WO2019024977A1 - A lead exit arrangement - Google Patents
A lead exit arrangement Download PDFInfo
- Publication number
- WO2019024977A1 WO2019024977A1 PCT/EP2017/069349 EP2017069349W WO2019024977A1 WO 2019024977 A1 WO2019024977 A1 WO 2019024977A1 EP 2017069349 W EP2017069349 W EP 2017069349W WO 2019024977 A1 WO2019024977 A1 WO 2019024977A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bushing
- transformer
- tank
- reactor
- lead
- Prior art date
Links
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
- H01F27/02—Casings
- H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
Definitions
- This invention relates to a lead exit arrangement for a high voltage (HV) transformer or reactor.
- the invention also relates to a transformer or reactor having said lead exit arrangement.
- the invention also relates to a power distribution network including said transformer or reactor.
- a transformer or reactor typically comprises an inductive element, such as windings, mounted within a tank or housing.
- a lead exit arrangement provides an external connection to the internal inductive element of the transformer or reactor.
- the lead exit arrangement typically includes a bushing and associated electrostatic shielding and insulation.
- the bushing carries a conductor that at one end connects to the inductive element by way of a winding lead and at the other end provides a terminal of the transformer.
- the terminal allows, for example, external equipment or a power distribution network to be connected to the transformer.
- the bushing is typically mounted in a turret, which extends from the external surface of the transformer housing.
- the turret supports the bushing and houses the connection between the bushing and the winding lead that extends from the windings, through an aperture in the housing and into the turret.
- Shielding and insulation referred to as a stress shield, surrounds the connection between the bushing and the winding lead in the turret.
- the turrets and bushings are usually detached for transportation of the transformer after manufacture and testing. Therefore, the transformer must be carefully reassembled on site. Care must be taken to ensure that the apparatus is returned to the same condition in which it was tested in the factory.
- the turret While replacing the turret and bushing the stress shield must be carefully positioned to ensure its insulating integrity.
- the turret is also typically filled with an insulating fluid, such as an oil, and the insulation is conditioned accordingly.
- the need to detach the turret for transportation may prolong exposure of the lead exit arrangement's hygroscopic insulation to the environment, which can increase the risk of contamination.
- a lead exit arrangement for a high voltage transformer/reactor comprising an elongate bushing having a bushing axis, a stress shield located at a base of the bushing for receiving a winding lead from a transformer/reactor and housing a connection between the winding lead and the base of the bushing, the stress shield configured to receive said winding lead in a direction off-axis with respect to the bushing axis.
- the stress shield is configured such that the bushing extends out of the stress shield along the bushing axis and the winding lead extends into the stress shield along a second axis or direction, the angle between the bushing axis and the second axis being less than 180°.
- the stress shield may be configured such that the angle between the winding lead and the bushing axis at the point of connection between the winding lead and the base of the bushing is less than 180°.
- the angle may be less than 170° or less than 150° or less than 120°.
- the angle at which the stress shield accepts the winding lead with respect to the bushing axis and the angle at which the connection between the two parts is formed is important as it allows the lead exit arrangement to be compact.
- the lead exit arrangement may form part of a transformer or reactor.
- the transformer/reactor may comprise an ultra high voltage (UHVAC) transformer/reactor.
- the transformer/reactor may include an inductive element mounted within a tank.
- the stress shield may be mounted within the tank. This is advantageous as a turret is no longer required because the stress shield, which houses the connection between the bushing and the winding lead, is mounted within the tank rather than external to the tank within the turret structure.
- a transformer/reactor having an inductive element mounted within a tank wherein a stress shield forming an insulating structure around the connection between a lead of the transformer/reactor and a bushing may form an aspect of the invention.
- the bushing may be arranged such that it extends through an aperture in the tank.
- the tank may be configured to support the bushing at the point it projects through the tank.
- the bushing may include a first end, which is received within the stress shield and a second end, opposite the first end, which forms a terminal of the transformer/reactor, the first end and second end separated by a central section, wherein the tank is configured to engage and support the bushing by its central section.
- the inductive element may comprise one or two (or more) coils or windings mounted side by side and said stress shield of the lead exit arrangement may be mounted at least partly between said coils.
- This can lead to a particularly compact design as the stress shield can occupy the space between the sides of the two substantially cylindrical coils and may fit within a linear perimeter extending between the outside edges of the coils.
- the stress shield may be mounted to and supported by an insulating support structure that extends within the tank.
- the tank may contain an insulating fluid and said fluid may immerse said stress shield and said inductive element.
- the stress shield may be configured to receive more than one winding lead.
- the further winding lead may also be received into the stress shield in a direction other than along the bushing axis.
- a method of assembling a lead exit arrangement for a HV transformer/reactor said transformer/reactor including a tank configured to house an inductive element of the transformer/reactor, the method comprising; a) mounting a stress shield within said tank; b) mounting a base of an elongate bushing in said stress shield, said bushing extending along a bushing axis; c) mounting a winding lead from the inductive element to said base of the bushing, said winding lead received into said stress shield in a direction off axis with respect to the bushing axis.
- a power distribution network including a transformer/reactor having the lead exit arrangement of the first aspect of the invention.
- Figure 1 shows a plan view of a transformer including the lead exit arrangement in which the bushing is shown with transparency
- Figure 2 shows a front view of a transformer shown in Figure 2;
- Figure 3 shows a side view of the transformer shown in Figures 2 and 3;
- Figure 4 shows a flow chart illustrating a method of assembling a lead exit arrangement in a transformer.
- FIGS 1 to 3 show a lead exit arrangement 1 for an ultra high voltage transformer 20. It will be appreciated that the lead exit arrangement is equally applicable to a reactor, although the examples below will refer only to a transformer for brevity.
- the lead exit arrangement comprises an elongate bushing 2 having a bushing axis B (shown in figure 3).
- the bushing 2 comprises an insulated conductor 4 (shown schematically in Figure 2) that provides an electrical connection to the transformer 20.
- the arrangement 1 further comprises a stress shield 5 located at a base 6 of the bushing 2 for receiving a winding lead 7 from the transformer 20 and housing an electrical connection 8 between the winding lead 7 and the base 6 of the bushing 2.
- the stress shield 5 is configured to receive said winding lead 7 in a direction off-axis with respect to the bushing axis B.
- the stress shield 5 provides an insulating function around the junction between the winding lead and the bushing.
- the winding lead 7 comprises an electrical conductor that extends from an inductive element of the transformer 20, comprising windings 10.
- the windings 10, in this example, are arranged as two coils 11 and 12.
- the winding lead 7 thus provides an electrical connection between the coils 11, 12 and the bushing 2.
- two winding leads 7a and 7b are received by the stress shield 5, one from each of the coils 11, 12. It will be appreciated that the stress shield 5 may be configured to receive only one lead, two leads, or more.
- the coils 11 and 12 are substantially cylindrical structures having insulation there around and are mounted side by side, as is conventional, with their axes parallel to one another.
- the stress shield 5 and the connection 8 is mounted in a gap 22 between the two coils 11, 12. This is possible due to the stress shield 5 accepting the winding lead 7 at an angle to the bushing axis.
- the inductive element 11, 12 of the transformer 20 is mounted with a tank 21, which forms a housing for the coils 11, 12.
- the stress shield 5 and connection 8 is also mounted within the tank 21.
- the tank 21 also includes a support structure 23 to which the stress shield 5 is mounted.
- the stress shield 5 sits within the space defined by the gap 22 and tank 21.
- the tank 21 also includes an aperture 24 in an upper surface which allows the bushing 2 to extend out of the tank.
- the bushing 2 comprises a first end 13 at which the connection 8 is made and which is received within the stress shield 5.
- the bushing also has a second end 14, opposite the first end 13, which includes a terminal 15 which provides the electrical connection to the transformer 20.
- the terminal 15 comprises the terminal end of the conductor 4 that extends through the bushing 2.
- the first end 13 comprises the base 6 of the bushing 2.
- the first end 13 and second end 14 are separated by a central section 16.
- the arrangement 1 is configured such that the central section 16 of the bushing 2 extends through the aperture 24.
- the central section 16 may include a flange 17 arranged to be connected to the tank 21.
- the tank 21 may include an annular ring 25 adapted to engage the flange 17.
- the tank supports the bushing 2 by its central section as it projects through a wall of the tank 21.
- the stress shield 5 comprises a substantially spherical or ovoidal conducting body with insulating walls that houses the connection 8.
- the stress shield 5 is supported by an insulating support structure 18 mounted within the tank 21.
- Figure 3 shows the angular relationship between the winding lead 7 and the bushing 2.
- Bushing 2 is received into the stress shield 5 along a bushing axis B.
- the stress shield 5 includes an aperture 30 for receiving the bushing 2.
- the stress shield 5 also includes a lead aperture 31 (in this embodiment two lead apertures) which receives the winding leads.
- One of the winding leads is received along an axis L.
- the lead axis L does not lie along the axis B and is therefore off-axis with respect to the bushing axis B.
- the axes L and B are not parallel to one another.
- An angle C formed between the axis B and the axis L is therefore less than 180°.
- the angle between the bushing axis and the lead 7 at the connection 8 is also less than 180°.
- the connection 8 between the lead 7 and the base of the bushing is formed at an obtuse angle rather than end to end.
- the other winding lead is also received along an axis arranged at a similar angle to the bushing axis B, as viewed in Figure 3.
- the other winding lead has a similar angular relationship to the bushing axis B.
- the axes L substantially perpendicular to the axis of the coils 11, 12.
- the bushing 2 thus extends at an acute angle away from directly upward and the lead(s) 7 extend at an angle substantially perpendicular to the upward direction (as the coils, in this example, are mounted with their axes parallel to the upward direction).
- Figure 4 shows a flow chart illustrating the method of mounting a stress shield within said tank shown as step 50.
- Step 51 shows mounting a base of an elongate bushing in said stress shield, said bushing extending along a bushing axis.
- Step 52 shows mounting a winding lead from the inductive element to said base of the bushing, said winding lead received into said stress shield in a direction off axis with respect to the bushing axis.
- Step 53 shows securing a central section of the bushing to the tank, at a point where it extends through an aperture in the tank.
- Step 54 shows filling the tank with an insulating fluid and thereby immersing the stress shield and inductive element in said fluid.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR112020001296-3A BR112020001296A2 (en) | 2017-07-31 | 2017-07-31 | conductor output arrangement for a high voltage transformer / reactor, transformer / reactor, method of assembling a conductor output arrangement for a transformer / reactor and power distribution network |
PCT/EP2017/069349 WO2019024977A1 (en) | 2017-07-31 | 2017-07-31 | A lead exit arrangement |
CN201780093509.7A CN110914935A (en) | 2017-07-31 | 2017-07-31 | Lead wire outlet assembly |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2017/069349 WO2019024977A1 (en) | 2017-07-31 | 2017-07-31 | A lead exit arrangement |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2019024977A1 true WO2019024977A1 (en) | 2019-02-07 |
Family
ID=59569306
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2017/069349 WO2019024977A1 (en) | 2017-07-31 | 2017-07-31 | A lead exit arrangement |
Country Status (3)
Country | Link |
---|---|
CN (1) | CN110914935A (en) |
BR (1) | BR112020001296A2 (en) |
WO (1) | WO2019024977A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1542886A (en) * | 1975-04-03 | 1979-03-28 | Alsthom Savoisienne | Mounting box for supporting a bushing |
JPS60140710A (en) * | 1983-12-28 | 1985-07-25 | Toshiba Corp | Transformer |
JPH06283347A (en) * | 1993-03-25 | 1994-10-07 | Toshiba Corp | Split type transformer |
EP2528071A1 (en) * | 2011-05-27 | 2012-11-28 | ABB Technology Ltd | High voltage arrangement comprising an insulating structure |
EP2942795A1 (en) * | 2014-05-07 | 2015-11-11 | ABB Technology Ltd | High voltage electromagnetic induction device |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE904078C (en) * | 1942-04-15 | 1954-02-15 | Aeg | Large transformer, especially traveling transformer |
JPS5642313A (en) * | 1979-09-14 | 1981-04-20 | Fuji Electric Co Ltd | Shielding for high-tension bushing of oil-immersed induction apparatus |
JPS58112313A (en) * | 1981-12-25 | 1983-07-04 | Toshiba Corp | Transformer |
JPS6046013A (en) * | 1983-08-24 | 1985-03-12 | Hitachi Ltd | Electric apparatus |
JPH0612735B2 (en) * | 1985-12-27 | 1994-02-16 | 株式会社東芝 | Bushing connection device |
JPH05234780A (en) * | 1992-02-24 | 1993-09-10 | Toshiba Corp | Transformer |
CN101640114B (en) * | 2009-07-06 | 2011-06-22 | 保定天威保变电气股份有限公司 | Extra-high voltage transformer lead shielding device |
CN103227039B (en) * | 2013-05-16 | 2016-05-04 | 山东电力设备有限公司 | A kind of extra-high voltage transformer outgoing line device |
KR101942375B1 (en) * | 2015-07-15 | 2019-01-28 | 현대일렉트릭앤에너지시스템(주) | Transformer having center lead entrance |
-
2017
- 2017-07-31 CN CN201780093509.7A patent/CN110914935A/en active Pending
- 2017-07-31 WO PCT/EP2017/069349 patent/WO2019024977A1/en active Application Filing
- 2017-07-31 BR BR112020001296-3A patent/BR112020001296A2/en active Search and Examination
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1542886A (en) * | 1975-04-03 | 1979-03-28 | Alsthom Savoisienne | Mounting box for supporting a bushing |
JPS60140710A (en) * | 1983-12-28 | 1985-07-25 | Toshiba Corp | Transformer |
JPH06283347A (en) * | 1993-03-25 | 1994-10-07 | Toshiba Corp | Split type transformer |
EP2528071A1 (en) * | 2011-05-27 | 2012-11-28 | ABB Technology Ltd | High voltage arrangement comprising an insulating structure |
EP2942795A1 (en) * | 2014-05-07 | 2015-11-11 | ABB Technology Ltd | High voltage electromagnetic induction device |
Also Published As
Publication number | Publication date |
---|---|
CN110914935A (en) | 2020-03-24 |
BR112020001296A2 (en) | 2020-07-28 |
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