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
An assembly for providing improved thermal performance in Transformers
and Reactors.
APPLICANT
Crompton Greaves Limited, CG House, Dr. Annie Besant Road, Worli, Mumbai -400030, Maharashtra, India, an Indian Company
INVENTORS
Patil Shubhangi Sachin of Crompton Greaves Ltd, Tl division, CG Global R&D Centre, Kanjur (E), Mumbai 400042, Maharashtra, India and Chaudhari Sushil Ekanath of Crompton Greaves Ltd, High Voltage Product Technology Centre, CG Global R&D Centre, Kanjurmarg (E), Mumbai - 400 042, 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.

FIELD OF THE INVENTION:
This invention relates to the field of transformer, shunt reactors, and such electrical equipment.
Particularly, this relates to the effective cooling for winding and insulation arrangement in transformers and reactors.
Specifically, this invention relates to an assembly for providing improved thermal performance in transformers and reactors.
BACKGROUND OF THE INVENTION:
A transformer is a device which transfers energy from once circuit to another through mutually inductive coils. The transformer has a set of coils which perform this function. It is a static equipment. The set of coils are conductors which are inductively coupled. The coils are primary winding which are typically connected to a first energy source and secondary winding to which the transfer of energy takes place. Power transformer is used to step up or step down voltage and is an integral component of any efficient power distribution network. A typical transformer incorporates coils of copper conductors as winding wound around a core and covered with a paper-based insulator. Power transformers oil filled transformers. Essential functions of the transformer oils that serve both functions: electrical insulation and heat dissipation. The oil may be a highly refined mineral oil that remains stable at transformer operating temperature. The oil provides a dielectric medium and provides capacitance between the core and the transformer housing tank.
Like transformers, shunt reactors are vital part of the efficient operation of long

transmission or AC cable high voltage power lines. The shunt reactor compensates the capacitive generation on power lines to avoid non-controlled voltage rise especially on lightly loaded lines. Depending on their connections, reactors are connected in series and parallel. Shunt reactors can be connected to transmission system through tertiary winding of power transformer connected to transmission line to be compensated. And also can be connected directly to the transmission line to be compensated. Shunt reactors are mainly used for limiting voltage rise on long transmission lines at light load by supplying reactive power and compensating capacitive component, for limiting switching surges and for suppressing the harmonic contents.
Thus, the shunt reactors need to have two windings same as transformer. Shunt reactors contain the same components as power transformers, like windings, core, tank, bushings and insulating oil and are suitable for manufacturing in transformer factories. The main difference is the reactor core limbs, which have non-magnetic gaps inserted between packets of core steel.
Furthermore, Neutral Grounding Reactors are used in generator applications to limit the fault current to prevent damage to the generator and also to provide harmonic control when used in applications with electronic equipment downstream.
During drying process of the power transformers or reactor, complete removal of moisture is not possible up to expected level due to thicker innermost insulation part. This contributes to higher level of tan delta which in turn contributes to transformer losses and aging in future. Thus the reduce the higher tan delta values, to improve the heat dissipation of such transformers or reactors a arrangement is

developed. According to the prior art, top and bottom plate in neutral grounding reactors had been made with single thick precompressed board (PCB) ring. This held higher moisture content and resulted in lower heat dissipation and being an innermost insulation, it was very difficult to remove moisture up to desired level.
OBJECTS OF THE INVENTION:
An object of the invention is to improve thermal performance of transformers or reactors.
Another object of the invention is to improve heat dissipation characteristics of transformers or reactors.
Yet another object of the invention is to provide an assembly for providing improved thermal performance in transformers and reactors such that there is reduction in moisture content.
Still another object of the invention is to provide an assembly for providing improved thermal performance in transformers and reactors such that there is relatively low tan delta.
An additional object of the invention is to provide an assembly for providing improved thermal performance in transformers and reactors such that there are relatively low leakage current paths.
SUMMARY OF THE INVENTION:
According to this invention, there is provided an assembly for providing improved

thermal performance in transformers and reactors, said assembly comprises:
a. operative bottom plate comprising a hole located on it, said bottom plate
farther comprising sector shaped blocks of pre-defined thickness
circumferentially arranged about said hole; and additional blocks adapted to
be located on the operative inner side of said sector shaped blocks such that
they are located between said sector shaped blocks and said hole,
correspondingly; and
b. operative top plate comprising a hole located on it, said top plate further
comprising sector shaped blocks of pre-defined thickness circumferentially
arranged about said hole; and additional blocks adapted to be located on the
operative inner side of said sector shaped blocks such that they are located
between said sector shaped blocks and said hole, correspondingly.
Typically, said bottom plate is a relatively thinner base bottom plate.
Preferably, said bottom plate is a 0.5mm thick base bottom plate.
Preferably, said sector shaped blocks pre-compressed board blocks.
Preferably, Said sector shaped blocks are six numbers of sector shaped blocks.
Typically, said additional blocks have a thickness greater than said sector shaped blocks.
Preferably, said additional blocks are FRP blocks or Nomex paper.
Typically, said assembly comprises locking pin arrangements located on said

sector shaped blocks so that the windings and equipment may be located on said assembly.
Typically, said assembly comprises locking pin arrangements located on said additional blocks so that the windings and equipment may be located on said assembly.
Typically, said assembly comprises:
i. said operative bottom plate;
ii. said operative top plate; and
iii. windings located between said bottom plate and said top plate.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
The invention will now be described in relation to the accompanying drawings, in which:
Figure 1 illustrates a top isometric view of a bottom plate of the assembly;
Figure 2 illustrates a top view of the bottom plate of Figure 1; and
Figure 3 illustrates a side view of the bottom plate of Figure 1.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
According to this invention, there is provided an assembly for providing improved thermal performance in transformers and reactors.
Figure 1 illustrates a top isometric view of a bottom plate of the assembly.

Figure 2 illustrates a top view of the bottom plate of Figure 1.
Figure 3 illustrates a side view of the bottom plate of Figure 1.
In accordance with an embodiment of this invention, there is provided a base bottom plate (12). According to the prior art, this bottom plate was of about 75mm. The base bottom plate of this invention is a relatively thinner plate. The base bottom plate includes a hole (13) located on it.
In accordance with another embodiment of this invention, there are provided sector shaped blocks (14) of pre-compressed board block of pre-defined thickness. These sector shaped blocks are circumferentially arranged about the hole (13) on the base bottom plate (12). Typically, there are six numbers of sector shaped pre-compressed board blocks. This provides extra path for oil flow which helps in faster heat dissipation.
In accordance with yet another embodiment of this invention, there are provided additional blocks (15) adapted to be located on the operative inner side of the sector shaped blocks (14) such that they are located between the sector shaped blocks (14) and the hole (13), at each located sector shaped block. These additional blocks, typically, have a thickness greater than the sector shaped blocks. Also, these additional blocks (15) are FRP blocks and hence do not absorb any moisture. Therefore, it becomes easy for removal of moisture from inside of windings which are advantageously placed on the sectors and blocks. These additional blocks (15) aid in holding the windings located around it.
In accordance with still another embodiment of this invention, there are provided

locking pin arrangements (17a, 17b) located on the sector shaped blocks as well as on the additional blocks so that the windings and structure may be located on this assembly.
It is to be understood that the above-mentioned assembly forms a bottom portion of the entire assembly. There is provided a similar top plate such which can be located on the windings from the top.
The technical advancement of this invention lies in provisioning a new assembly for improving thermal performance of transformers or reactors or any equipment with windings. This assembly holds the windings that have moisture content and need to be dried in the manner disclosed above and provide relatively better moisture reduction capabilities along with relatively faster heat dissipation characteristics. Therefore, there is relatively lower tan delta and relatively lower leakage current paths. The inventive step also lies in providing an extra path for oil flow and enhanced heat dissipation, due to the use of this assembly.
While this detailed description has disclosed certain specific embodiments of the present invention for illustrative purposes, various modifications will be apparent to those skilled in the art which do not constitute departures from the spirit and scope of the invention as defined in the following claims, and it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

We claim,
1. An assembly for providing improved thermal performance in winding based
electrical equipment, said assembly comprising:
a. operative bottom plate comprising a hole located on it, said bottom
plate further comprising sector shaped blocks of pre-defined thickness
circumferentially arranged about said hole; and additional blocks
adapted to be located on the operative inner side of said sector shaped
blocks such that they are located between said sector shaped blocks
and said hole, correspondingly; and
b. operative top plate comprising a hole located on it, said top plate
further comprising sector shaped blocks of pre-defined thickness
circumferentially arranged about said hole; and additional blocks
adapted to be located on the operative inner side of said sector shaped
blocks such that they are located between said sector shaped blocks
and said hole, correspondingly.
2. The assembly as claimed in claimed 1, wherein said bottom plate is a relatively thinner base bottom plate.
3. The assembly as claimed in claimed 1, wherein said bottom plate is a 0.5mm thick base bottom plate.
4. The assembly as claimed in claimed 1, wherein said sector shaped blocks pre-compressed board blocks.

5. The assembly as claimed in claimed 1, wherein said sector shaped blocks are six numbers of sector shaped blocks.
6. The assembly as claimed in claimed 1, wherein said additional blocks have a thickness greater than said sector shaped blocks.
7. The assembly as claimed in claimed 1, wherein said additional blocks are FRP blocks or Nomex paper.
8. The assembly as claimed in claimed 1, wherein said assembly comprising locking pin arrangements located on said sector shaped blocks so that the windings and equipment may be located on said assembly.
9. The assembly as claimed in claimed 1, wherein said assembly comprising locking pin arrangements located on said additional blocks so that the windings and equipment may be located on said assembly.
10. The assembly as claimed in claimed 1, wherein said assembly comprising: i. said operative bottom plate;
ii. said operative top plate; and
iii. windings located between said bottom plate and said top plate.