【作者】 唐小江；

【导师】 林莘； 李丕学；

【作者基本信息】 沈阳工业大学 ， 电气， 2002， 硕士

【摘要】 SF₆断路器从双压式、单压式发展到如今的自能式是断路器灭弧原理的一个重大飞跃。自能式SF₆断路器利用电弧阻塞效应即利用电弧本身的能量使灭弧室内SF₆气体的压力升高，在电弧过零时产生有效的气吹而熄灭电弧。这样操动机构仅需提供触头运动所需要的动能，从而大大减少了操作功，简化了机构，减小了灭弧室的结构尺寸，大大提高断路器的可靠性。所以对于自能式SF₆断路器的研制开发具有非常重要的意义。 本文针对126kV31.5kA自能式SF₆断路器的研制，建立了相应的灭弧室气压特性数学模型，对自能式SF₆断路器开断过程中电弧能量利用有重要影响的灭弧室缸径、喷口直径、动触杆开口位置进行了详细深入的理论分析和计算，并根据断路器开断中的满容量开断和近区故障开断的要求确定了灭弧室参数。采用ANASYS软件计算了灭弧室电场分布，并对冲击电压和工频电压下的最大电场强度进行了分析，确定了绝缘瓷套的尺寸。所设计的126kV31.5kA自能式SF₆断路器达到了小型化的要求。 针对自能式断路器的产品，本文设计了操作功小、零部件少、结构合理、噪音低、可靠性高的弹簧操动机构。在设计中分别对结构进行了选择和比较并确定了设计方案，并对弹簧的选择、疲劳强度、分闸线圈等进行了研究。 通过上述的研究和设计，本文制造了126kV31.5kA自能式SF₆断路器样机，根据国家标准要求，进行了型式试验，对断路器的开断试验进行了分析说明。试验结果表明126kV31.5kA自能式断路器具有良好的开断性能，也证实了此灭弧室结构设计的合理性。更多还原

【Abstract】 It is a very high advancement to the development from two-pressure arc-quenching chamber and single-pressure arc-quenching chamber to the self-energy arc-quenching chamber now for arc-quenching theory of SF6 CB make use of the arc blocking effect, namely arc-self-energy, to increase SF6 gas pressure in the arc-quenching chamber and get the efficient blasting effect to extinguish the arc when the arc current is zero. So the operation machine only provides kinetic energy needed for contactor moving, then operation power is decreased largely and machine is simplified. Consequently the structure and size of arc-quenching chamber are decreased and reliability of CB is improved greatly. So the development of self-energy SF6 CB is very important.In the paper, the math model of arc-quenching chamber air-pressure character is built on the base of 126kV/31.5kA self-energy SF6 CB’s exploiting, then the theory analysis and calculation is deeply been done for cylinder radius, nozzle spout radius and opening position of moved contact that they have the essential effect for the use of arc energy in the course of opening. Arc-quenching chamber parameter is confirmed according to the request of full opening and fault opening when the CB is opening. In addition, electric field distribution of arc-quenching chamber is calculated in adopting ANASYS software and the largest electric field intention is analyzed under the impulsion voltage and infrequency voltage, then the size of insulation porcelain cover is determined. Designed product reaches miniaturization request.The small operation power, few component parts, appropriate structure, low noise and high reliability spring operation machine is designed for self-energy CB. Choice and comparison of structure are done and the choosing spring, fatigue intension, opening coil and so on are studied in design.Through the research and design from the above, 126kV/31.5kA self-energy SF6 CB’s sample is manufactured in the paper. According to GB, type test is done and the analysis instruction of CB’s opening test is done. The test result indicates that 126kV/31.5kA self-energy SF6 CB has excellent opening character and also proves the reasonability of arc-quenching chamber structure design.更多还原