Cable sheaths of power cables in the distribution networks are generally earthed on both terminals. This method avoids any dielectric stress of the sheath isolation by coupling voltage in the circuit sheath-to-earth. The same applies to the fieldcontrol electrodes of the sealing ends. This is an advantage for all dielectric field control system of cable terminals, considering capacitive, resistive or refractive controlled. The disadvantage is an additional power loss, caused by the current flowing in the circuit sheath-earth. The loss is dependent on the type of cable, the load current and the method of cable laying. For typical medium voltage-plastic-insulated cables the additional loss in the cable sheaths are about 2% up to 10 % of the total power loss of a cable connection.

Easily available and detailed area-related information is very valuable for the optimization of crop production processes in terms of, e.g., documentation and invoicing or detection of inefficiencies. The present study dealt with the development of algorithms to gain sophisticated information about different area-related parameters in a preferably automated way. Rear hitch position and wheel-based machine speed were recorded from ISO 11783 communication data during plowing with a mounted reversible moldboard plow. The data were georeferenced using the position information from a low-cost differential global navigation satellite system (D-GNSS) receiver. After the exclusion of non-work sequences from continuous data logs, single cultivated tracks were reconstructed, which represented as a whole the cultivated area of a field. Based on that, the boundary of the field and the included area were automatically detected with a slight overestimation of 1.4%. Different field parts were distinguished and single overlaps between the cultivated tracks were detected, which allowed a distinct assessment of the lateral and headland overlapping (2.05% and 3.96%, respectively). Incomplete information about the work state of the implement was identified as the main challenge to get precise results. With a few adaptions, the used methodology could be transferred to a wide range of mounted implements.

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