Abstract: In order to improve the generalization of high-voltage AC tank circuit breakers and gas insulated switchgear (GIS) interrupter assemblies, an integrated design scheme based on external current transformers is proposed. By independently placing the current transformer outside the circuit breaker housing, the standardization and unity of the tank type circuit breaker housing and GIS arc extinguishing chamber housing structure have been achieved, enabling both to have the same flange interface and sealing structure. For matching conductive rod assemblies, a refined model of key components was established using 3D electromagnetic field simulation software, with a focus on analyzing the electric field distribution characteristics under lightning impulse voltage (1 050 kV) conditions, so as to improve the uneven electric field strength in the original scheme, and optimize the design of the conductive rod dimensions through simulation analysis, and carry out the relevant experiments on the results of the optimized design, which verifies the accuracy of the design.

    Key words: tank type circuit breaker; gas insulated switchgear; conductive rod; electric field