29-11-2012, 11:15 AM
POWER LINE CARRIER COMMUNICATION
POWER LINE CARRIER.pptx (Size: 354.05 KB / Downloads: 53)
INTRODUCTION OF RSEB
Rajasthan state electricity board started working from july1957.
This is the body of big organization act , like public limited companies.
The aim of RSEB is to supply electricity to entire Rajasthan state in the most economical way
INTROUCTION TO PLCC
PLCC is the method of transmitting information using power network.
It bridges the gap between electrical and
communication network.
We are able to construct intelligent buildings
containing many devices in Local Area Network
HISTORY
Came in operation in several countries after 1920.
Those days antennae ( similar to radio work) were used to couple the telephone system to the power lines.
The early PLCC system have now developed in to very complicated system which handle speech communication, teleprinter, tele-signaling etc.
BASIC PRINCIPLE OF PLCC
In PLCC the higher mechanical strength and insulation level of high voltage power lines result in increased reliability of communication and lower attenuation over long-distance.
Since telephone communication system can not be directly connected to the high voltage lines, suitably designed coupling devices have to be employed.
WAVE TRAP
Consists of a number choke coils connected in series.
It prevents carrier currents from entering to the power equipment.
Offer negligible impedance to power frequency & high impedance to carrier frequency
Coupling capacitor
It is a stack of capacitors connected in series.
Has highest possible surge withstand capacity, offer lowest series resistance at carrier frequency.
Used to mount the wave trap on it.