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DC Converter Transformer with the type of ZZDFPZ-297600kVA/±500kV（Y）is with the largest capacity at the 750kV class products in the world. It is operating at the altitude over 3000m. It’s parameters and performances take the leading among the same level products in the wolrd with characteristics of complex struture, large leakage of flux, Strong magnetic field, strict tempreture rise, long exterier insultion distance, low tempreture rise, low loss and noise.