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1. Final Year Project Presentation On “MCB & FUSE TESTING KIT” Manmohan Memorial Polytechnic Buddhiganga-4, Morang Department of Electrical Engineering

2. Presented By: Anjila Koirala (DEE-00161-017) Dipesh Kumar Banrait Yadav (DEE-00171-017) Jagarnath Raut (DEE-00175-017) Rabi Kumar Sah (DEE-00186-017) Ramesh Kumar Sah (DEE-00188-017) Suban Majhi (DEE-00199-017) Suchana Sharma (DEE-00200-017) Presented To: Supervisor: Department of Electrical Engineering Er. Binod Ghimire Asst. Lecturer MMP , Morang

3. Presentation Flow Project Objective Background Features of Project Block Diagram Electrical Component Main Hardware Components Structure of Testing Kit Time & Cost analysis Project Application Future Scope Conclusion

4. Project Objectives To observe MCBs tripping characteristics with respect to time & current To classify MCBs types Fuse melting time-current characteristics. It can also test the circuit breaker ranging from (05-amps to 250-amps ).

5. Background We have chosen a path to implement our innovative ideas in the form of this project named as  ”MCB & FUSE TESTING KIT”. The basic concept, which is emerged out from our project is to test the operating current and tripping time of the MCBs and also is used to test the melting time of the Fuse. Digital timer is provided with start and stop facility to study the current versus tripping time characteristics. Inbuilt isolated variable AC Power Supply is provided for safety.

6. Features of Project There are various features of our project. It can offer number of advantages to the user. Our project has some of the most countable features that have mentioned below: Digital Timer with automatic Start/Stop/Reset Isolated Power Supply using Transformer Inbuilt variable current injection facility Equipped with supply indication lamp Display: Digital Voltmeter & Ammeter

7. Block Diagram Single phase supply Voltage regulator Current Injector Digital Timer Types of MCB or classes Digital Voltmeter Digital Ammeter MCB testing point Fuse testing point

8. PROJECT PARTS The MCB & Fuse Testing Kit is divided into two basic part: Electrical parts: This part of the project consists of electrical circuit which and all the electrical devices which is used to work together with the civil structure. Civil parts: This parts of the project consists of the basic structure of the testing kit which is used to fixture the electrical part.

9. Electrical Parts Components Digital Voltmeter Digital Ammeter Digital Timer Current Transformer (CTs) Relay Switch Single Phase Supply Fuse Miniature Circuit Breaker(MCBs ) Connecting Wires Push Button Switch (NO/NC) Indicators Resistors Capacitors Transistor Inductor IGBT( Insulated Gate Bi-polar Transistors) Step-down Transformer Current Injector Knob PCB (Printed Circuit Board) Board.

10. Digital Voltmeter A voltmeter is an instrument used for measuring electrical potential between two points in an electric circuit. Analog voltmeter moves a pointer across a scale in proportion to the voltage of the circuit; digital voltmeter gives a numerical display voltage by use of an analog to digital converter.

11. Digital Ammeter An ammeter (from Ampere Meter) is a measuring instrument used to measure the current in the circuit. Electric currents are measured in amperes (A), hence the name. The main principle of ammeter is that it must have a very low resistance and also inductive reactance. Now, why do we need this? Can't we connect an ammeter in parallel? The answer to this question is that it has very low impedance because it must have very low amount of voltage drop across it and must be connected in series connection because current is same in the series circuit.

12. Miniature Circuit Breaker Miniature circuit breakers commonly known as MCB are mechanically operated switches cum circuit protection devices. It is an electro-mechanically operated automatic circuit protection devices. An MCB is used to interrupt a circuit during overload and short circuits. It can be used as an alternative to fuses for domestic applications. The advantage of MCBs over fuses is that they are reusable even after interruption of the circuit after an overload or short circuit. Moreover, they are more sensitive to faults than fuses.

13. Time-current characteristics Time-current curves are used to show how fast a breaker will trip at any magnitude of current. The following illustration shows how a time-current curve works. The figures along the bottom (horizontal axis) represent current in amperes. The figures along the left side (vertical axis) represent time in seconds.

14. Operation of MCB Type Tripping Current Operation Time B 3 to 5 times full load currents 0.04-13 sec C 5 to 10 times full load currents 0.04-5 sec D 10 to 20 times full load currents 0.04-4 sec K 8 to 12 times full load currents <0.1 sec Z 2 to 3 times full load currents < 0.1 sec In the case of overloads, a current more than the rated current is driven through the MCB. As the current flows through the bimetallic strip, it gets heated up and deflects by bending and releases the mechanical latch. Deflection time of bimetallic strip depends on the amount of current flowing through the strip. Higher the current faster will be the deflection of the bimetallic strip .

15. FUSE In  electronics and electrical engineering, a Fuse is an electrical safety device that operates to provide over current protection of an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby stopping or interrupting the current. It is a sacrificial device once a fuse has operated it is an open circuit, and must be replaced or rewired, depending on its type.

16. Time-current characteristics of Fuse

17. Printed Circuit Board A  printed circuit board (PCB) mechanically supports and electrically connects  electrical ,  electronic components using conductive tracks, pads and other features etched from one or more sheet layers of copper laminated onto and/or between sheet layers of a non-conductive substrate. Components are generally soldered onto the PCB to both electrically connect and mechanically fasten them to it. Printed circuit boards are used in all but the simplest electronic products. They are also used in some electrical products, such as passive switch boxes.

18. Structure of Testing Kit The structure of MCB & Fuse Testing Kit are given below:

19. Specifications Mains Supply : 0-220V AC ±10%, 50Hz Single Phase Variac : Input : 230V Output : 0-270V Current : 10A Single Phase Transformer Rating : 1kVA Input : 230V Output : 230V Experimental Setup MCB’s : B type, 6A C type, 2A HRC Fuse : 6A

20. Time & Cost Analysis TASK TIME ITEMS COSTS (RS) Research Work 4 days All the components 1500/- System Designing 3 days Testing Kit designed of plywood 2500/- Hardware Designing 3 days Travel Charges 2500/- Hardware Prototype 2 days Connecting the circuit 1300/- Electrical Components 1 day Market research and buying materials 21500/- Reports Writing/ Presentation 4 days Other expenses including Documentation 5000/- Total Time 17 days Total costs 34300/-

21. Project Applications Generally, the application of this “Testing Kit” are: It is used in the industries area, It is used in the switchgear for the protection purposes. It is used in the manufacturer’s company where the MCBs & Fuse are made.

22. Future enhancement Digital Timer:- In our project “MCB and Fuse Testing Kit”. The extra stopwatch is needed to observe tripping time. The new technology i.e. VF meter is replaced in the place of timer to shows multi-functions and this meters shows (3 in 1, voltage, current & time ). Modifications:- The modification of this testing kit is that, this kit is used to test only the trip test of the MCB & Fuse, for the more reliable we have to test its temperature and can test the 3-phase circuit breakers also.

23. conclusion This is useful for the development of future standards Digital testing gives precise information about the breaker, as obtained from laboratory tests A testing kit made by our group member's is quite difference from the testing kit available in the market. Hence, from this testing kit, the time-current characteristics and actual tripping time of the MCB and Fuse is observed.

24. results Hence, finally the project MCB and Fuse testing Kit is successfully completed and the output obtained from it is given below : S.N. Types of classes Operating Time Tripping Current 1 B-6 7A 2 C-10 13A 3 B-20 25A

25. references Tetra Engineering Limited powered by WeblinkIndia.Net  website designing and development company. www.wikipedia .com www.skrelectronics.com www.Electrical Engineering Portal.com 90 SM 317-8 JANUARY 1991 “CIRCUIT BREAKER TESTING KIT SYSTEM FOR CURRENT-TIME TESTING OF FUSE & MCBs” H. G. Gerlach Harns Kull AG, CH-4552 Derendingen Switzerland. In power engineering, reasons of narrow-band quality are not considered to be a steady-state operating condition. www.indiamart.com .

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