A Study on High Current Arc Interruption by Multi-Channel Synchronized Diagnosis of Gas Temperature in Circuit Breaker Nozzle.

研究结果如下：(1)利用426.0和442.7 nm波长两条Fe谱线的相对强度，用双线法估计了平面型SF_6气淬室弧后通道内瞬态轴向温度分布。在实际实验中，在平面型SF_6气淬室中有意选用铁作为电极材料。通过测量这两条铁谱线的辐射强度，可以估计出电弧后的温度在3500 K以下，电流为零后100 μ s。(2)在光谱学的基础上，利用455.0 nm背景光谱对426.0 nm Fe谱线的相对辐射强度，提出了一种估算X_<Fe>的方法。通过对背景光谱系数的计算，发现455.0 nm处的背景光谱不仅有连续贡献，而且S_2光谱也有连续贡献。此外，在腔内沿电弧轴方向，X_<Fe>在电流零附近约为0.01%。(3)从弧后通道瞬态轴向电阻率分布的角度解释弧后通道的行为，提出了“热等离子体接触”的新概念。在电弧淬火期间，当速度超过100 m s^<-1>时，虚拟的“热等离子体触点”在轴向打开。此外，讨论了在2或3 V的TRV下热等离子体触点的行为，给出了热失效和成功中断的解释。(4)考虑非平衡效应，即双温效应，计算了SF_6等离子体的粒子组成和电导率。在粒子组成的计算中，提出了有效激发温度来表示高压和高温等离子体中重粒子在双温稳态下的内部态居数。研究了电子温度升高对SF_6等离子体粒子组成和电导率变化的影响。少

Following results are derived from this research project :(1) Transient axial temperature distributions in a post-arc channel in a flat-type SF_6 gas-blast quenching chamber is estimated from relative intensities of two Fe spectral lines at wavelengths of 426.0 and 442.7 nm by the two-line method. In the practical experiment, iron is intentionally used as the electrode material in a flat-type SF_6 gas-blast quenching chamber. Measurements of radiation intensities of these two Fe spectral lines make it possible to estimate post-arc temperature below 3500 K at 100 mus after current zero in the chamber.(2) A method for estimating X_<Fe> is developed on the basis of spectroscopy, which utilizes the relative radiation intensity of background spectra at 455.0 nm to Fe spectral line at 426.0 nm. From the calculation of the coefficients of the background spectra, it is observed that the background spectra at 455.0 nm have not only continuous contribution but also those of S_2 spectra. It is al … More so found that X_<Fe> is of the order of 0.01% around current zero along the arc axis in the chamber.(3) A new concept of 'thermal plasma contacts' is proposed in order to interpret the behavior of a post-arc channel from the viewpoint of transient axial electrical resistivity distribution in a post-arc channel. The fictitious 'thermal plasma contacts' are found to open in the axial direction during arc quenching period with the velocity exceeds 100 m s^<-1>. Furthermore, behavior of the thermal plasma contacts applied TRV of the order of 2 or 3 V mus^<-1> was discussed to give an interpretation on thermal failure and successful interruption.(4) Particle compositions and electrical conductivity of SF_6 plasmas are calculated considering the non-equilibrium effect, i.e.two-temperature effect. In the calculation of particle compositions, effective excitation temperature is newly proposed in order to express the populations of the internal states of heavy particles in high-pressure and high-gas temperature plasma in two-temperature steady state. The effect of an increase in electron temperature is investigated on the variation in particle composition and electrical conductivity of SF_6 plasmas. Less