AU611965B2

AU611965B2 - Electrical transformer component mounting assembly

Info

Publication number: AU611965B2
Application number: AU24976/88A
Authority: AU
Inventors: William James Book
Original assignee: Asea Brown Boveri Inc Canada
Current assignee: ASEA BROWN BOVERI Inc
Priority date: 1987-11-27
Filing date: 1988-11-09
Publication date: 1991-06-27
Anticipated expiration: 2008-11-09
Also published as: EP0318322A1; NO885272L; JPH0189714U; AU2497688A; NO885272D0

Description

4 AUSTRALIA Form PATENTS ACT 1952 COMPLETE SPECIFICATION

(ORIGINAL)

FOR OFFICE USE Short Titia: Int. Cl: Application Number: Lodged: *O 0 6 64) 0606" 44 4 0 66 0 00r 6o 0 0 4 00a 4~ 6Jb4 a666 0*~t Complete Specification-Lodged: Accepted: Lapsed: Published: Priority: 27th November, 1987 Related Art: *6r Name of Applicant: Address of Applicant; Actual Inventor: Address for Service: TO BE COMPLETED BY APPLICANT WES-TINGHOUSE E4LEC'IRIC GORPORATPION AGEA Bth'lc- ov t -1-3g0-Be1-dh-Road, Awe ca 9, we oma, "huar-oeh4i----, P-ittsburgh -PA- -1-52-3 a UN--ED--STATES O- AMRIC-A WILLIAM JAMES BOOK HALFORD MAXWELL Macarthur Mews, 6E Villiers Street, NORTH PARRAMATTA. N.S.W. 2151 Complete Specification for the invention entitled: "ELECTRICAL TRANSFORMER COMPONENT MOUNTING ASSEMBLY" The following statement Is a full description of this Invention, including the best method of performing it known to trs us:- Notes: The description is to be typed in double spacing, pica type face, in an area not exceeding 250 mm In depth and 160 mm Ih width, on tough white paper of good quality and it is to be lirserted Inside this form, 14599/78-L Printed by CJ.TIOMONH, Commonwealth Government PrintetCanbert -laf t I 0 0 This invention relates to an electrical transformer structure and, more particularly, to a three-phase electrical tr'ansformer coil and core assembly having transformer components mounted thereon.

Electrical distribution transformer components are mounted within a tank where they are commonly cooled with an insulating or cooling dielectric fluid such as mineral oil.

In the past transformer components, such as tap changers., fuses, and circuit breakers, have been mounted within the tank and normally on the inner surface of the tank wall such as show.,n in U.S. Patent No. 4,504,811. A disadvantage of such mounting locations has been the necessity of mounting the component after the transformer core-coil assembly has been lowered into the tank, or dismounting the components prior to removing the transformer core-coil assembly from the tank.

4 It is a principal object of this inventi~on to provide an electrical distribution transformer assembly wherein the auxiliary electrical componentr are directly mounted to the core-coil assembly through an insulating mounting board to provide a unitary structure within the transformer tank.

According to the invention there Is provided an electrical d~.stribution transformer assembly comprising: a tank hiaving opposite sidewalls, opposite end walls, a bottom wall, and an access opening at the top end of said tank; a transformer core winding assembly, including end frame members, a bottom frame mfmber, and a top frame member

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I I 1 -2supporting and securing a plurality of coils and at least one core, said transformer core winding assembly being movable into and out of said tank through said access opening; a planar insulating component mounting board, including a plurality of pre-punched holes therethrough and constructed and arranged to accommodate a variety of component combinations thereon, mounted to and spaced from said top frame member between said core winding assembly and said access opening; 10 a plurality of transformer components mounted to the surface of said component mounting board remote from said core winding assembly adjacent said access opening; and a plurality of insulating spacers disposed between said 4 a insulating mounting board and said upper frame member, whereby said transformer components are readily accessible a through said access opening and are positioned such as not to impede the removal of said transformer core winding assembly sa* s fIom said tank.

The advantages of the structure of this invention enables significant reductions in the tank height because the components are installed in an area currently not utilized and thereby enables the use of less cooling dielectric fluid.

The structure also enables the assembly of the transformer components at reduced labor costs outside the tank assembly and before placement of the assembly into the tank.

The single view of the drawing is a pictorial view of a transformer partially cut away and partially exploded and i i "C -2awhich is constructed according to the teachings of the invention.

In the drawing a transformer construction is generally indicated at 1 and it comprises a transformer tank 3 and a transformer structure generally indicated at 5. The tank 3 is preferably of rectangular construction having opposite side walls 7, 9, opposite end walls 11, 13, a bottom wall and a top access opening 17 which is normally covered with a top cover (not shown). The tank is normally filled to a o? ,10 level 19 with a liquid insulating and cooling medium or dielectric, such as mineral oil. The transformer structure is preferably a three-phase magnetic core winding assembly including coils 21 and cores 23 associated in a conventional manner.

The magnetic core winding assembly is mounted within a frame having opposite end frame members 25, 27, a

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bottom frame member 29, and a top frame member 31, whereby the core-winding assembly is secured intact. The magnetic core winding assembly together with the mounting frame is immersed in the liquid dielectric which circulates within the tank and through openings 33 into and through a heat exchanger or cooler 35 which is mounted on each end wall 11, 13.

In accordance with this invention, a plurality of combinations of components for a distribution transformer are preferably mounted on a planar insulating mounting board 37. Such components may include fuses 39, a tap changer 41, and a' circuit breaker 43, The insulating mounting board 37 is preferably comprised of a dielectric 1 material, such as micarta or press board. The board 37 15 includes a plurality of pre-punched holes 45 to accept all known combinations of lead wires or conductors extending Sbetween the several components 39, 41, 43, and the transformer structure a i The mounting board 37 is attached to the top frame member 31 by means of suitable fasteners, such as screws (not shown), which extend through aligned holes 47, 49 in the board 37 and top frame member 31. Sufficient «o adielectric clearance is provided between the mounting board 37 and the top frame member 31 by the use of insulating 25 spacers 50 which are held in place by the same fasteners which attach the mounting board 37 to the top frame member 41. Although the insulating mounting board 37 may be j mounted and dismounted separately from the top frame member a 31, it is preferably mounted in place before the transformer structure 5 is placed within the tank 3.

Because the several components 39, 41, 43 are mounted on top of the transformer structure 5 and in a space between the top frame member 31 and the access opening 17, the overall size of the transformer tank 3 may be reduced to smaller dimensions without the provision of clearance for the components which are otherwise normally mounted on one or more of the tank walls 7-13.

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-4- Accordingly, the assembly of the transformer structure and insulating mounting board with the several transformer components is conveniently installed and/or removed from the tank with a minimum of effort.

In conclusion, the advantages of the transformer construction of this invention includes installation of the 0 00 components in an area which is currently underutilized. The *0 transformer construction also enables assembly of the 0"10 components in place outside of the tank thus reducing labor a 0" 9 costs. Moreover, there is a reduction in the number of parts 0 used and a facilitation of easy replacement of defective components 0 0 0 4000,1 0+ o 00 0 *00 0t9 0000C 4I 0 00~ 0 A 'l,

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Claims

1. An electrical distribution transformer assembly comprising: a tank having opposite sidewalls, opposite end walls, a bottom wall, and an access opening at the top end of said a tank; 4i o a o a transformer core winding assembly, including end frame members, a bottom frame member, and a top frame member a supporting and securing a plurality of coils and at least one core, said transformer core winding assembly being movable into and out of said tank through said access opening; a planar insulating component mounting board, including a a a plurality of pre-punched holes therethrough and constructed and arranged to accommodate a variety of component combinations thereon, mounted to and spaced from said top frame member between said core winding assembly and said a access opening; a plurality of transformer components mounted to the surface of said component mounting board remote from said core winding assembly adjacent said access opening; and a plurality of insulating spacers disposed between said insulating mounting board and said upper frame member, whereby said transformer components are readily accessible through said access opening and are positioned such as not to impede the removal of said transformer core winding assembly from said tank. I -6-

2. An electrical distribution transformer assembly according to claim 1 wherein said transformer components include fuses, a tap changer and a circuit breaker.

3. An electrical distribution transformer assembly substantially as hereinbefore described with reference to the accompanying drawings. DATED this 27th day of March, 1991 l r AEA BROWN BOVERI, INC. by their Patent Attorneys PETER MAXWELL ASSOCIATES B 1o o i 'A