Importance

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Abstract

Apparatus for coupling a high voltage power distribution system (2) to a communications device (14), the system (2) carrying electrical energy in the form of a high voltage at a power frequency and communications signals at a frequency higher than the power frequency, composed of: a capacitive power factor adjustment unit (4) connected to the distribution system (2) to correct for baseline loading and inherent reactance of the distribution system (2); a blocking unit (6) connected between the adjustment unit (4) and ground, the blocking unit (6) having an impedance which varies directly with frequency such that the voltage across the blocking unit (6) at the power frequency has a value substantially less than the high voltage at the distribution system (2) and the communications signal voltage across the blocking unit (6) has a value only slightly less than at the distribution system; and a signal coupling unit (10,12) having a low impedance at the communications signal frequency and connected between the blocking unit (6) and the communications device (14) for conducting communications signals between the distribution system (2) and the device (14).

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First Claim