Record of the work of State Grid Jibei Tangshan Power Supply Company in meeting the peak summer demand

"Do you think it will be cooler after the rain? It's just a dry pot. Add some water and keep it steaming!" When friends in the circle of friends are joking about the current weather, and when everyone is infinitely relying on "air conditioning and watermelon" for a cool summer, every high temperature warning and lightning alarm is like a rallying call for a battle, reminding all power workers to "go to the battlefield and fight the summer peak."

In 2019, it is expected that the peak load of Tangshan power grid in summer will exceed 11.5 million kilowatts, an increase of 6.5% year-on-year. To this end, the State Grid Tangshan Power Supply Company (Tangshan Power Supply) has strengthened the operation management and risk control of the power grid, conducted key analysis and research on the special operation mode of the power grid, formulated preventive control measures and means, and minimized the operation risk of the power grid. In order to ensure the safe operation of the power grid, Tangshan Power Supply actively deployed the work of meeting the peak summer power supply. All personnel rushed to the forefront of the battle of meeting the peak summer power supply under the bright sun and through the storm. At the same time, we will do a good job in the "four preventions" in summer, carry out inspection and maintenance of power transmission and distribution equipment, and build and upgrade power transmission and transformation equipment, improve the operation capacity of the power grid, make every effort to prepare for flood control and emergency response, formulate emergency response plans for accident response for possible problems, and conduct anti-accident exercises. On this basis, the emergency command centers at the municipal and county levels will be activated to strengthen duty management, rapid handling of emergencies and information reporting, and ensure that personnel and materials are adequately equipped to ensure rapid and effective emergency response. Improve the quality of service, do a good job in handling 95598 work orders, ensure rapid response to repair reports, and ensure that emergency repairs are carried out in a timely manner.

Combining static and dynamic elements to build a safety foundation

"We must resolutely put an end to the idea of ​​complacency and make every effort to ensure the safe operation of the power grid and the reliable supply of electricity, and ensure that the work of meeting the peak load in summer is foolproof." At the meeting for meeting the peak load in summer held by Tangshan Power Supply on July 2, the relevant person in charge of the company said seriously at the meeting. Meeting the peak load in summer, safety comes first! All departments of the company immediately implemented the spirit of the meeting, combining action and stillness, and made every effort to create a safe environment for meeting the peak load in summer.

Actively "mobilize", comprehensively strengthen equipment inspections, and vigorously eliminate hidden dangers and defects. The healthy operation of power grid equipment is an important guarantee for the safety and stability of the power grid. In order to ensure safe and reliable power supply in the city during the peak summer period, Tangshan Power Supply has comprehensively strengthened the inspection frequency of lines and equipment, especially in continuous high temperature and thunderstorm weather, to effectively grasp the operating status of equipment, and at the same time strengthen hidden danger data analysis, grasp the existing safety risks and problems, form a closed-loop management mechanism, strengthen the risk control of the operation site, strictly manage the outsourced team, strictly implement the safety responsibility, strictly implement the post system, and vigorously build a long-term "anti-violation" work mechanism to ensure "people are on duty and their hearts are in place."

"Quiet" to nourish the body and mind, strengthen safety training and education, enhance the safety awareness of all employees, and create a strong safety culture atmosphere through the development of special safety classes, safety-themed activities, signing of safety commitment letters, and safety demonstration posts.

Prepare for a rainy day and strengthen the power industry

"Lift, OK, lower!" In the early morning of June 11, with the sound of commands, a brand-new ring main unit equipment landed steadily on the foundation, and the staff carried out the follow-up work such as switch installation and cable connection in an orderly manner. On the same day, the company's Zunhua Power Supply Station successfully completed the replacement of the Luan River Ring Main Unit and Renkang No. 2 Box Transformer in the urban area after more than 10 hours.

This is just a microcosm of Tangshan's power supply preparations for the peak summer this year. In recent years, the load in Zunhua, Tangshan has risen rapidly. Some power supply equipment has been overwhelmed due to aging, and the power supply is "tight", especially in urban areas where most lines are powered by hand-in-hand ring networks. Once a device fails, the entire line will trip and affect the load transfer. In order to ensure reliable electricity this summer, as early as April, the company promptly organized professionals from the Zunhua branch to centrally check the lines and equipment, comprehensively analyze historical reasons, dynamically predict load changes, and combine the current power grid operation mode to determine some ring network boxes and transformers with frequent failures, heavy loads, and aging equipment for renovation.

Up to now, the company has completed the equipment replacement project of 18 overload transformers, 33 low-voltage integrated transformers, 5 box transformers and 4 ring network boxes in the urban area, ensuring that the power grid equipment can withstand the severe test of high temperature, high humidity and heavy rain in summer.

Early morning operations ensure reliable power supply

At 1 a.m. on July 2, the night was deep, but at this time, the "night life" of the employees of Tangshan Power Supply Zunhua Power Supply Station had just begun. They had to start a race against time to adjust part of the load of the 10 kV Zunhua Transmission Line 523 to the Zunhua Transmission Line 514 and resume power supply before the early morning.

"This line has a high population density near Zunhua No. 1 Middle School and has many important users. Considering the heavy traffic here during the day and the operation of large maintenance vehicles can easily cause traffic jams, we have adjusted the operation time to the early morning. This way, the grid load is lower and it does not affect everyone's normal life." Chen Guang, a staff member of Zunhua Power Supply Station, introduced.

However, the early morning hours are the most tiring and difficult time for the staff, and the pressure of on-site safety management and control also increases. To this end, Tangshan Power Supply rationally allocates the personnel strength and working hours of Zunhua Branch, and each work leader carefully grasps the work intensity, working hours and physical condition of each work team member. Relevant leading cadres and safety inspection team members implement the post-in-place system, monitor the whole process, and strictly control the implementation of various safety measures on site. Not only for this construction, since the beginning of summer, Tangshan Power Supply has adjusted most of the planned power outages to the early morning hours, and carried out construction work during the low load period of the power grid to reduce the impact of power outages on users. For operations during the daytime, live operations are adopted if conditions permit.

"Since the beginning of this year, we have carried out live-line operations 25 times, which has exceeded the workload of the whole of last year. Especially in the past two months, in order to avoid power outages, we have combined live-line operations with distribution network construction to carry out work such as capacity increase that could only be carried out during power outages, thus minimizing the scope of power outages and ensuring normal power supply for users." said Wang Jie, head of the company's live-line operation team. This summer, Tangshan Power Supply will continue to vigorously promote live-line operations, "rather sweat than lose electricity", and deliver a steady stream of electric power for the cool summer.

Emergency drills improve practical skills

"The cable trench in the equipment area of ​​the 35 kV Shanligezhuang substation is seriously flooded, reaching more than 0.5 meters. There is a risk of backflow at the gate. Immediately organize the team to carry out rescue work and report the on-site situation at any time!" On June 26, a flood emergency drill kicked off at the Shanligezhuang substation in Zunhua, Tangshan. The participants strictly followed the actual combat standards and simulated the sudden danger. The maintenance team quickly assembled and rushed to the substation. One group of staff loaded sand and blocked the gate, and the other group took over, pumped and drained water. It took an hour to successfully complete the dangerous situation.

In recent years, severe weather such as continuous heavy rainfall and thunderstorms have occurred frequently, posing a great threat to the safe operation of the power grid. To this end, Tangshan Power Supply has comprehensively strengthened its emergency management system, made every effort to build an emergency repair team with rapid response, strong technical skills and tacit cooperation, improved various emergency plans, and carried out various forms of actual combat exercises such as flood prevention, large-scale power outages, and emergency fault repairs, so as to improve the emergency team's combat response capabilities and fully guarantee the safe and stable operation of equipment in the jurisdiction.