KR20170001907A - Power transformer - Google Patents

Power transformer Download PDF

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Publication number
KR20170001907A
KR20170001907A KR1020150091491A KR20150091491A KR20170001907A KR 20170001907 A KR20170001907 A KR 20170001907A KR 1020150091491 A KR1020150091491 A KR 1020150091491A KR 20150091491 A KR20150091491 A KR 20150091491A KR 20170001907 A KR20170001907 A KR 20170001907A
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KR
South Korea
Prior art keywords
plates
magnetic shield
shield plate
enclosure
power transformer
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KR1020150091491A
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Korean (ko)
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KR102018868B1 (en
Inventor
김동현
Original Assignee
현대중공업 주식회사
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Priority to KR1020150091491A priority Critical patent/KR102018868B1/en
Publication of KR20170001907A publication Critical patent/KR20170001907A/en
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Publication of KR102018868B1 publication Critical patent/KR102018868B1/en

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    • H01F27/365—
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Regulation Of General Use Transformers (AREA)

Abstract

A power transformer having a magnetic shielding plate on an inner wall of an enclosure is disclosed.
A power transformer is disclosed which includes an enclosure, a bushing hole formed in the enclosure and coupled with a cylindrical bushing housing, a plurality of magnetic shielding plates mounted on an inner wall of the enclosure to surround the bushing hole, And the excitation region in which the magnetic field shielding plate formed between the bushing holes is excluded, the power transformer including a supplementary magnetic shield plate provided to cover at least a part of the excitation region.
According to such a power transformer, an eddy current loss of the enclosure is reduced, and an effect of preventing a local overheating phenomenon can be obtained.

Description

[0001] POWER TRANSFORMER [0002]

The present invention relates to a power transformer, and more particularly, to a power transformer having a magnetic shield plate on the inner wall of an enclosure.

Generally, an ultra-high voltage power transformer has a magnetic shielding plate on the inner wall of the enclosure. The magnetic field shielding plate may be made of a silicon steel plate, and is formed in the shape of a long bar in the longitudinal direction.

A plurality of such magnetic circuit shielding plates are provided on the inner wall of the enclosure to reduce the loss of the enclosure due to the magnetic flux of the windings or leads provided in the transformer and prevent the local overheating phenomenon.

1 is a photograph showing a bushing housing 20 of a power transformer according to the prior art. 2 is a schematic view showing the structure of the magnetic shielding plate 30 around the bushing hole 25 of the power transformer according to the prior art and Fig. 3 is a schematic view showing the structure of the bushing hole 25 of the power transformer shown in Fig. 2 ) Of the enclosure (10) in the vicinity of the outer casing (10).

As shown in FIG. 1, the power transformer has a bushing housing 20 installed outside the enclosure 10. For the bushing accommodated in the bushing housing 20, a bushing hole 25 in which the bushing housing 20 is installed is formed in the enclosure 10.

2, the power transformer according to the related art has a disadvantage in that the magnetic shield plate 30 can not be continuously installed on the inner wall of the enclosure 10 due to the bushing hole 25. [

Accordingly, the excavation region 40 in which the magnetic field shielding plate 30 is excluded is formed around the bushing hole 25 as shown in FIG.

Due to the exclusion region 40, the power transformer according to the related art is concentrated in the outer periphery of the bushing hole 25, and the eddy current loss increases. As a result, Overheating occurs.

In one experiment, the power transformer according to the prior art showed a very high temperature of 190.4 ° C at the maximum superheating point of the exclusion zone 40 under the conditions of the outside temperature of 20 ° C and the temperature of the insulating oil inside the enclosure 10 at 52 ° C .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a power transformer capable of reducing eddy current loss of an enclosure as one aspect of the present invention.

According to one aspect of the present invention, there is provided a bushing for a vehicle, comprising: an enclosure; a bushing hole formed in the enclosure and coupled with a cylindrical bushing housing; A power transformer comprising: a plurality of magnetic shield plates; and an excitation area excluding the magnetic shield plates formed between the magnetic shield plates and the bush holes, wherein the supplemental magnetic field shielding A power transformer including a plate is provided.

The supplementary magnetic shield plate may be in the form of a straight bar, and a plurality of supplementary magnetic shield plates may be mounted in the exclusion zone.

In one embodiment, the supplementary magnetic-field shielding plate includes upper and lower-end transverse plates arranged in a longitudinal direction at upper and lower ends of the exclusion region; A both-end vertical plate disposed at both ends of the exclusion zone in a longitudinal direction; And a plurality of corner-side transverse plates arranged in the space between the upper and lower end transverse plates and the both-end transverse plates in the transverse direction.

Further, in another embodiment, the supplementary magnetic shield plate includes upper and lower end horizontal plates arranged in the lateral direction at the upper and lower ends of the exclusion zone; A both-end vertical plate disposed at both ends of the exclusion zone in a longitudinal direction; And a plurality of corner-side vertical plates arranged longitudinally in a space between the upper and lower-end-side transverse plates and the both-end vertical plates.

Further, in another embodiment, the supplementary magnetic-field shielding plate includes upper and lower end transverse plates disposed in the upper and lower ends of the exclusion zone in the transverse direction; A both-end vertical plate disposed at both ends of the exclusion zone in a longitudinal direction; A plurality of corner-side vertical plates arranged longitudinally in a corner portion of the exclusion zone; And an overlapped portion in which a portion of the upper and lower end side plates and a portion of the corner side plate are overlapped with each other.

Meanwhile, in embodiments of the present invention, the supplementary magnetic shield plate may be made of a directional material.

According to an embodiment of the present invention having such a configuration, an eddy current loss of the enclosure is reduced, and an effect of preventing a local overheating phenomenon can be obtained.

1 is a photograph showing a bushing housing of a power transformer according to a conventional technique.
2 is a schematic view showing the structure of a magnetic shield plate around a bushing hole of a power transformer according to a conventional technique
FIG. 3 is a diagram showing an eddy current loss distribution of an enclosure around a bushing hole of a power transformer according to a conventional technique. FIG.
4 is a schematic view showing a structure of a magnetic field shielding plate around a bushing hole of a power transformer according to Embodiment 1 of the present invention.
Fig. 5 is an eddy current loss distribution diagram of the enclosure around the bushing hole of the power transformer shown in Fig. 4; Fig.
6 is a schematic view showing the structure of a magnetic field shielding plate around a bushing hole of a power transformer according to a second embodiment of the present invention.
Fig. 7 is an eddy current loss distribution diagram of the enclosure around the bushing hole of the power transformer shown in Fig. 6; Fig.
8 is a schematic view showing a structure of a magnetic field shielding plate around a bushing hole of a power transformer according to a third embodiment of the present invention.
Fig. 9 is an eddy current loss distribution diagram of the enclosure around the bushing hole of the power transformer shown in Fig. 8; Fig.
10 is an analysis view showing the direction of the magnetic flux in the supplementary magnetic shield plate included in the power transformer shown in FIG.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Furthermore, the singular forms "a", "an," and "the" include plural referents unless the context clearly dictates otherwise.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

4 to 10, a power transformer according to embodiments of the present invention includes a supplementary magnetic-field shielding plate (not shown) in an exclusion zone 40 in which the magnetic-field shielding plate 30 is excluded from the inner wall of the enclosure 10, 110).

4, 6 and 8, the supplementary magnetic shield plate 110 may be formed as a linear bar independent of the magnetic shield plate 30. [

The supplementary magnetic shield plate 110 may be mounted on the inner wall of the enclosure 10 such that a plurality of supplementary magnetic shield plates 110 cover at least a portion of the exclusion area 40. [

The supplementary magnetic shield plate 110 may be made of a silicon steel plate in the same manner as a general magnetic shield plate 30, but is not limited thereto.

Hereinafter, a power transformer according to various embodiments of the present invention will be described with reference to FIGS. 2 to 10. FIG.

≪ Example 1 >

4, the supplementary magnetic shield plate 110 may include upper and lower end side plates 111, a both end side plates 112 and a corner side plates 113 in the embodiment 1 of the present invention .

The upper and lower end side plates 111 may be disposed in the upper and lower ends of the excavation region 40, that is, above and below the bushing holes 25 in the lateral direction.

For example, the upper and lower end transverse plates 111 may be configured to be longer than the diameter of the bushing hole 25 and shorter than the transverse length of the excavation region 40, but are not limited thereto.

In addition, the both end vertical plates 112 may be arranged at both ends of the excavation region 40, that is, on both sides of the bushing hole 25 in the longitudinal direction. The both end vertical plates 112 are configured to be shorter than the diameter of the bushing hole 25.

The corner side transverse plate 113 may be disposed in a space between the upper and lower transverse plates 111 and the longitudinal transverse plates 112, that is, at four corners of the excluded region 40 in the transverse direction.

In one embodiment, a plurality of corner side transverse plates 113 may be arranged in parallel so as to cover a space between the upper and lower transverse plates 111 and the transverse plates 112 at both ends.

In addition, as shown in FIG. 4, the corner side lateral plate 113 is preferably chamfered in an oblique or rounded shape so that an end opposite to the bushing hole 25 is prevented from concentrating the electric field.

5 is an eddy current loss distribution diagram of the enclosure 10 employing the supplementary magnetic shield plate 110 according to the first embodiment of the present invention shown in FIG.

5, the enclosure 10 employing the supplementary magnetic shield plate 110 according to the first embodiment has a bushing hole 25 compared with the enclosure 10 of the power transformer according to the prior art shown in FIG. 3, It can be seen that the area of the surrounding loss concentrated region is remarkably reduced.

≪ Example 2 >

6, in the second embodiment of the present invention, the supplementary magnetic shield plate 110 may include upper and lower end side plates 111, a both end side plates 112 and a corner side plate 114 .

The upper and lower end side plates 111 may be disposed in the upper and lower ends of the excavation region 40, that is, above and below the bushing holes 25 in the lateral direction.

For example, the upper and lower end side plates 111 may be configured to be shorter than the diameter of the bushing hole 25.

In addition, the both end vertical plates 112 may be arranged at both ends of the excavation region 40, that is, on both sides of the bushing hole 25 in the longitudinal direction. However, the present invention is not limited to such a structure. The longitudinal plate 112 may be longer than the bushing hole 25 and shorter than the lateral length of the excavation area 40.

The corner side vertical plate 114 may be arranged in the vertical direction at the four corners of the space between the upper and lower end side plates 111 and the both end vertical plates 112,

In one embodiment, a plurality of corner side vertical plates 114 may be arranged in parallel to cover the space between the upper and lower end side plates 111 and the both end vertical plates 112.

In addition, as shown in FIG. 6, the corner side vertical plate 114 is preferably chamfered in an oblique or rounded shape so that an end opposite to the bushing hole 25 is prevented from concentrating the electric field.

The supplementary magnetic shield plate 110 of the second embodiment may be configured such that the supplementary magnetic shield plate 110 of the first embodiment shown in FIG. 4 is rotated by 90 degrees.

7 is an eddy current loss distribution diagram of the enclosure 10 employing the supplementary magnetic shield plate 110 according to the second embodiment of the present invention shown in FIG.

7, the enclosure 10 employing the supplementary magnetic shield plate 110 according to the second embodiment has a bushing hole 25 compared with the enclosure 10 of the power transformer according to the prior art shown in Fig. 3, It can be seen that the area of the surrounding loss concentrated region is remarkably reduced.

≪ Example 3 >

8, the supplementary magnetic shield plate 110 includes upper and lower end side plates 111, a both end side plates 112, a corner side plate 114, and an overlap portion 115 ).

The upper and lower end side plates 111 may be disposed in the upper and lower ends of the excavation region 40, that is, above and below the bushing holes 25 in the lateral direction.

For example, the upper and lower end transverse plates 111 may be configured to be longer than the diameter of the bushing hole 25 and shorter than the transverse length of the excavation region 40.

In addition, the both end vertical plates 112 may be arranged at both ends of the excavation region 40, that is, on both sides of the bushing hole 25 in the longitudinal direction. The both end vertical plates 112 may be configured to be longer than the diameter of the bushing hole 25 and shorter than the lateral length of the excavation area 40.

In addition, the corner-side vertical plates 114 may be arranged long in the longitudinal direction at four corners of the excavation area 40.

In one embodiment, the corner side vertical plates 114 may be configured to cover a space surrounded by the rims of the upper and lower end transverse plates 111, the longitudinal transverse plates 112, and the bushing holes 25, have.

In addition, as shown in FIG. 8, it is preferable that the corner side vertical plate 114 is chamfered in an oblique or rounded shape so that an end opposite to the bushing hole 25 is prevented from concentrating the electric field.

The overlap portion 115 is a portion where a part of the upper and lower end side plates 111 and a part of the corner side plates 114 overlap each other.

That is, the overlapped portion 115 is formed by overlapping a portion of both ends of the upper and lower end side plates 111 and a portion of the upper end of the corner side plate 114 disposed on the upper side of the excavation region 40, And the lower ends of the corner-side vertical plates 114 disposed at the lower side of the exclusion zone 40 overlap with each other.

The overlapped portion 115 may be configured such that a part of the upper and lower end side plates 111 is inserted between the corner side plate 114 and the inner wall of the enclosure 10.

The structure in which the upper and lower end transverse plates 111 are elongated on both sides so that both ends are inserted between the corner side vertical plates 114 and the inner wall of the enclosure 10 has a structure in which magnetic flux is generated at the upper and lower ends of the bushing holes 25, Since the magnetic flux path that can smoothly move to the shielding plate 30 is provided, the eddy current loss of the enclosure 10 at the upper and lower end portions of the bushing hole 25 is remarkably reduced.

FIG. 9 is an eddy current loss distribution diagram of the enclosure 10 employing the supplementary magnetic shield plate 110 according to the third embodiment of the present invention shown in FIG.

9, the enclosure 10 employing the supplementary magnetic shield plate 110 according to the third embodiment is similar to the enclosure 10 of the power transformer according to the first and second embodiments shown in Figs. 5 and 7, The area of the loss concentration region around the bushing hole 25 is remarkably reduced.

As an experimental example, the power transformer according to the third embodiment, in the same manner as the power transformer according to the conventional technique described above with reference to FIG. 3, is operated at a temperature of the outside air temperature of 20 占 폚 and a temperature of the insulating oil inside the enclosure (10) The eddy current loss was reduced by about 40% as compared with the conventional power transformer shown in FIG. 3, and the maximum superheating point temperature in the exclusion region 40 was reduced by about 57 ° C to 132.9 ° C.

10 is an analysis chart showing the magnetic flux direction in the supplementary magnetic shield plate 110 included in the power transformer according to the third embodiment of the present invention.

10, the direction of magnetic flux of the supplementary magnetic-field shielding plate 110 is mostly coincident with the longitudinal direction of the supplementary magnetic-field shielding plate 110 except for a part of the area.

Therefore, in the embodiments of the present invention, it is preferable that the supplementary magnetic shield plate 110 is made of a directional material so that the magnetic flux can move more smoothly along the longitudinal direction of the supplementary magnetic shield plate 110.

Here, the directional material means an oriented silicon steel plate or an anisotropic silicon steel plate. This is a concept opposite to that of unstiffened silicon steel sheet, which is manufactured to match the rolling direction and the magnetic force line in manufacturing steel sheets in a steel company so that the flux can flow well in only one direction.

While the present invention has been particularly shown and described with reference to particular embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention as defined by the following claims I would like to make it clear.

10: enclosure 20: bushing housing
25: bushing hole 30: magnetic field shielding plate
40: Exclusion zone 110: Supplementary magnetic field shield plate
111: Upper and lower end side plate 112: Both end side plate
113: corner side lateral plate 114: corner side vertical plate
115:

Claims (6)

A bushing hole formed in the housing and coupled to a cylindrical bushing housing; a plurality of magnetic field shielding plates mounted on an inner wall of the housing to surround the bushing hole; and a magnetic shield plate disposed between the magnetic shield plate and the bushing hole And an excitation region in which the magnetic field shielding plate to be formed is excluded,
And a supplementary magnetic circuit shield plate provided to cover at least a part of the exclusion zone.
The method according to claim 1,
Wherein said supplementary magnetic shield plate is in the form of a straight bar and a plurality of said supplementary magnetic shield plates are mounted in said exclusion zone.
3. The method of claim 2,
The supplementary magnetic shield plate includes:
Upper and lower end horizontal plates arranged in a lengthwise direction at the upper and lower ends of the exclusion zone;
A both-end vertical plate disposed at both ends of the exclusion zone in a longitudinal direction; And
A plurality of corner-side transverse plates arranged in the space between the upper and lower-end transverse plates and the both-end transverse plates in the transverse direction;
≪ / RTI >
3. The method of claim 2,
The supplementary magnetic shield plate includes:
Upper and lower end horizontal plates arranged in a lengthwise direction at the upper and lower ends of the exclusion zone;
A both-end vertical plate disposed at both ends of the exclusion zone in a longitudinal direction; And
A plurality of corner-side vertical plates arranged in a longitudinal direction in a space between the upper and lower-end lateral plates and the both-end vertical plates;
≪ / RTI >
3. The method of claim 2,
The supplementary magnetic shield plate includes:
Upper and lower end horizontal plates arranged in a lengthwise direction at the upper and lower ends of the exclusion zone;
A both-end vertical plate disposed at both ends of the exclusion zone in a longitudinal direction;
A plurality of corner-side vertical plates arranged longitudinally in a corner portion of the exclusion zone; And
An overlapped portion in which a part of the upper and lower end transverse plates and a part of the corner side vertical plates overlap with each other;
≪ / RTI >
The method according to claim 1,
Wherein the supplementary magnetic shield plate is made of a directional material.
KR1020150091491A 2015-06-26 2015-06-26 Power transformer KR102018868B1 (en)

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KR1020150091491A KR102018868B1 (en) 2015-06-26 2015-06-26 Power transformer

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Application Number Priority Date Filing Date Title
KR1020150091491A KR102018868B1 (en) 2015-06-26 2015-06-26 Power transformer

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KR20170001907A true KR20170001907A (en) 2017-01-05
KR102018868B1 KR102018868B1 (en) 2019-09-09

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102149293B1 (en) * 2020-06-09 2020-08-28 산일전기 주식회사 Transformer
KR20200002175U (en) 2019-03-26 2020-10-07 현대중공업 주식회사 Cable tray
KR20210049571A (en) 2019-10-25 2021-05-06 삼성중공업 주식회사 Electric wiring support device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0970115A (en) * 1995-08-31 1997-03-11 Mitsubishi Electric Corp Bushing for transformer
JP2000277356A (en) * 1999-03-25 2000-10-06 Toshiba Corp Oil-immersed transformer
JP2001160516A (en) * 1999-12-03 2001-06-12 Hitachi Ltd Stationary induction apparatus
KR101229631B1 (en) * 2011-10-31 2013-02-04 김은희 Magnetic shield style transformer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0970115A (en) * 1995-08-31 1997-03-11 Mitsubishi Electric Corp Bushing for transformer
JP2000277356A (en) * 1999-03-25 2000-10-06 Toshiba Corp Oil-immersed transformer
JP2001160516A (en) * 1999-12-03 2001-06-12 Hitachi Ltd Stationary induction apparatus
KR101229631B1 (en) * 2011-10-31 2013-02-04 김은희 Magnetic shield style transformer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200002175U (en) 2019-03-26 2020-10-07 현대중공업 주식회사 Cable tray
KR20210049571A (en) 2019-10-25 2021-05-06 삼성중공업 주식회사 Electric wiring support device
KR102149293B1 (en) * 2020-06-09 2020-08-28 산일전기 주식회사 Transformer

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