Recently, there has been snowfall in many places in Henan. The State Grid Henan electric power company launched the level IV emergency response to the low-temperature rain, snow and freezing disaster, closely tracked the changes of the cold wave and cooling weather, and made every effort to keep warm and ensure the safe and reliable operation of the power grid from the aspects of operation, maintenance and emergency supply.
In recent days, State Grid Henan electric power has strengthened the management and control of power grid operation risk and focused on the operation and maintenance of UHV power transmission and transformation equipment in accordance with the general emergency disposal policy of "protecting UHV, main grid, important users and people's livelihood"; Strengthen the ice condition observation of iced transmission lines, focus on special patrol inspection of icing and galloping risk lines, eliminate equipment defects in time, pay close attention to the icing and snow on the lines, prepare ice melting equipment in advance and take ice melting and snow removal measures in time.
On January 21, State Grid Henan DC Co., Ltd. organized 340 operation and maintenance personnel in UHV Zhongzhou converter station, Yunan converter station, Nanyang substation and Lingbao Converter Station to continuously carry out UV discharge detection of equipment in the station, prevent the risk of snow flash and ice flash, and ensure the safe and stable operation of large power grid.
On the 21st, the shuihongchi branch line of 10kV Ⅱ Zhengping line in shuihongchi village, Jiyuan encountered the bad weather of "strong snow + freezing rain" for many years, resulting in the power failure of 76 households in a village. "The tripping of shuihongchi branch line is mainly caused by the freezing rain on the line, and the line, fittings and poles are frozen together to form the line icing. The second is the freezing rain pressing branches to cause contact with the line grounding." Liang Baoping, head of Sili power supply service station of State Grid Jiyuan power supply company, said. After troubleshooting and emergency repair, the power supply of shuihongchi branch of 10kV Ⅱ Zhengping line was restored at 17:45 on January 22.
The sharp cooling and snowy weather also challenges the power grid security supply in Sanmenxia area. The 220 kV Zao line, zaozhai line and other transmission lines have light to moderate icing. Sanmenxia power supply company of State Grid has quickly eliminated hidden dangers of equipment by means of manual deicing of transmission line, deicing of laser deicing device, deicing of DC ice melting vehicle and so on.
According to the prediction of Henan meteorological observatory and Henan Electric Power Meteorological Observatory, from January 27 to 29, there will be rain, snow and freezing weather in many places in Henan Province. There will be heavy snow and blizzard in some areas, and the temperature will continue to be low, which may have an adverse impact on substation equipment. Transmission lines are prone to mild to moderate icing, and the probability of line galloping increases.
At present, State Grid Henan electric power has prepared enough emergency materials and personnel for emergency repair. 2434 emergency repair teams, 21000 three-level emergency repair echelons, 3791 emergency repair vehicles, 140 emergency electric vehicles and 1478 emergency generators in the province are on standby. For the damaged equipment caused by rain, snow and freezing weather, State Grid Henan electric power company will adhere to the principle of "rapid repair and restoration of power as soon as possible", actively use emergency power generation equipment and load transfer means, and give priority to restoring the power supply to important users such as water supply, heating, gas supply and transportation hubs that ensure the basic life of residents, as well as designated hospitals, fever clinics, production enterprises of prevention and control supplies and other important users of epidemic prevention, Provide strong power guarantee for the production and life of the people.
In addition, the State Grid Kaifeng power supply company revised the emergency plan for low-temperature rain, snow and freezing disasters in advance, carried out the "de icing" drill to deal with low-temperature rain and snow weather, and made every effort to ensure power supply in rain, snow and freezing weather. State Grid Linzhou power supply company launched level III emergency response to low-temperature rain, snow and freezing disaster on the 22nd, and carried out emergency disposal under bad weather in an orderly manner.
