Power line carrier communication

Power line carrier communication

Power Line Carrier Communication (PLCC) is mainly used for telecommunication, tele-protection and tele-monitoring between electrical substations through power lines at high voltages, such as 110kV, 220kV, 400kV.

In a PLCC system the communication is established through the power line. The audio frequency is carried by a carrier frequency and the range of carrier frequency is from 50kHz to 500kHz. The modulation generally used in these system is amplitude modulation.

The Audio frequency is in the range of 300 to 4000Hz. These Audio frequency is allocated in such a way that, it will include the audio signal,protection and the pilot frequency.

Connecting the PBX to the PLCC can make a network among this. Basically the electricity board in India have a network among them selfs using the PLCC and PBX.

Working: The human audio signal is converted/compressed into the range of 300 to 4000Hz AF, and this audio frequency is mixed with the carrier frequency. These carrier frequency is again filtered and amplified and transmitted. Around the clock a Pilot frequency (within AF range) will be transmitted and received by the plcc, this is done for the failure detection.

The transmition of these HF carrier frequency will be in the range of 0 to +32db. This range is set according to the distance between the substation.

ee also

* Power line communication

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