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
(Sec section 10 and rule 13)
TITLE OF THE INVENTION
Apparatus for Speed measurement of second contact of a circuit breaker.
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTORS
Abhang Pravin, Rao Sudhendra, Sonjc Ravindra and Mandlik Kalpcsh of Crompton Greaves Ltd, S3 Division, Switchgear Complex, A~3, MIDC, Ambad, Nashik-422010 Maharashtra, India; all 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 mechanics.
Particularly, this invention relates to circuit breakers and apparatus for measurements thereof.
Background of the Invention:
A circuit breaker is a crucial industrial component which protects sensitive material from aberrations in electric supply. Such aberrations may include surges, overload, high current, high voltage. Typically, when any of the regulators or modulators fail to maintain a constant supply, and upon detection of an aberration, a circuit breaker is actuated in order to break the contact completely. Hence, it is essential that a circuit breaker is absolutely fail proof. It is also essential that the actuation mechanism of the circuit breaker is rapid, and acts within the designated defined protocol.
A pair of contacts opens and closes to break or make the circuit. Upon successful detection, it is important this make or break via close or open contacts happen instantaneously. Hence, speed of contact make or break is an important parameter to be observed while testing a circuit breaker. Such a product may fail due to unknown information of speed.
Currently, there is no experimental data relating to measurement of closing and opening speed of second contact of dual motion circuit breaker. Hence, specifying

the same on the product is not possible Manipulation gives only the ideal design value but actual value can not be determined using present setup.
Within the circuit breaker, MCH pipe scissor links are the main moving parts from Upper Terminal side. In order to measure the speed, connection should be taken from any of these components.
Prior Art:
In a single motion circuit breaker a first Contact ('moving contact') which moves
< i
and a second contact ('stationary'contact') which is stationary. Here, measurement of a speed is done by attaching a rotary transducer to 2 phase (rotating) lever, which is coupled to the moving contact via linkages.
In a double motion of a circuit breaker both contacts (moving and upper terminal)move with a certain speed. Now, the same rotary transducer gives the speed of an interrupter, but it is only for the moving contact i.e. the moving side (Lower terminal side).
Currently, other side (upper terminal) speed is only analytically calculated.
Measurement is necessary in order to understand whether the circuit breaker provide the analytically calculated speed. Also, both closing as well as opening speed cannot be measured only by using existing rotary transducer.

US5021648 discloses a motion transducer with a rotatable wheel to measure the linear displacement of the moveable rod by converting linear motion to circular motion.
JP1100838 discloses use of multiple, location sensors to detect the displacement of the position of a closing action of a vacuum breaker.
However, these documents do not disclose about speed measurement of semi-moveable contacts in dual motion circuit breakers.
There is no existing apparatus for obtaining the speed of other side (Upper terminal side).
Figure 1 illustrates an existing Rotary transducer arrangement on the prior art.
Objects of the Invention:
An object of the invention is to obtain speed measurements of an upper terminal side of a circuit breaker.
Another object of the invention is to obtain working speed measurements in order to accurately rate a circuit breaker.
Yet another object of the invention is to increase the safety parameters of a circuit breaker.

Summary of the Invention:
For the purposes of this specification, a second contact' refers to a stationary contact in a single moving circuit breaker and refers to a second moving contact of the double moving circuit breaker. It is the Upper Terminal contact of the circuit breaker.
According to this invention, there is provided an apparatus for measurement of speed of a second contact mounted on a threaded pipe of a circuit breaker device, said apparatus comprising:
a. Transducer adapted to be co-axially fitted in line with said second contact,
said transducer extending out of said threaded pipe;
b. Connection means adapted to connect an operative proximal end of said
transducer to said pipe to arrest its rotary motion; and
c. Bend plate adapted to provide support to said connected transducer and
further adapted to guide said transducer in its operative horizontal direction
along its linear forward-rearward motion for sensing speed of said second
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contact of said circuit breaker.
Typically, said transducer is a linear transducer.
Typically, said connection means is a screwing means adapted to screw transducer to said pipe.

Typically, said apparatus includes a clamping means adapted to clamp said transducer to said bend plate.
Brief Description of the Accompanying Drawings:
Figure 1 illustrates an existing rotary transducer apparatus arrangement of the prior art.
The invention will now be described in relation to the accompanying
drawings, in which:
Figure 2 illustrates the Arrangement of Linear Transducer; and
Figure 3 illustrates the Detailed View of the apparatus.
Detailed Description of the Accompanying Drawings:
Figure 1 illustrates an existing rotary transducer apparatus arrangement of the prior art.
Reference numeral 20 refers to an upper side terminal. Reference numeral 22 refers to a rotary transducer location. Reference numeral 24 refers to a 2-phase lever.
Figure 2 illustrates the Arrangement of Linear Transducer in accordance with this invention.
Figure 3 illustrates the Detailed View of the apparatus of this invention.

According to this invention, there is provided an apparatus (10) for measurement of speed of a second contact. Said second contact may be moving or stationary. A circuit breaker has other moving parts such as Contact holder pipe, scissors and the like.
In accordance with an embodiment of this invention, there is provided a transducer (10) co-axially fitted in line with said second contact (20). There is provided a connection between pipe for measurement and contact holder pipe as shown in Figures 2 and 3 of the accompanying drawings.
Typically, the transducer is a linear transducer.
The Linear Transducer with sliding arm is inserted into the pipe (30).
In accordance with another embodiment of this invention, there is provided a connection means (40) adapted' to connect said transducer to said pipe for restricting motion of said transducer in only a linear direction. Typically, a screw is screwed from one end of a transducer. Same screw is fitted by nut to pipe.
In accordance with another embodiment'of this invention, there is provided a bend plate (50) adapted to provide support to said transducer. Bend plate height is such that transducer can fit inside the plate which means bend plate height is slightly greater than the transducer height. Further, Bend plate is placed in such a way that said transducer remains operatively horizontal. Typically, said transducer should be clamped with the help of said bend plate by bolting arrangement so that the

rotation of transducer is completely restricted. Also, the transducer is to be co-axially fitted inline with the said second contact.
Due to this arrangement accurate speed can be measured.
Due to the embodiment of this invention, only linear motion of a transducer is
possible which will give us the linear speed of other side of an interrupter i.e. of the second contact.
Figures 2 and 3 show the closed condition of a circuit breaker with linear transducer. When circuit breaker 'opens, Contact holder pipe, as shown in the figures, moves which drives transducer and which in turn gives measurement of the speed. Same principle can-be applied to measure the closing speed of an interrupter (second contact side).
According to the apparatus of this invention, speed of other side of an interrupter i.e. of the second moving contact can be measured. The measurement is accurate and provides a safety rating to circuit breakers. Both closing as well as opening speed of the contacts of circuit breakers can be measured using same apparatus and principle. Further, cross checking of design parameters and loopholes in designing of speed parameters can be found but due to actual measurement.

We claim,
1. An apparatus for measurement of speed of a second contact mounted on a
threaded pipe of a circuit breaker.device, said apparatus comprising:
a. Transducer adapted to be; co-axially fitted in line with said second contact,
said transducer extending out of said threaded pipe;
b. Connection means adapted to connect an operative proximal end of said
transducer to said pipe to'arrest its rotary motion; and
c. Bend plate adapted to provide support to said connected transducer and
further adapted to guide said transducer in its operative horizontal direction
along its linear forward-rearward motion for sensing speed of said second
contact of said circuit breaker.
2. An apparatus as claimed in claim 1 wherein, said transducer is a linear
transducer.
3. An apparatus as claimed in claim 1 wherein, said connection means is a
screwing means adapted to screw transducer to said pipe.

4. An apparatus as claimed in claim 1 wherein, said apparatus includes a clamping means adapted to clamp said transducer to said bend plate.