Computation And Experimental Research Of Pressure Character For 252kV SF6 Circuit Breaker

In the last ten years, the high-voltage switch is mainly designed by the industries their own in China, while absorbing advanced foreign technology to do the secondary development, SF6 high-voltage switch has become the leading products in industry, and the products are almost oil-free. But there are still many difficulties to be resolved in the R & D and manufacturing of ultra-high voltage circuit breakers, According to the requirement of UHV SF6 circuit breaker's development, at the background of the "The study of the 1100kV super voltage circuit breaker" item which is cooperated by Pinggao group Co.Ltd. and us, aiming at the theory and character of SF6 circuit breaker, selecting lower voltage class 252kV SF6 circuit breaker as research object, the mathematic model of pressure character of SF6 high voltage circuit breaker was built during the interrupting course, so the pressure build process is gotten under the no-load and high current condition. Then pressure feature in arc-quenching chamber of 252kV SF6 circuit breaker is measured, the mathematic model of pressure character and the calculation result are proved. Because the mathematic model of pressure character and calculation technique have general characteristic, the program can be used to UHV SF6 circuit breaker's development.According to concrete structure model studied, mathematic model of pressure characteristic is built in this paper .The pressure characteristic is calculated by FORTRAN during interrupting course. The pressure changing character in the pressure chamber is analyzed. As do the gas pressure, the temperature and the stroke of operation.Measure system of pressure feature is designed in this paper, four points of pressure change representation are selected, multiple tests of multipoint are realized. The test overall reflects pressure feature in chamber. Utilizing test result to prove theory, the conclusion is that theory calculation result is correct and feasible.Theory research in this paper as the base development, pressure feature test has guiding of design software package of breaker's significance for research of arc-extinguish performance and correlated theory in SF6 circuit breaker. This paper can be as base of domestic UHV electric network's building.