August 14, the Central Meteorological Observatory continues to issue the first 21 high temperature orange alert, southern Anhui, northwestern Hunan, Zhejiang and other places in parts of northwestern maximum temperature reached 40-41 degrees Celsius, the national grid company operating in the region continued to run high power load . In the most critical period of peak summer this year, the company distribution network performed well in general to maintain safe and stable operation of the people sent a cool ensure that local economic development.

Distribution network safe operation at high temperatures

Distribution network connecting millions of households, its impact on customer power supply reliability is most significant. State Grid Corporation distribution network operating region bears more than 99.9% of customer supply service mission, in the summer peak, facing a severe electricity supply situation is critical at the end of the distribution network security.

Research shows that the distribution network (especially in urban distribution network) electricity load affected by the weather quite obvious. In summer, the cooling load is growing rapidly, with larger peak time network security operating pressure. In addition, the low voltage distribution network, vulnerable to lightning, heavy rain, floods and other natural disasters; high temperature state, the device is also prone to heavy overload, the local temperature is too high and other security risks.

In this year's sustained hot weather effect, grid load rising fast, the State Grid Corporation of years of experience and distribution network management measures played an active role: investigation and management of risks to establish normal mechanism, defect case base continues to improve, repair and operations without power to gradually extend , status monitoring, early warning and rapid assessment of the further application of advanced control technology, more accurate positioning of the repair, the operation is more standard, the average outage time further reduce the time and fault ...... these efforts to ensure maximum safety and reliability of the distribution network , and satisfy customer demand for electricity. Thus, despite the high temperatures lasted for many days, but the situation did not occur in a wide range of power rationing.

Heavy load in high temperature, thanks to the good performance of the distribution network to improve its stability. State Grid Corporation of the first half of 10 kV Urban Distribution Network failure rate representing a decrease of 14.4%; urban and rural power grid reliability rate of 0.0207 and an increase of 0.124 percentage points, respectively. Reliability rate increase, reducing the failure rate, the "rise and fall" from one side reflects the distribution network of high temperature, high load capacity to enhance the response.

Future need to accelerate the construction of a strong distribution network

In recent years, the State Grid Corporation of increasing distribution network planning, construction and transformation efforts, with a significantly improved level of development of the power grid, the grid structure is weak in some areas, historical debts, "strangle hold" and other issues has been significantly improved.

While on the other hand, the current of electricity demand and load distribution network continued to grow rapidly, especially in recent years, high-temperature heavy rain and other inclement weather increased frequency, large area, the continuing hot weather load concentrated areas of power supply and demand situation continues tight, power distribution network security, reliability, adaptability have become increasingly demanding.

The more strong distribution network, the higher the level of development, ability to cope with a large load of high temperature, the stronger. In order to respond more effectively to the summer peak load, the urgent need to further strengthen the distribution network construction, to solve the problem of weak "two weak" in the distribution network, enhance the level of distribution grid development to meet the rapid development of urbanization, the electricity needs of diverse customers .

Future development of distribution network provides some inspiration this summer, hot weather and power grid load. In the field of planning, we need to adhere to the principle of moderate advance, leave enough load reserve. From August, the State Grid Corporation of the full implementation of the "distribution network planning design guide." Which states that the distribution network should have the necessary capacity margin, enhanced load transfer between all levels of the grid and mutual support. This will undoubtedly have a positive response to the distribution network to meet the objective needs of high-temperature heavy load.

Implementation of distribution network transformation and upgrading is one weapon to deal with large loads. Through the transformation and upgrading substations and line weight distribution network overload problems will be resolved, in front of a large load, equipment reliability will be significantly improved. The company has developed a "further promote the key cities distribution network construction and transformation of the work of opinion" to promote 10 key urban areas, 19 major cities in the core area with the construction of power grids. In addition, the company will also strengthen the county power grids, urban centers and industrial parks with a power grid construction, push forward the upgrading of rural power projects to solve the isolated operation and low voltage problems, improve grid efficiency.

According to the State Grid Corporation of planning, the county in 2015 to basically solve the power grid and the main network links and weak power supply "strangle hold" and low voltage problems; fully completed by 2020 to improve the structure, leading technology, efficient and interactive, flexible, modern and reliable distribution network, focus urban power supply reliability and voltage qualification rate reached the international advanced level. By then, more strong and reliable distribution network in response to a high temperature heavy load will play a more critical role.