Claims:
1. A current sensor to sense a branch current in a branch wire serviced by an associated circuit breaker and determine the sensed currents, the current sensor comprising:
one or more first windings to measure the branch current, and provide a first output indicative of the branch current in the branch wire;
at least one iron core having one or more second windings to measure the branch current, and provide a second output indicative of the branch current in the branch wire; and
a controller configured to determine, based on the first and second outputs, a phase power representative of the power drawn by the branch wire.

2. The current sensor as claimed in claim 1, wherein the controller is integrated in a printed circuit board (PCB) of the current sensor.

3. The current sensor as claimed in claim 1, wherein the controller further comprises any or combination of an analog signal conditioning circuit, an analog-to-digital converter, and a wireless data transmitter.

4. The current sensor as claimed in claim 1, wherein the one or more first windings and the iron core having the second windings are placed in an enclosure with dielectric isolation.

5. The current sensor as claimed in claim 1, wherein a power supply is generated from a primary current along with the iron core having the second windings.

6. The current sensor as claimed in claim 1, wherein when the primary current flows through a bus bar, the first windings generates/provides an output voltage proportional to the primary current, which is converted, by the controller, into a digital form and then transmitted through an antenna coupled with the controller.

7. The current sensor as claimed in claim 1, wherein when the primary current flows through a bus bar, the iron core having the second winding generates/provides a step down current proportional to the primary current, which is rectified, by a rectifier, and used, by a converter, for power supply generation.

8. The current sensor as claimed in claim 1, wherein the current sensor is characterized in that having the controller configured to transmit the phase power representative of the power drawn by the branch wire wirelessly.

9. The current sensor as claimed in claim 1, wherein the current sensor is a Rogowski coil.

10. A method for sensing a branch current in a branch wire serviced by an associated circuit breaker and determining the sensed currents, the method comprising the steps of:
measuring, by one or more first windings of a current sensor, the branch current, and provide a first output indicative of the branch current in the branch wire;
measuring, by at least one iron core having one or more second windings of the current sensor, the branch current, and provide a second output indicative of the branch current in the branch wire; and
determining, by a controller, from the first output and the second output, a phase power representative of the power drawn by the branch wire; and
transmitting wirelessly, by an antenna of the controller, the phase power representative of the power drawn by the branch wire, to a fault detection system.

, Description:
TECHNICAL FIELD
[0001] The present disclosure relates to field of current sensor, and more specifically relates to a wireless current sensor for circuit breaker to sense a branch current in a branch wire serviced by an associated circuit breaker and transmit the sensed currents in wired or wireless manner.

BACKGROUND
[0002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[0003] The modern power system deals with huge power network and huge numbers of associated electrical equipment. During short circuit fault or any other types of electrical fault these equipment as well as the power network suffer a high stress of fault current in them which may damage the equipment and networks permanently. For saving these equipment and the power networks the fault current should be cleared from the system as quickly as possible. Again after the fault is cleared, the system must come to its normal working condition as soon as possible for supplying reliable quality power to the receiving ends. In addition to that for proper controlling of power system, different switching operations are required to be performed. So for timely disconnecting and reconnecting different parts of power system network for protection and control, there must be some special type of switching devices which can be operated safely under huge current carrying condition. During interruption of huge current, there would be large arcing in between switching contacts, so care should be taken to quench these arcs in circuit breaker in safe manner. The circuit breaker is the special device which does all the required switching operations during current carrying condition.
[0004] A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current, typically resulting from an overload or short circuit. Its basic function is to interrupt current flow after a fault is detected. The circuit breaker is an automatic device for stopping the flow of current in an electric circuit as a safety measure. The Circuit breakers monitor the electrical circuit for the presence of current or other electrical conditions. The circuit breakers interrupt the electrical circuit, in particular in the case of short circuits or overcurrent which exceed previously stipulated current values. According different criteria there are different types of circuit breaker. Air circuit breaker, oil circuit breaker, SF6 circuit breaker, Vacuum circuit breaker are the examples of the circuit breakers. The air circuit breaker is kind of circuit breaker which operates in air at atmospheric pressure.
[0005] The modern circuit breakers comes with microprocessor based electronics trip unit, the electronic trip units that not only provide overcurrent protection, but also comprehensive metering and extended protective relaying. The intelligent trip units can communicate all this information to displays at the breaker or at remote locations. A number of different types of measurement devices may be utilized to detect or monitor current signals. For example, measurement devices are typically integrated into utility meters in order to monitor the current on one or more phases of an electrical power signal. In conventional devices, current transformers, shunts, and Hall Effect transducers are traditionally used to monitor current signals. More recently, Rogowski coils have been utilized to monitor current signals. With a Rogowski coil, current flowing through a conductor generates a magnetic field that induces a voltage in the coil. Using the voltage output signal of the coil, current conditions within the conductor can be calculated.
[0006] The modern circuit breaker can include a Rogowski coil in a sensor unit has voltage induced by a conductor surrounded by the Rogowski coil. The voltage is integrated to represent current which is converted to digital data representing current in the conductor. The voltage signal from the Rogowski wired to trip unit through circuit breaker. The voltage signal from the Rogowski wired to trip unit through circuit breaker.
[0007] However in the circuit breakers the electronics trip unit senses the fault current based on voltage signal from Rogowski coil and gives command to flux shift device. The flux shift device operates the breaker mechanism and breaker gets open to clear the fault. All the time the breaker operation is completely dependent on Rogowski output voltage. Further if the wire between Rogowski and release gets cut due to any reason, the voltage signals will not reach to trip unit and hence the circuit breaker will not clear the fault. Furthermore in case of high temperature environment there is possibility of damage to the wire harness insulation which may lead to shorting of the output signals. To prevent such incidents, it would be advantageous to have a wireless transmission of the current.
[0008] Whereas there is certainly nothing wrong with existing techniques or circuit breakers used for overcurrent protection, nonetheless, there still exist a need to provide an efficient, effective, reliable, and improved current sensors for current measurement and wired/wireless transmission of the current. Further, there exists a need of a system or circuit breaker with high measurement accuracy as compared to conventional system.
[0009] All publications herein are incorporated by reference to the same extent as if each individual publication or patent application were specifically and individually indicated to be incorporated by reference. Where a definition or use of a term in an incorporated reference is inconsistent or contrary to the definition of that term provided herein, the definition of that term provided herein applies and the definition of that term in the reference does not apply.
[00010] In some embodiments, the numbers expressing quantities of ingredients, properties such as concentration, reaction conditions, and so forth, used to describe and claim certain embodiments of the invention are to be understood as being modified in some instances by the term “about”. Accordingly, in some embodiments, the numerical parameters set forth in the written description and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, the numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of some embodiments of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as practicable. The numerical values presented in some embodiments of the invention may contain certain errors necessarily resulting from the standard deviation found in their respective testing measurements.
[00011] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[00012] The recitation of ranges of values herein is merely intended to serve as a shorthand method of referring individually to each separate value falling within the range. Unless otherwise indicated herein, each individual value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g. “such as”) provided with respect to certain embodiments herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed. No language in the specification should be construed as indicating any non-claimed element essential to the practice of the invention.
[00013] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all groups used in the appended claims.

OBJECTS OF THE INVENTION
[00014] An object of the present disclosure is to provide a wireless current sensor for circuit breaker.
[00015] Another object of the present disclosure is to provide to a wireless current sensor for air circuit breaker to sense a branch current in a branch wire serviced by an associated circuit breaker.
[00016] Another object of the present disclosure is to provide a PCB Rogowski coil sensor for current sensing to achieve very good linearity for wide measurement range at a very low system cost.
[00017] Another object of the present disclosure is to provide a PCB Rogowski coil with inbuilt signal conditioning and transmitting circuit.
[00018] Another object of the present disclosure is to provide inbuilt electronics circuit for current measurement and wireless transmission.

SUMMARY
[00019] The present disclosure relates to field of circuit breaker, and more specifically relates to a wireless current sensor for air circuit breaker to sense a branch current in a branch wire serviced by an associated circuit breaker and determine the sensed currents.
[00020] Embodiments of the present disclosure provide an efficient, effective, reliable, improved circuit breaker that uses current sensor for current measurement and wireless transmission of the current. Further, the present invention according to the embodiments provides/gives circuit breaker with high measurement accuracy as compared to conventional system.
[00021] Accordingly, an aspect of the present disclosure relates to a current sensor (hereinafter interchangeably referred as PCB Rogowski coil sensor or Rogowski coil sensor or coil sensor) to sense a branch current in a branch wire serviced by an associated circuit breaker and determine the sensed currents. In an aspect, the current sensor can include one or more first windings, at least one iron core and a controller. In another aspect, one or more first windings can measure the branch current, and to provide a first output indicative of the branch current in the branch wire. In another aspect, the iron core having one or more second windings can measure the branch current, and to provide a second output indicative of the branch current in the branch wire. In another aspect, the controller can determine based on the first and second outputs, a phase power representative of the power drawn by the branch wire.
[00022] In an aspect, the controller can be integrated in a printed circuit board (PCB) of the current sensor.
[00023] In an aspect, the controller can include at least any or combination of an analog signal conditioning circuit, an analog-to-digital converter, and a wireless data transmitter.
[00024] In an aspect, the one or more first windings and the iron core having the second windings can be placed in an enclosure with dielectric isolation.
[00025] In an aspect, a power supply can be generated from a primary current along with the iron core having the second windings.
[00026] In an aspect, the primary current flows through a bus bar, the first windings can generate/provide an output voltage proportional to the primary current, which is converted, by the controller, into a digital form and then transmitted through an antenna coupled with the controller.
[00027] In an aspect, the primary current flows through a bus bar, the iron core having the second winding can generate/provide a step down current proportional to the primary current, which is rectified, by a rectifier, and used, by a converter, for power supply generation.
[00028] In an aspect, the current sensor having the controller can transmit the phase power representative of the power drawn by the branch wire wirelessly. In another aspect, the current sensor can be a Rogowski coil.
[00029] An aspect of the present disclosure relates to a method for sensing a branch current in a branch wire serviced by an associated circuit breaker and determining the sensed currents. The method can include the steps of: measuring, by at least one of a current sensor, the branch current, and provide a first output indicative of the branch current in the branch wire; measuring, by one or more iron core having one or more second windings of the current sensor, the branch current, and to provide a second output indicative of the branch current in the branch wire; determining, by a controller, from the first output and the second output, a phase power representative of the power drawn by the branch wire; and transmitting wirelessly, by an antenna of the controller, the phase power representative of the power drawn by the branch wire, to fault detection system.
[00030] In contrast to the conventional circuit breakers, the present disclosure provides a current sensing using a Rogowski coil sensor having PCB to achieve very good linearity for wide measurement range at a very low system cost. Further, in contrast to the existing circuit breakers, the present invention provides high measurement accuracy as compared to conventional system because of the value of current is first measured and then transmitted to trip unit where in conventional system the output voltage of the CT is transmitted first and then measured by trip unit.
[00031] Further, in contrast to the existing circuit breakers, the present invention include inbuilt Electronics circuit for current measurement & wireless transmission The present invention is also sense a branch current in a branch wire serviced by an associated circuit breaker and determine the sensed currents.
[00032] Various objects, features, aspects and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

BRIEF DESCRIPTION OF THE DRAWINGS
[00033] The accompanying drawings are included to provide a further understanding of the present disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure. The diagrams are for illustration only, which thus is not a limitation of the present disclosure, and wherein:
[00034] FIG. 1A illustrates a first side of a proposed coil, in accordance with an exemplary embodiment of the present disclosure.
[00035] FIG. 1B illustrates a second side of a proposed coil, in accordance with an exemplary embodiment of the present disclosure.
[00036] FIG. 2 illustrates a block diagram of proposed invention, in accordance with an exemplary embodiment of the present disclosure.
[00037] FIG. 3 illustrates a block diagram of ACB trip unit with Breaker, in accordance with an exemplary embodiment of the present disclosure.
[00038] FIG. 4 illustrates a flow diagram of proposed invention, in accordance with an exemplary embodiment of the present disclosure.

DETAILED DESCRIPTION
[00039] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such detail as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the scope of the present disclosure as defined by the appended claims.
[00040] If the specification states a component or feature “may”, “can”, “could”, or “might” be included or have a characteristic, that particular component or feature is not required to be included or have the characteristic.
[00041] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[00042] Exemplary embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments are shown. These exemplary embodiments are provided only for illustrative purposes and so that this disclosure will be thorough and complete and will fully convey the scope of the invention to those of ordinary skill in the art. The invention disclosed may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Various modifications will be readily apparent to persons skilled in the art. The general principles defined herein may be applied to other embodiments and applications without departing from the scope of the invention. Moreover, all statements herein reciting embodiments of the invention, as well as specific examples thereof, are intended to encompass both structural and functional equivalents thereof. Additionally, it is intended that such equivalents include both currently known equivalents as well as equivalents developed in the future (i.e., any elements developed that perform the same function, regardless of structure). Also, the terminology and phraseology used is for the purpose of describing exemplary embodiments and should not be considered limiting. Thus, the present invention is to be accorded the widest scope encompassing numerous alternatives, modifications and equivalents consistent with the principles and features disclosed. For purpose of clarity, details relating to technical material that is known in the technical fields related to the invention have not been described in detail so as not to unnecessarily obscure the present invention.
[00043] Each of the appended claims defines a separate invention, which for infringement purposes is recognized as including equivalents to the various elements or limitations specified in the claims. Depending on the context, all references below to the "invention" may in some cases refer to certain specific embodiments only. In other cases it will be recognized that references to the "invention" will refer to subject matter recited in one or more, but not necessarily all, of the claims.
[00044] All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., “such as”) provided with respect to certain embodiments herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed. No language in the specification should be construed as indicating any non-claimed element essential to the practice of the invention.
[00045] Various terms as used herein are shown below. To the extent a term used in a claim is not defined below, it should be given the broadest definition persons in the pertinent art have given that term as reflected in printed publications and issued patents at the time of filing.
[00046] The present disclosure relates to field of circuit breaker, and more specifically relates to a wireless current sensor for air circuit breaker to sense a branch current in a branch wire serviced by an associated circuit breaker and determine the sensed currents.
[00047] Embodiments of the present disclosure provide an efficient, effective, reliable, improved circuit breaker that uses current sensor for current measurement and wireless transmission of the current. Further, the present invention according to the embodiments provides/gives circuit breaker with high measurement accuracy as compared to conventional system.
[00048] Accordingly, an aspect of the present disclosure relates to a current sensor (hereinafter interchangeably referred as PCB Rogowski coil sensor or Rogowski coil sensor or coil sensor) to sense a branch current in a branch wire serviced by an associated circuit breaker and determine the sensed currents. In an aspect, the sensor can include one or more first windings, at least one iron core and a controller. In another aspect, one or more first windings can measure the branch current, and to provide a first output indicative of the branch current in the branch wire. In another aspect, the iron core having one or more second windings can measure the branch current, and to provide a second output indicative of the branch current in the branch wire. In another aspect, the controller can determine based on the first and second outputs, a phase power representative of the power drawn by the branch wire.
[00049] In an aspect, the controller can be integrated in a printed circuit board (PCB) of the current sensor.
[00050] In an aspect, the controller can include at least any or combination of an analog signal conditioning circuit, an analog-to-digital converter, and a wireless data transmitter.
[00051] In an aspect, the one or more first windings and the iron core having the second windings can be placed in an enclosure with dielectric isolation.
[00052] In an aspect, a power supply can be generated from a primary current along with the iron core having the second windings.
[00053] In an aspect, the primary current flows through a bus bar, the first windings can generate/provide an output voltage proportional to the primary current, which is converted, by the controller, into a digital form and then transmitted through an antenna coupled with the controller.
[00054] In an aspect, the primary current flows through a bus bar, the iron core having the second winding can generate/provide a step down current proportional to the primary current, which is rectified, by a rectifier, and used, by a converter, for power supply generation.
[00055] In an aspect, the current sensor having the controller can transmit the phase power representative of the power drawn by the branch wire wirelessly. In another aspect, the current sensor can be a Rogowski coil.
[00056] An aspect of the present disclosure relates to a method for sensing a branch current in a branch wire serviced by an associated circuit breaker and determining the sensed currents. The method can include the steps of: measuring, by at least one of a current sensor, the branch current, and provide a first output indicative of the branch current in the branch wire; measuring, by one or more iron core having one or more second windings of the current sensor, the branch current, and to provide a second output indicative of the branch current in the branch wire; determining, by a controller, from the first output and the second output, a phase power representative of the power drawn by the branch wire; and transmitting wirelessly, by an antenna of the controller, the phase power representative of the power drawn by the branch wire, to fault detection system.
[00057] In contrast to the conventional circuit breakers, the present disclosure illustrates current sensing using a PCB Rogowski coil sensor to achieve very good linearity for wide measurement range at a very low system cost. Further, in contrast to the existing circuit breakers, the present invention provides high measurement accuracy as compared to conventional system because of the value of current is first measured and then transmitted to trip unit where in conventional system the output voltage of the CT is transmitted first and then measured by trip unit.
[00058] Further, in contrast to the existing circuit breakers, the present invention include inbuilt Electronics circuit for current measurement & wireless transmission The present invention is also sense a branch current in a branch wire serviced by an associated circuit breaker and determine the sensed currents.
[00059] FIG. 1A illustrates a first side of a proposed coil, in accordance with an exemplary embodiment of the present disclosure. In an aspect, the present invention can measure currents with high di/dt, by using Rogowski coil current transducers that are used for switchgears. In another aspect, the transducer can measure large currents without saturation problems, due to the absence of a magnetic core. In another aspect, the present invention can be based on PCB Rogowski coil 100 with inbuilt signal conditioning and transmitting circuit.
[00060] In an embodiment, the proposed coil 100 can include Rogowski winding tracks 102, signal amplifier and transmitter 104 and transmitting antenna 106.
[00061] In an embodiment, the proposed coil 100 can include PCB having windings tracks 102. In an exemplary embodiment, the windings tracks 102 can be designed in such way that to get 500mv at rated current.
[00062] As shown in FIG. 1A, the output of the Rogowski winding tracks 102 can be connected to the small electronics circuit integrated in to the same PCB. The electronics circuit can include Analog signal conditioning circuit and analog to digital converter in one section where the other section consist of wireless data transmitter. The electronics circuit can have self-power on option to hence no external power supply is required
[00063] FIG. 1B illustrates a second side of a proposed coil, in accordance with an exemplary embodiment of the present disclosure. In an embodiment, the second side of the proposed coil 100 can include iron core and windings 152 and a power supply section 154. As shown in FIG.1B, the iron core 152 can be mounted the windings of Iron core. The winding of iron core can be designed to get 1A output at rated current. In an exemplary embodiment, the power supply section 154 can be designed to get 5V Supply to electronics circuit.
[00064] FIG. 2 illustrates a block diagram of proposed invention, in accordance with an exemplary embodiment of the present disclosure. The block diagram can include signal conditioning 204, A/D converter 206, digital data transmitter 208, iron core CT o/p 210 and burden resistor and rectifier 212 and filter and dc to dc converter power supply 214.
[00065] In an embodiment, the output of the Rogowski 202 can be connected to Analog signal conditioning circuit 206. The signal conditioning circuit 206 can be connected to the analog to digital converter 206 and the A/D converter 206 can be connected to the digital data transmitter 208.
[00066] In an embodiment, the Rogowski PCB 202 and Iron Core CT 210 can be placed in same enclosure with dielectric isolation. In another embodiment, the supply can be generated from the primary current with Iron core CT 210. When primary current flows through a bus bar, the Rogowski 202 gives output voltage proportional to primary current. This voltage is converted in to digital by A/D converter form 206 and the digital can be transmitted through antenna 216. The iron CT 210 can give step down current proportional to primary current. This current is rectified by using the burden resistor and rectifier 212 and used for power supply generation.
[00067] FIG. 3 illustrates a block diagram of ACB trip unit with Breaker, in accordance with an exemplary embodiment of the present disclosure. FIG. 3 illustrates the general interfacing of all modules necessary to perform Protection through smart breaker in electrical distribution system.
[00068] In an embodiment, the block diagram can include CTs 118-1 118-2 and 118-3, a current bus bar 114, release 304, power supply 302, flux shift device (FSD) 306, alarm or LED indicator 310 and breaker 308.
[00069] In an embodiment, the wireless current transformer (CTs) 118-1, 118-2 and 118-3 (hereinafter collectively referred as 118) installed at respective Bus bars 114 to measure the current and transmit though wireless protocol. A Unique Address can be assigned to each wireless CT 118. The release 304 can be also called as Trip unit that act as a receiver. The release 304 can receive the current information from CTs 118 and display it on a display module 310. As per input parameter like currents and voltages the trip unit can show the metering value on the display module. The display module can include an alarm or LED indicator. In unhealthy condition the release 304 can give/ provide alarm signal to user with the help of indication devices. In case of fault current it gives trip command to the breaker 308 to clear the fault. This wireless feature gives flexibility of placement of CT 118 anywhere on the bus bar.
[00070] FIG. 4 illustrates a flow diagram of proposed invention, in accordance with an exemplary embodiment of the present disclosure.
[00071] At step 402, initialized all modules and peripherals.
[00072] At step 404, scheduler starts to execute the all task with priority.
[00073] At step 406, start the wireless receiver, establish the connection with transducers.
[00074] At step 408, monitor the data registers where current measurement values are stored.
[00075] At step 410, the trip unit detects the fault current.
[00076] At step 412, reset the fault LED.
[00077] At step 414, start trip timer and give the trip signal to FSD once timer finish.
[00078] In another embodiment of the coil includes a substantially greater number of sensors. In this manner, a finer granularity of the location of the current sensor and/or the configuration of the loop may be determined.
[00079] In another embodiment a conductive based core, such as a ferrite core, may be used as the current transformer. In addition, the current transformer may be a solid core or a split core current transformer.
[00080] In another embodiment, the Rowogski coils may omit the sensors if desired. A plurality of lengths of Rogowski coil may be combined together to form a larger loop that is more suitable for encircling larger conductive conductor regions and/or encircling the same conductor a plurality of times for increased sensitivity. In this case, a first end of a first Rogowski coil is attached to a second end of a second Rogowski coil using a coupling structure. Preferably, the conductor of the first Rogowski coil is electrically connected to the conductor of the second Rogowski coil, preferably through use of the coupling structure. The second end of the first Rogowski coil and the first end of the second Rogowski coil are coupled together thus forming at least one loop around a conductor to be measured. In this manner, a longer Rogowski coil may be readily assembled from two or more shorter Rogowski coils.
[00081] In another embodiment, a picture may be taken of the assembled Rogowski coil encircling the conductor, such as by using a mobile phone. The picture may be used by a computer program to analyze the relative location of the sensors to assist in the calibration of the sensors. One or more of the parameters of a module may be updated based upon the picture. In some cases, multiple loops around the same conductor may be readily determined.
[00082] It is to be understood that the claims are not limited to the precise configuration and components illustrated above. Various modifications, changes and variations may be made in the arrangement, operation and details of the systems, methods, and apparatus described herein without departing from the scope of the claims.
[00083] The foregoing description of the specific embodiments will so fully reveal the general nature of the invention that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation.
[00084] It should be apparent to those skilled in the art that many more modifications besides those already described are possible without departing from the inventive concepts herein. Moreover, in interpreting both the specification and the claims, all terms should be interpreted in the broadest possible manner consistent with the context. In particular, the terms “comprises” and “comprising” should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, or utilized, or combined with other elements, components, or steps that are not expressly referenced. Where the specification claims refers to at least one of something selected from the group consisting of A, B, C ….and N, the text should be interpreted as requiring only one element from the group, not A plus N, or B plus N, etc. The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the scope of the appended claims.
[00085] While embodiments of the present disclosure have been illustrated and described, it will be clear that the disclosure is not limited to these embodiments only. Numerous modifications, changes, variations, substitutions, and equivalents will be apparent to those skilled in the art, without departing from the scope of the disclosure, as described in the claims.
[00086] In the description of the present specification, reference to the term "one embodiment," "an embodiments", "an example", "an instance", or "some examples" and the description is meant in connection with the embodiment or example described The particular feature, structure, material, or characteristic included in the present invention, at least one embodiment or example. In the present specification, the term of the above schematic representation is not necessarily for the same embodiment or example. Furthermore, the particular features structures, materials, or characteristics described in any one or more embodiments or examples in proper manner. Moreover, those skilled in the art can be described in the specification of different embodiments or examples are joined and combinations thereof.
[00087] All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive.
[00088] Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.
[00089] The invention is not restricted to the details of the foregoing embodiment(s). The invention extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.
[00090] While the foregoing describes various embodiments of the invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.

ADVANTAGES OF THE INVENTION
[00091] The present disclosure provides a wireless current sensor for air circuit breaker.
[00092] The present disclosure provides a wireless current sensor for air circuit breaker to sense a branch current in a branch wire serviced by an associated circuit breaker.
[00093] The present disclosure provides a PCB Rogowski coil sensor for current sensing to achieve very good linearity for wide measurement range at a very low system cost.
[00094] The present disclosure provides a PCB Rogowski coil with inbuilt signal conditioning and transmitting circuit.
[00095] The present invention provides inbuilt electronics circuit for current measurement and wireless transmission.