LOCO SHED GOMOH

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ACKNOWLEDGEMENT I would like to express my sincere grateful and profound gratitude to LOCO SHED ,GOMOH for providing an opportunity to undergo Vocational Training of 04 weeks in “ELECTRIC LOCO SHED, Gomoh, Jharkhand’’. I bear immense pleasure in expressing my gratitude and thanks to all the Employees of respective shops for their honest teaching, practical demonstration, guidance and suggestion in respective sections. Furthermore, I would like to acknowledge with much appreciation the crucial role of staffs, who gave us the permission to use all required equipment and the necessary materials during our training period. CONTENTS 1. Introduction 2. Locomotives 3. Syntaxs used in Loco 4. Components of Loco 5. Different Sections of Loco 6. Brake Rigging 7. Pantograph 8. Traction Converter 9. Working of Loco 10. Conclusion INTRODUCTION  The ISO-9001-2008 certified Electric Loco Shed, East Central Railway, Gomoh situated in Gomoh. ELECT...
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Hot wire instrument

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                   HOT WIRE INSTRUMENT

MAIN PART:- 
(1.) Platinum- irridium wire, 2. Thread, 3. Pulley, 4. Spring
WORKING PRINCIPLE:-
It works on the heating effect of current.
WORKING:-
As an ammeter it is connected in series of the circuit. The current to be measured is passed through the platinum- irridium wire.
• The wire is stretched between two terminals.
• To this fine wire one more wire is attached at one end and to the terminals at the other end.
• A threat is attached to the second wire.
• It's arrangement with pulley and spring is shown in figure (a.)
     figure (a.)  Hot wire instrument
DEFLECTION:- 
When the current is passed through the fine wire due to heating effect      ( directly proportional to I^2 R) it gets heated and hence expands.
• The sag of wire is magnified and hence expansion is taken- up by the spring.
• This sets- up the motion of pulley. Pulley rotates . This moves the pointer of the meter on the graduated dial of meter and meter reads the current.
• The meter is calibrated to read r.m.s value of current.
ADVANTAGES:- 
• Only rough value ( not accurate ) can can be measured so not that advantageous.
DRAWBACKS:-
0. Meter is unstable due to stretching of wire.
0. Lack of ambient temperature compensation.
0. Sluggish response .
0. High Power consumption.
0. Not suitable for overloads.
APPLICATIONS:- 
• Due to so many drawback meter is commercially not used for current measurements as an ammeter but similar thermo- electric instrument is used as an ammeter.
Thank you.
Written by Abhishek Singh E.E

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