How can Chongqing Power Grid achieve disaster free

  • Detail

Chongqing electric power how to achieve a major disaster without major harm

since mid January, the southeast and northeast regions of Chongqing have suffered a large-scale continuous rain, snow and freezing disaster once in 50 years. According to incomplete statistics, there were 2355 tower and pole falls, 1619 broken or damaged lines, 4094 severely iced lines, and 851 distribution and substation facilities damaged in Chongqing power. However, Chongqing has not suffered from power collapse, large-scale power outages and casualties of rescue and relief personnel, realizing a major disaster without major harm

scientific response to disasters to avoid casualties

1 due to improper use of oil, on August 23, due to serious icing, the 220 kV Fuling Wulong west line of Chongqing Electric Power tripped after six power transmission tests. At this time, only the 220 kV Fuling Wulong east line is connected to the main phase, and the reliability of passing through our lens is very low. Chongqing Electric Power Company immediately set up an accident handling leading group headed by the company's main leaders, set up the Chongqing southeast anti ice rescue site headquarters, and mobilized more than 200 emergency rescue teams to the scene

during the on-site emergency line patrol, the headquarters found that: the 220 kV East and West lines of Fuwu in the same tower are located in the 5-kilometer section of chepanshan, Wulong County, with an altitude of 1000 to 1500 meters. A total of more than 30 iron towers (towers) are seriously iced. The on-site temperature is nearly minus 10 ℃, and the snow is more than 10 cm. It does not have the conditions for manual operation at all. If you are careless, the tower will fall and be disconnected, and people will be injured and killed, At the same time, the power supply of the 220 kV East and West lines of Fu Wu will be completely interrupted, and the normal operation cannot be restored within one month, which will lead to the power failure of 4 counties in the first district of Southeast Chongqing and the forced interruption of the main artery of the Chongqing Huaihua railway, and the large-scale disaster in Hunan and Guizhou will also recur in Chongqing

xukunyao, director of the production technology department of Chongqing Electric Power Company, said that the iron tower was seriously iced, and it was difficult to bear the impact of the new nuclear load and artificial deicing of workers on the tower, so the bearing capacity began to fall. Many iron towers on the East and West lines of Fu Wu were no longer qualified for boarding. At this time, if simple people sea tactics were adopted for tower climbing operations, tragedies would inevitably occur, and the consequences would be unimaginable. Therefore, the headquarters first made a careful analysis and locked the obstacle section in the three towers, then through on-site investigation, accurate calculation, carefully formulated the manual tower climbing work plan, and finally decided to send someone to the tower to eliminate the fault

however, the sag of the overhead ground wire of the three iron towers is too low. If emergency repair is arranged, the four counties in the first district of Southeast Chongqing may become isolated, and Chongqing power operation will face great risks. After careful demonstration, the company decided to carry out emergency repair on the 26th, and try to ensure the normal power supply in Southeast Chongqing. That night, the headquarters organized the detailed calculation, analysis and verification of the isolated operation mode in Southeast Chongqing overnight to prepare for the timely response to the comprehensive power outage. Due to adequate preparation and coordination, the 220 kV West Fuling Wuhan line finally returned to normal. Zhangchuncheng, general manager of Chongqing Electric Power Company, believes that scientific response to natural disasters has enabled Chongqing to resolve the risk of large-scale power outages

only by improving the design standards can we achieve disaster free

on New Year's Eve in 2005, the 220 kV Qianjiang Xiushan line in Southeast Chongqing suffered from icing disaster, resulting in Xiushan County running alone for one month, and the county only relies on 35000 kV lines and small hydropower to support basic lighting. This disaster warns Chongqing electric power that the design standard of once-in-30-year disaster should not be followed in power construction, but should be improved

after 2005, Chongqing Electric Power Company immediately transformed the Qianxiu line. The original design standard was 10mm icing, which was changed to 40mm after transformation. Xu kunyao said that during the ice and snow disaster, the loss of transmission lines in Southeast Chongqing that did not improve the design standard was significantly higher than that of lines that improved the design standard. For example, the design standard of 110 kV xiugao line and Wu Li line is 10mm. In this disaster, the icing of the line has reached 30mm, and the phenomenon of tower collapse and disconnection is serious; Although the 220 kV Qianxiu line was seriously iced after the design standard was improved, the tower did not fall and the line was broken

according to this idea, Chongqing electric power has built a 220 kV Baicheng line from Baihe Power Plant in Kai county to Chengkou County in Northeast Chongqing. According to the standard of once-in-30-year disaster, the ice bearing capacity of Baicheng line is only 10 mm, but the actual design standard of Baicheng line is 50 mm. Therefore, although some sections of Baicheng line crossing sanpai mountain and Xuebao mountain were covered with ice nearly 100 mm before the Spring Festival, they were in no danger and did not trip

the 500kV Zhangzhou long line from Zhangjiaba, Pengshui Miao and Tujia Autonomous County to Changshou District and the 220kV Fuwu line are in the same "corridor" and cross chepanshan side by side. The icing design standard of Zhangchang line is 10mm, and the design standard of Fuwu line is 20mm. As a result, six iron towers on Zhangchang line were broken at the waist, resulting in the power failure of Zhangchang second circuit line. After nearly two days of emergency repair, the power supply was restored. The Fuling Wuhan line did not fall, and finally stood the test

improving the design standard does not cost a lot.

improving the design standard by electricity does not improve the design standard across the whole line. Some sections are prone to icing due to high altitude; Although the altitude of some sections is not high, they have the meteorological conditions for icing; Some sections are no man's land, with mountains closed by heavy snow in winter, and the cost of emergency repair is high. Therefore, the design standard of these segments should be improved. It is verified that the reconstructed Qianxiu line is more than 100 kilometers long, and the line segment with improved design standards is less than 10 kilometers. Baicheng line is also more than 100 kilometers long, and the line segment with improved standards is only 4 kilometers. The investment per kilometer of the line segment with improved standards of the two lines is 1.5 million yuan higher than that of the original standard line

Xu kunyao said that in any case, the benefits of raising standards are greater than the investment. Once the line breaks down, the cost of maintenance and reconstruction is high. Generally, it is to restore it as it is, and dismantle it and carry out new reconstruction within a year. Therefore, excluding factors such as rising prices and increased labor costs, the cost of restoring and transforming lines is at least twice that of the original, which will have an adverse impact on the national economy and people's lives

many insiders believe that the ability of electricity to resist natural disasters should be improved, and higher design standards should be selected for high-voltage lines. When designing electricity, we should not only consider reducing costs, but also ensure the safe and stable operation of electricity. At the same time, the line design should follow the principle of combining universality with particularity, and the electrical design of special sections should be targeted to improve the design standard. (Yang Weicheng, Wang Jintao)

Copyright © 2011 JIN SHI