Wireless transmission system for transmission and distribution line maintenance information

摘要

PURPOSE:To make it possible to transmit the maintenance information of transmission and distribution lines by forming a transmitting slot with the synchronizing signal, which is obtained from the voltage waveforms of the transmission and distribution lines, using the slot as a permitted radio-transmission time zone, and transmitting the maintenance information. CONSTITUTION:A compact electrode 4 is arranged in close proximity with the lowest phase line 11. A voltage dividing circuit is formed using the stray capacitance formed between the transmission and distribution lines and the ground. The voltage waveform of the phase lines detected. A waveform shaping circuit 51 shapes the waveform of a detected sine-wave signal into the rectangular wave. The rising part of the wave is detected, and a slot synchronizing signal 8 is taken out. The signal 8 is supplied into a P/S converting circuit 54. Meanwhile, the maintenance information, which is detected with a sensor 52, is sent into the P/S converting circuit 54 as a transmitting data signal 9 through an A/D converting circuit 53. The P/S converting circuit 54 converts the data signal into the series binary-coded sequence in synchronization with a slot synchronizing signal 8. As a result, the transmitting data signal 10 is transmitted to the remote place with the transmitting slot as the permitted radio- transmission time zone.