DESC:FIELD OF THE INVENTION
The present invention relates to circuit breakers and in particular to a system for communicating the occurrence of abnormality in its functioning to a user / system in-charge wirelesslywho can then send a corrective command back to the breaker.

BACKGROUND OF THE INVENTION
Circuit breakers include a set of separable main contacts, one of which is usually fixed and one of which is movable for automatically opening upon the occurrence of an overload or short circuit electrical current in the network which the circuit breaker is provided to protect. In addition, electronic molded case circuit breakers have trip units, which are often removeablyinsertable in the circuit breaker case. A trip unit includes a microcontroller and is adapted to automatically open the circuit breaker contacts under certain electrical fault conditions.
Furthermore, it is desirable to be able to communicate the occurrence of such fault conditions of a circuit breaker to the system incharge who can take necessary corrective action. Such conditions may include, without limitation, causes of trips, breaker temperature, phase current magnitudes, system hanging, etc.

OBJECTS OF THE INVENTION
One object of the invention is to overcome the disadvantages/drawbacks of the prior art.
A basic object of the present invention is to provide a system for communicating the occurrence of abnormality in its functioning to a user / system in-charge wirelesslywho can then send a corrective command back to the breaker.
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.
In an aspect of the present invention, there is provided a system for indicating an abnormality in the circuit breaker, the system comprising:
amodule with a SIM card holder;
a power supply unit providing power to the module;
an electronic trip unit having a microcontroller connected to the module;
whereinthemodulesending a command duringa trip or fault in the circuit breaker and receiving command for clearing the fault(s).
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.
Figures 1 and 2 illustrate the system of the present invention.
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 numerals are used to depict the same or similar elements, features and structures.

DETAILED DESCRIPTION OF THE PRESENT 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 system for indicating an abnormality in the circuit breaker.
The system as shown in figure 1 includes a GSM module with a SIM card holder. This module is powered by an external power supply unit and interfaced with the microcontroller of the Electronic Trip Unit. The basic communication is over asynchronous serial line. The data is transmitted bit by bit in a frame consisting of a complete byte. Thus at high level it is viewed as a simple text stream. There areonly two streams - one is from the microcontroller to the GSM module and other is from the GSM module to Microcontroller. Commands are sent as simple text.
Since a byte can arrive to MCU any time from the sender (GSM), suppose if the MCU is busy doing something elsewhere have implemented a interrupt based buffering of incoming data. A buffer is maintained in the RAM of microcontroller to store all incoming characters. There is a function to inquire about the number of bytes waiting in this queue.
Similarly, the end user can send a signal to the EOM (Electrically Operated Mechanism) through power switches(as seen in Fig 2.) which can clear the fault and resume electrical flow. However, if the fault occurs repeatedly, the user is instructed to visit the installation and identify the abnormality.
Features of the present invention:
1. GSM based communication to indicate any abnormal occurrence in the circuit breaker due to electrical fault.
2. GSM based communication can also communicate ‘software hanging’ of the Electronic Trip Unit to the System incharge.
3. The circuit breaker can be controlled via GSM based communication by the system operator from remote location.
4. Since wireless communication is being used, complexity of existing wired installation has been simplified.
5. Cost effective solution is proposed to establish the above. ,CLAIMS:1. A system for indicating an abnormality in the circuit breaker, the system comprising:
amodule with a SIM card holder;
a power supply unit providing power to the module;
an electronic trip unit having a microcontroller connected to the module;
wherein the modulesending a command duringa trip or fault in the circuit breaker and receiving command for clearing the fault(s).
2. The system as claimed in claim 1, wherein the microcontroller and the module communicate through an asynchronous serial communication line.
3. The system as claimed in claim 1, wherein data is transmitted from the module to the microcontroller or microcontroller to module in a frame format.
4. The system as claimed in claim 1, wherein an interrupt based buffering of the incoming data is provided by a buffer withinthe microcontroller which stores all incoming character(s).
5. The system as claimed in claim 1 further comprising a power switch(s) for providing signal for clearing the fault(s).
6. The system as claimed in claim 5, wherein the power switch (s) provides the signal to an electrically operated mechanism for clearing the fault(s).

7. The system as claimed in claim 1, wherein the command is simple text.