Transmission of Data Over Electric Power Lines1

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³DATA TRANSMISSION OVER ELECTRIC POWER LINES´

A Technical Seminar

by

RAJEEB LOCHAN DASH

Reg No .- 0701401080

ECE Dept.

Nalanda Institute Of Technology

BBSR

Dt. 24th

July 2010

POWER LINE TRANSMISSION

[PLT]



Content:y INTRODUCTION TO PLT

y WHAT OTHER TECHNOLOGIES AVAILABLE?

y COMPARISION BETWEEN PLT & OTHER RELEVANTTECHNOLOGIES

y WHY PREFFER PLT?

y 3 MAIN SERVICES OR APPLICATIONS PLT PROVIDES

y PLT ARCHITECTURE

y

BPL [BROADBAND OVER POWER LINE]y UPGRADES REQUIRED IN PLT SYSTEM

y RECENT DEVELOPMENT

y CONCLUSION



INTRODUCTIONPower Line Telecommunications (PLT)

What it aims?

What importance it bears?

What more it provides ?



What other options do wehave?

PSTN

ISDN

Cable MODEMs

ADSL-Lite



Table.1-Comparison between PLT and other relevant technologies

PSTN ISDN Cable

MODEMs

ASDL-lite PLT

Mature &

Robust

Goodinstalled base

Wide choice

of product

Easy toinstall & use

Relatively

slow

On demandonly

Mature &

Robust

Widely available

Expensive

for consumemarket

On demandonly

Excellent

performance

Permanently on-line

Limited

geographicalcoverage

Connectionbased

Good

performance

Currently atthe trial stage

Length of

local loopaffectsperformance

Good

performance

Permanently on-line

Good

geographicalcoverage

Atdevelopmentalstage

No installedbase



RELEVANCE OF PLTTHE POWER GRID

Is ubiquitous

offers last-mile connectivity

supports information-based services with stronggrowth potential

cost-effective



Three main categories of new

ICT-based applications of PLTEnergy

Services

Telecommunication services

value-added customer services



Fig.1 - PLT architecture



Fig.2-close look at house application



Fig.3-various applications of PLT



BROADBAND OVER POWER LINES

Broadband over power lines (BPL)

Can plug the computer into any electrical outlet in the

home, instantly have access to high-speed Internet Tested in several cities around the United States and the

United Kingdom

Two types of BPL service

In-House BPL

Access BPL



BROADBAND TO HOME

electricity and the RF used to transmit data vibrate at certain

frequencies

If electricity spikes at a frequency that is the same as the RF

then it will cancel out that signal and the data transmission

will be damaged en route

BPL bypasses this problem by using medium-voltage lines --

the data can only travel so far before it degrades



How BPL works?

special devices installed called repeaters take in thedata and repeat it in a new transmission, amplifying itfor the next journey

CT coupler allows the data on the line to bypasstransformers

Transformer's job is to reduce the 7,200 volts down to

the 240-volt standard some carry the signal in with the electricity on thepower line, while others put wireless links on the polesand send the data wirelessly into homes



WHY LIMITED EXPLOITATION?

PLT technology is young and still evolving; its capabilitiesstill need expansion

There is a lack of standardization and interoperability of PLT-relevant products

commercial incentives to exploit such a telecom

infrastructure as PLT not yet been clear

Increased PLT transfer speed and reliability is needed



PROBLEMS FOR PLT USERS

y could cause malfunctions of your electrical equipment,such as battery chargers, audio-video systems

y causes interference to important radio services, the user

might be held responsible for the damagey Since all users share the same physical access, data

sniffing can be done and security is a problem

y achievable bandwidth and download rate issignificantly lower than customers expect

y To receive telecommunication services and energy fromthe same company will create a dangerous newmonopoly



RECENT DEVELOPMENTS

More work required in the area of PLT hardware productdevelopment, production of appropriate standards andnew software applications

y improvements both in terms of capabilities(speed, reliability), investment and exploitationcosts, interoperability

y wide range of advanced software application in

need of further investigations and field testsy A number of associated regulatory and

standardization problems for commercialization



CONCLUSIONPLTopens up new opportunities for the mass provision of

local, last-mile access at a reasonable cost

offers a permanent on-line connection, as symmetric,two-way communication, has good performance, very good geographical coverage, relatively cheap

Faces problems -- PLT as a provider of the local accessinfrastructure,PLT-based development of applicationsand services

play a significant role as a provider of necessary Information Society local infrastructure



REFERENCES

www.howstuffworks.com

www.metering.com

www.wikepedia.org www.ncs.gov

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