Electricity lights up a better life
Beginning on the night of December 15, the temperature in many places in the south plummeted by more than 10 degrees Celsius, and winter fell into winter in southern China overnight. At 16 o'clock on December 18, China Southern Power Grid Corporation launched a low-temperature rain, snow and freezing disaster level emergency response, according to the disaster prevention and mitigation monitoring and early warning system of China Southern Power Grid, as of 17 o'clock on December 18, a total of 417 lines of 35,000 volts and above in the power supply area of China Southern Power Grid, mainly distributed in Guilin, Guizhou, Liupanshui, Guizhou, Zhaotong and other regions in Guangxi, Guizhou, Yunnan and other regions, and 27 lines in Guangxi, Guizhou, Yunnan and other places were thawed and de-iced. China Southern Power Grid News sent three reporters to Zhaotong in Yunnan, Bijie in Guizhou, and Guilin in Guangxi to visit the safety and efficiency of ice melting in the power grid with the blessing of "black technology". As of press time, there have been no line trips, equipment damage and user power outages in the power supply area of China Southern Power Grid due to low temperature, rain, snow and freezing disasters. The staff of Guangdong Power Grid Shaoguan Lechang Power Supply Bureau carried out icing measurements. Photo by Liu Weibin
The staff of the Guiyang Bureau of the Southern Power Grid Ultra High Voltage Company carried out a special anti-icing inspection of 500 kV cattle from the heavy ice area of Line A and B. Photo by Han XuIce monitoring - real-time grasp of ice conditionsIn recent years, China Southern Power Grid Corporation has built a mature icing perception system of "first-class monitoring, supplemented by artificial ice observation". The icing** monitoring system independently developed by China Southern Power Grid Corporation can monitor the real-time icing, surrounding temperature and humidity of transmission line towers and conductors thousands of miles away. When the ice-covered area reaches the warning level, observers need to go to the ice-covered area to survey and confirm whether the ice-melting process has been initiated. Liupanshui, Guizhou: Icing early warning and monitoring are more effective for active anti-icing"There are 40 lines of 500 kV and below in the Liupan Hydropower Grid, and the maximum icing thickness is 1131 mm...."At 8 o'clock in the morning on December 17, Zhao Xuan, general manager of the biotechnology department of the Liupanshui Power Supply Bureau of Guizhou Power Grid Company, checked the data of the icing early warning monitoring system on the office computer and exported it to the dispatching, transmission and other relevant departments of the bureau and the county bureau. In the blast furnace village of Shuangjia Street, Zhongshan District, Liupanshui City, ice watchers Tian Weihai and Luo Mingsong carried out on-site ice observation operations on the 220 thousand volt Gaoming Loop Tower and its line section after more than an hour's trek. "The purpose of our on-site ice observation is mainly to verify and compare the data provided by the system on site, and at the same time to intuitively check and grasp the changes in the operation status of the line tower, such as whether the wire sag increases, whether the ice on the surface of the tower is thickened, etc. Tian Weihai introduced that they arrived at the ice observation point to calculate the on-site icing ratio and thickness, and provided on-site data for relevant departments to comprehensively analyze and judge and decide whether to carry out ice melting operations. At about 10 o'clock in the morning, through on-site observation calculation, the icing ratio of the line in this section was 03. The thickness is about 10 mm, which is basically consistent with the data of the icing early warning monitoring system, compared with the data of previous years, it is not very serious, and after multi-department analysis and judgment, it is believed that there is no need to melt ice for the time being, but it is necessary to pay close attention to the development trend. Based on the massive data of natural icing of transmission lines for more than 10 years, the icing early warning system uses deep Xi to study the icing data of the power grid, excavates the spatial and temporal distribution characteristics of icing, constructs a sample database of line icing image recognition, and uses AI technology to study the intelligent recognition of icing types and icing thickness images, so as to realize refined icing intelligent early warning based on historical icing laws. Wu Jianrong, the first monitoring assistant of the production technical support center of the Electric Power Research Institute of Guizhou Power Grid Corporation, introduced that as long as you tap the icing early warning system with the mouse in front of the computer, you can clearly see the real-time icing situation of the transmission line tower and conductor, the surrounding temperature and humidity thousands of miles away. "Monitoring through the icing** terminal allows the ice-melting unit to be activated or other de-icing measures taken as soon as the icing thickness reaches the ice-melting start-up threshold. According to the data of the icing forecast, the trend of the development of power grid icing can be effectively judged, which provides a basis for the next step. Wu Jianrong said. At present, the system has fully covered the lines of Guizhou Power Grid with a voltage level of 110 thousand volts and above, and has realized the sharing and sharing of "power grid + meteorology" business data. (Qian Lingyun Li Pump).DC Ice Melting - Ice Breaking can be done with one clickAs the main means of anti-icing in the current power grid, the principle of DC ice melting technology is to melt the ice of the transmission line by applying DC voltage to the transmission line and short-circuiting at the end of the transmission line, so that the conductor heats up. The ice melting device and technology independently developed by China Southern Power Grid Corporation have achieved a leapfrog breakthrough to realize "one-key start" and "one-key control" of DC ice melting, which has been widely applied in the cold wave in recent years and has become a powerful means of "icebreaking". Programmatic one-button sequential control saves 4 hours of ice melting
On December 17, the Zhaotong Power Supply Bureau of Yunnan Power Grid adopted the programmed "one-key sequential control" ice melting technology to carry out DC ice melting on the 220 kV west boundary wire and ground wire. Photo by Wu Xueqian
On December 17, the staff of the Ice Melting Dispatching and Command Center of Zhaotong Power Supply Bureau of Yunnan Power Grid carried out a programmed one-button sequential control of ice melting on the transmission line. Photo by Wan Long Wu Xueqian At 23:00 on December 16, the temperature in Zhaotong City, Yunnan Province was as low as minus 6 degrees Celsius, and vehicles on the road became scarce. The ice-melting dispatching and command center of Zhaotong Power Supply Bureau of Yunnan Power Grid Corporation is lively but orderly. The two employees in front of the computer right-clicked the mouse and clicked "one-key control", and the ice-melting device on the line 70 kilometers away began to work. The Zhaotong Power Supply Bureau of Yunnan Power Grid Corporation started the first ice melting this year. Chen Rongzhi, deputy general manager of Zhaotong Power Supply Bureau, said: "The ice melting line in operation is mainly for Yiliang County, which is a 220 thousand volt line about 64 kilometers long. This year, the ice melting dispatching and command center has adopted a programmed one-button sequential control ice melting technology, and after the cold standby state of the line is realized through the program, all links such as the ice melting system access line, the ice melting mode switching, and the completion of the ice melting current can be completed in the computer operation. It didn't take a lot of people to get to the scene, and after 7 hours, before dawn, the ice melt was complete. "Compared with the on-site manual operation mode, the one-button sequential ice melting technology can save 248 minutes. Up to now, a total of 25 lines of Zhaotong Power Supply Bureau have the conditions for full-process programmed ice melting. You don't need a large team of people to go to the site to get the cold to complete the work, and it is not a day to do it. Zhaotong is not a disaster-free adult, especially in winter, the freezing disaster is serious, and the ice melting of the line has long become the norm, and the average ice melting of the line is as high as 64 times every year. In 2009, the first DC ice melting device of China Southern Power Grid was put into operation at the 220 kV mark, and Zhaotong Power Supply Bureau entered a new era of DC ice melting. At its peak, 17 working groups and more than 80 people were stationed at 20 substations for a long time, and problems such as high operational risk, low operational efficiency, and line queuing for ice melting were prominent. "How to realize that the ice melting personnel can sit in the dispatch command center and carry out efficient ice melting operations through the computer? In order to achieve this goal, Zhaotong Power Supply Bureau started from the ice melting logic to explore new technical means. Wang Yichang, deputy manager of the power dispatching and control center of the bureau, said: "In 2020, we carried out on-site ice melting logic testing, and completed the one-click sequential ice melting test at the dispatching end through the transformation of pilot line equipment. After two years of practice, in 2022, we realized the one-click ice melting operation sequence generated by the point map, which is equivalent to greatly reducing the generation time of the ice melting operation sequence by improving the technical means of preventing misoperation at the dispatching end. Finally, there is this year's programmed one-button sequential control ice melting technology. If you don't go to the scene, how do you know the situation on the spot? Xu Wenlu, who is in charge of transmission operation of the Production Technology Department of Zhaotong Power Supply Bureau, pointed to the icing ** monitoring system and said: "We have it!" Saying that, Xu Wenlu called up the latest data, "Look at this tower, the icing ** monitoring device shows that the ground wire pull has increased by 942 kilograms, and the wire is 2443 kilograms, which is the weight of ice." "This system can not only see the ice ratio, ice thickness, real-time ambient temperature, maximum tensile force and other data, but also check the ice cover through the cameras on the line. The system also matches historical monitoring data and historical monitoring curves, which can assist decision-making. In addition, he has another "system" to collect information, one is an internal work group, which he named "Spring Blossoms - Night Watchman", and the personnel come from the Ministry of Biotechnology, Power Transmission and other departments to facilitate the collection of the latest information in real time. There is also a QQ group of ice watchers. There are 383 lines above 35 kV in Zhaotong, covering more than 7,200 kilometers, and we have set up more than 280 observation points on about 137 lines according to the icing situation over the years. These observation points are scattered and far away, and it is difficult to rely on grid employees to cover key times and key locations. Zhaotong Power Supply Bureau recruited more than 200 ice watchers who lived near ** Road in order to observe nearby. "Zhaotong Mountain is large, the regional differences of various meteorological elements are significant, and a variety of weather and climate types are intertwined and distributed. Mass ice watchers are very important because they provide information about the ice formation at our doorstep, which is an aid to our observation system and helps us to make informed decisions. After we melt the ice, the ice watchers will also go to the site to check the situation and complete the closed loop. Xu Wenlu introduced. Reporter Liu Jie, correspondent Wan Long, Wu Xueqian, Jia LiyaoGuilin, Guangxi: Hard-core ice melting "kills" rain and snow freezing
The youth commando team of Guangxi Power Grid Guilin Lingchuan Power Supply Bureau went to the icy area to carry out inspections. Photo by Lu Guohui In the 110 thousand volt Jinzhongwang line in the alpine mountains of Guilin Resources County in northern Guangxi, almost every time the low-temperature rain and snow freeze weather comes, it is always the first to freeze and be wrapped in "ice clothes". This time was no exception. Cold air arrived in Guilin on December 15, and ice began to appear on the Jinzhongwang line on the 16th. Cui Zhimei, a staff member on duty at the Production Command Center of Guangxi Power Grid Electric Power Research Institute, monitored the icing situation of the Jinzhongwang Line from a distance through the "clairvoyance" - icing monitoring and early warning system. "On the morning of the 16th, we monitored that the thickness of the ice covering the Jinzhongwang line had reached 147 mm, close to 50% of the line ice melting threshold. If the icing continues to increase, it may jeopardize the safety of the line. Therefore, we alert the Guilin Power Supply Bureau in time through the early warning system. Cui Zhimei introduced. Chen Yujie, deputy squad leader of the first shift of the operation and maintenance of the first transmission line of the Guilin Power Supply Bureau of Guangxi Power Grid Company, immediately organized personnel to observe the ice on the spot after receiving the icing information of the Jinzhongwang line. After investigation, the icing ratio of the Jinzhongwang line reached 49% of the ice melting threshold, and in the next step, it is urgent to start the DC ice melting device to reduce the burden of de-icing the line. Pang Jianyou, manager of the first substation management department of the bureau, organized personnel to apply to the power dispatching and control center for load transfer and line power outage in accordance with the previously prepared "one line and one book" plan for ice melting, so as to prepare for ice melting. At 15 o'clock on the 16th, all preparations were ready, and the staff started the DC ice melting device at the 110 thousand volt Wangtian substation, and first melted the ice of the optical cable at the high position of the 110 thousand volt Jinzhongwang line. As the wire current increases and the temperature rises above 0, the ice on the communication fiber optic cable of Jinzhongwang Line begins to fall off. Pang Jianyou said: "After the ice on the ground line of the fiber optic cable is melted and eliminated, we immediately melt the ice on the three-phase wires A, B and C. Due to the continuous low temperature, rain and snow weather, the Jinzhongwang line, which completed the first ice melting at 23 o'clock on the 16th, gradually began to ice again with the continuous low temperature. "By 16 o'clock on the 17th, the ice covering of the line reached the ice melting threshold, and we began to start the DC ice melting device to melt the ice for the second time on the Jinzhongwang line. Pang Jianyou said that if the cold weather continues, they will repeatedly melt the ice on the line several times until the ice on the line is no longer aggravated. In recent years, Guangxi Power Grid Corporation has vigorously promoted the configuration of ice melting short-circuit switches and the transformation of "one-key control" of ice melting in terms of ice melting automation. At present, 172 ice melting short-circuit switches have been installed in substations, shortening the ice melting wiring time by more than 80%; At the same time, the pilot completed the "one-key control" transformation of the 110 kV Jinzhongwang line, and the overall time of ice melting was increased by more than 30% compared with before the transformation, and the automation level and efficiency of ice melting operations were greatly improved. (Mao Yuxian, Chen Boxin, Zhu Jiang).Active front-line service - worry-free and warm winter with electricityLiupanshui, Guizhou: Ensure the safe use of electricity in coal minesRecently, Guizhou Guineng Investment Co., Ltd. Panzhihua Coal Mine, which walked into Jichang Town, Liupanshui District, although the minimum temperature was as low as minus 2 degrees Celsius, the mining area was still in full swing, and coal trucks were coming and going. Next to the raw coal pile, the coal blending system of the coal mine is roaring operation, and the raw coal transported out of the ground through mechanized mining hundreds of meters underground is reprocessed into thermal coal and then loaded and transported to various power plants, injecting strong power into the protection of thermal coal. In the power distribution room on the side, the party member service team of the Liupanshui Power Supply Bureau of Guizhou Power Grid Company is carefully investigating the potential safety hazards of electricity in the mining area, and learning more about the electricity demand from the coal mine staff, and providing some "good prescriptions" for safe and energy-saving electricity. In view of the low temperature and cold wave weather, the Liupanshui Power Supply Bureau formulated "one household and one book" for important users such as coal mines, railways, and hospitals in the early stage, and carried out a fixed value investigation of protection devices for 116 coal mine user substations in the city, so as to improve the reliability and stability of the coal mine power supply system. The bureau also jointly carried out the second phase of the coal mine protection device setting skills training course with the Liupanshui Municipal Energy Bureau, and carried out training for 260 coal mine management personnel and secondary operation and maintenance personnel in the city, and configured a "party member electric housekeeper" for each coal mine to tailor the electricity plan, so as to realize "one coal mine, one party member electric housekeeper, and a set of electricity plan" to ensure the increase of production and supply of coal mining enterprises. In addition to ensuring the safety of electricity and the stable operation of equipment in coal mining enterprises, the Liupanshui Water City Power Supply Bureau has set up a warm and power supply team of Nanwang Post Station to conduct safety inspections on the newly installed heating equipment in Haiping Primary School, Haiping Street, Shuicheng District, Liupanshui City, and at the same time replace new equipment for the school canteen, escort the safe use of electricity for the school, and ensure the warmth of the school in winter. It is reported that the location of the primary school is the highest altitude in Shuicheng District and the coldest in winter, this year, Haiping Primary School to take the air energy heat pump, heat sink mode, a total capacity of 54 kilowatts of electric heating equipment, room temperature can reach 16 to 20, at present, the school teaching area, teachers' apartments, student dormitory buildings have all been heated. (Qian Lingyun, Zhang Liang, Li Pump, Shao Jing, Ding Fang).News Feature: Hitting the Melting Ice FrontlineBijie, Guizhou: Start the ice melting device in 5 minutes
The staff of Bijie Power Supply Bureau of Guizhou Power Grid carried out the short-circuit operation of the 500 kV ice melting ground knife on the luxury line. Zhou Zhiwang, reporter from the Southern Net News Network, "According to the icing monitoring and early warning system, the icing of the 220 thousand volt Wuwei line reached 20 mm, and we immediately rushed to the scene. Early in the morning of December 16, Zhai Yong and Chen Kai, staff members of the transmission management department of Bijie Power Supply Bureau of Guizhou Power Grid Company, rushed to Yancang Town, Weining Autonomous County, Bijie City, Guizhou Province, to carry out ice observation and patrol work on the 220 thousand volt Wuwei line. The 220 kV Wuwei line is the length of the transmission line from the Wujiangyuan wind farm to the 220 kV Weining substation04 kilometers, 84 towers, most of the lines pass through high-altitude mountainous areas. When you come to the No. 7 tower of the line, the mountain, the tower and the line, as far as the eye can see, are covered with a layer of ice, and it is snow-white. Due to the high altitude of the tower, the temperature is close to minus 4 degrees. Zhai Yong and Chen Kai opened the car door, and a cold air hit. Stamping their feet, armed with their measuring tools, the two of them climbed towards the tower. "The wire was iced 20 mm and the temperature was minus 38 degrees Celsius, please record it. "Two people make observations, and one person records the data of the observations in detail. After summarizing the situation, Zhai Yong reported the on-site situation to the person in charge. According to the monitoring situation of the icing monitoring and early warning system and the on-site ice observation situation, combined with the weather trend, the Bijie Power Supply Bureau decided to adopt the DC ice melting method for de-icing the 220 thousand volt Wuwei line. Apply for ice melting operations, power outage operations, and ice melting wiring ......According to the ice melting workflow, the production technology department and the substation and transmission staff acted quickly to prepare for the ice melting. At 16:51, with the "one-key start" of the ice melting device by Liu Xing, the head of the Guanfeng Sea Patrol Maintenance Center of the Substation Management of Bijie Power Supply Bureau, the ice melting current gradually increased and the wire heated. "It's gone!"It's gone!"After 5 minutes, the ice on the attached ** began to fall. Zhai Yong, who observed the icing fall at the freezing point of Tower No. 7, reported the scene to Liu Xing through **. At 17:09, after receiving a notice from the freezing point that "all the C phase of the 220 kV Wuwei line was covered with ice", Liu Xing completed the commutation setting on the ice melting device and carried out DC ice melting on the remaining two-phase wires. At 18:19, the ice melting work of the 220 kV Wuwei line was successfully completed, which effectively guaranteed the safe and stable operation of the power grid. "With the continuous breakthrough of ice melting technology, our DC ice melting device has been upgraded in human-computer interaction and interface, in the past, it takes five steps to start the DC ice melting device, which requires high professional skills of operators, and the whole process takes at least 10 minutes to operate smoothly, if there are other hidden dangers, the time to contact experts for processing is immeasurable. Liu Xing said that now through the "one-button start", the whole process of device operation can be completed, that is, the DC ice melting device ice melting knife switch phase selection, circuit breaker closing, device charging, unlocking, lifting and other processes. According to Ban Guobang, the person in charge of the DC ice melting project of Guizhou Power Grid Company, the device only needs to click "Start Ice Melting", and the device can automatically complete the ice melting process from ice melting phase selection, lapping, closing, device pre-charging, unlocking, and uplifting. At present, the DC ice melting device equipped with Guizhou power grid can implement ice melting for 60 lines of 110 kV and above in Guizhou. Among them, the coverage of 220 kV and above lines reaches 982％。