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THE PATENTS ACT, 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10; rule 13)
1. Title of the invention: A DEION PLATE ARRANGEMENT 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:

FIELD OF THE INVENTION
The present invention relates to a DC/AC Circuit breakers. More particularly, the invention relates to a Deion plate arrangement for use in circuit breakers with higher arc pulling force. The present invention is concerned about the unique profile designed by the present inventors and provided in the deion plates used in the circuit breakers.
BACKGROUND OF THE INVENTION AND PRIOR ART
Circuit breakers are an important safety feature in most electrical circuits, and they act to prevent excessive currents caused by short circuits, for example. Low-voltage current limiting circuit breakers are activated by a trip solenoid when a critical current is exceeded. The solenoid moves two contacts apart to break the circuit. However, as soon as the contacts are separated an electric arc forms between them, ionizing the air in the gap, increasing the electrical conductivity of air to that of the hot plasma that forms and current continues to flow. The currents involved may be as large as 10000 Ampere.
Critical to the success of the circuit breaker is that it is designed to cause the arc to move away from the contacts, into a widening wedge-shaped region. This lengthens the arc, and then moves it onto a series of separator plates called an arc divider or splitter / Deion plates.

The arc divider raises the voltage required to sustain the arcs across it, above the voltage that is provided across the breaker, so that the circuit is broken and the arcing dies away. This entire process occurs in milliseconds, and is important to reduce the Arcing time.
OBJECTS OF THE INVENTION
One object of the present invention is to overcome the disadvantages / drawbacks of the prior art. A basic object of the present invention is to provide to a Deion plate arrangement for use in circuit breakers with higher arc pulling force.
Another object of the present invention is to provide Deion plates keeping in mind the reduction of Arcing time & the let through of the circuit breaker in turn enhance the SC breaking capacity of the circuit breaker where the designed arc splitter is beneficial in reducing all of the above without affecting the performance of the switch.
These and other 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
The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is not an extensive overview of the present invention. It is not

intended to identify the key/critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concept of the invention in a simplified form as a prelude to a more detailed description of the invention presented later.
According to one of the aspect of the present invention the system is provided a deion plate arrangement for use in circuit breakers, said arrangement comprising :
plurality of deion plates; said each deion plate being staggered in proximity to the other deion plate;
wherein said each deion plate of the staggered deion plates comprising a substantially V-shaped modular profile having an inward cut and said each deion plate being arranged in opposite sense to the next deion plate located in its proximity
whereby such arrangement providing a substantially nonlinear path adapted to increase the magnitude and the range of the magnetic forces and reducing the arcing time.
According another aspect of the present invention there
is provided an arc chute arrangement for use in circuit
breakers, said arrangement comprising:
a first side wall having a substantially V-shaped cut
profile;
a second side wall in proximity to said first wall,
said second wall having a substantially V-shaped cut
profile;

deion plate arrangement secured between said first wall
and said second wall; said plate arrangement
comprising:
plurality of deion plates; said each deion plate being
staggered in proximity to the other deion plate;
wherein said each deion plate of the staggered deion plates comprising a substantially V-shaped modular profile having an inward cut and said each deion plate being arranged in opposite sense to the next deion plate located in its proximity whereby such arrangement providing a substantially non-linear path adapted to increase the magnitude and the range of the magnetic forces and reducing the arcing time.
According to another aspect of the present invention there is provided a circuit breaker comprising a deion plate arrangement as described herein above.
According to another aspect of the present invention there is provided a circuit breaker comprising an arc chute arrangement as described herein above.
Other aspects, advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
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.
Figure 1 illustrates prior art Deion plates.
Figure 2 illustrates a DC/AC Circuit breaker.
Figure 3 illustrates V-shaped cutting (profile A and
profile B) of Deion plates.
Figure 4 illustrates Analytical relationship -Force
coupling between Electric Arc and ferromagnetic plate
Figure 5 illustrates Distribution of electromagnetic field and Flux lines of magnetic field
Figure 6 illustrates Isometric view of Deion plates.
Figure 7 illustrates Front View and Side view Deion plates.
Figure 8a, 8b and 8c illustrate staggered profile of the deion plate arrangement.
Figure 9 illustrates arc chute housing arrangement.
Figure 10 illustrates arc characteristics.
Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may have not been drawn to scale. For example, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure.

Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.
DETAILED DESCRIPTION OF THE INVENTION
The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention- Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention are provided for illustration purpose only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.

It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise.
By the term "substantially" it is meant that the recited characteristic, parameter, or value need not be achieved exactly, but that deviations or variations, including for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those of skill in the art, may occur in amounts that do not preclude the effect the characteristic was intended to provide.
The present invention relates to an arc plate arrangement comprising deion plates for use in DC/AC circuit breakers with higher arc pulling force .The present invention proposes a Deion plate keeping in mind the reduction of Arcing time & the let through of the circuit breaker in turn enhance the SC breaking capacity of the circuit breaker. The designed arc splitter is beneficial in reducing arcing time & let through of the circuit breaker without affecting the performance of the switch.
The walls of the arc chute are shaped in such a way that the arc is not only forced into the close proximity with them, but also driven in to a serpentine channel. The lengthening of the arc and simultaneous increase in the voltage drop per unit length soon led to a high arc voltage, and a high arc resistance. This changes the system power factor so that the instantaneous value of the supply voltage as the current approaches zero is much below its peak value.

Finally, the high value of resistance represented by the arc influences the damping of the TRV oscillation such that the amplitude factor is reduced almost to unity. The arc chute comprises first side wall having a V cut and a second wall also having a V cut located spaced apart from each other and having appropriate space disposed in between for securing deion plates. Such arc chute wall is illustrated by way of figure 9.
Fig 2 discloses that when the splitter is made of iron, the magnetic field created by the arc is deformed. Iron being more permeable than the air, the lines of field tends to be confined inside the splitters, the electromagnetic force that the arc undergoes propel it towards the quenching chamber.
The present invention describes the Deion plates that has V-shaped cutting. Fig 3 explains the particular arrangement which is suppose to increase the magnitude and the range of the magnetic forces.
Table 1:

Parameter Profile A Profile B
SC breaking current 10000 A 10000 A
Force coupling 4.1757 N 12.24 N
between electrical
arc & ferromagnetic
plate

Table 1 shows that profile B having higher Force coupling between electrical arc & ferromagnetic plate than profile A, hence profile B with V-shaped cutting shows higher arc pulling force.
Also profile B has a single V-shaped cut whereas in case of profile A three different segments are present.
The fig 4 discloses the force versus arc position plot.
Fig 5 discloses the distribution of electromagnetic field and flux lines of magnetic field.
As we move inward towards the vortex of the V shape cut the force interaction between the ferromagnetic plate and arc keep on increasing.
Analytical relationship -Force coupling between Electric Arc and ferromagnetic plate F= (μr-l) /a (μr+l)*lΛ2*10Λ-7 (N)
The figures 6 and 7 disclose the different views of the present Deion plate (1). Deion plate (1) comprises an inward substantially V-shaped cut profile (2) which comprises slot (3). Referring to figures 8a and 8b the plates (1) are staggered such that the consecutive plates are arranged in opposite sense. The staggered deion plates (1) form a zig-zag path (4) for the arc to follow and elongate. The staggering of the slots (3) provide for the strongest magnetic field. Referring to figure 9, the arc chute housing (5) comprises walls (6) which has V cuts (7) which force the arc into the channel of the V cut of the deion plate.

Referring to figure 10 plotting a resistance line The magnitude of Ae determines the inductive voltage and thereby the rate of change of current To the right of point 1, Ae is negative ,thus the current will decrease and approach point l.To the left of point 'l' , Ae is positive and hence this will increase the current and hence again reach point '1' , hence this point represents a stable burning point of the arc .
Examination of point '2' shows that to the left of point '2' there is steadily negative Ae which gives a steady decrease of current until zero. This therefore is condition for the extinction of the arc. However to the right of point '2' Ae is positive and the current increases and thus has no tendency of coming to point '2' which unlike point '1' is unstable for the maintenance of arc.
Lengthening of the arc has the effect of raising the arc characteristics so that it lies above the resistance line. Progressive lengthening of arc is a basic requirement of D.C. circuit breakers. Rising of arc characteristics helps in the interruption level. Moreover the loss of energy increases with increasing length of arc and more power will be required to maintain the arc.
Features:
1) Enhancing the short circuit breaking capacity of circuit breaker.
2) Improved short-circuit performance of the circuit breaker.

3) There is considerable
a) Increase in pull force (Force coupling between
electric arc and ferromagnetic plate)
b) The lengthening of arc (i.e. because of the unique
V-shaped cutting)
helps in reducing the arcing time.

WE CLAIM:
1. A deion plate arrangement for use in circuit
breakers, said arrangement comprising :
plurality of deion plates; said each deion plate being staggered in proximity to the other deion plate;
wherein said each deion plate of the staggered deion plates comprising a substantially V-shaped modular profile having an inward cut and said each deion plate being arranged in opposite sense to the next deion plate located in its proximity
whereby such arrangement providing a substantially non-linear path adapted to increase the magnitude and the range of the magnetic forces and reducing the arcing time.
2. Arrangement as claimed in claim 1 wherein said Deion plate is made of iron.
3. Arrangement as claimed in claim 1 wherein said V-shaped profile having inward cut towards the vortex of the V shape cut, the force interaction between the ferromagnetic plate and arc keep on increasing.

4. Arrangement as claimed in claim 1 wherein said non-linear path is preferably a zig-zag path providing elongation of the arc.
5. Arrangement as claimed in claim 1 adapted to be used in AC/DC circuit breakers.
6. An arc chute arrangement for use in circuit breakers, said arrangement comprising :
a first side wall having a substantially V-shaped
cut profile;
a second side wall in proximity to said first
wall, said second wall having a substantially V-
shaped cut profile;
deion plate arrangement secured between said first
wall and said second wall; said plate arrangement
comprising:
plurality of deion plates; said each deion plate
being staggered in proximity to the other deion
plate;
wherein said each deion plate of the staggered deion plates comprising a substantially V-shaped modular profile having an inward cut and said each deion plate being arranged in opposite sense to the next deion plate located in its proximity
whereby such arrangement providing a substantially non-linear path adapted to increase the magnitude and the range of the magnetic forces and reducing the arcing time.

7. Arrangement as claimed in claim 6 wherein said deion plate is made of iron.
8. Arrangement as claimed in claim 6 wherein said non-linear path is preferably a zig-zag path providing elongation of the arc.
9. Arrangement as claimed claim 6 is a AC/DC circuit breaker.
10. Arrangement as claimed in claim 6 wherein said wall of the arc chute comprising substantial V cut for driving the arc into the cut of the deion plate.
11. A circuit breaker comprising an arc chute arrangement as claimed in claims 6 to 10.
12. A circuit breaker comprising a deion plate arrangement as claimed in claims 1 to 5.
13. A deion plate arrangement for use in circuit breakers as herein described and illustrated with reference to the accompanying drawings.
14. An arc chute arrangement for use in circuit breakers as herein described and illustrated with reference to the accompanying drawings.

15. A circuit breaker as herein described and illustrated with reference to the accompanying drawings.