Short Circuit Ppt Slides 6q1f9

SHORT CIRCUIT STUDY IN ELECTRICAL TECHNOLOGY Presented By: K.V.V.S.CHAKRADHAR IV Year EEE, JBREC.

CONTENTS        

ABSTRACT INTRODUCTION WHAT IS SHORT CIRCUIT? SHORT CIRCUIT ANALYSIS BENEFITS OF SHORT CIRCUIT STUDY PREVENTIONS OF SHORT CIRCUIT RECENT SHORT CIRCUIT ACCIDENTS IN AP CONCLUSION

ABSTRACT 

Short Circuit (Fault Current) studies are required to insure that existing and new equipment ratings are adequate to withstand the available short circuit energy available at each point in the electrical system

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Fault currents that exceed equipment ratings are capable of extensive equipment damage and are a serious threat to human life

INTRODUCTION Fires from electrical cords or from wiring devices are increasing in these years.  The reason is supposed to be the increase of electrical power dissipation for domestic use.  India has approximately 60000 fires a year.  These fire accidents are occurred due to short circuit. 

Year Total number of fires Electric heater for cooking

1980 59,885

1981 59,865

1982 63,272

1983 58,833

1984 59,674

1985 55,763

192

193

155

176

190

Electric room heater Cable for lighting or telephone Electrical equipments Electrical appliances Wiring devices

363

457

539

511

637

503

800

881

930

944

972

978

502

445

471

447

453

489

819

713

398

459

468

450

428

507

Light including neon light

358

321

331

310

Electric Iron 130 128 94 Others 1,659 1,564 1,582 Note : Blank is due to the change of classification

98 1,590

WHAT IS SHORT CIRCUIT? 

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A short circuit is a fault.  It means there is a very low resistance conducting path from one side of a component to the other A short circuit in an electrical circuit is one that allows a current to travel along a different path from the one originally intended. . The electrical opposite of a short circuit is an " open circuit", which is an infinite resistance between two nodes.

A wire might have come loose which connects two sides of a circuit together

Shorting out a single component which is in series with others

Shorting out a whole circuit

gram of the shorting circuit in transform w .

Figure shows Normal and short circuit conditions

Prevention of short circuit 

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When the cables of the electrical appliances are worn out or it's not connected properly a short circuit may occur. ALWAYS ENSURE THAT THE EQUIPMENT AND ANY TEST EQUIPMENT YOU ARE USING IS PROPERLY GROUNDED AND THAT THE RUBBER MAT YOU ARE STANDING ON IS IN GOOD CONDITION

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DISCOLORED OR LEAKING TRANSFORMER  BEFORE YOU ENERGIZE THE EQUIPMENT, LOOK FOR:  SHORTS  LOOSE, BROKEN, OR CORRODED CONNECTION  DAMAGED RESISTORS OR CAPACITORS  ENERGIZE THE EQUIPMENT AND LOOK FOR: SMOKING PARTS 

DAMAGES 

Damage from short circuits can be reduced or prevented by employing fuses , circuit breakers, or other overload protection, which disconnect the power in reaction to excessive current. Overload protection must be chosen according to the  prospective short circuit current in a circuit.

Benefits of short circuit study 

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Reduce the risk a facility could face and help avoid catastrophic losses. Increase the safety and reliability of the power system and related equipment. Evaluate the application of protective devices and equipment. Identify problem areas in the system. Obtain recommended solutions.

Conclusion 

Finally from this short circuit study, We have to learn about short circuit And we can clarify from some doubtable question like, what is short circuit?, how it happens?, when it happen?, why it happens?. And also learn prevention methods of short circuit. We can know the advantages about short circuit study.

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Recently, 23000 fire complaints a year from all over state. There are lot of fire accidents are occurred due to these short circuit. To protect the buildings from these short circuit, we have to learn about this short circuit phenomenon. The main aim of study of short circuit is protect the peoples/buildings from short circuited fire incidents.