Ukraine’s TSO announces transformer tender for 330 kV substations November 22, 2017 | Europe News Ukraine’s transmission system operator (TSO) Ukrenergo has announced a tender for the supply of a transformer for 330 kV Zaliutyne, 750 kV Zaporizka and 750 kV Dniprovska substations. This content is available to only paying subscribers. Username or E-mail Password Remember Me Forgot Password