FORM 2
THE PATENTS ACT, 1970
(39 of 1970) As amended by the Patents (Amendment) Act, 2005
AND
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2005
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION
A Fixing Assembly For Secure Transportation.
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTORS
Joshi Aditya Bhalchandra and Manish Madhukar Vanage of Crompton Greaves Limited, Design Department, Transformer (Tl) Division, Kanjur (East), Mumbai -400042, Maharashtra, India, Both Indian Nationals
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the nature of this invention and the manner in which it is to be performed:

TECHNICAL FIELD OF THE INVENTION:
This invention relates to the field of mechanical engineering. Particularly, this invention relates to an assembly for locating a core coil assembly in an enclosure for secure transportation.
BACKGROUND OF THE INVENTION:
A (power) transformer is an electrical device that transfers energy from one circuit to another by magnetic coupling without any moving parts. The basic working parts of a transformer are a core made of laminations/magnetic material, a primary winding, and a secondary winding.
The coil or windings are typically made from copper conductors. There is provided a metallic enclosure to protect assembly of these cores and coils. It also comprises the necessary components such as bushings to take lead out from winding to the outside of metallic enclosure and oil for cooling the copper windings etc.
In power transformers, the size of whole assembly is large to such an extent that the 'whole' assembly cannot be transported by road. Hence to ease transport, transformer assembly is normally disassembled and main unit comprising of core and coil assembly enclosed in tank is transported alone and other accessories are transported loose. While transporting, transformer experiences jerks and shocks due to irregularities of the road. If the core coil assembly is not located and fastened with transformer tank, then there will be relative movement between tank and core coil assembly and this may result in damage of the transformer.
PRIOR ART:
To avoid damages to the transformer during transport there are various methods of locating core coil assembly (CCA) with metallic enclosure (tank). The methods which are used for locating are described below.

According to a first prior art embodiment, a locating post is welded on to the CCA, for stability during transportation. This assembly is seen in Figures la and lb of the accompanying drawings.
Reference numeral 1 is a transformer winding wound on the laminated cores. The shown transformer is a 3 phase transformer; hence 3 coils or windings are seen. There are frames as shown as reference numeral 2 at top and at bottom of the 3 windings to clamp them together. Top stay depicted by reference numeral 3 (without locating post (5) welded on it) and reference numeral 4 (with locating post (5) welded on it) are used to keep both sides of the frame together. Reference numeral 5 is a locating post which is welded on extreme top stays. The assembly of core, winding, frame top stays and other necessary components is called as Core coil assembly. When CCA is completely manufactured it is lifted with crane and placed in tank depicted by reference numeral 10. Then the tank cover depicted by reference numeral 9 is lowered on the tank. Locating posts depicted by reference numeral 5 protrude through the hole on cover inside locating box assembly. There is free space between locating posts (5) and a locating box assembly welded to tank cover depicted by reference numeral 6 which is filled with special quality transformer wood (8). When transformer experiences shock or jerk during transport the force acted upon the CCA is transferred to the tank cover (9) and then to tank (10) through wood (8) and locating box assembly (6). And hence, the CCA remains safe during transport.
According to a second prior art embodiment, a locating post is welded on to the cover of the enclosure encompassing the CCA, for stability during transportation. This assembly is seen in Figures 2a and 2b of the accompanying drawings.
Reference numeral 1 is a transformer winding wound on the laminated cores. The shown transformer is a 3 phase transformer; hence 3 coils or windings are seen. There are frames depicted by reference numeral 2 at top and at bottom of the 3 windings to clamp them together. Top stay depicted by reference numeral 3 (without locating bucket (5) welded on it) and reference numeral 4 (with locating bucket (5) welded on it) are used to keep both sides of the frame together. Reference numeral 5 depicts the locating post

which is welded on cover from bottom side. Reference numeral 6 depicts the Locating bucket welded to top stay. The assembly of core, winding, frame top stays and other necessary components is called as Core eoil assembly (CCA). When CCA is completely manufactured it is lifted with crane and placed in tank depicted by reference numeral 10. Then tank cover, depicted by reference numeral 9, is lowered on the tank. Locating posts (5) projects from cover bottom and goes in to the locating bucket (6) welded on the top stay. There is free space between locating post (5) and locating bucket (6) which is filled with epoxy solution. After setting, epoxy solution hardens and holds locating posts together with CCA. When transformer experiences shock or jerk during transport the force acted upon the CCA is transferred to the tank cover and then tank through hardened epoxy and locating bucket. And hence the CCA remains safe during transport.
Although current methods of locating CCA with transformer tank serve it purpose fully there exits need of improvement due to various reasons as follows.
Sometimes, it is observed that due to tolerances in manufacturing and or irregularities and abnormalities in the fabrication and assembly process, dimensional parameters of CCA defers slightly from the designed values. If the height of CCA goes up, then it results in projecting locating post of Figure 1 beyond required limit. Also, sometimes the CCA tilts to one side. Due to above changes, the locating post does not come exactly at the centre of the locating box assembly. To accommodate these changes, then requires major rework in the cover of transformer tank which takes much time and requires monetary resources. If this happens, meeting periodical target becomes difficult and hence production comes under pressure. This also in turn affects customer. The second method when used requires highest degree of finest production technique which requires extra time. Also, insertion of locating post in the epoxy solution in the locating bucket cannot be seen physically and to ensure this one has to depend upon the judgment.

OBJECTS OF THE INVENTION:
An object of the invention is to provide a stable fit and a stable hold on different types of core assemblies of transformers, during transportation, irrespective of irregularities in their pre-defined shape or size or height.
Another object of the invention is to reduce the amount of money spent which is usually required to change the holding assembly for adjustments due to aberrations in core assembly.
Yet another object of the invention is to increase the throughput by reducing the time involved in fixing the core assembly to the inside of a tank which is used as an enclosure during transportation.
SUMMARY OF THE INVENTION-.
According to this invention, there is provided an assembly for fixing a transformer core assembly of a transformer to the interior of a tank, at its top cover, said assembly comprising:
- a top stay unit fitted atop said core assembly, adapted to provide means for fixing;
- a first cylindrical shaft (locating bucket) fitted on to said top stay unit;
- a second cylindrical shaft (locating box) fitted on to said tank cover, adapted to match or correspond said first cylindrical shaft in a concentric fit, within its interior periphery;
- a locating disc, adapted to fit within the interior diameter of said second cylindrical shaft, for distributing the load of said core assembly; and
- a locating post, passing through said locating disc, having its operative vertical axis eccentric to the operative vertical axis of said locating disc, by a pre-defined eccentricity, to form an eccentrically fitted locating post, said operative vertical axis of said eccentrically fitted locating post adapted to define a locus of points in a circle by virtue of rotation of said disc within said first and second cylindrical

shaft to select an appropriate geometrical position, from one of the many defined loci, in relation to the geometrical position of said core assembly for a stable hold.
Typically, a locating bucket is fitted to said top stay unit for receiving said locating post.
Typically, a setting material is adapted to be set into said locating bucket fitted to said top stay unit for receiving and firmly fitting said locating post inside said locating bucket.
Typically, said setting material is an epoxy solution which hardens after setting.
Typically, said locating disc is adapted to rotate within inner diameter of said second cylindrical shaft to achieve desired location of said locating post in relation to said core assembly for a linear match of the geometrical positions before hardening of epoxy.
According to another embodiment of this invention, there is provided an assembly for fixing transformer core assembly of a single or three phase transformer to the interior of a tank, at its top cover, said assembly comprising:
a top stay unit fitted atop said core assembly, adapted to provide means for fixing;
at least two first cylindrical shafts (locating bucket) fitted on to said top stay unit
with one top stay atone end of CCA and another at other end;
at least two second cylindrical shafts (locating box) fitted on to said tank cover,
adapted to match or correspond each of said first cylindrical shafts respectively, in
a concentric fit, within its interior periphery;
at least two locating discs, adapted to fit within the interior diameter of each of
said second cylindrical shafts, respectively, for distributing the partial load of a
core assembly at the one end of said tank and for distributing the partial load of a
core assembly at the other end of said tank;
at least two locating posts, each passing through said locating discs, respectively,
each having its operative vertical axis eccentric to the operative vertical axis of
each of said locating discs, by a pre-defined eccentricity, to form an eccentrically
fitted locating post, said operative vertical axis of said eccentrically fitted locating
post adapted to define a locus of points in a circle by virtue of rotation of said disc

within said first and second cylindrical shaft to select an appropriate geometrical position, from one of the many defined loci, in relation to the geometrical position of said core assemblies for a stable hold.
Typically, according to the embodiment for fixing a thee core transformer, the central core of said transformer is adapted to be fitted to said top stay without said locating bucket.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
Figures la and lb illustrate various views of the assembly of the prior art according to a first embodiment of fixing;
Figures 2a and 2b illustrate various views of the assembly of the prior art according to a first embodiment af fixing;
The invention will now be described in relation to the accompanying drawings, in which:
Figures 3a, 3 b, 4a, and 4c illustrate a schematic of the assembly for fixing;
Figure 5 illustrates the locating post and its location through the locating disc ; and
Figure 6 illustrates the assembly of this invention in an exploded view.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
According to this invention, there is provided an assembly for fixing a transformer core assembly of a transformer to the interior of a tank, at its top cover
Figures 3a, 3b, 4a, and 4c illustrate a schematic of the assembly for fixing.

Reference numeral 1 depicts Coil or winding made from copper conductor. Reference numeral 2 depicts Metal frames as a part of core and coil clamping structure. Reference numeral 3 depicts Top stay without locating bucket welded on it. When a transformer, and thus its core coil assembly (CCA) is fully manufactured, it is lifted and placed inside the transformer tank depicted by reference numeral 10. Then tank cover, depicted by reference numeral 9, is lowered and placed on the tank. There is opening on the cover (9) at the centre of the round locating box assembly, depicted by reference numeral 6 & 7. The position of this opening normally matches with the locating bucket, depicted by reference numeral 11, welded on the top stay, depicted by reference numeral 4. The independent eccentric top down locating post, depicted by reference numeral 5, is placed in the locating box assembly (6&7), the projecting part of the locating post gets inserted in the locating bucket (11) approximately at the centre. If due to manufacturing abnormalities, the locating post is shifted from its design location, then it may be rotated around its vertical axis until correct position at centre is achieved. Once this is done, the position is marked on the locating post disc and the locating post is removed. Now, epoxy solution, depicted by reference numeral 8, is made and poured in to the locating bucket (11) from the opening in the locating box assembly (6&7). Then with no loss of time, locating post (5) is placed in the marked position in locating box assembly (6&7) welded on cover (9). This way correct matching of locating bucket and locating post is achieved and insertion of locating post in the correct position in epoxy is ensured. If there is increase of height of CCA, the locating post can be taken away from transformer and be modified easily and in parallel with no loss of production time.
In accordance with an embodiment of this invention, the locating post is neither welded on cover nor on CCA; on the contrary, it has a circular locating disc which has an eccentrically welded locating post through it. This eccentricity satisfies the need of adjustment in the location of locating post with respect to the core coil assembly and hence saves last minute work on nearly complete transformer, thus saving time and money.

Figure 5 illustrates the locating post (LP) and its location through the locating disc (LD). According to this invention, the locating post (LP) is fitted or welded eccentric to the locating disc (LD). The eccentricity is denoted by E.
Figure 6 illustrates the assembly of this invention in an exploded view. The eccentric locating post is referenced by numeral 10. A tank cover (20) is provided with a circular locating box (30) welded on it. The top stay, which is a part of the CCA is referenced by numeral 40. Top stay (40) is welded circular with locating bucket (50) at top. When assembled, the locating post (10) sits on the tank cover (20) projecting its cylindrical post in locating bucket (50). The motion of the locating post (10) is restricted in horizontal i.e. x and y direction due to circular locating box (30) and in vertical i.e. z direction by cover plate (20) of the transformer and canopy of the circular locating box (30). Now if the location of locating bucket (50) is shifted from its intended location, then an appropriate and stable fit can be obtained just by rotating the eccentric locating post (10), thus accounting and adjusting for that shift.

We claim,
1. An assembly for fixing a transformer core assembly of a transformer to the interior of
a tank, at its top cover, said assembly comprising:
- a top stay unit fitted atop said core assembly, adapted to provide means for fixing;
- a first cylindrical shaft (locating bucket) fitted on to said top stay unit;
a second cylindrical shaft (locating box) fitted on to said tank cover, adapted to match or correspond said first cylindrical shaft in a concentric fit, within its interior periphery;
- a locating disc, adapted to fit within the interior diameter of said second
cylindrical shaft, for distributing the load of said core assembly; and
a locating post, passing through said locating disc, having its operative vertical axis eccentric to the operative vertical axis of said locating disc, by a pre-defined eccentricity, to form an eccentrically fitted locating post, said operative vertical axis of said eccentrically fitted locating post adapted to define a locus of points in a circle by virtue of rotation of said disc within said first and second cylindrical shaft to select an appropriate geometrical position, from one of the many defined loci, in relation to the geometrical position of said core assembly for a stable hold.
2. An assembly as claimed in claim 1 wherein, said locating bucket is fitted to said top
stay unit for receiving said locating post.
3. An assembly as claimed in claim 1 wherein, a setting material is adapted to be set into a locating bucket fitted to said top stay unit for receiving and firmly fitting said locating post inside said locating bucket.
4. An assembly as claimed in claim 3 wherein, said setting material is an epoxy solution which hardens after setting.
5. An assembly as claimed in claim 1 wherein, said locating disc is adapted to rotate within inner diameter of said second cylindrical shaft to achieve desired location of

said locating post in relation to said core assembly for a linear match of the geometrical positions.
6. An assembly for fixing transformer core assembly of a three phase transformer to the
interior of a tank, at its top cover, said assembly comprising:
a top stay unit fitted atop said core assembly, adapted to provide means for fixing;
- at least two first cylindrical shafts (locating bucket) fitted on to said top stay unit with one top stay at one end of CCA and another at other end; at least two second cylindrical shafts (locating box) fitted on to said tank cover, adapted to match or correspond each of said first cylindrical shafts respectively, in a concentric fit, within its interior periphery;
at least two locating discs, adapted to fit within the interior diameter of each of said second cylindrical shafts, respectively, for distributing the load of a first core assembly at the one end of said tank and for distributing the load of a second core assembly at the other end of said tank;
at least two locating posts, each passing through said locating discs, respectively, each having its operative vertical axis eccentric to the operative vertical axis of each of said locating discs, by a pre-defined eccentricity, to form an eccentrically fitted locating post, said operative vertical axis of said eccentrically fitted locating post adapted to define a locus of points in a circle by virtue of rotation of said disc within said first and second cylindrical shaft to select an appropriate geometrical position, from one of the many defined loci, in relation to the geometrical position of said core assemblies for a stable hold.
7. An assembly as claimed in claim 6, wherein the central core of said transformer is adapted to be fitted to said top stay without said locating bucket.