Fig.3 500kV thyristor valve

500kV thyristor valve

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The photo shows an outline of 500kV thyristor valve developed. The bridge consists of 4 series connected 6-pulse bridges and realizes 500kV dc. The thyristor valve shown here contains upper four arms of 4 series connected 6-pulse bridges. A 250kV dc valve base is attached at the bottom of the thyristor valve. The structure is self-standing deferring from the suspended type mainly adopted in the world. Many new technologies were developed to cope with sever Japanese seismic specification and other technical challenges including equal water distribution among a number of thyristors.

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