FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10; rule 13)
1. Title of the invention. - IMPROVED ARC CHUTE ASSEMBLY FOR USE IN CIRCUIT BREAKERS
2. Applicant(s)

(a) NAME: LARSEN & TOUBRO LIMITED
(b) NATIONALITY: An Indian Company.
(c)ADDRESS: L & T House, Ballard Estate, Mumbai 400 001,
State of Maharashtra, India
3. PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed:

TECHNICAL FIELD OF THE INVENTION
The present invention relates generally to circuit breakers. More particularly the invention relates to an improved arc chute assembly for use in circuit breakers providing better arc quenching.
BACKGROUND AND THE PRIOR ART
A circuit breaker is a device used in the clearing of a fault current Whenever a fault current flow in a system the circuit breaker used is expected to clear the fault with minimal damage to itself. Opening of contacts of the circuit breaker results in the formation of an electric arc between the contacts. The electric arc erodes the contacts and henceforth reduces the life of the circuit breaker.
The conventional product has its limitation in electromagnetic pull and thermal cooling of the electric arc which plays the main role in its quenching. Therefore the design of arcing chamber needs to be as effective as possible and arc chutes plays paramount role in it.
EP 2110831A2 entitled "Arc chute assembly for a circuit breaker" teaches an arc chute assembly includes a housing having a lateral axis and a quenching portion disposed within the housing. The quenching portion includes at least two de-ion plates being spaced along the lateral axis of the housing and each having a cut portion wherein the cut portions are staggered along the lateral axis with respect to one another and are configured to mitigate an arc.
US 6784393B2 entitled "Arc quenching device for low voltage switching devices" teaches an arc quenching device for an air-switching low-voltage switching device includes quenching plates, which are arranged between and attached to parallel insulating walls, as well as a cover. A separate cooling device may be introduced into the space between the quenching plates and the cover. The

cooling device is in the form of an insert cartridge and contains deionization technology for switching gases. Attachment pins on the cooling device and corresponding holding openings on the inside of the cover make it possible to fit the cooling device to the cover before this cover engages with the insulating walls.
Thus, there is a need to overcome the problems of the prior art.
Therefore, the present invention provides an improved arc chute assembly for use in circuit breakers having unique cooling mechanism using smart material such as Shape memory alloy. It would up grade the circuit breakers to enable it work at operating voltages which would be at the higher end in low voltage band and also would enable in bettering the arc quenching property of the circuit breaker.
OBJECTS OF THE INVENTION
A basic object of the present invention is to overcome the disadvantages/drawbacks of the known art.
Another object of the present invention is to provide an improved arc chute assembly for use in circuit breakers providing better arc quenching.
Another object of the present invention is to provide an effective cooling system.
Yet another object of the present invention is to use smart materials for better heat dissipation.
These and other advantages of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings.

SUMMARY OF THE INVENTION
There is provided an improved arc chute assembly.
According to one embodiment of the present invention, there is provided An improved arc chute assembly for use in circuit breakers providing better arc quenching, wherein said assembly comprising a plurality of de-ion plates.
Other embodiment of the present invention provides for a cooling system comprising a plurality of cooling plates and a plurality of springs, said cooling system mounted on said de-ion plates and a cover means placed on top of said cooling system.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
In the appended drawings:
FIG. 1 illustrates top and side view in 3D according to an embodiment of this invention in arc chute.
FIG. 2 illustrates cooling system according to an embodiment of this invention in
arc chute.
FIG. 3 illustrates cooling system according to an embodiment of this invention in arc chute.
FIG. 4 illustrates bottom & side view in 3D according to an embodiment of this invention in arc chute.

DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The following drawings are illustrative of particular examples for enabling methods of the present invention, are descriptive of some of the methods, and are not intended to limit the scope of the invention. The drawings are not to scale (unless so stated) and are intended for use in conjunction with the explanations in the following detailed description.
Reference is first invited to Fig 1 where the top and side view in 3D according to an embodiment of this invention in arc chute is shown.
FIG. 2 shows cooling system according to an embodiment of this invention in arc
chute.
FIG. 3 shows cooling system according to an embodiment of this invention in arc chute.
FIG. 4 shows bottom & side view in 3D according to an embodiment of this invention in arc chute.
The invented system is thus an improved arc chute assembly for use in circuit breakers providing better arc quenching.
DETAILED DESCRIPTION OF THE INVENTION
Accordingly in the present invention there is provided an improved arc chute assembly for use in circuit breakers having unique cooling mechanism using smart material such as Shape memory alloy. In which there are some component made of shape memory alloy and some of other thermally conductive material, such as Nitinol, Aluminium and Brass to dissipate heat more quickly and effectively.

The shape memory alloy has the special property of converting heat energy into mechanical energy by changing its own shape. It has two advantages over conventional cooling plates, one it acts as a medium of conductive heat exchange and two, and it dissipates more heat by virtue of its smart property by converting heat energy to mechanical output. The purpose of invention is for up gradation of circuit breakers to enable it work at an operating voltages which would be at the higher end in low voltage band .It also helps in bettering the arc quenching property of the circuit breaker.
The present invention provides an improved arc chute assembly for use in circuit breakers. The arc chute assembly as shown in figure 1 comprises of de-ion plates (7 in fig 4), Cooling System (2, 3 in fig 2), base of the cooling plate (1 in Fig-2) and other necessary fixtures. The Cooling System (2, 3 in fig 2) comprises of springs (3 in fig-2) which is made of Shape memory alloy such as Nitinol and cooling plates (2 in fig-2) of good thermally conductive material such as Aluminuim or Brass. The improved cooling system comprising shape memory alloy spring and thermally conductive cooling plates is a unique feature. The cooling system is placed at the top of de-ion plates (no electrical contact between them is desired).The system is so designed that it aids the process of cooling very effectively.
The spring and cooling plates in the cooling system are so designed that the system dynamically moves to facilitate higher work done by the system while exchanging heat with the generated gases. The de-ion plates attracts the electric arc by the virtue of their ferromagnetic property. The heat generated from the arc contributes to a great extent in ionizing the arcing chamber and if not cooled appropriately results in restrike of electric arc. This requirement has resulted in introduction of cooling system which will absorb the heat and act as a heat exchanger. The number of cooling plates and springs may vary and also the material used in their make. There may be cover on the top of the cooling system.

The arc chute assembly comprises of de-ion plates (7 in fig. 4), Cooling System (4, 5 in fig 3), base of the cooling plate (1 in Fig-2) and other necessary fixtures. The Cooling System (4, 5 in fig 3) comprises of springs (4 in fig-3) which is made of Shape memory alloy such as Nitinol and cooling rods (5 in fig-3) of good thermally conductive material such as Aluminuim or Brass. The improved cooling system comprising shape memory alloy spring and thermally conductive cooling rods is a unique feature. The cooling system is placed at the top of de-ion plates (no electrical contact between them is desired).The system is so designed that it aids the process of cooling very effectively.
The de-ion plates attracts the electric arc by the virtue of their ferromagnetic property. The heat generated from the arc contributes to a great extent in ionizing the arcing chamber and if not cooled appropriately results in restrike of electric arc. This requirement has resulted in introduction of cooling system which will absorb the heat and act as a heat exchanger. The number of cooling rods and springs may vary and also the metal used in their make. There may be cover on the top of the cooling system.
ADVANTAGES:
1. Better arc quenching
2. Increasing life of circuit breakers.
Although the embodiments herein are described with various specific embodiments, it will be obvious for a person skilled in the art to practice the embodiments herein with modifications. However, all such modifications are deemed to be within the scope of the claims.
It is also to be understood that the following claims are intended to cover all of the generic and specific features of the embodiments described herein and all the statements of the scope of the embodiments which as a matter of language might be said to fall there between.

WE CLAIM:
1. An improved arc chute assembly for use in circuit breakers providing
better arc quenching, wherein said assembly comprising:
a plurality of de-ion plates;
a cooling system comprising a plurality of cooling plates and a plurality of spring means, said cooling system mounted on said de-ion plates and a cover means placed on top of said cooling system
wherein the said spring means are mounted on the said cooling plates to convert the heat energy of the arc to mechanical energy creating a dynamic cooling system.
2. Assembly as claimed in claim 1 wherein said spring means being selectively made of materials like shape memory alloy like Nitinol, mild steel, Aluminium and the like.
3. Assembly as claimed in claim 1 wherein said springs dissipating heat through heat exchange with generated gases.
4. Assembly as claimed in claim 1 wherein said cooling plates are made of thermally conductive materials dissipating heat effectively like shape memory alloy like Nitinol, mild steel, Aluminium and the like.
5. An improved arc chute assembly for use in circuit breakers providing better arc quenching as herein described and illustrated with respect to accompanying drawings.