基于脉冲定量纹影系统的正先导放电起始阶段通道瞬态温度测量

doi:10.19595/j.cnki.1000-6753.tces.221517

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Abstract The channel characteristic of positive leader is the basis for the switching overvoltage insulation coordination of ultra-high voltage power systems and the research of lightning discharge. The gas temperature in leader channel is an important physical parameter, which is coupled with the other channel physical quantities, such as electron density, electric field and conductivity. Obtaining the transient gas temperature of leader channel is of great significance for revealing the physical mechanism of leader discharge and supporting the equipment insulation coordination and the design of lightning shielding.
Based on the transient temperature measurement theory of quantitative schlieren method, the quantitative relationship among the sensitivity, light intensity, and spatiotemporal resolution of quantitative schlieren system was deduced. A method of using a pulsed current source to drive a LED chip to generate transient strong light to improve the spatiotemporal resolution of quantitative schlieren system was proposed. A pulse-driven quantitative schlieren system for transient temperature measurement of non-local thermal equilibrium discharge channels was developed, with temporal and spatial resolutions of 0.37 μs and 31 μm/pixel, respectively. Compared with the highest index of general quantitative schlieren system driven by a constant power light source, the temporal and spatial resolutions were increased by 1.7 times and 2.2 times, respectively, which solved the continuous measurement problem of channel transient temperature in long air gap discharge.
The experimental observations of the positive leader discharge in the 1.0 m rod-plate gap were carried out, and the data of discharge current, quantitative schlieren image, and channel optical image were obtained. The temperature distribution characteristics of stem were obtained by schlieren images: after the first streamer discharge occurred, the initial thermodynamic shape of the stem was a trapezoidal cylinder. The temperature of the stem decreased along the axial direction with the increase of the distance from root, and the root temperature was about 2 000 K, which was bell-shaped and symmetrically distributed in the radial direction. The gas temperature near the electrode tip showed a downward trend during the dark zone. At the same time, it was found that a thermal thin channel grew in front of the stem during the dark period, and the temperature in the thermal thin channel was between 400 K and 800 K. The radial diameter of the thermal thin channel was about 0.2 mm, and its development speed was about 0.1 mm/μs, which was comparable to the ion migration velocity in the channel.
The spatiotemporal distribution characteristics of gas temperature in unstable leader channels were obtained by quantitative schlieren images after the occurrence of secondary streamer discharge, and the macroscopic evolution mechanism was elucidated. The secondary streamer occurred at the head of the thermal thin channel, and the free electrons entered the electrode through the thermal thin channel and primary streamer stem. The collisions between electrons and neutral particles produced energy transfer, which made the radial size of the thermal thin channel expand rapidly, and gas temperature at the root of stem rose to 2 000 K rapidly, resulting in the occurrence of unstable leader discharge. In the relaxation stage of leader channel, the area larger than 2 000 K gradually narrows, and the channel electric field gradually recovers, which makes the voltage drop of the relaxation channel continuously rise, resulting in difficulty in triggering the subsequent discharge processes.

Key words： Leader discharge gas temperature quantitative schlieren stem thermal thin channel unstable leader

Received: 04 August 2022

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TM851

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	Cheng Chen
	Chen Weijiang
	He Hengxin
	Zhu Taiyun
	Fu Zhong
	Huang Yubin
	Wu Yutong

Cite this article:

Cheng Chen,Chen Weijiang,He Hengxin等. Experimental Measurement on the Transient Temperature Evolution of Positive Initial Leader Channel Based on Pulse-Driven Quantitative Schlieren System[J]. Transactions of China Electrotechnical Society, 2023, 38(23): 6483-6493.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.221517 OR https://dgjsxb.ces-transaction.com/EN/Y2023/V38/I23/6483

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