Molded case circuit breakers (MCCBs) are used to provide overcurrent and short-circuit protection for low-voltage devices with rated currents of several hundreds of amperes. In MCCBs, some arc discharges have been observed to remain on the contacts and hardly move to the arc runners. Information about the temperature distribution over an air arc plasma is indispensable in investigating and clarifying such arc-commutation phenomena. We propose a new optical system that enables dynamic measurement of the two-dimensional temperature distribution over air arc via the two-line radiance ratio method. The system consists of a four hold-lens array, a high-speed video camera, and interference filters whose wavelengths correspond to the emission spectra of air arcs with metallic vapor. The dynamics of the air arcs in a mock MCCB was measured with this system. The anode root commutates to the runner, where its ambient temperature exceeds threshold T th , by contrast, there...

中文翻译：

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换向电弧流道的空气电弧的二维温度分布

塑壳断路器（MCCB）用于为额定电流为数百安培的低压设备提供过流和短路保护。在MCCB中，已经观察到一些电弧放电残留在触点上，并且几乎不移至电弧流道。在研究和阐明这种电弧换向现象时，关于空气电弧等离子体上的温度分布的信息是必不可少的。我们提出了一种新的光学系统，该系统可以通过两线辐射比方法动态测量整个电弧上的二维温度分布。该系统由四个固定透镜阵列，一个高速摄像机和干涉滤光片组成，这些滤光片的波长与带有金属蒸气的空气电弧的发射光谱相对应。使用此系统测量了模拟MCCB中的电弧的动力学。阳极根换向流道，流道的环境温度超过阈值T th，与此相反，...