Power Line Carrier Coupling Devices or Coupling Unit


The coupling devices, in conjunction with coupling capacitors, allow the transmission of carrier frequency signals and, at the same time, offer an efficient protection against the effects of the power frequency voltage and transient overvoltages for personnel and PLC equipment.

The coupling device comprising of the Line Matching Unit (LMU) and protective devices is used to couple PLCC terminals on the transmission line. The device is purely passive and is inserted between the low voltage terminal of the coupling capacitor and the co-axial/ Balanced connection to the carrier terminal.

The LMU together with the coupling capacitor is basically a band pass filter with a frequency band width of 35-500 Khz for a CC value of 4400 pf or 8800pf.









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