FORM2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10; rule 13)
1. Title of the invention. - AN EXEMPLARY IMPLEMENTATION OF LOAD PROFILE AND THD PROFILE ON ELECTRONIC TRIP UNITS OF CIRCUIT BREAKER USING AN INTUITIVE TOUCHSCREEN BASED 262K COLOR LCD-TFT DISPLAY
2. Applicant(s)

(a) NAME : LARSEN & TOUBRO LIMITED
(b) NATIONALITY : An Indian Company.
(c) ADDRESS : L & T House, Ballard Estate, Mumbai 400 001,
State of Maharashtra, India
3. PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed:

FIELD OF THE INVENTION
The present invention generally relates to Electronic Trip units for circuit breakers. More particularly, the present invention provides improved electronic trip assembly for protection and control of circuit breakers.
BACKGROUND OF THE INVENTION
Touch screens are found in a wide range of applications, from medical and industrial to public access kiosks and retail. For a touch screen integrated into a terminal that is going to be used in a heavy industrial environment, factors may include adequate levels of protection against shock and vibration in addition to resistance to chemicals and cleaning fluids. It is important, therefore, that touch screens used in this type of environment are able to perform in the harshest conditions. In addition to this, a 262K colour LCD-TFT display enhances the visual appearance of the electronic trip unit (ETU).
US20070103835 describes an aspect that comprises a power management control and monitoring system and integrated remotely actuated circuit breaker actuator apparatus that provides a greatly simplified power management control and monitoring system.
US20090050455 provides a touch sensitive control board. In order to increase an ease of operation of a circuit breaker it is provided that, as an operating device for manual actuation of a switching element of the circuit breaker, a touch-sensitive control board is integrated in a housing of the circuit breaker. The touch-sensitive control board provides improved operator control convenience.
In conventional technologies, load profiling & THD (Total Harmonic Distortion) profiling are available on energy meters. This data can also be analyzed using an external device or an HMI. However, the present invention provides a profiling of these parameters on an Electronic Trip unit without the need of plugging in an additional module. The graphical data can be optically zoomed for more precise analysis. The integration time for accumulation of the data is configurable.
The prior art technologies in electronic trip units uses Light Emitting Diode (LED) or Liquid Crystal Display (LCD) for displaying the metering parameters. In addition to the screen, navigation buttons or DIP switches are used for parameterization of the trip units.

OBJECT OF THE INVENTION
An object of the invention is to overcome the drawbacks/disadvantages of the invention.
Another object of the invention is to implement the load profile and THD (Total Harmonic Distortion) profile on Electronic Trip Unit of a circuit breaker using an intuitive touch screen based 262K color LCD-TFT display.
Another object of the invention is to provide a touch screen for efficient user interface integrated on trip unit of circuit breaker.
Another object of the invention is to provide a touch screen which can receive and display data on the same screen thereby replacing conventional keypad or switches as an input device
Another object of the invention is to negate the usage of any external HMI panel or PC interface for efficient monitoring and analyzing of different parameter of the electrical system.
Yet another object of the invention is the touch screen can be used to operate the circuit breakers.
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.
SUMMARY OF THE INVENTION
In accordance with the present aspect of the invention there is provided an intuitive touch screen based 262K color LCD-TFT display for implementation of Load profile and THD profile on electronic trip units of circuit breaker.
In accordance with another aspect of the invention there is provided a touch screen user interface for receiving and displaying data thereby replacing conventional key pad as input device.
In accordance with another aspect of the invention there is provided a touch screen user interface to operate the circuit breaking device.
In accordance with another aspect of the invention there is provided a touch screen specifically displaying different information related to system monitoring and parameterization.

In accordance with another aspect of the invention there is provided a touch screen user interface display the load profile as a graphical representation showing of the variation in the electrical load versus time.
In accordance with another aspect of the invention, there is provided the trip unit that displays the load profile data for last 24hrs on the screen of the trip unit for the analysis of the power viz. active, reactive and apparent Maximum Demand data.
In accordance with another aspect of the invention the trip unit also displays the Total Harmonic Distortion (%) profiles of last 24hrs for the line currents.
In accordance with another aspect of the invention the trip unit can be configured to take necessary measures to provide effective load management and protection of conductor against overheating.
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.
FIG.l shows a front view of Electronic trip unit with touch screen display
FIG. 2 shows screen option for various features like metering, load profile and THD profile
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 aspects 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 aspects 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 aspects 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, in the present invention FIG.1 depicts a typical representation of electronic trip unit for a circuit breaker with an integrated 262k colour TFT display, touch screen display integrated on the trip unit.
Electronic trip assembly for protection and control of circuit breakers comprises a computing means for calculating active power, reactive power, apparent maximum demand data and the like based on load profile. It provides an interfacing means adapted to provide for touch based navigation and providing for load profile data. Interfacing means provides for optical zooming thereby allowing a detailed analysis of said profile. Additionally, interface means is a substantially 262K colour graphical TFT/LCD display. It allows sending and receiving of data on said display means.

Further it is worth noting that the assembly is a self powered unit wherein said interface means and computing means is self powered. It provides for a THD Profiling of upto 32nd Harmonics and displays graphically using a plurality of bar graphs. Computing means is configured to a preset parameters for providing effective load management and protection of a conductor against overheating. Computing means provides for configuring integration time to accumulate data.
An aspect of the present invention includes an electronic trip unit for circuit breaker with an intuitive touch screen based user interface. An electronic trip unit basically used to provide Protection and Control for circuit breaker under fault conditions. The function of protection trip unit is to cause prompt discontinuation of service in presence of a short circuit, or when it starts to operate in any abnormal manner that might cause damage or otherwise interfere with the effective operation of the rest of the system. The interface used for the said trip unit is a touch screen based display. As the touch screen has the ability to display and receive data on the same screen, the conventional keypad or switches as an input device can be replaced.
FIG 2 shows the electronic trip unit with touch screen display. More specifically different information or screens related to system monitoring and parameterization.
Load Profiling is a graphical representation of the variation in the electrical load versus time. A load profile will vary according to customer type (typical examples include residential, commercial and industrial), temperature and holiday seasons.
In the electricity generation sector, a load curve is a chart showing the amount of electricity customer's use over a period of time. Generation companies use this information to plan how much power they will need to generate at any given time. A load duration curve is similar to a load curve. The information is the same but is presented in a different form. These curves are useful in the selection of generator units for supplying electricity.
In an electricity distribution network, the load profile of electricity usage is important to the efficiency and reliability of power transmission. The power transformer or battery-to-grid are critical aspects of power distribution and sizing and modelling of batteries or transformers depends on the load profile. The factory specification of transformers for the optimization of load losses versus no-load losses is dependent directly on the characteristics of the load profile that the transformer is expected to be subjected to. This includes such characteristics as average load factor, utilization factor, and responsibility factor, which can all be calculated based on a given load profile.

Load profiles can be determined by direct metering but on smaller devices such as distribution network transformers this is not routinely done. Instead a load profile can be inferred from customer billing or other data.
The second aspect of the present invention uses the trip unit displays to show the load profile data for last 24hrs on the screen of the trip unit. This information can be used for the analysis of the power viz. active, reactive and apparent Maximum Demand data. In addition to the MD data the trip unit also displays the THD - Total Harmonic Distortion (%) profiles of last 24hrs for the line currents. THD is the measurement of the harmonic distortion present in the source and is computed as the ratio of the sum of the currents of all harmonic components to the current of the fundamental frequency. When a signal passes through a non-ideal, non-linear load, additional content is added at the harmonics of the original frequencies. THD is a measurement of the extent of that distortion. In four wire WYE systems, harmonics may cause a problem with overheating of the neutral wire. The phase wires should also be designed for the increased harmonic current, but since the "triplens" are additive, the problem is especially critical on the neutraf. The third harmonic and other "triplens" (9th, 15th, etc.) are additive. Total Harmonic Distortion is the percentage of all of these additive values in relation to the total load.
Using the present invention the trip unit can be configured to take necessary measures to provide effective load management and protection of conductor against overheating.
Although the aspects herein are described with various specific aspects, it will be obvious for a person skilled in the art to practice the aspects herein with modifications. However, all such modifications are deemed to be within the scope of the claims.
It is also to be understood that the following claims are intended to cover all of the generic and specific features of the aspects described herein and all the statements of the scope of the aspects which as a matter of language might be said to fall there between

WE CLAIM:
1. An improved electronic trip assembly for protection and control of circuit breakers,
said assembly comprising:
a computing means for calculating active power, reactive power, apparent maximum demand data and the like based on load profile;
an interfacing means adapted to provide for a touch based navigation and providing for load profile data.
2. Assembly as claimed in claim 1 wherein said interfacing means providing for optical zooming thereby allowing a detailed analysis of said profile.
3. Assembly as claimed in claim 1 wherein said interface means is a substantially 262K colour graphical TFT/LCD display.
4. Assembly as claimed in claim 1 wherein said interface means allowing sending and receiving of data on said display means.
5. Assembly as claimed in claim 1 wherein said interface means and computing means is self powered.
6. Assembly as claimed in claim 1 providing a THD Profiling of upto 32nd Harmonics.
7. Assembly as claimed in claim 1 wherein said interface means providing for approximately 32 harmonics and displays graphically using a plurality of bar graphs.
8. Assembly as claimed in claim 1 wherein said computing means configured to a preset parameters for providing effective load management and protection of a conductor against overheating.

9. Assembly as claimed in claim 1 wherein said computing means providing for configuring integration time to accumulate data.
10. An improved electronic trip assembly for circuit breakers as herein described and illustrated with reference to accompanying drawings.