Static voltage distribution of 126 kV modular multi-break vacuum circuit breaker prototype

In order to analyze the potential distributions of U-shaped arrangement 126 kV triple-break vacuum circuit breaker prototype, formed with fiber-controlled vacuum circuit breaker modules, and electric field distributions interior vacuum interrupters, three dimensional finite element models were established. The potential distributions and the electric field distributions interior vacuum interrupters of four models, including single pole prototype without supporting structure, single pole prototype with supporting structure, double poles prototype with supporting structure, three phases double poles prototype with supporting structure were analyzed with the established finite element models. The calculated results indicate that, under U-shaped arrangement, the static voltage distributions of the triple-break vacuum circuit breaker are non-uniform. The static voltage distribution of the high voltage break is more than 65%, and suitable voltage grading measures are needed. The supporting structure can be not installed in the circuit breaker in series prototype test.