Affected by the cold wave, many places in southern areas have experienced a significant cooling, and some power lines in high-altitude mountainous areas have ice. At present, the yellow warning of cold wave in Southern Power Grid cold wave has been taken effect. The upgrade and renovation of 679 anti-ice and ice-resistant projects this year have been completed. All 144 sets of ice melting devices on the entire network have completed pre-test and fixed inspections and defect removal, and can complete the ice melting task and make every effort to ensure the stable supply of electricity.
html Starting from November 29, the cooling of many places in southern regions has reached more than 10℃. There was a significant cooling weather in the mountainous areas of northern Guangdong. The second station of the Power Transmission Management Bureau of Guangdong Qingyuan Power Supply Bureau organized machine inspections and line shifts to conduct special anti-icing inspections on the 220 kV Shan'an Line B, etc., and used drone to conduct refined inspections on the transmission line channels and poles and towers in the 51-back middle and heavy ice areas."When melting ice, the staff only need to operate the control box under the tower, and can complete the guide and ground wire series connection within 18 seconds, and flexibly and accurately melt the overhead ground wire." The person in charge of the Biotechnology Department of Qingyuan Power Supply Bureau said that the new automatic series connection device of overhead ground wire melting has been put into use this year, which has changed the previous operation method of manually climbing the tower to connect the ground wire and the conductor wire in series. The estimated operation time is reduced by more than 99% compared with the past.
"In response to the ice-covered and damaged situations in previous winter, combined with the ice-region distribution map, a total of 119 lines in the medium and heavy ice-covered areas in northern Guangdong were sorted out. In response to the low coverage rate of ice-covered monitoring devices, a list of recommended installations of ice-covered monitoring devices was formed." He Huan, a specialist in the Equipment and Environmental Monitoring Evaluation Institute of the Electric Power Science Research Institute of Guangdong Power Grid Company, told reporters that in order to more accurately monitor the ice conditions of the line, Guangdong Power Grid has comprehensively sorted out the blind spots of the distribution of ice-covered monitoring devices, and added 22 new online ice-covered monitoring devices. All of them have been connected to the production monitoring and command system, adding another "weapon" to ice-covered monitoring.
"The line has slightly ice-covered, the foundation of the tower is stable, and the screws are not loose." On December 1, Chen Yufei and others from Ruyuan Power Supply Bureau of Shaoguan, Guangdong came to Zhongchong, Sanyuan, Hongyun and other villages in Daqiao Town in the freezing rain, focusing on patroling the ice-covered towers and lines in special areas such as high-altitude areas, mountain tops, and large wind vents, and promptly deal with the ice-covered line to ensure normal power supply.
In terms of monitoring methods, the Southern Power Grid mainly uses online monitoring and artificial ice observation as the auxiliary, and at the same time uses drones and other means to improve the efficiency of line patrol work. "This year, we have transformed and upgraded the ice-covering module of the disaster prevention and mitigation monitoring and early warning system, and deployed the wire ice-covering prediction model independently developed by China Southern Power Grid for the first time, which can achieve the prediction of ice-covering thickness in the next 72 hours, accurately to the pole tower." Li Hao, deputy chief engineer of the China Southern Power Grid Production Technology Support Center, said that in terms of ice melting, China Southern Power Grid optimizes and improves ice melting efficiency according to one line and set of strategies, and minimizes the impact of ice melting on power supply.
text/Guangzhou Daily·New Flower City Reporter: Li Tianyan Correspondent: Huang Yonghua Kong Deqi Zhou Xiao
Photo/Guangzhou Daily·New Flower City Reporter: Li Tianyan Correspondent: Feng Hua Liu Weibin Yu Fangfang
Guangzhou Daily·New Flower City Editor: Chen Tingting
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