Possible sulfur hexafluoride (SF6) gas alternatives have been the focus of research and development in science and industry for many years. After the revision of the European F-Gas regulation 517/2014, the investigation has been even more intensified. One option for an approach for realizing an environmentally friendly switchgear for the high-voltage level is a combination of gas circuit breaker (GCB) and vacuum circuit breaker (VCB) in a series connection. Both switching concepts have advantages: the VCB can withstand very steep rising transient recovery voltages after current zero (CZ), while the GCBs are able to withstand high amplitudes of recovery voltage. In this investigation, the coupling and interaction of a series connection of a VCB and a GCB filled with carbon dioxide (CO2) is experimentally characterized in a basic study. The postarc current of the axial-magnetic-field-type VCB is identified as an important parameter influencing the interaction between both circuit breakers in the series connection and subsequently in the focus of the investigation. The different CZ behavior of a single VCB and a hybrid circuit breaker is compared. The voltage distribution across the two circuit breakers is the main assessment criterion for a series connection. In the first phase after CZ, the postarc current has a dominant influence on the voltage distribution; after that, a transition phase leads to capacitive voltage division phase. In order to control the voltage distribution, both capacitive and resistive voltage controls are investigated.

中文翻译：

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串联气体和真空断路器作为高压应用中的混合断路器

多年来，可能的六氟化硫 (SF6) 气体替代品一直是科学和工业研究和开发的重点。欧洲含氟气体法规 517/2014 修订后，调查力度进一步加大。实现高压级环保开关设备的一种方法是将气体断路器 (GCB) 和真空断路器 (VCB) 串联组合。两种开关概念都有优点：VCB 可以承受零电流 (CZ) 后非常陡峭的上升瞬态恢复电压，而 GCB 能够承受高幅度的恢复电压。在这项研究中，VCB 和充满二氧化碳 (CO2) 的 GCB 串联连接的耦合和相互作用在基础研究中通过实验表征。轴向磁场型 VCB 的弧后电流被确定为影响串联连接中两个断路器之间相互作用的重要参数，随后成为研究的重点。比较了单个 VCB 和混合断路器的不同 CZ 行为。两个断路器上的电压分布是串联连接的主要评估标准。在 CZ 之后的第一阶段，弧后电流对电压分布有主导影响；之后，过渡阶段导致电容分压阶段。为了控制电压分布，研究了电容性和电阻性电压控制。