|Publication number||US3909509 A|
|Publication date||Sep 30, 1975|
|Filing date||Apr 1, 1974|
|Priority date||Apr 1, 1974|
|Also published as||CA1011833A, CA1011833A1|
|Publication number||US 3909509 A, US 3909509A, US-A-3909509, US3909509 A, US3909509A|
|Inventors||Fisher John L|
|Original Assignee||Kuhlman Corp|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (5), Referenced by (3), Classifications (9)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent 1191 Fisher 1451 Sept. 30, 1975 BUSHING WELL ASSEMBLY JohnL Fisher, Lexington, Ky.
Kuhlinan Corporation, Troy, Mich.
Apr. 1, 1974 US. Cl. 174/152 R; 339/126 R; 339/157 R 1m. (:1. H01B 17/26; HOlR 21/00 Field of Search 174/11 BH, 18, 19, 74 R, 174/75 R, 75 1), 142, 152 R, 153 R, 167; 336/107; 339/94 A, 94 R, 126 R,129, 130 R, 130 c, 156 R, 157 R, 158, 159 R,160, 161, 162,198 c, 198 E References Cited UNITED STATES PATENTS 8/1918 Berg 339/159 R 9/1964 Goodman... 339/198 E X 12/1968 Howe 174/18 X 3,422,392 [/1969 Woods 174/152 R X 3,469,223 9/1969 Leonard 174/152 R X FOREIGN PATENTS OR APPLICATIONS 985,003 3/1965 United Kingdom 174/18 Primary ExaminerLaramie E. Askin Attorney, Agent, or Firm-Harness, Dickey & Pierce [5 7 ABSTRACT An integrated bushing well assembly for a transformer enclosure having a first conductor portion disposed on a first axis and extending interiorly of the transformer enclosure for connection to the transformer coil, at least two other conductor portions disposed on respective second and third axes and extending exteriorly of the transformer enclosure for connection to respective separable terminators, and an insulating housing for supporting the conductor portions with respect to the enclosure.
5 Claims, 7 Drawing Figures 2: nun-.11:
US. Patent Sept. 30,1975 Sheet 1 of 2 3,909,509
US. Patent Sept. 30,1975 Sheet20f2 3,909,509
BUSHING WELL ASSEMBLY BACKGROUND AND SUMMARY OF THE INVENTION The present invention relates to new constructions of bushing wells for transformer enclosures, and particularly, constructions which provide for feedthrough capability from one separable terminator to a second separable terminator. The bushing well constructions of the present invention reduce the space requirements for the bushing well and the separable terminator and reduce cantilever loading of the bushing well. One embodiment of a bushing well of the present invention includes a conductor arrangement having a first conductor portion which is disposed on a first axis and which extends interiorly of the transformer enclosure for connection to the transformer coil, and second and third conductor portions which extend exteriorly of the transformer enclosure and which are disposed on respective second and third axes which are nonintersecting with said first axis so that they may be skewed at two angles with respect to the first conductor portion. The conductor portions are generally surrounded by an insulating housing having three housing portions which are generally coaxial with respective ones of the three conductor portions. The housing portion associated with the first conductor portion extends into the transformer enclosure generally in the manner of conventional bushing wells while the housing portions associated with the second and third conductor portions are exterior of the transformer enclosure. A suitable shoulder or the like is provided to seal the opening for the bushing in the housing cooperatively with a gasket for that purpose.
A second embodiment of the present invention includes a conductor arrangement having a first conductor portion which is disposed on a first axis and which extends interiorly of the transformer enclosure for connection with the transformer coil, and second, third and fourth conductor portions which extend exteriorly of the transformer enclosure and which are disposed on respective axes which intersect at the axis of the first conductor portion. The four conductor portions are generally surrounded by and supported on the enclosure by a housing portion as described above.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a first elevational view of a first embodiment of a loop-feed bushing well according to the present invention;
FIG. 2 is a top elevational view of the loop-feed bushing well of FIG. 1;
' FIG. 3 is a second side elevational view of the loop- ;feed bushing well of FIG. I viewed in the direction of arrows 3-3;
FIG. 4 is a partially cross-sectioned view of the loopfeed bushing well of FIG. I viewed in the direction of arrows 44;
FIG. 5 is a cross-sectional view of the loop-feed bush- :ing well of FIG. I viewed in the direction of the arrows '5--5 in FIG. 2, shown in combination with an elbowtype insulated insulated terminator; 3 FIG. 6 is a side elevational view of a second embodiment of a loop-feed bushing well according to this invention; and
FIG. 7 is a top elevational view of the loop-feed bushing well of FIG. 6.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. l-S, a first embodiment of the bushing well 10 according to the present invention is illustrated. The bushing well 10 is mounted in an opening 12 in the wall 14 of a transformer enclosure. The bushing well 10 is clamped to the wall 14 by a U-shaped bracket 18 which straddles the bushing well 10. Ordinarily, the transformer enclosure 14 will contain oil so that a fluid-type seal between the bushing well 10 and the wall 14 is provided through the means of a gasket 16.
The bushing 10 has a conductor 20 with a first portion 22 which extends into the transformer enclosure along an axis 23 which is generally perpendicular to the plane of the wall 14. The first conductor portion 22 is provided with a threaded end inside of the enclosure for connection to a cable which in turn is connected to the transformer coil. The conductor 20 has a second conductor portion 24 which extends exteriorly of the transformer enclosure and which is generally aligned on an axis 26 which does not intersect the axis 23 of the first conductor portion 22. It should be noted that the axis 26, as shown in FIGS. 1 and 3, appears to intersect with the axis 23, but in actuality, axis 26 is offset from axis 23 as can be best seen in FIG. 2. In the projected view of axes 23 and 26 of FIG. 1, the axis 23 is seen to be disposed at an angle A, preferably 30, with respect to the axis 26. In the orthogonal projected view of those axes of FIG. 3, the axis 23 is seen to be at an angle B, preferably l2 /2, with respect to the axis 26.
The conductor 20 has a third conductor portion 28 which is exterior of the transformer enclosure and which is disposed on an axis 30 which is nonintersecting with the axis 23. The axis 30 is also disposed at an angle A, preferably 30, with respect to the axis 23 in the projected view of FIG. 1 and at an angle B, preferably l2 /2, in the orthogonal projected view of FIG. 3. The axes 26 and 30 are seen to be offset and parallel in the projected view of FIG. 2. A short fourth conductor portion 32 extends perpendicularly of the conductor portion 22 and connects the conductor portions 24 and 28.
In view of the above description of the conductor portions 22, 24 and 28, it will be appreciated that no two of the axes thereof lie in a common plane, and additionally, by means of the offset or non-intersecting nature of the second and third axes 26 and 30 relative to the first axis 23, the second and third axes 26 and 30 are definable by two angular measurements relative to the first axis 23. The above configuration may be contrasted with a planar Y configuration in which the axis of each leg of the Y lies in a common plane and in which each of the axes may be defined by a single angular measurement.
The loop-feed bushing assembly 10 has a housing 34 of insulating material which is preferably cast about the conductor 20. The housing 34 includes a generally circular first portion 36 which is slightly tapered toward the threaded end of the conductor portion 22 and is coaxial with the conductor portion 22, a second generally cylindrical portion 38 which is coaxial with respect to the conductor 24, and a third generally cylindrical portion 40 which is coaxial with respect to the third conductor portion 28. The second portion 38 and the third portion 40 smoothly merge each into the other as seen in the figures. The second housing portion 38 and the third housing portion 40 provide an annular shoulder 42 which is perpendicular to the axis 23 and which sealingly abuts the gasket 16.
As can be best seen in FIG. 5, the housing portion 38 has an inwardly-tapering coaxial bore 44 which terminates at a coaxial cylindrical projection 46. The conductor portion 24 has a threaded end which projects from the cylindrical projection 46 to permit its connection to an insulated separable connector insert to be described. The housing portion 40 has an inwardly tapering coaxial bore 48 which terminates at a coaxial cylindrical projection 50. The conductor portion 28 has a threaded end which projects from the cylindrical projection 50 to permit its connection to an insulated separable connector insert as will also be described.
The exterior of the housing 34 is preferably coated with an electrical coating so as to carry the ground potential at the wall 14 to the separable terminators.
With particular reference now to FIG. 5, the manner of connecting an insulated separable connector insert 52 to the exterior conductor portions 24, 28 is shown. The separable connector insert 52 has a central conductor with a threaded bore located in a coaxially extended cylindrical portion 56 which threads onto the threaded end of the conductor portion 24. The separable connector insert 52 has a resilient annular collar 58 which sealingly grips the external cylindrical surface of the housing portion 38. Insulated separable connector inserts, as shown at 52, are known in the art, and therefore, a detailed description thereof will not be provided. A separable elbow-type terminator 60 is secured to the separable connector insert 52 and provides an electrical connection therewith. Elbow-type terminators, as shown at 60, are also known in the art, and therefore, a detailed description thereof will not be provided.
In FIGS. 6 and 7 yet another embodiment of a bushing well assembly 70 according to the present invention is illustrated. The bushing well 70 of FIGS. 6 and 7 has three external taps to provide an accessory connection as well as a feedthrough connection. The bushing well 70 has a shoulder which is in sealed engagement with the wall 14 of a transformer enclosure through the means of the resilient gasket 16. The bushing well 70 has .a conductor assembly 72 including a first conductor portion 74 which extends into the transformer enclosure. The first conductor portion 74 is located on an axis 76 which extends perpendicularly with respect to the wall 14. The conductor assembly 72 further includes a second conductor portion 78 located on an axis 80, a third conductor portion 82 located on an axis 84, and a fourth conductor portion 86 located on an axis 88. Each of the conductor portions 78, 82 and 86 has threaded ends and extends exteriorly of the transformer enclosure for connection to separable terminators as described above. Each of the axes 80, 84 and 88 intersects with the axis 76 and is equidistantly disposed relative to each other, i.e., each being disposed at an angle of 120 relative to each other. Additionally, the Y tion 96 which is coaxial with the conductor portion 78, and a fourth generally cylindrical portion 98 which is coaxial with the conductor portion 86. Each of the housing portions 94, 96 and 98 has an inwardly taper-.
terminator assembly so that these bushing wells may be used with existing transformer enclosures which may have limited space for such assemblies. Furthermore, it will be appreciated that the bushing well constructions of the present invention advantageously minimize the cantilever stresses on the bushing well.
It is to be understood that the foregoing description is that of preferred embodiments of the invention. Various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.
What is claimed is:
1. For a transformer having an enclosure, a bushing well comprising a. conductor means having 1. a first conductor disposed on a first axis for connection to said transformer,
2. a second conductor disposed on a second axis for connection to a first terminator means and extending outwardly of said enclosure,
3. a third conductor disposed on a third axis for connection to a second terminator means and BX- tending outwardly of said enclosure,
4. a fourth conductor attached to said first conductor and being disposed between and connected to said second and third conductors,
5. said three axes being disposed so that they are non-intersecting and so that no plane may be defined which contains any two of said axes,
6. at least one of said second and third axes being inclined at two angles with respect to said first axiswith each of said two angles being defined in respective orthogonal projections, and
b. insulating means connected to said first, second,
third and fourth conductors for supporting said conductor means relative to said enclosure and for insulating said conductor means therefrom.
2. A bushing well according to claim 1 wherein said insulating means has first, second and third insulating means portions with each of said portions surrounding a respective one of said first, second and third conductors.
3. A bushing well according to claim 2 wherein said insulating means has shoulder means for cooperation with said enclosure for providing a fluid seal with said enclosure.
4. A bushing well according to claim 1 wherein said insulating means has a first portion surrounding said first conductor and second and third portions surrounding said second and third conductors with said second and third portions joining said first portion so as to define a shoulder for cooperation with said enclosure to provide a fluid seal with said enclosure.
5. A bushing well according to claim 1 wherein both gles being defined in respective orthogonal projections.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US1274844 *||Sep 29, 1917||Aug 6, 1918||Metal Specialties Mfg Company||Electric connector.|
|US3150230 *||Jan 31, 1963||Sep 22, 1964||Goodman Earl W||Transformer terminal mounting assembly|
|US3414868 *||May 10, 1967||Dec 3, 1968||Gen Electric||Terminator for connecting a plurality of electrical cables to a secondary of an electrical apparatus|
|US3422392 *||Jun 8, 1966||Jan 14, 1969||Westinghouse Electric Corp||Electrical bushing assembly|
|US3469223 *||Jun 26, 1968||Sep 23, 1969||Westinghouse Electric Corp||Cast bushing for connecting a high voltage and high current to electrical apparatus located in a metal casing or tank|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US4203641 *||Dec 18, 1978||May 20, 1980||Amerace Corporation||Double bushing insert|
|US4573757 *||Mar 1, 1985||Mar 4, 1986||Kuhlman Corporation||Transformer bushing|
|US4611093 *||Jan 20, 1984||Sep 9, 1986||Colt Industries Operating Corp||Electrical bushing having a replaceable stud|
|U.S. Classification||174/152.00R, 439/564|
|International Classification||H01F27/02, H01F27/04, H01B17/26|
|Cooperative Classification||H01F27/04, H01B17/26|
|European Classification||H01F27/04, H01B17/26|