The light rain is new, and a thunderstorm begins. At present, all localities and industries are working hard to grasp production and seek development, major projects are started in a centralized manner, and production and operation are pressed the "fast forward button". The State Grid Corporation of China resolutely shoulders the primary responsibility of ensuring power supply, coordinates planning, pre-planning, construction, acceptance and other links, strengthens on-site safety management, accelerates the construction of power grids at all levels, continuously improves the level of power supply services, makes every effort to serve high-quality development, and contributes to the promotion of Chinese-style modernization.
Kinetic energy The construction of UHV has been accelerated
Today, when the high-resistance area firewall protection liquid is painted, everyone should pay attention to fastening the seat belt, and the materials should be dispersed and stacked ...... properlyAt 7:30 on February 20, at the construction site of the Tongliang 1000 thousand volt substation located in Gaobei Village, Tongliang District, Chongqing, Wang Huang, project safety director of Chongqing Power Transmission and Transformation Company, emphasized the safety precautions for resumption of work to more than 100 operators.
Tongliang 1000 kV substation is the first UHV substation in Chongqing, which was fully resumed on February 20 and is expected to be fully completed and put into operation in December this year.
In order to ensure the full resumption of work on February 20, we arrived at the post 3 days in advance, sorted out and completed the resumption of work procedures one by one according to the requirements, and smoothly promoted the inversion of the plan, the arrival of key personnel, the entry of operators, training and examinations, on-site review, operation preparation and resumption of work permits. Chen Xianchao, project manager of Tongliang 1000 thousand volt substation construction, introduced.
Chongqing Tongliang 1000 kV substation project resumed work after the holiday, and the operators retested the GIS foundation in the 1000 kV area.
The machine roared, the crowd was crowded, and the operations on the project site were in an orderly manner. "The site will be dominated by electrical installation work, civil engineering and construction, with about 235 on-site operators and about 20 construction machinery. Liao Zhiwei, electrical construction project manager of Tongliang 1000 thousand volt substation, said.
After the completion of the project, the voltage level of the main grid of the southwest power grid will be increased from 500 kV to 1000 kV, and Chongqing will effectively undertake the transmission of hydropower in Ganzi and Aba areas in western Sichuan, ensure the demand for electricity, and promote the construction of the Chengdu-Chongqing Economic Circle.
China's energy resource base and electricity load center are inversely distributed, and the development of long-distance, large-capacity, low-loss UHV transmission is an inevitable choice. The transmission capacity of UHV projects is 3 to 4 times that of conventional UHV projects, and their role in the power grid is becoming more and more important.
This year, the State Grid Corporation of China proposed to accelerate the construction of a new power grid and build a strong digital and intelligent power grid. The UHV power grid is the backbone of the digital and intelligent power grid, and the physical foundation for the construction of the digital and intelligent power grid. At present, the State Grid has built a total of 35 UHV projects of "19 interchanges and 16 directs", becoming the world's strongest and largest power grid, with a trans-regional and inter-provincial transmission capacity of more than 300 million kilowatts.
At present, Jinshang-Hubei, Longdong-Shandong, Ningxia-Hunan, Hami-Chongqing 800 kV UHV DC project, Wuhan-Nanchang, Sichuan-Chongqing 1000 kV UHV AC project and 1000 kV UHV AC project, Beijing West Station, Shijiazhuang Station, Tianjin Station expansion project and other 9 UHV projects are in full swing.
Steady growth The grid structure continues to be optimized
As the economy continues to pick up, China's electricity demand will continue to grow steadily. The State Grid will further optimize and improve the grid structure, promote the construction of a new power system with a strong power grid with digital intelligence, vigorously improve the carrying capacity of the power grid, and ensure that the development of the power grid is always compatible with economic and social development.
At 8 o'clock on February 26, at the site of Tower 103, Section 2, Bid 2 of Jilin 500 thousand volt Shuangyang Power Transmission and Transformation Project, tower materials and tools were neatly placed on the blue tarpaulin, and the cloth control ball was installed in place. "Today's operation is ground assembly, which is a fourth-level risk operation, and everyone should pay attention to preventing risk ...... such as mechanical injuries and object strikesLiu Liangguo, the person in charge of the on-site operation, explained the content of the operation, danger points and preventive measures at the station class meeting.
Jilin 500 kV Shuangyang power transmission and transformation project construction site.
The 500 kV Shuangyang power transmission and transformation project is a key power grid project in Jilin Province's "14th Five-Year Plan", with one new 500 kV substation and 360 kilometers of 500 kV transmission lines, which are planned to be completed and put into operation by the end of 2024. After the project is put into operation, it can further improve the grid structure of Jilin Power Grid of "four horizontal and four vertical, east and west mutual aid", meet the needs of regional load development, improve the reliability of power supply of the power grid, and enhance the transmission capacity of "Jilin Power Transmission to the South".
The five basic conditions for resuming work and the 'seven-step method' for resuming work are both red lines and hard bars, and we must never allow missing items to be missed, let alone perfunctory. On February 23, at the meeting of the project department of the 2nd bid section of the 500 kV Shuangyang power transmission and transformation project, Wang Le, the construction project manager, emphasized the specific requirements for standardizing the resumption of work to all construction personnel.
After the Spring Festival holiday, the pace of resumption of work of Jilin power grid projects has accelerated, and 14 power grid projects have resumed work in the province. State Grid Jilin Electric Power Co., Ltd. organized all project responsible units to resume work in an orderly manner in strict accordance with the five basic conditions for resumption of work and the standardized process of "seven-step method" for resumption of work. At the same time, the company requires strict implementation of the "three verifications and four strict inspections" operator control compulsory measures, and urges the owner, construction, and supervision project departments to jointly verify the information of the operators entering the site, check the proportion of the original team returning to the site, the new team, etc., and upgrade the control of the new team. "Combined with the project resumption plan, we focus on strengthening the identification of personnel, equipment, environment and management changes at the project site, predicting the future safety situation of the project construction and the weak links in safety management, and eliminating the hidden dangers of accidents in advance. Li Xin, director of the Safety and Quality Division of the State Grid Jilin Electric Power Construction Department, introduced.
At the construction site of Tower 103 of the 500 kV Shuangyang Power Transmission and Transformation Project, Liu Liangguo led 12 team members to skillfully carry out ground assembly operations. They used more than 5,000 screws to assemble more than 800 pieces of iron and plates into 21 pieces of tower material, and then lifted them in batches by 25-ton cranes to assemble the tower, and the whole assembly process took about 5 to 7 days.
Our project department is responsible for the construction of the 184 base tower, and has completed the foundation construction of the 162 base tower, the ground assembly and low-section hoisting of the 11 base tower, and plans to complete all the tower assembly work before the spring ploughing. Wang Le introduced.
At the southeast corner of the cross of Xinghuo Road and Hongmiaopo Road, Lianhu District, Xi'an City, Shaanxi Province, at the construction site of the 330 thousand volt power transmission and transformation project in the center of Xi'an, nearly 100 workers are orderly dismantling and cleaning the underground space, the main formwork support, the secondary structure and tunnel support construction, etc., and the scene is busy.
Xi'an Central 330 kV Substation is the first 330 kV substation in the second ring road of Xi'an, and three 500,000 kVA transformers, 3 330 kV lines and 8 110 kV lines will be built in this phase. The project is expected to be ready for operation in June this year.
Liu Liqing, project manager of State Grid Shaanxi Xi'an Power Supply Company, said: "After the substation is completed and put into operation, it will provide reliable electricity for 280,000 residents, and at the same time can meet the new electricity demand in the central city of Xi'an, alleviate the pressure of power supply in the northwest of Xi'an, optimize the grid structure of the power grid in the central city of Xi'an, improve the mutual supply capacity of the power grid, and provide reliable power supply support for the construction of Xi'an as a national central city." ”
The power grid connects energy production and consumption, and is the network hub of energy transmission, conversion and utilization, which is directly related to the national economy and people's livelihood and national energy security. In the past few days, the construction of power grids in various places has ushered in a wave of resumption of work, accumulating new momentum for high-quality economic and social development.
In Jiangsu, Jiangsu Power Grid is expected to put into operation 313 projects of 35 thousand volts and above in 2024, with a total length of 2,984 new lines4 km, substation capacity 2273850,000 kVA, driving the innovation and development of raw materials, power supplies, high-end power equipment and other related industries, and making every effort to promote the sustained economic recovery.
In Zhejiang, Zhejiang Power Grid will start construction of 3,003 kilometers of transmission lines of 110 kV and above and a substation capacity of 25.84 million kVA in 2024, and put into operation 4,400 km of transmission lines of 110 kV and above with a substation capacity of 22.01 million kVA, which will strongly support power supply, improvement of people's livelihood and local economic and social development.
Stay safe and ensure the smooth operation of the power grid
Recently, the experimental verification center of NARI Group conducted a short-circuit breaking experiment of 800 kV UHV rapid circuit breaker in Changzhou Electrical Equipment Testing Center. This experiment marks the improvement of NARI's UHV equipment experimental capabilities, and provides reliable data support for the construction of new power systems.
This is the first time we have carried out an experiment with UHV equipment. With the deepening of UHV construction, there will be more similar high-voltage level experiments. Wang Haibo, head of the electrical equipment laboratory of NARI Group, said. Last year, the laboratory conducted a total of 19 UHV key equipment experiments, providing important support for the research and development of "stuck neck" equipment in the power grid.
According to reports, the 800 kV UHV fast circuit breaker project involves many power facilities such as DC charging devices, frequency modulation circuits, wall bushings, auxiliary circuit breakers, etc., with an experimental voltage of up to 1200 kV. NARI Group always puts safety in the first place, scientifically compiles experimental plans, formulates targeted risk control measures, and strictly follows the requirements of the "four checks and six looks" standard to ensure that the experiment is successful and the site is safe and controllable.
In order to improve the level of safety management, the Experimental Verification Center of NARI Group has formulated and improved more than 200 laboratory safety management system specifications, operating procedures, emergency plans and hidden danger standard lists in 2023. In view of the potential safety risks in the field of high-voltage experiments, NARI Group has also organized and carried out multiple rounds of comprehensive management of electrical fires and special inspections of high-voltage electrical experiments, realizing full coverage of the high-voltage experimental sites of 6 relevant units.
At the end of last year, NARI Group successfully passed the safety production standardization review in Nanjing, Jiangsu Province. Over the years, NARI Group has continued to strengthen the integration of work, continuously improve the comprehensive management system with ISO9000 as the core, and issued a total of 26 editions of safety production standards, comprehensively improving the standardized management level of safety production, and building a solid safety line of defense for the high-quality development of the enterprise.
State Grid Anhui Bozhou Power Supply Company maintenance personnel de-ice equipment at the 110 thousand volt Shuanggou substation.
Electricity is the blood of economic development, and power supply guarantee is related to the overall situation of economic development. Since mid-to-late February, many places across the country have ushered in the first round of cold waves in the Year of the Dragon, and the vast wilderness is covered in silver, and the safety of power grid equipment is facing the double severe test of harsh environments such as rain, snow and ice and peak electricity consumption.
In Bozhou, Anhui Province, after the Spring Festival, the production and operation of various industries were hot, and electricity consumption continued to rise. In order to ensure the reliable power supply of the power grid, the power maintenance personnel installed 122 anti-dance and anti-trip interval devices on 51 distribution lines with large dancing amplitude, and the power operation and maintenance personnel strengthened the inspection of key lines and equipment, carried out the analysis of dangerous points, found and dealt with equipment abnormalities and potential safety hazards in a timely manner, and made emergency rescue preparations in advance.
Zhao Hui, director of the power dispatching and control center of the State Grid Anhui Bozhou Power Supply Company, said: "In response to the new round of cold wave weather, we apply the remote intelligent patrol system and unify the snow and ice coverage of the 126 substations under its jurisdiction to carry out uninterrupted special inspections, and the power dispatching personnel on duty monitor the operation of the power grid in real time, adjust the operation mode of the power grid in a timely manner, and make every effort to ensure the reliable electricity consumption of the people's lives and the production and operation of enterprises." ”