Use of temporary guying switch disconnectors in the medium voltage grid - aspects of single-pole switching

摘要

In the medium-voltage distribution grid of Westnetz GmbH, the temporary use of guying switch disconnectors installed under live working conditions has become more and more common. This allows for a more cost-effective discon-nection of line sections between two switching points for the purposes of carrying out work on the grid. Some abnormalities during switching operations with guying switch disconnectors have caused us to look into the electrical engineering process in greater detail. In doing so, we have examined more closely a potential impact on the operation of the grid and the safety of the switching staff. The relevant findings have been integrated into the development of a calculation tool. During preparation of the works, this tool is being used to carry out a feasibility check in terms of where the guying switch disconnector shall be installed and in what sequence the switching operations are to be arranged.