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Research on Electric Field Distribution and Voltage Equalization Characteristics of Tensile Insulator Strings in 750kV Substation

In the design process of the 750kV substation, the design of insulator strings is an important part. The design of insulator strings needs to ensure that the voltage borne by each insulator does not exceed its maximum voltage, the surface electric field strength does not exceed the discharge field strength, and the maximum economic benefits can be achieved simultaneously. In this paper, finite element calculation software is used to study the electric field distribution and voltage distribution of tensile insulator strings in 750kV substations. The relationship between the depth of the grading ring into the insulator string, the diameter of the grading ring, the diameter of the grading ring and the electric field distribution and voltage distribution of the insulator string is studied, and the recommended size of the grading ring for the 750kV insulator string is proposed to reduce the surface electric field strength of insulator strings and improve the voltage distribution of each piece of insulators. The research results have been applied to the 750kV substation designed by our institute.