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: AN IMPROVED ARC CHUTE
ASSEMBLY FOR USE IN
SWITCHGEAR DEVICES
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:

FIELD OF THE INVENTION
The present invention relates to an arc chute assembly. More particularly, the invention is concerned about an improved arc chute assembly for use in switchgear devices.
BACKGROUND OF THE INVENTION
US 6784393B2 discloses 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.
EP 2110831A2 discloses 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 deion 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.
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.
Thus, there is a need to overcome the problems of the prior art. The conventional product has its limitation in electromagnetic pull and thermal cooling of the electric

arc which plays the main role in its quenching. Thus there is a need to overcome the problems of the prior art. There is a need to improve electromagnetic pull on the arc. There is also need to have a design of arcing chamber to be as effective as possible. So, the present inventors have developed an improved arc chute assembly for use in switchgear devices for upgradation of circuit breakers to enable it work at an operating voltages which would be at the higher end in low voltage band .It also used in bettering the arc quenching property of the circuit breaker.
OBJECTS OF THE INVENTION
An object of the present invention is to overcome the problems/disadvantages of the prior art.
Another object of the present invention is to provide an improved arc chute assembly for use in switchgear devices.
These and advantages of the present invention will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings.
SUMMARY OF THE INVENTION
According to one aspect of the present invention there is provided an improved arc chute assembly for use in switchgear devices, said assembly comprises: deion plate arrangement; plurality of cooling plate means;
wherein said deion plate arrangement comprising substantially flat shaped deion plate means having plurality of substantially step shaped deion plate means arranged such that at least one said substantially step shaped deion plate is placed there inbetween said two consecutive flat shaped deion plates such that more electromagnetic pull is generated on an electric arc;

wherein said cooling piate means being operatively located on almost top of said deion plate means so as to absorb heat.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Other features as well as the advantages of the invention will be clear from the
following description.
In the appended drawings:
Figure 1 shows top and side view in 3D according to an embodiment of this invention in arc chute.
Figure 2 shows bottom and side view in 3D to an embodiment of this invention in arc chute.
Figure 3 shows cross sectional view in 3D to an embodiment of this invention in arc chute.
Figure 4 shows front view of the cross section to an embodiment of this invention in arc chute.
Figure 5 shows detailed view of cooling plates and supporting fixtures in 3D to an embodiment of this invention in arc chute.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS
In the following detailed description, reference is made to the accompanying drawings that form a part hereof, and illustrate the best mode presently contemplated for carrying out the invention. Further functioning of the assembly has been discussed below to describe the way the assembly operates. However, such description should not be considered as any limitation of scope of the present unit.

The structure thus conceived is susceptible of numerous modifications and variations, all the details may furthermore by replaced with elements having technical equivalence. In practice the materials and dimensions may be any according to the requirements, which will still be comprised within its true spirit.
According to a preferred embodiment of the invention, there is provided an improved arc chute assembly for use in switchgear devices. The present invention is provided with an improved 'arc chute' which is a component used in a switchgear. The arc chute assembly as shown in figure 1 comprises of deion plate arrangement comprising flat deion plates (7) and stepped deion plates (8) which are placed in between the flat deion plates (7), as shown in figures 2 & 4, made up of mild steel and placed with micker which are placed with space between them . The plates see crimped on to the side plate (1), as shown in fig 2, is made up of glass filled polyester. Top cooling plates (6) as shown in figure 5 and bottom cooling plates (5) as shown in figure (5). There are these cooling plates which are placed at the top of deion plates (no electrical contact between them is desired). These plates are made of material which aids the process of cooling, e.g. Aluminium, brass (or any alloy or smart material or any material that has this desired property can be introduced) on top of deion plates and covered on top with top places.
The deion plates attract the electric arc by the virtue of their ferromagnetic property. The deion plates with the specific profile (8) as shown in figure 3 exerts more electromagnetic pull on the electric arc than its neighboring plates which has a flat profile (7) as shown in (figures 2 & 4), this difference in electromagnetic pull in nearby plates increases the probability of formation of several minor arcs which results in higher arc voltage.
The heat generated from the arc contributes to a great extent in ionizing the arcing chamber and if not cooled appropriately results, in re-strike of electric arc. This requirement has resulted in introduction of cooling plates which will absorb the heat and act as a heat exchanger. The bottom cooling folate (5) has vents whose diameter

is larger than the vents of top cooling plates (6) also the vents are provided with chamfers, this unique feature helps in two ways, one it increase the surface area of heat exchange for the generated gases, two this feature increases the gas escape velocity by the virtue of diverging shape of vent holes. Also, the offset of vents in the top and bottom cooling plates serves the purpose of higher heat exchange. The number of cooling plates , arrangement of vents can vary and also the metal used in their make.
ADVANTAGES OF THE INVENTION
1. Less time is needed for cooling of arc.
2. Improve the life of the circuit breakers.

WE CLAIM
1. An improved arc chute assembly for use in switchgear devices, said
assembly comprises:
deion plate arrangement;
plurality of cooling plate means;
wherein said deion plate arrangement comprising substantially flat shaped
deion plate means having plurality of substantially step shaped deion plate
means arranged such that at least one said substantially step shaped deion
plate is placed there inbetween said two consecutive flat shaped deion plates
such that more electromagnetic pull is generated on an electric arc;
wherein said cooling plate means being operatively located on almost top of
said deion plate means so as to absorb heat.
2. Assembly as claimed in claim 1, wherein said cooling plate means comprising plurality of top cooling plate means and plurality of bottom cooling plate means.
3. Assembly as claimed in claim 1, wherein said cooling plate means comprising plurality of vents.
4. Assembly as claimed in claims 2 and 3, wherein said bottom cooling plate vent diameter being larger than said top cooling plate vent diameter.
5. Assembly as claimed in claim 1, wherein said cooling plate means comprising substantially "U" shaped profile having protrusions on either side.
6. Assembly as claimed in claim 1, wherein said cooling plate means being made up of Aluminium, or brass or the like material.

7. Assembly as claimed in daim 1, wherein said deion plate means being made up of mild steel.
8. Assembly as claimed in claim 1 wherein said deion plate means comprising nickel plating.
9. Assembly as claimed in claim 1 further comprises a side plate means.
10. Assembly as claimed in claim 9, wherein said side plate means being made up of glass filled polyester or like material.
11. An improved arc chute assembly for use in switchgear devices as herein substantially described and illustrated with the accompanying drawings.