Key Technology for Field Installation of 1 000 kV Transformers and Its Application

To implement the field installation of 1000 kV main transformer in the Southeast Shanxi substation, a lot of installation technologies for such a transformer with the highest rated voltage and huge single-phase capacity in China are researched: considering its structural features, the installation procedures of this transformer are optimized; the installation method of HV outlet devices and UHV bushings is improved; a method to rationally choose insulation oil processing equipment, whose performance can meet the requirement to the index of UHV insulation oil, is given; the evacuation of oil tank with huge volume, the drying technology of transformer body by hot oil circulation and the field insulation oil treatment under low temperature environment according to climatic characteristics of construction stage are researched in depth. These research results are available for reference to the installation of 1000kV main transformers.