THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE
NATURE OF THE INVENTION
EXTERNAL SIMULATION KIT FOR ELECTRONIC TRIP UNITS USED IN
AIR CIRCUIT BREAKERS
numbered as dated
A) FIELD OF TECHNOLOGY:
1. The present invention relates generally to electronic units and particularly to electronic trip units and specifically to the design and use of external simulation kit for electronic trip units. The present invention also describes the provisions to keep the trip details type of test, test settings, trip time are stored in one kit.
B) DESCRIPTION OF PRIOR ART:
2. This invention relates to a design and use of external simulation kit for electronic trip units. The different fault conditions such as overload, short Circuit (I2T On & Off), instantaneous, and earth faults (I2T On & Off) are simulated by the kit for testing the electronic trip unit. This invention also has the capability to download the stored trip records of the trip units to the simulation kit and the data can be used for future analysis.
3. Air circuit breakers are commonly and are generally used in protecting high cost equipments from current faults. External simulation kit is used to test the electronic trip units by simulating the various fault conditions. Various fault conditions are generated by the simulation kit and provided to the trip unit to check the functionality of the trip unit under the simulated condition. With the help of menu navigation system (Keypad or/and LCD), user can select various trip unit simulation
condition and levels. Based on the selected level the trip unit will respond to the simulation. Almost this external simulation kit is performing in a Power on Self-test and error condition. The errors detected are then displayed into the LCD monitor.
4. The main purpose of developing this external simulation kit is for testing the functionality of the electronic trip unit of circuit breakers. The entire series of trip units developed for circuit breakers can be tested. Every trip unit differs in their functionality for different current ranges with an unique characteristic of the specific trip unit. The simulation-kit provides a common platform for testing a range of individual performance shown by the trip unit.
5. The patent disclosed in this field has a testing method for all the fault conditions such as overload, short circuit, instantaneous and earth fault in a trip unit. These indicator functions signal when a short circuit, overload or ground fault occurred. Some of the patents disclosed also have a bypass circuit that insures that tripping of the breaker is not jeopardized by failure of the indicators.
6. However, as per the inventor's description there is no specific simulation kit as a feature, which offers multiple functionality of testing of circuit breakers under various fault conditions. And also many earlier inventions did not give a way to external simulation kit for electronic trip units individual phase faults like on which phase the fault occurred. There is a need for a simple, low cost, easy to maintain simulation kit for circuit breaker, which indicates the state of the breaker. The state of the breaker includes various fault conditions indication such as long time faults, short time faults, instantaneous faults and earth faults thereby increasing the precise method of finding the fault condition in a cheaper manner.
C) OBJECT OF THE INVENTION:
7. It is the primary object of the invention to invent a method of indication that utilizes external simulation kit for electronic trip units to the various faults such as overload, short circuit (I2T On & Off), instantaneous fault and earth fault (I2T On & Off).
8. It is another object of the invention is to invent a simulation kit that incorporates different faults conditions as on Power on Self-test. If the test fails, it shall be displayed on the LCD monitor.
9. It is another object of the invention to identify the trip records stored in the electronic trip unit, which can be downloaded to the external simulation kit and the data can be used for future analysis.
10. It is another object of the invention is to invent a method for generating test reports and are stored with the date & time stamping of when the test was conducted along with the details of the tests (value & settings) and with the corresponding unit identification number.
11. It is another object of the invention is to invent an external simulation kit with all functionalities controlled by a PC using a proprietary protocol.
D) PROPOSED SOLUTION:
12. We propose a novel design in the field of circuit breaker fault identification by simulating the fault conditions and visualizing these faults stored into external simulation kit. We propose a simulation kit for testing circuit breakers in the field of power distribution system, which protect the system against various faults such as overload, short-circuit, instantaneous and earth fault.
13. This External Simulation kit has a user interface consisting of a Keypad (7 keys: up, down, left, right, esc, enter, test) & a LCD Display (2 XI6 alphanumeric display). It has 10 user configurable set groups, which contains information such as trip unit type, type of test to be simulated, pick up value & the time delay for the test. Also it is possible to set the trip unit settings to the factory default values using the simulation kit. Apart from conducting the trip test this simulation unit can also be used for the downloading of the trip records from the trip units so that further analysis can be done.
14. In LED indication it is not possible to differentiate on which phase exactly the fault has occurred. This invention enables the user to view the phase in which the fault has occurred through the multi color LED's. Basically these releases will be self- powered. Therefore even if the power is not be available for the trip unit the records are stored in the breaker, which has tripped.
E) BRIEF DESCRIPTION OF THE DRAWING
The Fig. 1 contains the following elements:
a. External Simulation Kit
This circuitry is developed for the purpose of testing the functionality of the electronic trip unit of circuit breakers. The other advantage of this unit is that the entire series of trip units developed for circuit breakers can be tested.
b. Power Supply
A power supply subsystem for providing electrical power to at least node over a management and control unit for distributing power into the communication cabling substantially without interfering with data communication and current
limiting circuitry controlling current of the power distributed into the communication cabling via the power supply interface.
c. Processor
A processor is main central unit of the external simulation kit. This circuit controls the DAC+ Amplifier, RS 485 interfaces, real time clock and RS 232 interface.
d. DAC+Amplifier
A voltage margin setting interface circuit has a single input pin, and is configured to program the slew rate and polarity direction of variation of the operation of a digital-to-analog amplifier, such as may be used to set a reference voltage level.
e. RS 485 interface
This interface provides electrically isolated RS485 communication interface to the PC serial ports the isolation circuit protect the PC from direct connection to hazardous voltages.
f. Real Time Clock
This real time clock generally relates to a method of real-time simulation. The method includes providing a continuous real-time clock to a non real-time simulator and synchronizing a simulation clock of the non real-time simulator with the continuous real-time clock on a continuous basis.
g. RS 232 interface
RS-232 interface is simple, universal, well understood and supported serial interface for communication.
h. User Interface
A user interface is provided that varies the manner in which data is displayed as the size of the user interface is changed.
i. Keys for Menu Navigation
This External Simulation Kit has a user interface consisting of a keypad with 7 keys
The 7 Keys
a. Up
b. Down
c. Left
d. Right
e. Esc
f. Enter
g. Test
j. 2 * 16 alphanumeric display
A 2 * 16 alphanumeric display usually LCD, which has the ability to display both text and numbers.
k. Test signal
This test signal is processed the external simulation kit to electronic trip unit. This unit is receiving all data test signals from the external simulation kit.
I. Feedback Trip Signal
The external simulation kit is completed the overall projects into the feedback trip signal is showed the message to the electronic trip unit. This feedback passes the electronic trip control unit.
m. RS 485 signals
Communication signal.
n. RS 232 signals
Serial port communication signal.
o. 15. Electronic trip unit
This electronic trip unit of circuit breaker is tested by simulating the various fault conditions such as overload, short circuit, instantaneous and earth fault. The trip details type of test, test settings, trip time are stored in kit.
p. PC
PC is a system that controls all data signals, test signals, interfaces, processor power supply checking and the electronic trip units.
F) OPERATION AND WORKING OF CIRCUITS:
15. In the above circuit the external simulation kit describes the testing of the all the fault conditions and even recording from trip unit remotely download of trip unit records using PC when using an self test of external simulation kit.
16. In this circuit the different fault conditions such as overload, short circuit (I2T On & Off), instantaneous and earth fault (I2T On & Off) can be simulated the type of test, test settings, trip time are stored in kit. User can download the trip records of the electronic trip as well as the last 10 trip events recorded by the external simulation kit. This external simulation kit will be performing Power on Self-test. If the test fails the appropriate error condition shall be displayed on the LCD.
17. This external simulation kit is developed for the purpose of testing the functionality of the electronic trip unit of circuit breakers. The advantage offered by this unit is that the user can test the trip unit along with the circuit breaker. The other advantage of this unit is that the entire series of trip units developed for circuit breakers can be tested. Even though the different trip units differ in their functionality and current ranges, the simulation-kit provides a common platform for testing.
G) THE BEST METHOD OF PERFORMING THE INVENTION:
18. To summarize, the scheme presented here is implemented by designing a novel solution that provides the way to external simulation kit used for electronic trip units such as faults and visualize the faults through overload, short time, instantaneous and earth fault. If the test fails the appropriate error condition shall be displayed on the LCD. The present invention is to efficiendy conduct fault simulation in self-test to achieve as high as possible coverage in scan-test, for earth faults with reduced memory usage by providing an improved fault simulation or test generation system.
19. The present invention denotes the external simulation kit can be configured for testing all faults protections and a test reports are stored with the date & time stamping of when the test was conducted along with the corresponding unit identification number, which Backlit LED has been given to avoid the user switching off the unit when any test is in progress. The main advantage of this circuit is that it doesn't require a battery for its operation. Thus many problems like looking for battery charge, recharging the battery, replacement of battery, etc.

WE CLAIM:
Accordingly, one embodiment of the present invention comprises the fault monitoring mechanism that external simulation kit, which provides the visualization of different fault in the particular phase. The electronic trip records stored in the electronic trip unit can be downloaded to the external simulation kit and the data can be used for future analysis.
What is claimed is:
1. A circuit breaker fault identification unit with following functionality a help menu navigation system (Keypad and LCD) a different fault conditions, a trip records stored in the electronic trip unit a Power on Self-test. The test fails result will display LCD monitor.
2. The method of claim 1, wherein said the method of identifying the different fault conditions such as the overload, short circuit, instantaneous and earth faults is claimed here.
3. The method of claim 1, wherein said the method of employing multicolored LED's that is used for visualizing all faults is claimed here.
4. The method of claim 1, wherein said the provision of different fault conditions, trip units, event trip records, set groups as well as trip records status of the external simulation kit is claimed here.
5. The method of claim 1, wherein said the external simulation kit the user purpose of indication used by blinking a Backlit LED is claimed here.
6. The method of claim 1, wherein said the employment of external simulation kit can be controlled by a PC using a proprietary protocol is claimed here.