Hence this research is focused on determining influences of high voltage cables on transient overvoltages in transmission grids. This is achieved by carrying out simulations with the electromagnetic transients program ATPDraw (EMTP-ATP).
Temporary overvoltages (TOV), slow front overvoltages (SFO) and fast front overvoltages (FFO) are being investigated in a grid model, extracted from the transmission grid. In the course of this the amount of high voltage cables is being increased, beginning at the momentarily situation of almost no high voltage cables.
This is supposed to result in confirmation of the currently used operating equipment and the design process of surge arrestors or in alternative specifications and additional measures. If necessary some recommendations for new test voltage levels for cables and cable accessories shall be made. Moreover different influences on resulting overvoltages, such as cross-bonding or sheath surge arrestors are going to be studied.