LOCO SHED GOMOH

-
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...
Post a Comment

INDUCTION TYPE INSTRUMENT- techmontra

-

                 INDUCTION TYPE INSTRUMENT

The ammeters which employ the induction effect as their mode of operation are suitable for

A.C. measurements only.

In the induction type ammeter the current to be measured is split-up into two parts. This is done by adopting suitable methods, producing a phase- shift of 90 between such two

A Second method which produces necessary two fields out of phase with each other without

splitting the current is by Shaded pole' system. It is shown in Fig. a1. he current to be

measured is passed through the coil of an electromagnet, which has an air gap in one limb. Hal

of each of the pole faces so formed is surrounded by a copper band. By transformer action thne

two bands have currents induced in them, which cause the flux in that part of the iron so

Surrounded, to be 45° or 50° out of phase with that in the 'unshaded' portion of the poles. The

moving system is the copper or aluminium disc, pivoted with its periphery in the air gap in the

electromagnet.

The eddy currents induced in it by the two fields react with these fields to produce motion. The

control torque is produced by a control spring. The scale is normally cramped at its lower end,

similar to other instruments, where the deflecting force is proportional to the square of current

For obtaining a more uniform scale a cam-shaped disc is used. Damping is provided by a

permanent magnet, positioned opposite to the electromagnet and operating on the main disc.


                                   Fig. a1. 
Errors: 
1. Change in frequency, from the frequency at which it is calibrated will introduce large errors.
2. Temperature variation causes serious errors.
Advantages and Disadvantages:
Measurements.
 
Advantages and Disadvantages:
1. A full- scale Deflection of over 300° can be obtained, giving a long open scale.
2. Damping is good.
3. There is minimum effect on working due to external stray fields because operating magnetic field is strong because of electromagnets.
4. Power consume is fairly large.
5. Degree of accuracy is low.
6. Cost is high.



Comments

Post a Comment

Popular posts from this blog

D.c network and theorems

-
Image
              D.c NETWORKS AND THEOREMS     ____________________________________________ INTRODUCTION _     °in the study of electrical engineering which involves the study of the behaviour of electrical systems and devices the knowledge of electric circuit theory is very essential. We are there for beginning  our study of electrical circuit theory with the study of various  methods off the network analysis and principle theorems which have been developed for solving problems and complex electrical networks °even through the discussion in the chapter is restricted to D.C circuit only, it is equally applicable to A.C network in the case of A.C networks, the only difference is that the impedance's are used instead of just ohmic resistance's. Since the impedance as well as as currents and voltages in such(ऐसा) circuits are expressed (व्यक्त करना) by complex numbers the algebraic manipulation are more extensive(बहुत बड़ा)...
Read more

Nodal analysis problem

-
Image
* Using nodal method, determine the current in the individual of the circuit.   Solution:- Apply KCL in   node 1 :  =  (100-V1/20) -  (V1- V2/15) -  (V1 - V 0/10)=0  = -13 V1 + 4V2= -300  = 13V1-4V2= 300 Apply KCL in   node 2 : = (V1 - V2/15) - (V2 - 0/10)+( 80-V2/10)=0 = 2V1- 8V2 =- 240   From equation (1)   (2), we have,          ∆= | 13           -4   |                                  | 2            -8    |= -104 + 8= -96          D1= | 300       -4   |         | -240      -8   | = -2400-960= -3360 D2= | 13            300   |         |  2      ...
Read more

SURVEYING AND LABELLING

-
Image
              SURVEYING AND LABELLING 1.0  SURVEYING:- Surveying is a branch of civil engineering. Surveying is used to represent the general features of land in their proper relative positions. rom the measurements obtained by surveying, drawings are prepared, which may be in the form of a plan or a map. Surveying is defined as, "the process of toking measurements on the earth surface to determine the relative positions of different points upon it so that, the points may be represented on a plan or a mop Surveying deals with the measurements in horizontal plane 1.1 Purpose of surveying:- 1 To determine the relative positions of existing features of the ground. 2. To layout out mark position or proposed structure on ground. 3. To determine areas, volumes and other related quantities. 4. To prepare map of country and detailed locations of cities, towns, villages and major roads. 5. To prepare engineering plan in detail and section of va...
Read more