DR.JIVRAJ MEHTA INSTITUTE OF TECHNOLOGY, MOGAR

ELECTRICAL ENGINEERING DEPARMENT

A REPORT ON INDUSTRIAL VISIT

TO

JYOTI LIMITED

SUBMITTED BY

Mr. Vipul Rajput Mr. Ankit Rabari Assistant Professor Assistant Professor Elect. Engg. Department DJMIT, Anand

Elect. Engg. Department DJMIT, Anand

LIST OF ATTENDED STUDENTS

ELECTRICAL ENGINEERING DEPARTMENT

INDUSTRIAL VISIT TO JYOTI LIMITED, MOGAR

DATE: 19TH APRIL, 2014 TIME: 1:00 PM TO 2:30 PM & 3:00 TO 4:30 PM

Sr. no 8th sem (Batch 1) Sr. no 8th sem (Batch 2) 1 Sharma Maulik C. 22 Parikh Kaushal Amrishbhai 2 Vohra Sahalbhai I. 23 Patel Vikashkumar Kamleshbhai 3 Shah Nisarg P. 24 Prajapati Deepkumar Bharatbhai 4 Patel Umangkumar P. 25 Soni Tushar P. 5 Dave Juhi U. 26 Macwan Anjaliben Dineshbhai 6 Vohra Sarfraj I. 27 Jadav Sejalkumari Vijaysinh 7 Patel Sagar C. 28 Patel Bhavinkumar Yagneshbhai 8 Shah Jay I. 29 Shah Krushan Bhupeshbhai 9 Patel Amit L. 30 Jaiswal Parth Sandeep 10 Patel Vatsal D. 31 Patel Meet Deepakkumar 11 Patel Prayag Hemandubhai 32 Padhiar Chiragbhai Jashvantsinh 12 Advani Kunal Rajendra 33 Sindha Sneha R. 13 Patel Sandeepkumar R. 34 Dhruv Upadhyaya 14 Jain Kashish Kamlesh 35 Patel Darshankumar 15 Shah Parth Bakulbhai 36 Bhalja Rahul Rakesh 16 Luhar Jaykishan Ajitbhai 37 Brahmbhatt Manishkumar Kamleshkumar 17 Patel Viralkumar K. 38 Valand Priteshkumar Atulbhai 18 Jani Jaydeep 39 Rabari Ankitkumar Ramjibhai 19 Bodana Dhavalkumar 40 Patel Dhavalkumar Jayantibhai 20 Vyas Kaushal Urvishkumar 41 Patel Alpesh Prahladbhai 21 Macwan Nishant Sadgun 42 Shah Mihirkumar Dineshbhai 43 Vyas Krupali Bhaskarbhai 44 Barad Niravkumar Ishavarlal 45 Sharma Miteshkumar Mahendrabhai

ACKNOWLEDGMENT

We are very thankful to our college Management, Principal Dr. Archana Nanoty, Prof. Amit

Patel (Head of Electrical Engg. Dept.) and Mr. Jignesh Patel (The Personnel Manager of Jyoti

Limited, Mogar) for their effort and support to make this visit successfully.

We are also thankful to the members of Jyoti Limited who gave us the whole idea about all

the products by sharing their knowledge with the students of Electrical Engineering

Department (8th sem).Their inputs will surely prove beneficial to our students.

Our sincere thanks to Mr. Rishi Patel (Jr. Engineer) and Mr. Ketan Prajapati (Jr. Engineer)

for their valuable time. Their guidance and explanation really helped us to understand the

theoretical concepts and their practical applications.

About the Company

JSL Industries Ltd. was established in the year 1966 along with other group companies like JEM Industries Ltd. and Jyoti Pumps & Electricals Ltd. In the year 2006, JEM Industries Ltd. and Jyoti Pumps & Electricals Ltd. were amalgamated with JSL Industries Ltd. JSL Industries Ltd, is ISO: 9001-2008 recognized company, engaged in the manufacturing of various HT and LT products having a modern factory at Village : Mogar, near Anand, Gujarat with well equipped plant and machinery along with professionally well trained manpower. The range of products manufactured by JSL Industries Ltd, includes HT Indoor and Outdoor Instrument Transformers, Full and Reduced Voltage Motor Starters – Air Break and Oil Immersed, LT Power and Auxiliary Contactors, Thermal Overload Relays, LT ACBs, MCCBs, Control and Power Switches, LT Power and Motor Control Centres, LT Switchboards, LT Distribution Boxes, Mono-Block Pumps, TEFC, SPDP and VHS Motors, etc. It's in recognition to the superior quality, professional approach, excellent engineering and modern product design that M/s JSL Industries Ltd. is in the approved vendor list of leading engineering consultants, Utilities, public sector organization etc.

(Squirrel cage Induction Motor):

MOTORS

Types of motor manufactured:-

SPDP Vertical Hollow Shaft Motors 3.7kW. to 90 kW. SPDP Vertical Solid Shaft Motors ( CUD ) 3.7 kW to 93 kW ( 4 Pole ) TEFC Vertical Solid Shaft Motors ( CUTF ) 9.3 kW to 18.5 kW ( 4 Pole ) TEFC Squirrel Cage Induction Motors 0.18k W to 45 kW. Screen Protected Drip Proof Motors 15KW to 55kW. Textile Motors for Loom, Card, Ginning, Ring Frame. Eff1 & Eff2 motors in all frame sizes

INTRODUCTION

Backed by continuous research and development activity and adoption of modern manufacturing techniques “JYOTI” motors manufactured under close supervision of highly qualified engineers, are rugged in construction, compact in size, lighter in weight and suitable for continuous silent running for prolonged periods. Every electric motor, leaving the works is suitable to vigorous and strict quality control. Inspection and testing so as to comply not only with Indian Standards but also with International standards like IEC,VDE,BS.

RANGE

The CTF Series motor are available in rating of 0.18KW to 55KW in 2, 4, 6 and 8 poles and frame size up to 250.

SPECIFICATIONS

All TEFC Squirrel Cage motors are designed to give rated output at 415V and 50Hz.

CONSTRUCTION

Stator:-

The stator is made up of cast iron as per grade 200 of ISO 2010 with integral feet providing sturdy construction. The fine construction of stator frame offers optimum heat dissipation combined with long lasting reliability and rugged operation.

The Stator core is made of high quality low loss silicon steel stampings conforming to IS: 648. It is rigidly held by pressure inside body clamps. The complete stator core is pressed under pressure.

Rotor:-

The squirrel cage rotor is made of die-cast aluminium EC grade 3 as per ISO-4026.the rotor is shrink fitted on high grade steel shaft of 40 C8 grade as peer IS-7283 and machined all over to very close tolerance. The rotor is skewed for better performance. Each rotor is dynamically balanced on confirming to grade 6.3 on highly accurate digital dynamic balancing machine to ensure very low amplitude of vibrations.

WINDING AND INSULATION

Stator:-

The stator winding consists of modified polyester enamelled copper wire as per IS-13730(Part-III) for superior dielectric strength and thermal properties. Use of “F” class insulation ensures satisfactory functioning of motors allowing temperature rise of 70 degree measured by the resistance method over an ambient temperature of 50 degree. The slot

Insulation material used has very high dielectric strength, the vacuum and pressure impregnation with synthetic thermosetting varnish and curling in precisely temperature controlled oven provide strength to sult atmospheric conditions existing in chemicals, fertilizers, sugar and other industries. Additional coating of air drying varnish is given when motors are required to operate under highly humid atmosphere.

VENTILATION

Efficient heat dissipation is effected by guided air flow along motor frame,cooling fans with the help of an external fan.Rotor fans create turbulence within air inside and therby prevent hot spots in overhangs.The heat inside gets transferred by conduction from winding to stator stack and in turn to motor body and then by convection and radiation from the external fan where the air flows.

TESTING

NO LAOD TEST

1) NO load is connected to Induction motor so as to carry out NO load test on induction motor. 2) Close the TPST (Triple Pole Single Throw) switch connecting three phase mains supply to induction motor. 3) Start the motor by applying reduced voltage to the stator. 4) Gradually increases the voltage to its rated value. 5) Now increase the voltage by clicking the arrows on three phase variac 6) As we go on increasing the supply voltage we can observe the change in speed of motor in digital tachometer. 7) Observe the readings of voltmeter, ammeter, wattcmeters and tachometer at various stator input voltages. 8) Store the data by clicking “Start Storing Data” at various i/p voltages 9) Go on repeating this procedure till sufficient readings are stored. 10) Now display the data by clicking “Show data”. It will display data as shown 11) Now select one of the graph from available graphs and use “Generate graph” to plot the graph .For Ex. 12) While switching off, gradually decrease the voltage applied to motor and make it zero. 13) Open the TPST switch.

BLOCKED ROTOR

Blocked rotor test is conducted on an induction motor. It is also known as short circuit test or locked rotor test or stalled torque test. From this test short circuit current abnormal voltage, power factor on short circuit, total leakage reactance, starting torque of the motor can be found. The test is conducted at low voltage because if the applied voltage was normal voltage then the current flowing through the stator windings were high enough to overheat the winding and damage them. The blocked rotor torque test is not performed on a wound rotor motors because the starting torque can be varied as desired. However, blocked rotor current test is conducted on squirrel cage rotor motors.

Method:-

In the blocked rotor test, the rotor is locked. A low voltage is applied on the stator terminals so that full load current flows in the stator winding. The current, voltage and power input are measured at this point. When the rotor is stationary the slip s=1, .The test is conducted at 1/4 the rated frequency as recommended by IEEE. This is because the rotor's effective resistance at low frequency may differ at high frequency. The test can be repeated for different values of voltage to ensure the values obtained are consistent. As the current flowing through the stator may exceed the rated current, the test should be conducted quickly. By using the parameters found by this test, the motor circle diagram can be constructed.