Abstract: In a system and a method for a simultaneous, legally binding, signing of a paper document and a digital document (50, 30), the paper and digital documents are provided with a single unique identity. A digital template document (20) is displayed and filled in with document specific data on-line, on the digital screen of a digital interface (10). The filled out digital document (30) is assigned a unique identity and a filled out paper original (50) of the digital document (30is printed (40), provided with the same identity. The digital document (30) is displayed on a connected digitizing means device (60), adapted for receiving a handwritten signature and for digitally reading, transmitting and storing location coordinates of a received signature in a connected database (100). The filled out paper- and digital documents (50, 30) are, via a signature assigning means, simultaneously signed.

Abstract: A method and a device for detecting ground faults in a network for distribution of electric power from a power station from which a number of lines, included in the network, emanate and where the ground fault current I.sub.J of each line is measured. According to this method, that line is selected (10) which shows the greatest active ground fault current I.sub.JR (8), alternatively the greatest ground fault current I.sub.J, or the greatest change in the ground fault current .DELTA.I.sub.J. Thereafter, the measured ground fault current, or the change thereof, in the selected line is compared (12) with at least one predetermined reference value (11). A fault indication is obtained (13) at a level exceeding the reference value.