Switzerland’s Swissgrid awards 380/220 kV PST contract to ABB May 31, 2017 | Europe Company News Switzerland’s transmission system operator (TSO) Swissgrid has awarded a contract for the supply of a 380/220 kV, 800 MVA phase shifting transformer (PST) for Muhlenberg substation. This content is available to only paying subscribers. Username or E-mail Password Remember Me Forgot Password