Breakdown characteristics and influencing factors of live 500 kV insulators sprayed by extinguishing agents using helicopters

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-11-27 DOI:10.1177/07349041231213008

Jiazheng Lu, Tejun Zhou, Chuanping Wu

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引用次数: 0

Abstract

Regarding the problem that helicopters cannot spray live transmission conductors and wildfires directly under an insulator, we built a full-scale 500 kV insulator flashover test platform to simulate high-altitude helicopters spraying fire extinguishing agents. The chemical formulation, spray intensity, and fragmentation method of the fire extinguishing agents were varied. We simulated the breakdown characteristics of insulators when helicopters spray fire extinguishing agents, revealing the mechanism of high-altitude live fire extinguishment for high-spray-intensity and high-conductivity agents. Furthermore, an insulation performance verification test of a helicopter spraying live equipment at different flight speeds and altitudes was carried out, and the behavior of the fire extinguishing agents was divided into a five-zone diffusion law consisting of the (1) water column, (2) continuous water block, (3) semi-continuous water body, (4) large droplet particles, and (5) small droplet particles. We propose a spraying live transmission line method in which the helicopter flight height and speed jointly control the particle size of the fire extinguishing agent. When the particle size of the fire extinguishing agent at the terminal is controlled to 560–4000 μm, the insulation performance of the fire extinguishing agent can be effectively improved. During high-incidence periods of wildfires, such as the Spring Festival and Qingming Festival in 2023, on-site firefighting on the Hunan power grid was performed using helicopters to spray fire extinguishing agents from top to bottom through live transmission conductors to extinguish wildfire disasters directly below the transmission conductors. Neither transmission line flashovers nor power outages occurred when the fires were extinguished.

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使用直升机喷洒灭火剂的 500 千伏带电绝缘子的击穿特性和影响因素

针对直升机无法直接在绝缘子下喷射带电输电导线和野火的问题，我们搭建了一个完整的 500 千伏绝缘子闪络试验平台，模拟高空直升机喷射灭火剂。灭火剂的化学配方、喷射强度和破碎方式各不相同。我们模拟了直升机喷射灭火剂时绝缘体的击穿特性，揭示了高喷射强度和高导电率灭火剂的高空带电灭火机理。此外，还对直升机在不同飞行速度和飞行高度下喷射带电设备进行了绝缘性能验证试验，并将灭火剂的行为分为由(1)水柱、(2)连续水块、(3)半连续水体、(4)大液滴颗粒和(5)小液滴颗粒组成的五区扩散规律。我们提出了直升机飞行高度和速度共同控制灭火剂粒径的喷射活传输线方法。当终端灭火剂的粒径控制在 560-4000 μm 时，灭火剂的隔热性能可得到有效改善。在 2023 年春节、清明节等野外火灾高发期，湖南电网现场灭火采用直升机通过带电输电导线自上而下喷洒灭火剂，扑灭输电导线正下方的野外火灾灾害。大火被扑灭后，既没有发生输电线路闪络，也没有发生停电事故。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.