【作者】 钟建英；

【导师】 林莘；

【作者基本信息】 沈阳工业大学 ， 电机与电器， 2002， 硕士

【摘要】 由于SF₆气体具有优良的绝缘性能和灭弧性能，近年来SF₆气体越来越广泛地应用于高压断路器中。利用计算机辅助计算模拟开断过程中灭弧室内的气流场特性对于优化断路器的设计及节约试验费用具有重要的意义。 本文配合平顶山天鹰集团开发研制的252kV自能式SF₆断路器，建立了相应的灭弧室气流场数学模型，提出了一种利用流体计算软件和自编程相结合的方法对灭弧室内的气流场进行计算。对自能式SF₆断路器开断过程中电弧及气流场间相互作用进行了模拟，得到了各个时刻膨胀室的状态参数及灭弧室内气流场、电弧的动态特性。 本文分析计算了起始压力、膨胀室体积及喷口喉部直径的变化对断路器空载特性的影响，给出了断路器膨胀室状态参数及灭弧室内气流场在断路器开断过程中的变化，得到了自能式SF₆断路器固有的特性。 对断路器负载时的气流场特性进行了计算。说明了膨胀室压力上升的机理。分析了电流过零时喷口内电弧参数变化的原因，此外，从理论上对所研究的断路器的开断性能进行了分析。并且对同等级下压气式断路器和自能式断路器进行了比较，表明本文所研究的自能式断路器是可以利用电弧能量熄灭电弧本身达到减小操作功的目的。更多还原

【Abstract】 In these years, SF6 gas is widely used in the high voltage circuit breaker because of its excellent insulating and arc-quenching character .It is very meaningful to optimize the design of circuit breaker and save the expenditure of test by using the computer auxiliary computation.In this paper, The gas flow is simulated in the 252kV Self-Extinguishing Type SF6 Circuit Breaker which is being studied by the TianYing company in PingDingshan. The idea which combines the self-programmed method and the fluid computation software is presented. The interaction between the arc and the gas flow is simulated during interruption by using the idea. The state parameters of the expansion volume, the dynamic properties of arc and flow field parameters during the breaking process are obtained.The paper calculates and analyzes the influences of the initial pressure, the volume of the expansion chamber, and the throat diameter of the nozzle on the non-loaded performance of the circuit breaker, and presents the variation of the state parameters of the expansion volume and the flow field during interruption period, also predicts the nature of the self-extinguishing circuit breaker.The load performance of the circuit breaker are analyzed. The theory of the expansion volume pressure rise is predicted. Analyzing the variation of the nozzle arc parameters at current zero, In addition, analyzing the breaking property of the studied circuit breaker on the basis of the theory. The blasting circuit breaker and the studied self-extinguishing circuit breaker that are in the same voltage level are compared. It proves that the arc energy can be used to help build the pressure of the expansion chamber and extinguishing the arc in order to lessen the driven energy.更多还原