The icing of the most Thermal Power Regulatory Com

2022-10-16
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Electricity Regulatory Commission: the icing has greatly exceeded the fortification standard of power supply lines

People's Tianjin windows, February 5: a press conference was held at 10 a.m. on February 5, 2008 (Tuesday). The relevant person in charge of the State Electricity Regulatory Commission is invited to introduce the current situation of dealing with rain and snow disasters and rescue and power protection work, and answer questions

Hong Kong now station:

yesterday, the Meteorological Bureau held a meeting, saying that the storm, rain and snow came suddenly. Do you think the response of power supply is relatively passive this time? In the future, can you ensure that the power of the whole China will not be affected by these natural disasters? Otherwise, will it be a very dangerous signal for the country

tanrongyao:

I have just introduced in my speech that in view of the freezing weather of rain and snow, the CPC Central Committee, the State Council and relevant departments, as well as the power generation enterprises of the state power regulatory department and the power company, have intervened early, acted quickly and taken effective measures

since mid January, according to the requirements of the CPC Central Committee and the State Council, we have also seen the impact of the rain, snow and freezing weather on electricity. The State Electricity Regulatory Commission started the emergency plan on January 21, and the State Electricity Regulatory Commission is in a comprehensive emergency state, on duty 24 hours a day. Mr. Gu Junyuan is also invited to add some specific work progress

Gu Junyuan:

this question is very good. Now many foreign media have some different views on our work. The disaster mainly occurred on the 24th and 25th, and it was learned from the meeting that it will become more and more serious in the future. In fact, on January 19 this year, I personally saw an instruction made by Premier Wen Jiabao of the State Council on a weather forecast document, asking the country to make full preparations for the upcoming rain, snow and freezing weather. According to the deployment of the State Council, the Electricity Regulatory Commission announced that it had entered the emergency state of large-scale power failure since the 21st, and on the 22nd, we held a system wide safety video conference, which made special arrangements to deal with the freezing weather of rain and snow and the tight supply of electricity and coal. Of course, here I dare not say that our emergency mechanism is perfect, but the measures we have taken are very correct, and they are also non istronll85; The British Istron company makes it in time

Gu Junyuan:

however, we did encounter a very rare rain and snow climate with a very long duration and serious cumulative effect. According to our normal design standards and international practices, a large number of high-voltage lines are protected against natural disasters that occur once in 30 years. The once-in-30-year rain, snow and freezing climate means that the standard of anti icing of conductors shall not exceed 10mm. This time, we are mainly affected by the loss in the area from 25 degrees north latitude to 30 degrees north latitude. This area includes some areas of construction sand gb/t14684 ⑵ 001 in Sichuan, some areas of Yunnan, most of Guizhou, most of Jiangxi, some areas of Fujian and some areas of Zhejiang. Our fortification standard in these areas is generally once in 30 years, that is, between 10 mm and 15 mm

tanrongyao:

so we have some lines in these areas, such as the transmission line of Ertan Hydropower Plant. After this treatment, the road is in the heavy ice area, so the heavy ice area is increased to 20 mm. Just now, President Tan introduced that the average icing of the freezing rain and snow climate we encountered this time is about 30mm to 60mm, which greatly exceeds our fortification standard. I have a set of data here to tell you why our power supply lines are seriously damaged. According to the usual international practice, according to the fortification standard of 30-year return period, the vertical load borne by the 30mm tower is 170% higher than that of the 10mm tower. The longitudinal tension of the tower on the 30mm icing line is 100% higher than that on the 10mm icing line. Why did our tower fall more? In fact, the rare freezing weather of rain and snow has indeed exceeded our design standards, making the vertical load and longitudinal tension of the tower greatly exceed its design capacity, so the loss is indeed serious

tanrongyao:

some comrades may ask why they do not set up defense according to higher standards. If we fortify with 30mm ice, the material consumption of our tower will increase by 3.4 times. Our cost may be 2.6 times higher than the current cost. On the one hand, this is also a waste of resources. On the other hand, if we set up defense according to higher standards in the future, we will bear higher electricity prices. Now we are formulating fortification standards in accordance with the international practice. After this disaster, we need to make a serious summary to see whether it is necessary to improve the fortification standards in areas with more rain, snow and freezing climate. After the disaster, we may have to make a deeper summary in this regard

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