CLIAMS:1. An assembly of sensor(s) for sensing current and voltage in a circuit breaker, said assembly comprising:
a self powered current sensor comprises a sensing coil, a magnetic core current transformer for sensing current through a magnetic field of the bus bar;
a voltage sensor;
a sensor box for enclosing said current sensor; wherein said sensor box comprises a cavity with a live clip means for accommodating said voltage sensor;
wherein said assembly isolating said voltage sensor from the live part(s) of said current sensor, thereby sensing the voltage level of said circuit breaker.
2. The assembly as claimed in claim 1, wherein said live clip means are substantially U-shaped.
3. The assembly as claimed in claim 1, wherein said live clip means providing contact between said voltage sensor and the busbar for receiving voltage from the busbar.
4. The assembly as claimed in claim 1, wherein said current sensor and said voltage sensor connected to an electronic processing unit using a connecting means for driving current and voltage level in said circuit breaker.
5. The assembly as claimed in claim 4, wherein said connecting means are wire (s).
6. The assembly as claimed in claim 1, wherein said sensor box having a opening at center for connecting to the busbar.
7. The assembly as claimed in claim 1, wherein said sensing coil is a rogowski winding.
8. The assembly as claimed in claim 1, wherein said sensor box is made up of a plastic.
9. The assembly as claimed in claim 1 and claim 7, wherein said sensing coil is air cored enabling to sense large range of current.
,TagSPECI:TECHNICAL FIELD OF THE INVENTION
The present invention relates generally to circuit breakers. More particularly, present invention provides a current sensor conjunction with voltage sensing module in circuit breakers.
BACKGROUND AND THE PRIOR ART
A circuit breaker is a switch that automatically interrupts flow of electrical current when the rated current is exceeded due to an electrical overload or fault. Typically, a circuit breaker comprises housing, contacts enclosed within the housing, an operating mechanism to operate the contacts, and an arc chute.
The operating mechanism of a circuit breaker primarily consists of two springs, a main spring (or a closing spring) and an opening spring (or a return spring). The main spring is used for closing operation, wherein the spring is held in a charged condition by a closing latch. On releasing the closing latch, the spring releases energy, and this turns ON the circuit breaker. The closing spring generates required driving force to close the
Circuit breaker and charge the opening spring, and energy needed for the vital opening operation is stored in the opening spring when the circuit breaker is in closed position.
A current sensor is a device that detects electrical current (AC or DC) in a wire, and generates a signal proportional to it. The generated signal could be analog voltage, current or even digital output. It can be then utilized to display the measured current in an ammeter or can be stored for further analysis in a data acquisition system or can be utilized for control purpose.
Figs. 1-3 show different views of Self Powered noise reduced compact Current Sensors as disclosed in Patent No:2979/MUM/2011
Patent No :2979/MUM/2011 discloses a self-powered compact current sensor which comprises magnetic cored C.T (No. 12)for powering up the microprocessor based card and air cored rogowski (11) for sensing the current of MCCB arranged in different planes side by side enclosed by two plastic covers (6) as shown in prior art.C.T magnetic core stacks is made of alternated lamination arrangement method for making stacks of magnetic core (for the powering up unit) which are interlockable and sleeved. Rogowski coil is Closed Race-track construction with toroidal compensated winding for noise reduction and quality replication of the signal. Coil is Air cored enabling it to sense large range of Current.
To overcome the disadvantages in prior art(s), present invention provides a sensor which enables the powering up of electronic processing unit, isolation of it from the line, current sensing through Rogowski and voltage sensing through a shunt. Hence the unit is capable of sensing Power.

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 assembly of sensor(s) for sensing current and voltage in a circuit breaker
Another object of the present invention is to provide a self powered compact voltage sensor with noise reduction and cost effective construction
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
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.

In an aspect of the present invention, there is provided an assembly of sensor(s) for sensing current and voltage in a circuit breaker, said assembly comprising:
a self powered current sensor comprises a sensing coil, a magnetic core current transformer for sensing current through a magnetic field of the bus bar;
a voltage sensor;
a sensor box for enclosing said current sensor; wherein said sensor box comprises a cavity with a live clip means for accommodating said voltage sensor;
wherein said assembly isolating said voltage sensor from the live part(s) of said current sensor, thereby sensing the voltage level of said circuit breaker.

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 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.
Figure.1 illustrates the Current Sensor.
Figure.2 illustrates the Exploded View of the Current Sensor
Figure.3 illustrates the Pole sensor arrangement.
Figure 4 illustrates a 3 Phase Microprocessor Release assembly
Figure 5 illustrates the exploded view of Microprocessor Release assembly
Figure 6 illustrates a single enclosed sensor unit with voltage module unit arrangement.
Figure 7 illustrates exploded view for the arrangement of voltage module unit in a sensor box.
Figure 8 illustrates exploded view of full sensor unit
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.
Accordingly, present invention provides a current sensor conjunction with isolated system voltage measurement module.
The present invention discloses a novel current sensor with voltage sensing unit that comprises the following parts:
Sensor(fig. 6) which powers up the electronic card and sensing the current level through bus bar also enables to sense the voltage level of MCCB through shunt(9). The arrangement is made such that voltage sensing unit (9) is isolated from the live parts enclosed in sensor as well as other phases as shown in the fig.5
Arrangement of voltage sensing unit:
Fig 6 shows current sensor which comprises Magnetic cored C.T (11) and air cored rogowski (12) enclosed in plastic covers(6). Separate cavity(8) is created in plastic cover(6) to accommodate voltage sensing unit(9) as shown in fig. 7. This arrangement enables the voltage sensing unit is isolated from all live parts contained by the sensor unit such as magnetic cored C.T winding(11) and rogowski winding(12).
In the microprocessor release each sensor assembly (2) placed in the cavities provided in the release box (1) and isolation is achieved by release box walls (1) and the closing cover (3).
The unit taps voltage through bus bar by live U shaped clip type part (10) which is being directly fitted to plastic box as shown in the fig 6.This component makes contact between bus bar and shunt. Voltage module taps ground from electronic processing unit(4) and sends O/P to the same for further process such as deriving voltage level, communication with the display module.
Constructional features of the present invention are given below;
1) Microprocessor release box cavity (plastic material)
2) Sensor assembly
3) Release box front side closing cover (plastic material)
4) Electronic processing unit
5) Release box top side closing cover (plastic material)
6) Sensor box enclosures (plastic material)
7) Bus bar through which voltage and current is being sensed
8) Cavity to accommodate voltage module in sensor box
9) Voltage measuring unit (shunt)
10) U shaped live clip
11) Rogowski to sense current through bus bar
12) C.T with magnetic core to power up electronic processing unit
Sequence of Assembly of the sensor (Construction):
Step 1: Magnetic core C.T(12) is inserted in right side plastic enclosure (6) as shown in fig 8.Rogowski(11) is placed above the C.T and left side plastic cover is placed above it. Both the enclosures are held together with click fit arrangement.
Step 2: Bus bar passes through the sensor box window
Step 3:Voltage module unit (9) is placed in the cavity(8) of sensor box plastic cover (6)
Step 4: U shaped live clip type component(10) is fitted to the cavity wall (fig 6)
Step 5: Three sensor boxes and electronic processing unit (4) are arranged in release box cavity(1) as fig.5
Step 6: Three Sensors and voltage unit are connected to the electronic card through wires.
Step 7: Release box is closed by front side(3) and top side (5) plastic closing covers.
NOVEL FEATURES:
· Self powered compact voltage sensor with noise reduction and cost effective construction.
· No separate elements / components are used for achieving isolation of voltage sensor.
· Voltage tapped from bus bar passing through sensor.