Current transducer arrangement for outdoor high-voltage installations

摘要

To increase the availability of current transducers for outdoor high-voltage installations, an electronic signal processing device for the measurement signal of the current transducer is arranged above the current transducer as a block which can be removed from above within a transducer head casing which is painted on the outside. The electronic signal processing device is attached to a coverplate, which is aligned parallel to a primary conductor of a magnetic shield casing, which is surrounded by an electrical shield casing. The signal processing device consists of low-power electronics below and power electronics above the coverplate; it converts analog signals of the current transducer into digitized and encoded signals for serial transmission by means of a fibre-optical line. The power electronics are in good thermally conducting contract with the coverplate of the electrical shield casing via a metal plate. Lower and upper ventilation slots are provided at the transducer head casing. To keep any temperature increase due to solar irradiation low, radiation reflectors of polished and degreased aluminium are located at a distance of 3 cm between transducer head casing and electrical shield casing.