THE APPLICATION OF THE PASCHEN DEVIATION TO THE OPERATION OF REPETITIVE HIGH PRESSURE GAS SWITCHES
THE APPLICATION OF THE PASCHEN DEVIATION TO THE OPERATION OF REPETITIVE HIGH PRESSURE GAS SWITCHES
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DOI：
10.1109/ppc.1993.514078
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发表时间：
1993-06
期刊：
影响因子：
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通讯作者：
S. Macgregor;F. A. Tuema;S. Turnbull;O. Farish
中科院分区：
文献类型：
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作者：
S. Macgregor;F. A. Tuema;S. Turnbull;O. Farish
强电负性气体（例如 SF 和 SF 气体混合物）表现出高度依赖于电场强度的净电离系数 (E)。因此，随着填充有电负性气体的火花隙的工作压力增加，降低击穿电压所需的场不均匀程度降低。这使得火花隙难以达到帕邢定律预测的静态击穿电压。可以利用这种效应来设计用于重复开关应用的火花隙，其中电极几何形状被设计为产生 V-p 特性的偏差，其方式与帕邢定律偏差类似。在 V-p 特性偏离点以上，开关的释抑电压几乎与压力无关。因此，当压力恢复到偏差点而不是恢复到开关中的环境值时，在适当高压下操作的火花隙将经历几乎完全的电压恢复。讨论了合适的电极设计并证明了恢复时间的改进。
Strongly electronegative gases such as SF, and SF, gas mixtures exhibit a net ionisation coefficient (E) which is highly dependent upon the electric field strength. Therefore, as the operating pressure of a spark gap filled with an electronegative gas is increased, the degree of field non-uniformity required to reduce the breakdown voltage decreases. This makes it difficult to operate a spark gap up to the static breakdown voltage which is predicted by Paschen's law. It is possible to use this effect to design a spark gap for repetitive switching applications in which the electrode geometry is engineered to produce deviation in the V-p characteristic, in a similar manner to Paschen law deviations. Above the point at which the V-p characteristic deviates, the hold-off voltage of the switch can become almost independent of pressure. Thus, a spark gap operated at a suitably high pressure will experience nearly complete voltage recovery when the pressure recovers to the point of deviation and not to the ambient value in the switch. A suitable electrode design is discussed and an improvement in recovery time demonstrated.