Thyristor valve for the 12-pulse converter for the Champa-Kurukshetra HVDC transmission scheme

This paper presents the design of the thyristor valve for the Champa-Kurukshetra 3000MW, ±800kV HVDC scheme. The thyristor valves are based on ALSTOM\´s H400 series valve design using 8.5kV 4" electrically-triggered thyristor technology and the scheme is the first application of the valve design for such a voltage level. Details of the valve configuration, the cooling circuit, as well as the protective strategy are presented. Detailed electrical ratings such as the steady-state and temporary overload capabilities, the fault current capability, as well as the valve capabilities to cope with the fault scenarios such as the loss of AC voltage are described. The thyristor valve design satisfies the requirements of the scheme.