![]() A PDP 11/34 microcomputer is used for programming, processing and storage of data on disk drives. ![]() High-frequency rejection filters and an insulating transformer are inserted in the power line. To avoid disturbances due to high electromagnetic fields, the recording apparatus is placed in a Faraday cage. Current-measuring devices based on Rogowski coils are used with a frequency-modulated optical system, with the possibility to transfer data from high potential to ground level. ![]() From voltage dividers with an insulation level appropriate for 420 kV networks, the signals are sent through light guides (amplitude modulated) to analog/digital converters. A transportable data-acquisition system for the determination of transient phenomena during switching operations in high-voltage networks was developed.
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