Welcome to Shankara

Institute of Technology

Seminar on Power Line Carrier Communication

(PLCC)

Presented to:- Presented by:-Mr. Rajesh Kanwadia and Ramanand SagarMs. Shweta Agarwal B.Tech (VIITh SEM)Assistant professor 12ESIEC047(ECE Department)

ACKNOWLEDGEMENT I am grateful to Mr. R. P. Meena (Assistant engineer) for providing me an

opportunity to work as a trainee in PLCC section of Chambal G.S.S. I am thankful to Mr. Rajesh Chander Singh (R.M-II) all other technical staff of PLCC of their valuable practical guidance and their keen interest in my training.

I am very grateful to Mr. Ashutosh Mishra (HOD of ECE Department) to give me opportunity to go under training at PLCC SECTION 132 KV, CHAMBAL G.S.S., JAIPUR as I was very enthusiastic about this. I am also very thankful to our seminar in-charge Mr. Rajesh Kanwadia(Assistant professor of ECE Depatment and Ms. Shweta Agarwal(Assistant professor of ECE Department).

I am thankful to my batch- mate and as well as my training colleague.

CONTENTS INTRODUCTION OF RVPN INTRODUCTION OF PLCC BASIC PRINCIPLE OF PLCC EQUIPMENTS USED IN PLCC OUTDOOR EQUIPMENTS BASIC COUPLING ARRANGEMENT TYPES OF COUPLING INDOOR EQUIPMENTS WORKING WITH BLOCK DIAGRAM TYPICAL PLCC INSTALLATION ADVANTAGES AND DISADVANTAGES OF PLCC REFRENCES

Introduction of RVPN "An ISO 9001:2008 Certified Company“ RVPN's Meter Testing Laboratories at Jaipur and

Udaipur are Now "ISO/IEC 17025:2005 Certified"  Moto:- “ Energy Saved is Energy Generated”. It is the successor company of RSEB. Function :- Tranmission of bulk power from generating

stations to inter-phase point of Discoms.

How Work

Introduction of PLCC Communication using existing power cable is

called as PLCC. Power Line Communication (PLC) is a

communication technology that enables sending data over existing power cables.

PLCC is said to be backbone of Electrical transmission system

Continued… For large power system power line carrier

communication is used for 1. Speech transmission2. Data transmission and3. Protection of transmission lines NEED OF PLCC1. To cope up with ever increasing size of power grid2. Need for economic and reliable means of

intercommunication between various generating station, substation and control room

3. Avoid dependence of busy telephone lines 

BASIC PRINCIPAL OF PLCC

Power-line communications systems operate by adding a modulated carrier signal on one conductor, on two conductors or on all three conductors of a high-voltage AC transmission line

Allotted frequencies range for this purpose is from 24 to500 kHz, with transmitter power levels up to hundreds of watts.

Continued….. To carry out this communication there is a

need of modulation. For PLCC, generally amplitude modulation (AM) is used

Sometimes frequency modulation is also used if transmitting medium is optical fiber instead of coaxial-cable.

EQUIPMENTS USED IN PLCC

Outdoor Equipment1) Wave traps2) LMU3) CC/CVT4) Drainage coils5) Lightning arrester6) Earthing switch7) Co-axial cable

Indoor Equipment1) PLCC panel2) Battery bank3) Battery charger 4) EPBAX5) RTU6) Modem

Wave Trap

Do not allow the transmitted HFcarrier to enter inside the sub-station. without line trap HF carrier get bypassed to some other line on the same bus bar and may leak to ground.

Wave Trap function = PLC signal Blocking

Substation

Line Trap = High Impedance for Career signle Low Impedance for Power signle (50 Hz)

Power signle

PLCC Signal

LMU LMU = impedance matching Transformer + high voltage

Protection

To prevent dangerous potential on the PLCC connection

To match PLCC set & transmission Line

Matching + Protection

LMU

Coupling Capacitor (C.C) :- Couples high frequency carrier with Power Line ( 4000 to10000pF)

Coupling Capacitor = High Impédance to power frequency(50 Hz)

Low Impedance to career frequency

Drainage coil :- If any leakage current flows due to any distortion, then this drainage coil arrests all leakage current and ground it so that it does not cause any harm to the network.

Lightning arrester :- Device used on electrical power systems and telecommunications systems to protect the insulation and conductors of the system from the damaging effect of lightning.

Earthing switch:- Used at the time of maintenance of LMU.

Co-axial cable :- Used for inter connection between PLCC & L.M.U. for carrying the high frequency signal.

 

BASIC COUPLING ARRANGEMENT

TYPES OF COUPLING1. Phase to ground coupling :-

Continued…

2. Phase to phase coupling :-

Continued…

3. Inter linecoupling :-

INDOOR EQUIPMENT

PLCC PANEL

Cabinet Module

ABB PLCC terminal ETL- 41 System data -- complies to IEC 495 Operating mode : Single side band Suppressed carrier

Frequency range: 40 to 500kHz (programmable in 4 kHz Steps)

AF Bandwidth: 4 kHz (Speech band=300 – 3400 Hz)

Transmitter RF output power : 40W ( +46 dBm)

Receiver Selectivity : 70dB ( 300Hz from band limit) Receiver Image rejection > 80 dB

RTU, EPBAX and BATTERY BAANK R.T.U (REMOTE TERMINAL UNIT) :- Interface with the electrical network to be monitored/controlled. Collects, filters& processes the power system data and transmits it to the control center. Receives the control commands from the control centre EPBAX 2003(PLCC):- This is used for telephone facility at

PLCC and grid sub station. BATTERY BANK:- In case main supply is off, battery bank

supply required amount of supply power. Now a day care-free VARLA BATTERR is used.

BATTERY CHARGER

Technical specifications:-Normal input :- 415 V AC 3 PhaseInput variation :- +/- 20% of voltageFloat charger:-Efficiency :- >70%Line regulation & load regulation :- +/- 1% individualRipple :- 0.6 V PP (Peak to peak)Boost charger:-DC output :- 43.2 to 67.2 VOutput current: - 25-70 Amps.Over load :- 10%Efficiency :- >80%

Working with Block Diagram

Typical PLCC Installation

MS = Master stationPAX = Private automatic exchangePR = Protection relayPC = ComputerM = Modem

ETLETL

LTLT

CFAX

FAX

PR PC MS PAX FAX

M

PR PC RTU FAX

M

PR= Protection relayFAX = Facsimile equipmentM = ModemRTU = Remote terminal unit

cc cc

ADVANTAGES & DISADVANATGES ADVANATGES No separate wires are needed for communication purposes power lines have appreciably higher mechanical strength. Power lines have large cross-sectional areas resulting in very low

resistance per unit length. DISADVANTAGE Proper care has to be taken to guard carrier equipment and persons

using them against high voltages and currents on the lines. Noise introduced by power lines is far more than in case of

telephone lines. This is due to the noise generated by discharge across insulators, corona and switching processes

REFRENCES [1] http://www.rajasthandirect.com/government-department/rajasthan-state-electricity-board [2] http://electrical-engineering-portal.com/power-line-career-communication-plcc [3] http://www.engineersgarage.com/articles/plcc-power-line-carrier-communication [4] en.m.wikipedia.org/wiki/Power-line_communication [5] en.m.wikipedia.org/wiki/Amplitude_modulation [6] Manual of ETI equipment A.B.B(Asea Brown Bowery Ltd) [7] ] http://www.engineersgarage.com/articles/plcc-power-line-carrier-communication   [8] [ N.N.Biswas and Edition-1975], “Principles of carrier communication”. [9].Manual on Battery Charger Omega Electroics [10] slideshare.net/mobile/vishu_angira/power-line-career-communication

THANK YOU

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