With the continuous improvement of current levels in power systems, the demands on the breaking capacity requirements of vacuum circuit breakers are getting higher and higher. The breaking capacity of vacuum breakers ...With the continuous improvement of current levels in power systems, the demands on the breaking capacity requirements of vacuum circuit breakers are getting higher and higher. The breaking capacity of vacuum breakers is determined by cathode spots, which provide electrons and metal vapor to maintain the arc. In this paper, experiments were carried out on two kinds of transverse magnetic field（TMF） contacts in a demountable vacuum chamber, the behavior of the cathode spots was recorded by a high-speed charge-coupled device（CCD） video camera, and the characteristics of the cathode spots were analyzed through the image processing method. The phenomenon of cathode spot groups and the star-shaped pattern of the spots were both discovered in the experiment. The experimental results show that with the condition of TMF contacts the initial expansion speed of cathode spots is influenced by some parameters, such as the tested current, contact gap, the structure of the contact, the contact diameter, the number of slots, etc. In addition, the influence of the magnetic field on the formation of the cathode spot groups, the distribution, and the dynamic characteristics of the cathode spots were analyzed. It is concluded that the characteristics of the cathode spots are due to the effect of the magnetic field on the near-cathode plasma. The study of the characteristics of cathode spots in this paper would be helpful in the exploration of the physical process of vacuum arcs, and would be of guiding significance in optimizing the design of vacuum circuit breakers.展开更多
TMF（Thin Metal Film，金属薄膜电池）是一种全球强劲的大电流商用电池。GP100TMFSC型号是目前已经实现商品化的一种TMF电池（图1）。TMF电池由Bolder Technologies新加坡公司独家生产和销售。该公司拥有完全自主的美国专利技术（图2）...TMF（Thin Metal Film，金属薄膜电池）是一种全球强劲的大电流商用电池。GP100TMFSC型号是目前已经实现商品化的一种TMF电池（图1）。TMF电池由Bolder Technologies新加坡公司独家生产和销售。该公司拥有完全自主的美国专利技术（图2）。GP100TMFSC型号。是一种能够以200-500倍率大电流放电的卷绕式阀控全密闭铅酸蓄电池，该生产技术被认为是生产阀控全密闭铅酸蓄电池的一项重大技术突破。展开更多
基金supported by National Natural Science Foundation of China(No.51777153)
文摘With the continuous improvement of current levels in power systems, the demands on the breaking capacity requirements of vacuum circuit breakers are getting higher and higher. The breaking capacity of vacuum breakers is determined by cathode spots, which provide electrons and metal vapor to maintain the arc. In this paper, experiments were carried out on two kinds of transverse magnetic field（TMF） contacts in a demountable vacuum chamber, the behavior of the cathode spots was recorded by a high-speed charge-coupled device（CCD） video camera, and the characteristics of the cathode spots were analyzed through the image processing method. The phenomenon of cathode spot groups and the star-shaped pattern of the spots were both discovered in the experiment. The experimental results show that with the condition of TMF contacts the initial expansion speed of cathode spots is influenced by some parameters, such as the tested current, contact gap, the structure of the contact, the contact diameter, the number of slots, etc. In addition, the influence of the magnetic field on the formation of the cathode spot groups, the distribution, and the dynamic characteristics of the cathode spots were analyzed. It is concluded that the characteristics of the cathode spots are due to the effect of the magnetic field on the near-cathode plasma. The study of the characteristics of cathode spots in this paper would be helpful in the exploration of the physical process of vacuum arcs, and would be of guiding significance in optimizing the design of vacuum circuit breakers.
文摘TMF（Thin Metal Film，金属薄膜电池）是一种全球强劲的大电流商用电池。GP100TMFSC型号是目前已经实现商品化的一种TMF电池（图1）。TMF电池由Bolder Technologies新加坡公司独家生产和销售。该公司拥有完全自主的美国专利技术（图2）。GP100TMFSC型号。是一种能够以200-500倍率大电流放电的卷绕式阀控全密闭铅酸蓄电池，该生产技术被认为是生产阀控全密闭铅酸蓄电池的一项重大技术突破。
