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. - A ROTARY CONTACT SYSTEM FOR USE IN SWITCH
DISCONNECTORS
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 rotary contact system particularly for use in Switch Disconnectors. More particularly, the present invention relates to a rotary contact system that is of lighter weight and simple in construction which provides high energy generating high contact opening velocity.
BACKGROUND OF THE INVENTION
At present, the contact system being used in the industry is a sliding contact system consisting of two fixed terminals and moving conductors. These moving contacts are held together in the rotor housing by leaf springs. While operating, the moving contacts slide into the input and output terminals, hence dividing the current into the number of parallel moving contacts. Here, the number and cross-section of moving contacts are determined by the current rating. The repulsion force (Holm's) generated at the contact joints is compensated by the electro-dynamic force (Lorentz Force) generated by pairs of parallel moving contacts.
This contact system has more complicated and heavier rotor construction, consisting of moving contacts, magnetic claddings, leaf springs and hardware if any. This heavier rotor results in lower velocity of the opening of contacts. In order to acquire the required velocity, the energy to be provided by mechanism is high.
In the existing contact system, the moving contacts are present in pairs. For each pair of moving contacts, the contact is made at four places. The repulsion force at these four contacts is electro-dynamically compensated by the pair of parallel moving contacts.
However, electro-dynamic compensation of repulsion force generated at each contact by the U-Loop as on the present invention was not known in the prior art.

In the contact system of the present invention the rotor construction is very simple, consisting of just 2 parts-a rotor and single moving contact.
Moreover the mass and moment of inertia of the rotating body is less which in turn will increase the velocity of the rotor. This decreased mass also results in lower input energy from mechanism thereby drastically reducing the stresses, which leads to compact switch.
Thus there exists a need to provide for a rotary contact system particularly for use in Switch Disconnectors which would be able to provide high contact opening velocity.
The present inventors have found that if the same configuration as illustrated in Fig 1 is considered, for same material of conductors, short-circuit current, surface area and contact force the present contact system has better operating characteristics.
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 a rotary contact system particularly for use in Switch Disconnectors.
Another object of the present invention is to provide high contact opening velocity.
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 of the aspect of the present invention there is provided a rotary contact system for use in switch disconnector, said system comprising:
a rotor means substantially having circular modular profile adapted for rotation, said
rotor means comprising a pair of moving means;
wherein the second moving means is placed substantially reverse of first moving
means;
a first module and a second module, said first module is flanked substantially
diametric to said second module,
wherein said rotor means substantially placed in-between said first and second
module;
said first and second module comprising plurality of components;
wherein said plurality of components of first module and second module are
similar/alike;
said plurality of component of second module is substantially located reverse/inverse
of plurality of component of first module;
said plurality of component of first module and/or second module comprising:
(i) a holder means comprising plurality of slot means adapted to divide the input current in parallel paths;
(ii) a fixed means operatively associated with said holder means adapted to initiate the flow of input current in ON state;
(iii) plurality of energy storing elements , each energy storing element operatively accommodated inside each slot of one of the holder means adapted to divide the input current in parallel paths;

(iv) plurality of rest means , said each rest means is operatively connected with said holder means by each energy storing element adapted to provide contact pressure to the said energy storing elements;
(v) plurality of link means ,said each link means having substantially L-shape and is housed into each rest means to operatively connect with said holder means adapted to divide the input current in parallel paths;
(vi) plurality of pins means adapted to pivot/fix said link means into the holder means, such that said pin means assist the said link means to rotate by an angle and compressing the energy storing elements adapted to provide the required contact pressure.
(vii) plurality of flexible means substantially located parallel to said link means adapted to serve as parallel path to said link means; such that said moving means is in contact with said link means in ON state.
DEATILED DESCRIPTION OF THE INVENTION
The present invention relates to a rotary contact system that is of lighter weight and simple in construction which provides high energy generating high contact opening velocity.
The rotary contact system is for use in switch disconnector.
The system comprising a rotor means substantially having circular modular profile adapted for rotation where the rotor means comprising a pair of moving means where the second moving means is placed substantially reverse of first moving means, a first module and a second module.

The first module is flanked substantially diametric to said second module, the rotor means substantially placed in-between said first and second module.
The first and second module comprising plurality of components and the plurality of components of first module and second module are similar/alike. Further the plurality of component of second module is substantially located reverse/inverse of plurality of component of first module.
The plurality of component of first module and/or second module comprising a holder means comprising plurality of slot means adapted to divide the input current in parallel paths ,a fixed means operatively associated with said holder means adapted to initiate the flow of input current in ON state plurality of energy storing elements where each energy storing element operatively accommodated inside each slot of one of the holder means adapted to divide the input current in parallel paths, plurality of rest means where each rest means is operatively connected with said holder means by each energy storing element adapted to provide contact pressure to the energy storing elements , plurality of link means where each link means having substantially L-shape and is housed into each rest means to operatively connect with the holder means adapted to divide the input current in parallel paths , plurality of pins means adapted to pivot/fix said link means into the holder means , plurality of flexible means substantially located parallel to said link means adapted to serve as parallel path to said link means.
The moving means is in contact with said link means in ON state. The pin means assist the said link means to rotate by an angle and compressing the energy storing elements adapted to provide the required contact pressure.
The flexible means comprising braid means and is made of copper.
The energy storing means comprising spring means and is the compression spring.

The rotor means optionally comprising plurality of deion plate means for better arc extinguishing.
The rest means comprises of the spring rest means adapted to act as an arc runner.
The electro-dynamic compensation of repulsion force generated at each contact by the U-Loop as illustrated in fig 2.
In the contact system of the present invention the rotor construction is very simple, consisting of just 2 parts-a rotor and single moving contact.
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 a side view of the existing contact system.
Figure 2 shows a block diagram of the control circuit according to an embodiment of the present invention.
Figure 3 shows an isometric exploded view of single pole of the contact system of the present invention.
Figure 4 to figure 8 illustrate single pole of the contact system of the present invention during different operating conditions.
Figure 9 shows deion plates used in the single pole configuration of the contact system of the present invention.

Figure 10 shows a complete module of a single pole.
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 the system has been discussed below to describe the way the system occurs. However, such description should not be considered as any limitation of scope of the present system. The structure thus conceived is susceptible of numerous modifications and variations, all the details may furthermore be 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.
A single pole of this rotary contact system as shown in Fig. 3 consists of the following parts:
(i) Fixed terminals (A)
(ii) L-shaped links (B)
(iii) Spring rests (C)
(iv) Flexible Copper Braids (D)
(v) Compression springs (E)
(vi) Rotor Part (F)
(vii) Rotor (G)
(viii) Links holder (H)
(ix) Pivot pins (J)
(x) Deion plates (K.)

When the switch is ON condition as shown in Fig.6, current flows through the input terminal (A) and gets divided into parallel paths. The terminals are attached to copper braids (D). These braids which serve as the parallel paths to L-link (B), are flexible components. Each link is attached to an MS component, spring rest (C). This component serves two purposes:
(i) It acts as a support for the spring and which in turn provides contact pressure.
(ii) It acts as an arc runner
OFF to ON operation:
When the rotor is rotated in anti-clockwise direction from the initial state or OFF condition (Fig. 4) by a mechanism, it rotates and touches the L-links as shown in Fig.5. When further rotated it slides onto the L-links (Fig. 6). The L-Iinks are housed in the links holder H with the help of Pivot pins J. As the links are pivoted with the help of (J), the links are rotated by an angle compressing the spring, providing the required contact pressure.
ON to OFF operation:
Similarly, when the rotor is rotated in clockwise direction from the ON state by a mechanism, it rotates to break the contacts from the initial state as in fig. 7 to the final state in fig. 8. Deion plates (K) can be provided as shown in Fig. 9 for better arc extinguishing. And complete module of a single pole is shown in Fig 10.These are stacked together for multiple pole configurations, like 3 - Pole, 4 - Pole, etc.

Advantages:
• Simple rotor construction to reduce the complexity and weight of rotor which increases the velocity of the rotor, which provides better arcing characteristics for a same input energy.
• Independent electro-dynamic compensation for each repulsion force generated at the contacts.

WE CLAIM:
1. A rotary contact system for use in switch disconnector , said system comprising:
a rotor means substantially having circular modular profile adapted for rotation, said rotor means comprising a pair of moving means; wherein the second moving means is placed substantially reverse of first moving means;
a first module and a second module, said first module is flanked substantially diametric to said second module,
wherein said rotor means substantially placed in-between said first and second module; said first and second module comprising plurality of components;
wherein said plurality of components of first module and second module are
similar/alike;
said plurality of component of second module is substantially located
reverse/inverse of plurality of component of first module;
said plurality of component of first module and/or second module comprising:
(i) a holder means comprising plurality of slot means adapted to divide the input current in parallel paths;
(ii) a fixed means operativeiy associated with said holder means adapted to initiate the flow of input current in ON state;

(iii) plurality of energy storing elements , each energy storing element operatively accommodated inside each slot of one of the holder means adapted to divide the input current in parallel paths;
(iv) plurality of rest means , said each rest means is operatively connected with said holder means by each energy storing element adapted to provide contact pressure to the said energy storing elements;
(v) plurality of link means ,said each link means having substantially L-shape and is housed into each rest means to operatively connect with said holder means adapted to divide the input current in parallel paths;
(vi) plurality of pins means adapted to pivot/fix said link means into the holder means, such that said pin means assist the said link means to rotate by an angle and compressing the energy storing elements adapted to provide the required contact pressure
(vii) plurality of flexible means substantially located parallel to said link means adapted to serve as parallel path to said link means;
such that said moving means is in contact with said link means in ON state.
2. System as claimed in claim 1 wherein said flexible means comprising braid means which is made of copper.
3. System as claimed in claim 1 wherein said energy storing elements comprising spring means which is a compression spring.

4. System as claimed in claim 1 wherein said rotor means optionally comprises plurality of plate means.
5. System as claimed in claim 6 wherein said rotor means is connected with plate means adapted for better arc extinguishing.
6. System as claimed in claim 7 wherein said plate means are deion plate.
7. System as claimed in claim 1 wherein said rest means comprises the spring rest means adapted to act as an arc runner and to provide support to each spring.
8. System as claimed in claim 1 wherein said rotary contact system is a single electric pole contact system.
9. System as claimed in claim 1 wherein said rotary contact system of similar kind are stacked together to form multiple electric pole configuration.
10. A rotary contact system for use in switch disconnector as herein substantially described and illustrated with the accompanying drawings.