16-01-2013, 03:42 PM
HIMACHAL PRADESH STATE ELECTRICITY BOARD LTD.
HIMACHAL PRADESH STATE.pptx (Size: 2.9 MB / Downloads: 64)
INTRODUCTION
The substation in Jassur is one of the largest power capacity grid substation in H. P. .
It has installed capacity of 220kV , which is taken from three feeders.
1.) Pong dam 2.) Baira Suel 3.) Ranjit Sagar Dam / Thein dam
This 220 kV is step down to 132 kV, 33kV ,11 kV and distributed to nearby areas.
Instruments like circuit breakers , lightning arresters , wave traps , bus bars ,instrument transformers are used.
POWER LINE CARRIER COMMUNICATION
used for telecommunication ,telemonitoring between electrical substations , through power lines at high voltages
uses amplitude modulation technique
Capacitor Voltage Transformer are used for PLCC
transmit communication signal and 50/60 Hz power signal through same electric power cable
SLDC (State Load Dispatch Center ) get information by using PLCC communication
WAVE TRAP
connected in series with the power transmission line
It blocks carrier frequency/waves (24 kHz to 500 kHz) on line
It allows power waves (50-60 Hz) to pass through it.
CURRENT TRANSFORMER
used for measurement of electric currents.
CT produces a reduced current accurately proportional to the current in the circuit
isolates the measuring instrument from high voltage circuit.
used in metering and protective relays.