Gagan ppt

ASEMINAR ON

PRACTICAL TRAININGTAKEN

AT 

POWER LINE CARRIER POWER LINE CARRIER COMMUNICATIONCOMMUNICATION

RAJASTHAN RAJYA VIDHUT PRASARAN NIGAM LIMITED

PLCC SECTION OF 132 KV,CHAMBAL G.S.S, JAIPUR SUBMITTED BY:

GAGANDEEP SING TOOR E&C (FINAL YEAR)

A.I.E.T ,JAIPUR

INTRODUCTION OF R.S.E.B. * RSEB started working from 1 July

1957

The aim of RSEB is to supply

electricity to entire Rajasthan state

in most economical way

The target of board is to distribute

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: RRVUNL

2)     Electricity transmission authority: RRVVNL

3)     Distribution authority for Jaipur: JVVNL

4)     Distribution authority for Jodhpur: JDVVNL

5)     Distribution authority for Ajmer: AVVNL

INTRODUCTION OF PLCCPOWER LINE CARRIER COMMUNICATION

Power line carrier communication has been found to

be the most economical and reliable method for

communication medium and long distance in a power

network.

GENERAL DESCRIPTION OF PLCC GENERAL DESCRIPTION OF PLCC EQUIPMENTS (ETI)EQUIPMENTS (ETI)

The multipurpose equipment type ETI-21 and ETI-22 transmit simultaneously speech and multiplexed Tele operation signals in SSB technique over high voltage lines of cables.

PARTS OF THE EQUIPMENT The equipment is built on three main parts:-

Low frequency multiplex signal

Carrier frequency signalPower supply unit

CONSTRUCTION1-It is built in MODULE ELECTRONICS

SYSTEM(MES)

2-There are two type of ETI Equipment:

a:ETI-21, b:ETI-22

ETI-21 use for 3wire,double channel

ETI-22 use for 4wire,double channel

MODE OF OPERATIONPLCC Unit Provide Five type of operation:

1:TELEPHONE FACILITES2:COMPRESSOR & EXPANDER3:EMERGENCY CALL4:SIGNAL BOOSTING5:SUPERVISION & ALARMS

GENERAL MODULATION PRINCIPLEModulation

Types of modulation:- Amplitude Modulation Frequency Modulation Phase Modulation

Demodulation

EQUIPMENTS USED IN PLCCIn PLCC the following equipments are used:-

PLCC StationLine matching unitCVT/CCEarth switchLightening ArrestorWave TrapCoaxial cable

SPECIFICATIONS OF PLCC1)GENERAL - Carrier frequency range :- 40 to 512 KHZ Useful AF band :- 300 to 3,700 KHZ

2)TRNSMITTERR.F.TRANSMITTING POWER;-peak envelope power :- 25w-side band power :- 15w

`3)POWER SUPPLY

-DC SUPPLY : 24 V

-CAPACITY : 800 AH

- POWER CONSUMPTION :< 80 W

BASIC PRINCIPLE OF PLCCBASIC PRINCIPLE OF PLCC

In PLCC the higher mechanical strength and insulation

level of high voltage power lines result in increased

reliability of communication.

Since telephone communication system can not be

directly connected to the high voltage lines, suitably

designed coupling devices have to be employed.

Coupling devices consists of high voltage capacitors in

conjunction with suitable line matching units(LMU’s) for line

impedance matching.

The basic arrangement of connecting the WT and coupling

capacitor in PLCC communication is shown in the figure

below –

TYPES OF COUPLING

Phase to ground coupling

Phase to phase coupling

Interline or inter circuit coupling

(a) ) PHASE TO GROUND COUPLINGPHASE TO GROUND COUPLING

(b) (b) PHASE TO PHASE COUPLINGPHASE TO PHASE COUPLING

(C) (C) INTERLINE OR INTER CIRCUIT COUPLINGINTERLINE OR INTER CIRCUIT COUPLING

WAVE TRAPSWAVE 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.

•WT’s also ensure proper operating conditions and signal levels at the PLCC transmit receive equipment irrespective of switching conditions of the power circuits and equipment in the station.

WAVE TRAP

LIGHTNING ARRESTERThe ground wires running over the towers

provides an adequate protection against lighting called L.A.

A good light arrester must pass the following properties:

1:It should not absorb any current during normal operation, but during over voltage surge it must provide an easy way to the earth.

2:After the over voltage discharge, it must be capable of interrupting the normal frequency of current from flowing to ground as soon as voltages reaches below break down value.

DIAGRAM OF L.A.

  BATTERY CHARGERBATTERY CHARGER  

PLCC (Power Line Carrier Communication) works on rectified AC or main. When supply goes off, we use BATTERY CHARGER for proper functioning of PLCC

  Battery charger mainly consists of 4 sections –

1.    Float charger

2.    Boost charger section

3.    Control section

4.    Alarm section  

ADVANTAGES

&

DISADVANTAGES

OF

PLCC

ADVANTAGESADVANTAGES22

1. No separate wires are needed for communication purpose. Hence

the cost is less.

2. Power lines usually provide the shortest route between the power

stations.

3. Power lines have large cross-sectional area resulting in very low

resistance per unit length

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.

CONCLUSIONCONCLUSION

A practical training for a period of 30 days

provided me with an in-depth knowledge about

POWER LINE CARRIER COMMUNICATION

(PLCC).

THANK YOU

QUERIES ?