Laboratory system automation for testing the influence of 20 kV power equipment on closed low voltage or telecommunication lines

Abstract

This paper presents a laboratory method and an original control solution used in order to compute the influence of High Voltage Lines and Equipment on Low Voltage ones at 20 kV. All voltage lines taken in consideration could be either regular 400/230 V AC supply lines or even classic telecommunication lines belonging to the HV power station or to other TC companies. High voltage overhead lines are parallel or crossed in the proximity of low voltage lines, so, they could produce strong electric/magnetic fields or resistive modifications on the low voltage facilities. These influences can induce interferences and could cause fatal injuries to humans operating on low voltage equipment (even on domestic appliances) or great damages to all electronic equipment (IT, TV, TC, domestic). Our goal is to present, first of all, an analytic method used to assess the values of some parameters like the capacitive current, the capacitive voltage, the psofometrical voltage, the longitudinal induced voltage as well as the resistive voltage component. This laboratory equipment could be used for teaching purposes and for studies and recommendations demanded for designing electrical lines. Conceived for industrial use, it was already tested in the university, as didactic tool. On the second part of our paper, we will describe the architecture of that system, both as hardware, as well as from the software applied.