TELEMETRY SIGNALING SYSTEM OVER POWER LINES

This disclosure deals with a telemetry system adapted to be coupled to power transmission lines, the system generating pulses at one location on the lines and detecting such pulses at another location. The system is designed for use with transmission lines carrying alternating current from a power supply to a plurality of loads connected in parallel branch lines, and includes one or more pulse generators, each of which is associated with one load and, when energized, generates a series of pulses. The system also includes one or more pulse detectors each of which is coupled by current transformer means to branch lines leading to a load. The impedance of the power supply is much less than that of each of the loads, and therefore pulses generated on one of the branch lines are not sensed by detectors on the other branch lines because the supply serves as a low impedance shunt path across the other branch lines.