plongeur ainsi que tige filetée associée et son procédé de fabrication
CN107424809B (zh) * 2017-07-27 2019-03-22 国网湖北省电力公司计量中心 一种调感谐振电抗器开口铁芯双向调节机构

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB393991A (en) * 1931-12-17 1933-06-19 Robert Francis Gilson Improvements in and relating to transformer power regulation
DE749595C (de) * 1937-12-17 1944-11-27 Abaenderung der regelbaren Drosselspule mit relativ zueinander beweglichem Kern und Lagenwicklung
EP0053686A1 (fr) * 1980-12-05 1982-06-16 Transformatoren Union Aktiengesellschaft Réactance à noyau plongeur
WO2015164896A1 (fr) * 2014-04-30 2015-11-05 Trench Austria Gmbh Bobine à noyau plongeur ainsi que tige filetée associée et son procédé de fabrication
CN107424809B (zh) * 2017-07-27 2019-03-22 国网湖北省电力公司计量中心 一种调感谐振电抗器开口铁芯双向调节机构

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115763021A (zh) * 2022-11-23 2023-03-07 中广核达胜加速器技术有限公司 电感量可变的电感及具有其的电源
PL449993A1 (pl) * 2024-10-08 2026-04-13 Trafta Spółka Z Ograniczoną Odpowiedzialnością Trafodławik kompensacyjno-gaszący
PL449990A1 (pl) * 2024-10-08 2026-04-13 Trafta Spółka Z Ograniczoną Odpowiedzialnością Trafodławik kompensacyjno-gaszący
PL449989A1 (pl) * 2024-10-08 2026-04-13 Trafta Spółka Z Ograniczoną Odpowiedzialnością Trafodławik kompensacyjno-gaszący
PL449992A1 (pl) * 2024-10-08 2026-04-13 Trafta Spółka Z Ograniczoną Odpowiedzialnością Trafodławik kompensacyjno-gaszący
PL449991A1 (pl) * 2024-10-08 2026-04-13 Trafta Spółka Z Ograniczoną Odpowiedzialnością Dławik płynnie regulowany do kompensacji mocy biernej

Also Published As

Publication number Publication date
EP3796349B1 (fr) 2022-08-24

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