WO2013170874A1 - Multiple terminals bushing assembly - Google Patents

Multiple terminals bushing assembly Download PDF

Info

Publication number
WO2013170874A1
WO2013170874A1 PCT/EP2012/058885 EP2012058885W WO2013170874A1 WO 2013170874 A1 WO2013170874 A1 WO 2013170874A1 EP 2012058885 W EP2012058885 W EP 2012058885W WO 2013170874 A1 WO2013170874 A1 WO 2013170874A1
Authority
WO
WIPO (PCT)
Prior art keywords
bushing assembly
bushing
press plates
bolts
transformer
Prior art date
Application number
PCT/EP2012/058885
Other languages
French (fr)
Inventor
Antal Olah
Zsolt SUKOSD
Original Assignee
Siemens Aktiengesellschaft
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 Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to HUE12721278A priority Critical patent/HUE028854T2/en
Priority to EP12721278.5A priority patent/EP2850623B1/en
Priority to PL12721278T priority patent/PL2850623T3/en
Priority to PCT/EP2012/058885 priority patent/WO2013170874A1/en
Publication of WO2013170874A1 publication Critical patent/WO2013170874A1/en

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

  • the present invention relates to a multiple terminals bushing assembly for electrical transformer.
  • Electrical transformers are used to distribute electricity from the point of generation or substations for domestic home or business and thereby stepping down the voltage.
  • Transformers require insulative conductors on both the high and low voltage sides.
  • the transformer case or tank is usually metal and must be safely insulated.
  • a bushing is a hollow isolator, carrying high and low voltage leads through a wall portion of the tank.
  • Low voltage bushings of tank-type transformers are generally made up of molded epoxy bushing or multi-piece assemblies with porcelain isolators. Mounting space of a bushing assembly is restricted by outer dimensions, creepage distance and clearance distance between the terminals.
  • transformers especially distribution transformers
  • the tank is hermetically sealed by placing a sealing gasket between the top portion, usually a flat cover, and a pot-shaped casing portion.
  • the bushing compartment comprises
  • a multiple terminals bushing assembly for an electrical transformer comprising:
  • an insulating support comprising:
  • each of the press plates having corresponding openings which are adapted for connector elements passing through the openings; a ring-shaped gasket arranged in each opening and in contact with each of the press plates and the curved surface area of a corresponding connector element ; a clamping arrangement for squeezing the gasket.
  • the bushing assembly according to the invention has two press plates which serve as an insulation support for the connector elements.
  • the space required for large amount of bushings is reduced. Susceptibility to variations and
  • the ring-shaped gasket is arranged in a ring- shaped recess provided in at least one of the press plates and serve as a seal to prevent fluid leakage around the connector elements.
  • the clamping arrangement comprises a first set of bolts to hold together the press plates during the pre-assembly of the transformer's active part.
  • the first set of bolts are arranged in counterbored holes provided in the upper press plate averted form the
  • transformer casing to leave clearance between the bolt head and clamping frame and screwed in threaded blind holes in the lower press plate to prevent the fluid flow through the hole.
  • the clamping arrangement further comprises a clamping frame and second set of bolts, whereby the pair of press plates is sandwiched between the clamping frame and the transformer casing .
  • a sealing plate is arranged between the transformer casing and the opposing press plate.
  • the second set of bolts to be introduced form the exterior of the transformer casing in order to pull the clamping frame towards the tank and squeeze the sealing gaskets around the connector elements.
  • the second bolts are flange-type bolts and sealing between the tank wall and the bolt is accomplished by a gasket, whereby a washer limits the squeezing of the gasket.
  • each of the connector elements is coated with a sealant compound.
  • Fig. la is a front view of a terminal assembly of an
  • Fig. lb is a top view of Fig la;
  • Fig. 2 is an enlarged view of two different type of
  • Fig. 3 is an in enlarged view according to section "A-A and "B-B" in Fig. lb;
  • Fig. 4 top view of a steel clamping frame
  • Fig. 5 is a top view of a sealing plate
  • Fig. 6 is an enlarged front view of "Detail X" in Fig la;
  • Fig. 7 is a partial sectional drawing of a front view of an application of the invention, whereby the low voltage bushing assembly is mounted on a bushing compartment which is attached on the side wall of a transformer tank;
  • Fig. 8 is a side view of Fig 7.
  • Fig. la shows a front view of bushing assembly 1 of a tank- type electrical transformer having multiple low voltage bushings per phase.
  • the transformer tank 6 has an opening 15.
  • the bushing assembly 1 is arranged in this opening 15.
  • the bushing assembly 1 comprises multiple connector elements 2, 21 made of conductive material.
  • the connector elements 2,21 are adapted for connection of electrical conductors.
  • the bushing assembly 1 further comprises one upper and one lower machined press plates 3, 4. Both press plates 3, 4 are closely spaced and made of an insulation material. Each press plate 3, 4 show through holes 12 (Fig. 3) for guiding the connector elements 2, 21 between the exterior 18 and the interior 19 of the transformer tank 6.
  • the press plates 3, 4 are sandwiched between a clamping frame 5 (Fig. 4) and the transformer tank 6.
  • a sealing plate 8 is sandwiched between a clamping frame 5 (Fig. 4) and the transformer tank 6.
  • FIG. 5 is located between the lower press plate 4 and the tank 6.
  • the clamping frame 5 and the sealing plate 8 have openings 22, 23.
  • Fig. lb shows a top view of the bushing assembly 1.
  • Each phase comprises six connector elements 2 and one connector element 21.
  • the connector elements 2,21 of each phase arranged in the openings 22, 23 of the clamping frame 5 and sealing plate 8 (three rows, with two connector elements in each row) .
  • Fig. 2b shows two connector element types made of conductive material used for different ampacities.
  • the electrical conductor is inserted into the ending of the tubular part of the connector element and electrically connected using crimp connection .
  • FIG. 3 shows partially in section the area around the through holes in the upper press plate and countersunk holes in the lower press plate 12 according to lines A-A and B-B in Figure 2.
  • the clamping arrangement comprises first bolts 17 to pull together plates 3 and 4.
  • the upper press plate has counterbored holes 10 for the head of bolt 17.
  • the lower press plate 4 has threaded blind holes 11. With the bolts 17 the press plates 3, 4 are compressed and held in a closely spaced position. Fluid leakage is prevented by the sealing gaskets 7, which are provided in countersunk holes 16 in the lower plate 4, squeezed by pulling the plates 3, 4 together and by a sealing plate 8 between the
  • each of the connector elements 2, 21 is coated with a sealant compound.
  • Retaining rings 20 are inserted in the groove on connector element 2 to prevent the slip out from the press plates.
  • the final clamping is furnished by compressing the sealing gaskets 7 between the press plates 3, 4 around the connector elements with the steel clamping frame 5.
  • the clamping bolts 13 are introduced from the outer side (exterior 18) . This facilitates the assembly process.
  • an o-ring 9 (Fig. 6) is placed between the flanged clamping bolt and the washer 14 (Fig. 6) .
  • FIG. 8 show the bushing assembly 1 according to the invention located on the bottom part of a bushing compartment 24.
  • the bushing compartment 24 is attached to a side wall 25 of a transformer tank. This design allows the arrangement of bushings in two levels: the high voltage side on the top of the transformer, the low voltage multiple terminals on the bottom portion 26 of a separate bushing compartment 24.
  • the two-level construction of a bushing assembly opens the possibility for arrangement of further connection means required in high current applications. Electrical terminals 2, 21 facing downwardly from the bottom portion 26 of the bushing compartment 24 are protected in a niche.
  • the invention provides sufficient space for electrical connection required in additional high current applications.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Housings And Mounting Of Transformers (AREA)

Abstract

Multiple terminals bushing assembly for an electrical transformer, comprising: • an insulating support, comprising: • a pair of closely spaced press plates (3, 4) made of an insulating material and arranged in an opening of the transformer casing (6), whereby each of the press plates having corresponding openings (12) which are adapted for connector (2, 21) elements passing through the openings; • a ring-shaped gasket (7) arranged in each opening and in contact with each of the press plates and the curved surface area of a corresponding connector element; • a clamping arrangement (17) for squeezing the gasket.

Description

Description
Multiple terminals bushing assembly
Field of the Invention
The present invention relates to a multiple terminals bushing assembly for electrical transformer.
Background of the Invention
Electrical transformers are used to distribute electricity from the point of generation or substations for domestic home or business and thereby stepping down the voltage.
Transformers require insulative conductors on both the high and low voltage sides. The transformer case or tank is usually metal and must be safely insulated. A bushing is a hollow isolator, carrying high and low voltage leads through a wall portion of the tank.
Low voltage bushings of tank-type transformers are generally made up of molded epoxy bushing or multi-piece assemblies with porcelain isolators. Mounting space of a bushing assembly is restricted by outer dimensions, creepage distance and clearance distance between the terminals.
Traditionally, the bushing compartment of electrical
transformers, especially distribution transformers, is arranged on the top portion of the transformer tank. The tank is hermetically sealed by placing a sealing gasket between the top portion, usually a flat cover, and a pot-shaped casing portion. The bushing compartment comprises
electrically insulated conductors extending through an opening of the tank and having substantial vertical oriented outer terminals. Electrical connection of the terminals is easily possible with the bushing compartment arranged on the top of the tank.
However, in applications where additional high current connection is required the available space on the top portion of the tank is limiting factor. The required space for multiple bushings per phase will increase the outer
dimensions of the transformer. It is common practice to place the bushings on the cover of the transformer in single or multiple rows making the connection to the control unit grid difficult. A further disadvantage is, that such an low voltage bushing arrangement is not easy to adapt on various modifications for specific applications. Thus, it would be desirable to provide a multiple terminals bushing assembly which requires less mounting space and which is easy to adept on specific applications.
Summary of the Invention
Against the foregoing background, it is an object of the present invention to provide a multi terminals bushing assembly with small overall installed size.
In accordance with the present invention there is provided a multiple terminals bushing assembly for an electrical transformer, comprising:
an insulating support, comprising:
a pair of closely spaced press plates made of an insulating material and arranged in an opening of the transformer casing, whereby each of the press plates having corresponding openings which are adapted for connector elements passing through the openings; a ring-shaped gasket arranged in each opening and in contact with each of the press plates and the curved surface area of a corresponding connector element ; a clamping arrangement for squeezing the gasket.
In other words, the bushing assembly according to the invention has two press plates which serve as an insulation support for the connector elements. In comparison to epoxy molded bushings the space required for large amount of bushings is reduced. Susceptibility to variations and
modifications for specific applications e.g. simple
implementation of additional connector elements and easy rearrangement for specific applications, various connector elements having different cross-sections and shapes
implemented in one bushing assembly. Low cost is achieved by the unsophisticated machining and assembly technology and by the availability of the raw materials on the market.
Preferably the ring-shaped gasket is arranged in a ring- shaped recess provided in at least one of the press plates and serve as a seal to prevent fluid leakage around the connector elements.
In a preferred embodiment the clamping arrangement comprises a first set of bolts to hold together the press plates during the pre-assembly of the transformer's active part.
The first set of bolts are arranged in counterbored holes provided in the upper press plate averted form the
transformer casing to leave clearance between the bolt head and clamping frame and screwed in threaded blind holes in the lower press plate to prevent the fluid flow through the hole.
In order to distribute the clamping force uniformly the clamping arrangement further comprises a clamping frame and second set of bolts, whereby the pair of press plates is sandwiched between the clamping frame and the transformer casing . For leakage-free mounting, a sealing plate is arranged between the transformer casing and the opposing press plate.
For the assembling process it is desirable that the second set of bolts to be introduced form the exterior of the transformer casing in order to pull the clamping frame towards the tank and squeeze the sealing gaskets around the connector elements.
In a preferred embodiment the second bolts are flange-type bolts and sealing between the tank wall and the bolt is accomplished by a gasket, whereby a washer limits the squeezing of the gasket.
Preferably the curved surface area of each of the connector elements is coated with a sealant compound.
Brief Description of the Drawings
In the accompanying drawing,
Fig. la is a front view of a terminal assembly of an
electrical transformer having multiple low voltage bushings per phase;
Fig. lb is a top view of Fig la;
Fig. 2 is an enlarged view of two different type of
connector elements;
Fig. 3 is an in enlarged view according to section "A-A and "B-B" in Fig. lb;
Fig. 4 top view of a steel clamping frame; Fig. 5 is a top view of a sealing plate;
Fig. 6 is an enlarged front view of "Detail X" in Fig la;
Fig. 7 is a partial sectional drawing of a front view of an application of the invention, whereby the low voltage bushing assembly is mounted on a bushing compartment which is attached on the side wall of a transformer tank;
Fig. 8 is a side view of Fig 7.
Detailed Description of Preferred Embodiments
Fig. la shows a front view of bushing assembly 1 of a tank- type electrical transformer having multiple low voltage bushings per phase. The transformer tank 6 has an opening 15. The bushing assembly 1 is arranged in this opening 15.
The bushing assembly 1 comprises multiple connector elements 2, 21 made of conductive material. The connector elements 2,21 are adapted for connection of electrical conductors.
The bushing assembly 1 further comprises one upper and one lower machined press plates 3, 4. Both press plates 3, 4 are closely spaced and made of an insulation material. Each press plate 3, 4 show through holes 12 (Fig. 3) for guiding the connector elements 2, 21 between the exterior 18 and the interior 19 of the transformer tank 6.
The press plates 3, 4 are sandwiched between a clamping frame 5 (Fig. 4) and the transformer tank 6. A sealing plate 8
(Fig. 5) is located between the lower press plate 4 and the tank 6. The clamping frame 5 and the sealing plate 8 have openings 22, 23. Fig. lb shows a top view of the bushing assembly 1. Each phase comprises six connector elements 2 and one connector element 21. The connector elements 2,21 of each phase arranged in the openings 22, 23 of the clamping frame 5 and sealing plate 8 (three rows, with two connector elements in each row) .
Fig. 2b shows two connector element types made of conductive material used for different ampacities. The electrical conductor is inserted into the ending of the tubular part of the connector element and electrically connected using crimp connection .
The clamping arrangement my bee more clearly understood with reference to Figure 3. Figure 3 shows partially in section the area around the through holes in the upper press plate and countersunk holes in the lower press plate 12 according to lines A-A and B-B in Figure 2. The clamping arrangement comprises first bolts 17 to pull together plates 3 and 4. The upper press plate has counterbored holes 10 for the head of bolt 17. The lower press plate 4 has threaded blind holes 11. With the bolts 17 the press plates 3, 4 are compressed and held in a closely spaced position. Fluid leakage is prevented by the sealing gaskets 7, which are provided in countersunk holes 16 in the lower plate 4, squeezed by pulling the plates 3, 4 together and by a sealing plate 8 between the
transformer tank 6 and the lower plate 4. Furthermore, the curved surface area of each of the connector elements 2, 21 is coated with a sealant compound. Retaining rings 20 are inserted in the groove on connector element 2 to prevent the slip out from the press plates. The final clamping is furnished by compressing the sealing gaskets 7 between the press plates 3, 4 around the connector elements with the steel clamping frame 5. The clamping bolts 13 are introduced from the outer side (exterior 18) . This facilitates the assembly process. To prevent fluid leakage through the clamping bolts 13, an o-ring 9 (Fig. 6) is placed between the flanged clamping bolt and the washer 14 (Fig. 6) . Fig. 7 and Fig. 8 show the bushing assembly 1 according to the invention located on the bottom part of a bushing compartment 24. The bushing compartment 24 is attached to a side wall 25 of a transformer tank. This design allows the arrangement of bushings in two levels: the high voltage side on the top of the transformer, the low voltage multiple terminals on the bottom portion 26 of a separate bushing compartment 24.
The two-level construction of a bushing assembly opens the possibility for arrangement of further connection means required in high current applications. Electrical terminals 2, 21 facing downwardly from the bottom portion 26 of the bushing compartment 24 are protected in a niche. The invention provides sufficient space for electrical connection required in additional high current applications.
The foregoing merely illustrates the principal of the invention. Those skilled in the art will be able to diverse numerous arrangements which, although not explicitly
described or shown herein, embody those principles and are within the scope of the invention.
List of used reference signs
1 bushing assembly
2 connector element
3 upper press plate
4 lower press plate
5 clamping frame
6 transformer tank
7 sealing gasket
8 sealing plate
9 O-Ring
10 counterbored hole
11 threaded blind hole
12 through hole
13 flanged clamping bolt
14 washer
15 opening in 6
16 countersunk holes
17 bolt
18 exterior
19 interior
20 retaining rings
21 connector element
22 opening in 5
23 opening in 8
24 bushing compartment
25 side wall of transformer tank
26 bottom portion of 24

Claims

Claims
1. Multiple terminals bushing assembly for an electrical transformer, comprising:
an insulating support, comprising:
a pair of closely spaced press plates made of an insulating material and arranged in an opening of the transformer casing, whereby each of the press plates having corresponding openings which are adapted for connector elements passing through the openings;
a ring-shaped gasket arranged in each opening and in contact with each of the press plates and the curved surface area of a corresponding connector element;
a clamping arrangement for squeezing the gasket.
. Bushing assembly as claimed in Claim 1, wherein the ring-shaped gasket is arranged in a ring-shaped recess, which is provided in at least one of the press plates.
Bushing assembly as claimed in Claim 1 or 2, wherein the clamping arrangement comprises first bolts to compress the press plates.
Bushing assembly as claimed in Claim 3, wherein the first bolts are arranged in counterbored holes provided in the press plate averted form the transformer casing.
. Bushing assembly as claimed in Claim 3 or 4, wherein the clamping arrangement further comprises a clamping frame and second bolts, whereby the pair of press plates is sandwiched between the clamping frame and the transformer casing.
6. Bushing assembly as claimed in Claim 1, wherein a sealing plate is arranged between the transformer casing and the opposing press plate.
7. Bushing assembly as claimed in Claim 5, wherein the
second bolts are introduced form the exterior of the transformer casing.
8. Bushing assembly as claimed in Claim 7, wherein the
second bolts are flange-type bolts and sealing is accomplished by a gasket, whereby a washer limits the squeezing of the gasket.
9. Bushing assembly as claimed in Claim 1, wherein the curved surface area of each of the connector elements
2, 21 is coated with a sealant compound.
10. Bushing assembly as claimed in Claim 2, wherein the clamping frame is made of steel.
11. Bushing assembly according to Claim 1, used as low voltage multiple terminals bushing assembly.
12. Electrical Transformer, comprising:
a tank having a side wall;
a bushing compartment attached to the side wall, whereby the bushing compartment having a bottom portion with an opening;
a bushing assembly according to one of the Claims 1 to 10 leak-proof mounted in the opening .
PCT/EP2012/058885 2012-05-14 2012-05-14 Multiple terminals bushing assembly WO2013170874A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
HUE12721278A HUE028854T2 (en) 2012-05-14 2012-05-14 Multiple terminals bushing assembly
EP12721278.5A EP2850623B1 (en) 2012-05-14 2012-05-14 Multiple terminals bushing assembly
PL12721278T PL2850623T3 (en) 2012-05-14 2012-05-14 Multiple terminals bushing assembly
PCT/EP2012/058885 WO2013170874A1 (en) 2012-05-14 2012-05-14 Multiple terminals bushing assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2012/058885 WO2013170874A1 (en) 2012-05-14 2012-05-14 Multiple terminals bushing assembly

Publications (1)

Publication Number Publication Date
WO2013170874A1 true WO2013170874A1 (en) 2013-11-21

Family

ID=46085617

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/058885 WO2013170874A1 (en) 2012-05-14 2012-05-14 Multiple terminals bushing assembly

Country Status (4)

Country Link
EP (1) EP2850623B1 (en)
HU (1) HUE028854T2 (en)
PL (1) PL2850623T3 (en)
WO (1) WO2013170874A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107796964A (en) * 2017-11-29 2018-03-13 国家电网公司 A kind of current transformer tests aid
DE102018204350A1 (en) 2018-03-21 2019-09-26 Siemens Aktiengesellschaft Arrangement for carrying out a plurality of electrical connections through a wall of an electrical transformer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110060839B (en) * 2019-05-22 2020-09-04 闽江学院 Transformer mounting structure

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB749848A (en) * 1953-07-30 1956-06-06 Ferranti Ltd Improvements relating to electrical terminal chambers
GB788219A (en) * 1955-06-27 1957-12-23 Gen Electric Electric bar lead seals
FR1289637A (en) * 1961-02-24 1962-04-06 Le Transformateur Sealing device for low voltage bushings of transformers immersed in an insulating liquid
EP0037367A1 (en) * 1980-03-27 1981-10-07 Siemens Aktiengesellschaft Gas or liquid insulated measuring transformer
FR2633439A1 (en) * 1988-06-22 1989-12-29 Alsthom Bar run for electric transformer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB749848A (en) * 1953-07-30 1956-06-06 Ferranti Ltd Improvements relating to electrical terminal chambers
GB788219A (en) * 1955-06-27 1957-12-23 Gen Electric Electric bar lead seals
FR1289637A (en) * 1961-02-24 1962-04-06 Le Transformateur Sealing device for low voltage bushings of transformers immersed in an insulating liquid
EP0037367A1 (en) * 1980-03-27 1981-10-07 Siemens Aktiengesellschaft Gas or liquid insulated measuring transformer
FR2633439A1 (en) * 1988-06-22 1989-12-29 Alsthom Bar run for electric transformer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107796964A (en) * 2017-11-29 2018-03-13 国家电网公司 A kind of current transformer tests aid
CN107796964B (en) * 2017-11-29 2020-03-27 国家电网公司 Current transformer experiment appurtenance
DE102018204350A1 (en) 2018-03-21 2019-09-26 Siemens Aktiengesellschaft Arrangement for carrying out a plurality of electrical connections through a wall of an electrical transformer

Also Published As

Publication number Publication date
EP2850623B1 (en) 2016-06-29
HUE028854T2 (en) 2017-01-30
EP2850623A1 (en) 2015-03-25
PL2850623T3 (en) 2017-05-31

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