26-09-2014, 09:39 AM
POWER LINE CARRIER COMMUNICATION
POWER LINE.ppt (Size: 670 KB / Downloads: 72)
INTRODUCTION OF R.S.E.B.
RAJASTHAN STATE ELECTRICITY BOARD
Started from 1 July 1957
It is a big organisation and it function under provision electricity act
The aim of RSEB is to supply electricity to entire Rajasthan state in most economical way
The target of board is to distribut energy in new areas as possible
For betterment and profit, privatization of
RSEB has been done recently . It has been
divided in five main parts, they are
1) Electricity production authority
2) Electricity transmission authority
3) Distribution authority for Jaipur
4) Distribution authority for Jodhpur
5) Distribution authority for Ajmer
INTRODUCTION OF PLCC
POWER LINE CARRIER COMMUNICATION
Power line carrier communication has been found to
be the most economical and reliable method for
communication medium and long distance.
GENERAL MODULATION PRINCIPLE
SINGLE SIDE BAND TRANSMISSION
CARRIER FREQUENCY IS SPACED ON A 4-KHZ
I.F. FIXED AT 16-KHZ
FULL DUPLEX MODE IS USED
LOWER SIDE BAND IS USED THROUGHOUT ALL COMMUNICATION
WAVE TRAPS
Wave traps – (WT’s) are used between the transmission line and the power stations to avoid carrier power dislocation in the power plant and cross talk with other power line carrier circuits connected to the same power station.
A wave trap must satisfy the following requirements:
1) It must block the carrier currents. By blocking the H.F. signals by at least 8 to 10 dB.
2) It must carry the power frequency current safely during short circuit fault conditions.
BATERRY CHARGER
This is the device that provide supply to the PLCC equipment for Un-interrupt working.
Battery Charger consist mainly four sections:-
Boost Charger
Float charger
Control section
Alarm section
DISADVANTAGES
1. Proper care has to be taken to guard carrier equipment and persons using them against high voltages and currents on the lines.
2. Reflections are produced on spur lines connected to high voltage lines. This increases attenuation and creates problem.
3. High voltage lines have transformer connections, attenuate carrier currents. Sub-station equipments adversely affect the carrier currents.
4. 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.
It is obvious that an effective power lines carrier system must overcome these difficulties.
CONCLUSION
A practical training for a period of 30 days
provided me with an in-depth knowledge about
POWER LINE CARRIER COMMUNICATION
(PLCC).