DESC:FIELD OF THE INVENTION
The present invention relates to indicating the MCCB life on the same display which is used by the MCCB for the setting of ETU (Electronic Trip Unit). Particularly, the invention relates to a system and a method for MCCB life indication.
The display can be integral part of the ETU or externally connected. Each circuit breaker including MCCB has predefined Electrical life and Trip life.
This invention measures the Electrical life and Trip life of the MCCB and displays it in percentage form so as to understand by the end user. If it shows 20% means 20% life is over.

BACKGROUND OF THE INVENTION
A Moulded Case Circuit Breaker (MCCB) is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload, short circuit or Earth Fault. It detects the faults such as overload, short circuit or earth fault by using an Electronic trip Unit (ETU) which is a integral part of the product in modular form. ETU is powered from the current transformers putted on individual phases of the MCCB hence this unit is self powered (It does not required external supply for its working).
The MCCB ETU also contains the display which is used for the Setting of the breaker for various setting of Overload, Short Circuit and earth fault. This invention is related to indicate the life of the MCCB on the same display. The life of the MCCB or any breaker can be categorized as Electrical Life and Trip Life. Here we are counting the electrical operations and trip operations of the MCCB, comparing with the predefined life claimed by the manufacturer and displaying in percentage form on the display without any external supply.
Each ETU have self-power supply where voltage is generated by charging the capacitor using current transformer (CT). This voltage is controlled at defined limit (say 18V) by the controller also called rail voltage. This voltage is used for the controller operation and also for the operation of FSD (flux shift device) which trips MCCB in the event of fault occurs.
When MCCB trips, the rail voltage (18V) drops to zero. By measuring the rate of fall of this voltage, controller takes a decision whether trip occurred or it was normal OFF of MCCB. Also MCCB has external Trip Life Contacts (TAC) fitted within the breaker. It also shows the trip of the MCCB.

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 MCCB life indication on Electronic Trip Unit Display.
A basic object of the present invention is to provide a method for MCCB life indication on Electronic Trip Unit Display.
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 moulded case circuit breaker life indication, the system comprising:
a voltage generation means for generating a voltage;
a controller means for controlling said voltage to a rail voltage, wherein said controller means being adapted to generate a signal, when said breaker trips in faulty condition, therefore switching on a switching means by providing said signal to said switching means;
a flux shift device (FSD) for tripping said moulded case circuit breaker (MCCB) in faulty conditionwhen said switching means provides said signal to said flux shift device, therefore providing a rate of fall of rail voltage;
a electronic trip unit display means
wherein said controller means calculating a trip life count and a electrical life count of said circuit breaker and therefore displaying the same on said display means.
In another object of the present invention, there is provided a method for MCCB Life indication, said method comprising steps of:
generating a voltage using a voltage generation means;
controlling said voltage to a rail voltage using a controller means;
generating a signal using said controller means, when said breaker is trips in faulty condition,
calculating a rate of fall of said rail voltage by providing said signal obtained form said controller means to a flux shift device for tripping said circuit breakerwhen said switching means provides said signal to said flux shift device, therefore providing a rate of fall of rail voltage,
storing a value corresponding to said rate of fall of said rail voltage and a trip signal provided form a trip alarm contact in said controller means
providing a trip life count of said circuit breaker by ANDing said value(s), when said rail voltage is higher than a predefined value, and providing an electrical life count, when said rate of fall of said rail voltage is slower than said pre-defined valve,
displaying said trip life count and said electrical life count on an electronic trip unit display means.
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: 18V discharge through FSD coil using MOSFET
Figure 2: Rate of fall of Rail Voltage (18V)
Figure 3: Detailed architecture of the present invention.
Figure 4: Additional feature in the same invention showing Either MCCB faulty or ETU faulty
Figure 5: Various fault differentiating conditions.
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 and a method for MCCB life indication.
Figure 1 shows the rate of fall of rail voltage. The rail voltage is generated by the ETU by using Current Transformer. The voltage generation circuit can be single phase or three phase. This voltage is controlled at rail voltage (18V) by means of Micro-controller using PWM technology. This can be controlled by Analog circuit also using comparator. When MCCB trips or turns OFF, the rail voltage drops down to zero. If breaker trips by means of any fault i.e. overload, Short Circuit or Earth Fault, the controller generated the pulse which is given at gate of MOSFET as shown in figure 1. The MOSFET turns On and current flows the FSD coil (Figure 1) and capacitor voltage 18V discharges through this coil. Sine coil impedance is very low (approximately 10 Ohm), the rate of fall of 18V is fast. This condition is considered as a trip condition. Due to this current, FSD operated and trips the MCCB.
The MCCB also has the True Position Contacts (TAC) which shows the trip position of the breaker (3). Refer figure 3. The micro-controller calculates the rate of fall of 18V rail voltage (1). If it is faster (9) than the pre-defined value, the micro-controller will then save the status of the FSD MOSFET gate pulse. It will also save the signal from the TAC (3). The ANDing of both the signals A and B (9) will give the Trip count of MCCB. This count is saved in the micro-controller’s memory in milliseconds. In next ON operation of MCCB, this count is compared with the predefined Trip life count of MCCB (which is in thousands) and displayed in the percentage format on the same Display used by MCCB for its setting.
If this rate of fall of 18V( refer figure 2) is slow (8), then micro-controller will save this as electrical life count (6). The count is then compared with the pre-defined electrical life count of MCCB (which is more than 10 thousand) and displays it on the MCCB Display.
Figure 4 shows the additional advantage of the invention. In case if FSD MOSFET gate pulse is not available and still the MCCB is tripping (means TAC contact position is captured) is considered as there is some problem in ETU of MCCB or ETU may be faulty. In another case where TAC contact signal is not present and FSD MOSFET gate pulse is available means there is some problem in MCCB or FSD or MCCB may be faulty. The micro-controller will differentiates these conditions by using logic table in Figure 5 where it notes the A and B and take decision as per their status (status of A and B). If breaker is faulty or ETU is faulty, in such conditions, if Auxiliary supply is available then the Status can be displayed as per table in figure 5 on display.
Advantages:
a. Electrical and trip life of the breaker displayed in percentage form on the display. Easy to understand by the user
b. The same display which is available with MCCB is used for the Display of the percentage life hence minimizing the use of extra display.
c. Only one output signal (TAC signal) is taken from outside hence minimizing the wiring of the ETU.
d. Unique technology (18V voltage fall) is used to detect the electrical life.
e. Dual measurement for Trip Life (FSD gate signal and TAC position) to minimize the error.
f. Display the MCCB faulty status or ETU faulty status using External Voltage Module with same display. ,CLAIMS:1. A system for moulded case circuit breaker life indication, said system comprising:
a voltage generation means for generating a voltage;
a controller means for controlling said voltage to a rail voltage, wherein said controller means isadapted to generate a signal when said breaker trips in faulty condition, therebyswitching on a switching means by providing said signal to said switching means;
a flux shift device (FSD) for tripping said moulded case circuit breaker (MCCB) in faulty conditionwhen said switching means provides said signal to said flux shift device, therefore providing a rate of fall of rail voltage; and
an electronic trip unit display means,
wherein said controller means calculating a trip life count and an electrical life count of said circuit breaker and therefore displaying the same on said display means.
2. The system as claimed in claim 1 further comprising a trip position contact(s) (TAC) for providing a trip signal for said circuit breaker.
3. The system as claimed in claim 1, wherein said controller means calculating said rate of fall of said rail voltage from a value corresponding to said rate of fall of said rail voltage and said trip signal.
4. The system as claimed in claim 3, wherein said controller means ANDing said value(s), when rate of fall of said rail voltage is higher than a predefined value, thereby providing said trip life count of said circuit breaker
5. The system as claimed in claim 1, wherein said trip life count of said circuit breaker is provided to said display means for displaying the same.
6. The system as claimed in claim 1, wherein said controller means provides said electrical life count, when said rate of fall of said rail voltage is slower than said pre-defined valve.
7. The system as claimed in claim 6, wherein said electrical life count is compared with a pre-defined electrical life count of said circuit breaker, therefore displaying said compared electrical life count on said display means.
8. The system as claimed in claim 1, wherein said controller means is a microcontroller.
9. The system as claimed in claim 1, wherein said voltage generation means is single phase or three phase.
10. The system as claimed in claim 1, wherein a pulse width modulation method is used by said controller means for controlling said voltage to said rail voltage.
11. The system as claimed in claim 1, wherein said rail voltage is 18 V.
12. The system as claimed in claim 1, wherein said switching means is MOSFET.
13. A method for MCCB Life indication, said method comprising steps of:
generating a voltage using a voltage generation means;
controlling said voltage to a rail voltage using a controller means;
generating a signal using said controller means, when said breaker is trips in faulty condition,
calculating a rate of fall of said rail voltage by providing said signal obtained form said controller means to a flux shift device for tripping said circuit breakerwhen said switching means provides said signal to said flux shift device, therefore providing a rate of fall of rail voltage,
storing a value corresponding to said rate of fall of said rail voltage and a trip signal provided form a trip alarm contact in said controller means
providing a trip life count of said circuit breaker by ANDing said value(s), when said rail voltage is higher than a predefined value, and providing an electrical life count, when said rate of fall of said rail voltage is slower than said pre-defined valve,
displaying said trip life count and said electrical life count on an electronic trip unit display means.
14. The method as claimed in claim 13, further comprising switching on of a switching means by providing said signal generated from said controller means, when said breaker is tripped in faulty condition.
15. The method as claimed in claim 13, wherein said trip signal is provided by a trip position contact(s) (TAC) of said circuit breaker.
16. The method as claimed in claim 13, wherein said controller means ANDing said trip signal provides from said trip position contact(s) and said signal provides from said flux shift device, when rate of fall of said rail voltage is higher than a predefined value, thereby providing said trip life count of said circuit breaker.
17. The method as claimed in claim 13, wherein said electrical life count is compared with a pre-defined electrical life count of said circuit breaker, therefore displaying said compared electrical life count on said display means.
18. The method as claimed in claim 13, wherein a pulse width modulation method is used by said controller means for controlling said voltage to said rail voltage.

19. The method as claimed in claim 13, wherein said rail voltage is 18 V.