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A VERY GOOD MORNING TO ALL OF YOU
VOCATIONAL TRAINING ON DIESEL
LOCO SHEd KHARAGPURA PROJECT ON
RELAYS
Project maid by
SHESHADRI SHEKHAR RAUTH
BACHELOR OF TECHNOLOGY
IN
ELECTRICAL ENGINEERING
NARULA INSTITUTE OF TECHNOLOGY
WEST BENGAL
Acknowledgement
I take this opportunity to express my sincere gratitude to all who have helped me in the successful completion of my vocational training and this project report. I would like to say my greatest appreciation to the highly efficient and devoted technical staff, supervisors of the DIESEL LOCO SHED, KHARAGPUR.I am highly indebted to them for their tremendous support and help during the completion of my training and project report.
Sheshadri Shekhar Rauth
ContentsHistory of Diesel Loco ShedRelaysBasic design and operationType of relays used in DLSWheel Slip relayGeneral purpose relayContactor relayReferences linksConclusion
History of Diesel Loco Shed
RAILWAY: SOUTH EASTERN RAILWAY SHED : DIESEL LOCO SHED, KHARAGPUR
I. Brief History
1. Year of Establishment: 1986.2. Road No / Type of the first loco homed in Shed: WDM13. Details of any heritage Locos in Shed on pedestal or
otherwise: NIL5. Type Wise Holding (as on 01-06-10): WDM 2 48WDM3A:35 WDG3A:5 WDS6: DEMU 1400 HP DPCs: 07
6. Homing Capacity: 100 locomotives
RelayA relay is an electrically operated switch. Many relays use an electromagnet to operate a switching mechanism mechanically, but other operating principles are also used. The first relays were used in long distance telegraph circuits.
Basic design and operation When voltage is supplied to the primary circuit, current flows through the coil winding to ground. Whilst doing so, a magnetic field develops around the primary coil. As the magnetic field builds, it pulls together the switch contact in the secondary circuit, thus supplying current to the component being operated. When the relay is switched off the magnetic field is removed and the sprung plate returns the switch to the open circuit position, thus switching off the power.
Schematicsymbol for the relay
Switching contact
(nail)
Armature contact
Electromagnet
AA cell 1.5 v
Switch
The controlled device in this schematic is a 6 – 9 volt light bulb. You can use a DC motor or other device.
- +
Types used in DLSWheel Slip relayA Wheel Slip relay has four terminals. Two of those are use in series operation and another two are used in parallel operation. At the starting time out of six traction motor each two are connected in series and those all three constructions are connected in parallel with a resistor. In between one pair of motors the wheel slip relay is connected in the equi-potential position.
General Purpose relay (GP)
This type of relays is generally used in loco. It has a magnetic coil. It is magnetized for tripping. It is a substance that can make or break more than one circuit at a time.The rating of the magnetic coil is 74 v dc, 450 ohm at 20 degree C. The contact of the relay is normally closed. By energizing the magnetic coil the contact can be open. At a time more than one circuit can be operated through this relay.
Contactor relay
Such devices are often used for motor starters. A motor starter is a contactor with overload protection devices attached.
References links
www.kpsec.comwww.autoshop101.comwww.oenindia.comwww.nteinc.comwww.teledynerelays.com www.circuitstoday.com www.embed4u.com www.electrical4u.com etc.
ConclusionTraining opportunities and facilities provided to us were
adequate and helpful. Each and every department of this organization has given us full cooperation. All the instructors journey in the reputed organization.
During my training period, I have gained adequate and valuable knowledge regarding various machineries and instruments used in DLS(kgp). I hope that whatever valuable knowledge and experiences I have gained during this period, will be useful and helpful in my future professional career.