System for transmitting digital pulse signals over lines of a distribution network of AC power.

摘要

In this system, chirp-frequency-modulated mains-synchronised signal pulses are transmitted by the frequency-division multiplex process from a teleaction transmitter (21) in a substation (2) connected to a low-voltage network (16) to a teleaction receiver (22) in a central station (1). The input of this teleaction receiver (22) is connected via a coupling transformer (10) to a medium-voltage level feeding the low-voltage network (16). The frequency deviations of chirp signal pulses with adjacent frequencies are partially overlapping. The starting and concluding edges of the amplitude envelope of the chirp signal pulses have a predetermined, limited steepness in accordance with a cosine function. The substation (2) also contains a control circuit (24), a processing circuit (25), a resetting circuit (29) and a ripple-control receiver (19), and the central station (1) contains a teleaction analyser (23), a ripple-control transmitter (18) and a ripple-control centre (17). IMAGE