Influence of Water Mist on AC Breakdown Voltage Characteristic of Sphere-sphere Short Air Gap
陈宝辉1,2, 陆佳政1, 王博闻1, 胡建平1, 方针1, 黄守道2
1. 电网输变电设备防灾减灾国家重点实验室(国网湖南省电力公司防灾减灾中心),长沙410007
2. 湖南大学电气与信息工程学院,长沙410082
CHEN Baohui1,2, LU Jiazheng1, WANG Bowen1, HU Jianping1, FANG Zhen1, HUANG Shoudao2
1. State Key Laboratory of Disaster Prevention & Reduction for Power Grid Transmission and Distribution Equipment, Disaster Prevention and Reduction Center of State Grid Hunan Electric Power Corporation, Changsha 410007, China
2. College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
基金项目:
湖南省重点研发计划(2017SK2371);
博士后科学基金(2016M592424);
湖南省自然科学基金(2018JJ3004);
国家电网公司重大项目(5216A0180006);
Project supported by Key Research and Development Plan of Hunan Province(2017SK2371), China Postdoctoral Science Foundation(2016M592424), Natural Science Foundation of Hunan Province(2018JJ3004), Major Subject of State Grid Corporation of China (5216A0180006);
Water mist is a new kind of high efficient fire extinguishing technology. But its insulation performance has been lack of research. The diameters of water mist droplets are between 50 μm and 400 μm, which are larger than that of fog particles (diameter is less than 10 μm), but smaller than that of rain drops (diameter is larger than 1 mm). The influence of droplet size and distance between the droplets of water mist on the AC breakdown voltage of sphere-sphere short air gap were studied. The result shows that at a gap distance smaller than 1.5 cm, the breakdown field strength of water mist is lower than that of air, and the diameter of water mist is the main reason affecting the breakdown field strength of water mist. Water mist additives can improve the fire suppression efficiency of water mist. Thus, the influence of representative water mist additive KCl and fluorocarbon surfactants FC-1470 on the AC breakdown voltage were investigated. The results showed that, for the sphere-sphere short air gap whose size under the 1.5 cm and below, both the droplet diameter size and the distance between the droplets of water mist influenced the AC breakdown field strength. However, the former had more effect. In addition, the addition of strong electrolyte water mist additive KCl largely decreased the short air gap breakdown field strength of water mist (24.8%), and however, the addition of weak electrolyte water mist additive FC-1470 decreased the short air gap breakdown field strength of water mist at a relatively small degree (7.5%). This work studied the safety of water mist under the environment of high voltage to provide the theoretical basis for putting out electric power fires.
KEY WORDS :water mist;spheroid electrode;short gap;breakdown field strength;breakdown voltage;
图6
喷头a细水雾击穿特性随球-球电极间隙的变化
Fig.6
Effect of sphere-sphere gap on breakdown voltage and breakdown field strength (nozzle a)
图7
喷头a细水雾雾滴直径、雾滴间距与击穿场强的 变化规律
Fig.7
Effect of droplet’s diameter size and distance between the droplets of water mist on the breakdown field strength (nozzle a)
图8
喷头b细水雾雾滴直径、雾滴间距与击穿场强的 变化规律
Fig.8
Effect of droplet’s diameter size and distance between the droplets of water mist on the breakdown field strength (nozzle b)
图9
喷头c细水雾雾滴直径、雾滴间距与击穿场强的 变化规律
Fig.9
Effect of droplet’s diameter size and distance between the droplets of water mist on the breakdown field strength (nozzle c)
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