Abstract

The "Elektrizitatswerk des Kantons Obwalden" (EWO) have studied the possibility of integrating a new data transmission system in a medium voltage ~istribution network. The advantages ;oncerning the choice of optical fibre technology with respect to the specific considerations of energy distribution are pondered. In practice, the problem was to connect existing sub-stations with a new principal command center for management and remote control of the network. In other words, a new interconnecting structure of optical cables had to be installed, including opto-electronic interfaces especially adapted to the existing and commercially available equipment. The development of opto-electronic interfaces specific to this type of installation including modems and multiplexers used in binary data transmission is analyzed. The system commands and controls all he elements of the network such as the circuit-breakers, isolating switches, transformer stations, etc ... and insures the following principal functions: information output, procedure control, data acquisition, and automation.

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