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A INDUSTRIAL TRAINING PRESENTATION

ON POWER LINE CARRIER COMMUNICATIONDONE UNDER THE EXECUTIVE ENGINEER

OF RAJASTHAN RAJYA VIDYUT PRASARAN NIGAM LIMITED

(R.R.V.P.N.L.)AJMER (RAJ.)

Guided By :Mr. Arshad NadeemMrs. Ankita Gupta(P.T.S. Coordinator)

Presented By : Dushyant Singh

Chouhan11ESDEC031EC-A, IVth Year

DEPARTMENT OF ELECTRONICS & COMMUNICATION ENGINEERING POORNIMA GROUP OF INSTITUTIONS

SITAPURA, JAIPUR-302022

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CONTENTS About the city Introduction of the company Introduction of the technique Working Components description Survey to the yard PLCC control room Applications Merits of PLCC Demerits of PLCC Future scope of the company Career in R.R.V.P.N.L. Learning and conclusion

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ABOUT THE CITY: AJMER Heart Of Rajasthan. Connecting 11 districts in supply of electricity. Area covered -87256 sq. Km. World Famous For Dargah Sharif And Trithraj Pushkar. Construction Of Nareli is under Process.

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INTRODUCTION OF THE COMPANY: RRVPNL

The Successor company of R.S.E.B. Registered office at Vidyut Bhawan, Jyoti Nagar, Jaipur. Established On 19 July, 2000 by Govt. of Rajasthan

under the provisions of The Rajasthan Power Sector Reforms Act, 1999.

An ISO 9001:2008 certified Company. Situated in Madar,11 km far from the Ajmer Railway

Station. Motto:

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Provides pathway for power in rajasthan.

Intra state transmission of electricity through inter-state transmission system.

New creation of HV lines and grid sub stations of 765 kv/400 kv/220 kv/132 kv rating including there maintenance .

Planning and co-ordination relating to intra-state transmission.

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PLCC Carrier frequency range of 32khz to 508khz over high voltage power transmission lines with suitable line coupling equipment.

Amplitude modulation single side band suppressed carrier transmission to permit longer range of transmission.

Cost effective for long distance communication.

Transmission of speech, facsimile, telegraphy, telemetry and tele - protection signals is done through PLCC.

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WORKING

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COMPONENT DESCRIPTION

Lightning Arrester: A device connected between line

and earth i.e. In parallel with the over headline, HV equipments and substation to be protected.

Safety valve which limits the magnitude of lightning and switching over voltages at the substations, HV equipments and provides a low resistance path for the surge current to flow to the ground.

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Insulator: Provides insulation to the power

conductors from the ground so that currents from conductors do not flow to earth through supports.

Connected to the cross arm of supporting structure and the power conductor passes through the clamp of the insulator.

Prevent any leakage current from conductors to earth.

Wave Traps: Trap the HF communication

signals sent on the line from the remote substation .

Diverting the information to the telecom panel in the substation PLCC control room.

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Circuit Breaker: In the operation of a power

system its function is to prevent or limit damage during faults or overloads, and to minimize their effect on the remainder of the system.

Systems are divided into protective zones separated by circuit breakers.

During a fault, the zone which includes the faulted apparatus is de-energized and disconnected from the system.

Used for circuit switching under normal conditions.

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Line Matching Unit: The out-put of PLCC is

connected to the line matching unit before to the power lines to achieve the proper impedance matching in between PLCC equipment and power line.

CVT/CC (Control Voltage transformer/Coupling capacitors):-

It is connected to the line matching units and the power line .

used for blocking the high voltage entering to the PLCC Equipment.

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Battery Charger: PLCC panel works on rectified

AC . when main supply goes off

uninterrupted power supply is provided by the battery charger. 

Work as like online ups. Panel is connected to the

batteries and the battery is charged simultaneously when the supply is on.

1 panel consume 1.5 ampere of current.

24 Batteries of 2v serially connected.

Battery backup of 3 days is kept.

Battery Charge

r

Float Charger section

Boost charger section

Control Section

Alarm Sectio

n

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SURVEY TO THE YARD

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PLCC CONTROL ROOM Consist of 6 PLCC panels, a

telephone exchange box, battery charger, BPL landline telephone.

PLCC panel is consist ofMain Subrack • VF

interface unit

• Channel modem unit

• Data interface unit

• Supervisory unit

• Power amplifier unit

• Power supply unit

HF hybrid subrack • HF filter

unit • HF

hybrid unit

• LCD and keypad unit

Termination panel

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PLCC PANEL Puncom PLCC terminal pl-9500 (ver.-01) Single and dual channel configuration DSP techniques provide easy field

programmability. Fully complies to EMI & EMC standards. Supervisory unit facilitates easy maintenance and

operation. Easy user interface using LCD display for status

and alarm monitoring. Has crystal band pass filters giving extremely

good VF response. Employs compressors and expanders to improve

noise performance. Cost up to 1.3 lac on paper.

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APPLICATION Transmission of

SpeechFacsimileTelegraphyTelemetry& Tele protection of signals.

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ADVANTAGE   Reaching all sites and hence reducing the cost of

constructing separate telephone lines. Appreciably higher mechanical strength,

normally remain unaffected under the conditions.  

Carrier signals suffer much less attenuation Very low price transmission No external agency clearance required Quick , and easy installation of the system. Allow excellent quality of signal up to 6 stations. Maintenance cost is low

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DISADVANTAGE  

Proper care has to be taken from time to time. Not user friendly. Noise interference is there One person is required at a time. Electricity theft occurs. If you have money, you have electricity. Periodic patrolling is important.

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FUTURE SCOPE OF COMPANY

Tends to the privatization of the company. Internet connection is provided through

PLCC. More sub grid stations construction is under

process. More efficient systems are installed . New techniques are introduced.

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CAREER IN R.R.V.P.N.L. Post of Jen. is available. Good salary and other extra allowances. Time reliable job. Periodic tours. Other extra facilities. Employee of Rajasthan Govt.

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LEARNING AND CONCLUSION Its honour for me to work under the Executive Engineer

of R.R.V.P.N.L., Ajmer. Got to know about the PLCC techniques and equipments. Learn how Patrolling is done. Learn to maintain personal & professional life separately. Understand the Govt. working system. It has been exciting and challenging to understood the

fundamental concepts of power transmission and equipments.

It has been great experience for me to trained from a government recognition in the field of electronics.

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REFERENCES

User manual of PLCC panel Training notes Slideshare website-

www.slideshare.net Rvpn website- www.rvpn.co.in Ajmer discom website- www.avvnl.co.in Seniors

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