Using remote-controlled unmanned aerial vehicles (UAV) with image recording equipment and specialized cameras in power grid management and operation at Lam Dong Power Transmission. Photo: Ngoc Ha/Icon.com.vn. From mid-morning to late-afternoon, the heat reached more than 40 degrees Celsius, blowing hot air in every corner from the countryside to the city, the demand for electricity increased continuously for many days and the transmission grid always at the full load warning threshold. In order to ensure the safe operation of equipment on the transmission grid, the National Power Transmission Corporation (EVNNPT) requires units to strengthen the inspection and monitoring of transformers, resistance, current transformers, etc. voltage transformers, pole clamps, connections on lines, substations. In particular, special attention should be paid to the full-load 500kV transformers such as Viet Tri, Hoa Binh, Nho Quan, Thuong Tin, PleiKu 2, Dak Nong, Vinh Tan and the North – Central 500kV lines. Troubled hot season Deputy Director of Power Transmission Company 3 (PTC3) Ho Cong said that by May 2021, the total installed capacity of solar power will be connected to the PTC3 transmission grid and the distribution grid of Power companies in the region. the area of ​​the provinces: Khanh Hoa, Phu Yen, Binh Dinh, Gia Lai, Dak Lak and Dak Nong has reached 4,093MW, accounting for 36% of the total installed capacity of power sources connected to the transmission and distribution grids in the region. this. In which, the connection at the voltage level of 500kV is 600 MW, at the voltage level of 220kV is 753 MW, at the voltage level of 110kV is 940 MW, and the farm and rooftop solar power connected at the voltage level below 22kV is 1,801 MW. With the very fast development speed of solar power plants, farm solar power, rooftop solar power in a short time, some 220kV transmission lines have been built in Phu Yen, Binh Dinh, Gia Lai and Dak Lak areas. and Dak Nong always operate at full load, overload occurs in the rainy season of the Central Highlands. Especially the 220kV transmission lines: Sinh Mass An Khe – Pleiku (100%); An Khe Biomass – An Khe Hydropower Plant (100%); Quy Nhon – An Khe Power Plant (99%); Quy Nhon – Tuy Hoa (96%); Tianjin – Nha Trang (98%); Nha Trang – Krong Buk (87%); Krong Buk – Pleiku 2: (88%) Dak Nong – Buon Tuahar (102%); Dak Nong – Buon Kuop (99%) and AT1 transformer (97.%), AT2 (96%) 500kV Dak Nong substation; transformer AT1 (94%), AT2 (95%) 500kV Pleiku 2 station; transformer AT1 (100%), AT5 (94%) 500kV Pleiku station… When the power grid is operating in a state of full load or overload, PTC3 must request units to increase the frequency of inspection and monitoring of equipment, transformers, lines and corridors to promptly overcome and handle handle unusual phenomena. In addition, some repair and maintenance works that need to be cut off or periodically tested must be arranged at night when solar power stops generating. The implementation of safety measures, as well as the process of construction supervision, supervision of load-bearing equipment, safety control at poles that cross with medium and low voltage lines and roads at it is dark, at night it will be very difficult, potentially dangerous. Khanh Hoa Power Transmission installed an AI camera to warn of fire in the corridor of the 220kV line: Nha Trang – KrongBuk. Photo: Ngoc Ha/Icon.com.vn According to the document No. 795/TTg-CN dated June 25, 2020 of the Prime Minister on adding the list of wind power projects to the electricity development planning, wind power plant projects in the Central Highlands region. with a total capacity of 2,358MW (accounting for 21% of the total installed capacity of power sources connected to the transmission and distribution grids in this area) is in the process of construction, installation, and putting these projects into operation. November 2021 will put more pressure on the existing transmission grid, which is already full and overloaded in the provinces: Khanh Hoa, Phu Yen, Binh Dinh, Gia Lai, Dak Lak and Dak Nong. In particular, in Gia Lai area, there is a total capacity of 1,242.4MW (voltage level 500kV: 200MW, 220kV: 650MW, 110kV: 392.4MW); Dak Lak area has a total capacity of 685.8MW (voltage level 500kV: 400MW, 220kV: 200MW, 110kV: 85.8MW); Dak Nong area has a total capacity of 430 MW (voltage level 220kV: 380MW, 110kV: 50MW), when put into operation, it will continue to overload 220kV lines of Yang Trung – Pleiku 2 wind power plant; An Khe – Pleiku Biomass, An Khe Biomass – An Khe Hydropower Plant; An Khe – Quy Nhon Hydropower Plant; Krong Buk – Pleiku 2, Dak Nong – Buon Tua shar, Dak Nong – Buon Kuop and AT1 and AT2 transformers at 500kV Dak Nong substation; AT1, AT2 500kV Pleiku substation 2. As a line soldier, the sun also goes to the line, the rain also goes to the line, as a station soldier, flood, or hot weather must be on duty 24/24. In order to mobilize sources effectively, in the current conditions, EVN requires the Power Transmission Companies to transmit the maximum mobilized capacity of the power plant cluster at 100% until the congestion or overload is reached. The associated load is removed. With this requirement, the new operating status of the PTC3 grid is often at 100% full load. Thus, it is necessary to keep the current flowing smoothly in all situations, especially on hot sunny days. With a “hot” area like PTC3, all units, regardless of whether they were on duty or off duty, must gather their manpower to check the grid’s congestion points, the points with high risk of heat generation. The point of line cross-section is small compared to the whole line, the rated current of the equipment in the exposed compartment is smaller than the line, the points have a large deflection, the risk of breaking the distance when the load is high..etc and so on and so forth. problems can occur when the temperature reaches more than 40 degrees Celsius and lasts for many days. It can be said that the transmission shifts during the heat wave are no different from the ones on duty during the flood season. After detecting the risk, it is necessary to propose to reduce the rated current of the line; if the ambient temperature rises suddenly, it is necessary to monitor that the conductor temperature does not exceed the allowable level; make a plan for temporary handling and a plan for long-term handling of bottlenecks of the power grid, determine the time for remediation, and submit it to the Company. For example, during the recent heat wave in May, the transmission units must make statistics of the number of enhanced inspections from the beginning of 2020, thereby proposing a reasonable plan to arrange human resources for the new operation situation; propose the addition of production equipment and tools to serve the operation management in the new operating situation, make a list of proposed equipment to be added immediately. A place to test people’s hearts Using remote-controlled unmanned aerial vehicles (UAV) with image recording equipment and specialized cameras in power grid management and operation at Lam Dong Power Transmission. Photo: Ngoc Ha/Icon.com.vn. Head of PTC3 Dispatch Department Nguyen Manh Tuong said that in the first 5 months of 2021, the electricity output received by the PTC3 transmission grid under management and operation reached 23,918,261,392 kWh, an increase of 16.30% over the same period in 2020; delivered electricity output reached 23,445,807,704 kWh, up 16.10% over the same period in 2020; power output received on the 500kV grid reached 17,223,481,412 kWh, an increase of 26.40% over the same period in 2020; electricity output delivered on the 500kV grid reached 17,000,463,190 kWh, up 26.26% over the same period in 2020; power output received on the 220kV grid reached 13,549,084,784 kWh, up 29.86% over the same period in 2020; electricity output delivered on the 220kV grid reached 13,299,649,317 kWh, up 30.08% over the same period in 2020. Despite this output, the transmission output of Power Transmission Company 3 (Khanh Hoa, Phu Yen, Binh Dinh, Gia Lai, Dak Lak, Dak Nong, Ninh Thuan, Lam Dong, Binh Thuan power transmission lines) assigned to Power companies under the Central Power Corporation (EVNCPC), the South (EVNSPC) and power plants (ND, DT, Solar, EIA) in the first 5 months of 2021, reaching 2,826,264,307 kWh, down 37.85% over the same period in 2020, accounting for 49.18% of commercial electricity output of 9 Power companies. The highest transmission power output in May is May 16, 2021 at 22,436,520 kWh. The main reason for the decrease in transmission power output is due to the performance of commercial power production of Khanh Hoa, Phu Yen, Binh Dinh, Gia Lai, Dak Lak, Dak Nong, Ninh Thuan and Lam Power companies. Dong and Binh Thuan under the Central Power Corporation (EVNCPC) and the South (EVNSPC) in the first 5 months of 2021 reached 5.746 billion kWh, a low growth rate, reaching only 0.67% over the same period in 2020. Meanwhile, the electricity output of 110kV solar power, 22kV farm solar, 0.4kV rooftop solar, small and medium hydroelectricity power generation to the distribution grid of 9 Southern Central and Western Power companies Originally belonging to EVNCPC, EVNSPC increased sharply in the first 5 months of 2021, reaching 5.010 billion kWh. The transmission output of renewable energy sources, medium and small hydroelectricity from the distribution grid, in addition to meeting the load demand of the Power Companies, is also transmitted to the transmission grid at 220kv substations of the Transmission lines. Khanh Hoa, Phu Yen, Binh Dinh, Gia Lai, Dak Lak, Dak Nong, Ninh Thuan, Lam Dong, Binh Thuan in the first 5 months of 2021 are 2.090 billion kWh, which means that the renewable energy output is reversed. to the transmission grid from the distribution grid of the power companies. Thus, the transmission grid under the management of PTC3, in addition to receiving power from the 500kV system and 220kV power plants in the area to supply loads, also receives back-generated output from the distribution grid through the distribution networks. 220kV transformers connected to the national grid cause full load, overload the 220kV grid. This is also one of the reasons for the full load situation for the regional transmission grid, and at the same time brings about the paradox in the operation of PTC3 that the transmission grid managed by PTC3 always operates in a poor condition. state of full load, overload, but the commercial power output did not meet the delivery plan. This shows that there has been an inadequacy when the planned transmission power output is not counted when the renewable energy output is back to the grid. Despite such difficulties, PTC3’s employees are always committed to the power grid and are responsible for their work. They memorized the characteristics of each area of ​​the transmission grid, each compartment of the substation. In the dry season, which columns are at risk of fire due to trees in the corridor. In the rainy season, which pillars are prone to landslide. Which residential areas often fly kites, stretch canvas to dry agricultural products… Just entering the third day of the second heat wave of summer 2021, the national electricity consumption capacity at noon on June 18, 2021, has reached a new peak of 41,709 MW, the PTC3 transmission soldiers are again straining themselves with the harsh climate. of the southern central provinces and the Central Highlands, with the transmission grid always in a state of 100% full load, but not allowing problems due to subjectivity – that is the duty and also the command from the soldier’s heart. Electricity transmission. The current must be kept smoothly despite the unresolved inadequacies, because the story of the mechanism, in order to be removed, still has to be discussed, considered, must be appropriate…and the mission of the transmission soldier is Under any circumstances, the current must be maintained. Because the difficulties that PTC3 is going through is also to test people’s hearts.

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As a unit of EVNNPT established on May 1, 1981, after 40 years of building and maturing, generations of leaders of PTC1 always care and invest in people, so that employees can own equipment, technology, ensure the power grid operation, safety, efficiency and quality assurance. Apply technology to check heat emission, detect the cause of the problem early Currently, the power grid managed by PTC1 is mostly transformers with large capacity (250MVA with 220 kV), (900 MVA with 500kV), along with oil resistance are the main equipment in the substations ( TBA). The company has widely applied online monitoring equipment to control the pressurized state under OLTC load, cooling system, current, pressure, oil … revealing the breaker of the company applying GIS, COMPACT technology, vertical compensation systems 500kV-2000A, new technology … is implementing the roadmap of gradually bringing 220 kV substations into remote control. The company is also the leading unit in the lead and acceptance of digital substations in Vietnam (220 kV Thuy Nguyen substation) and is assigned by EVNNPT to develop a process for accepting digital substations in the corporation. The development of technology and the rapid growth of the volume and scope of management requires that the qualifications of the staff be enhanced to meet the requirements. Accordingly, the company has identified training objectives for each specific target group with many types of training. At the same time, to alternate dispatching qualified, qualified and young staff members at substations, functional departments and regional power transmissions to the company’s technical department, while training in the form of mentoring, just participating in the work of acceptance of new projects to get an overview, synchronize and improve the level … Owning technology equipment The results of many recent years show that the company always ensures good implementation of the incident targets. The quality of human resources has been raised, creating conditions to arouse a movement to promote technical innovation initiatives in labor. In the past 5 years, the company has had 288 initiatives proposed to be applied in production, bringing an estimated value of several tens of billion VND, more importantly, initiatives and rationalization of production are all derived from practical needs of production. Thuy Nguyen 220kV substation (Hai Phong) is the first digital substation of EVNNPT managed and operated by PTC1. The appreciation of the human factor and creating conditions for each individual to improve their skills has helped the company to master equipment, technology and become more and more professional in management. By internal force, the company has successfully implemented a number of typical projects such as: replacing porcelain and accessories for the whole 220kV Hoa Binh – Ha Dong transmission line; overhaul and overhaul 500 kV transformers at Ha Tinh, Nho Quan and Hoa Binh stations … In addition to major repair works, the company has also successfully implemented many large-scale and complex construction investment projects such as: Raising the capacity of 500 kV capacitor line in Nho Quan- Ha Tinh; increase capacity of 500kV Thuong Tin substation; raising the capacity of the 220 kV transmission line Hoa Binh – Nho Quan … are all group B projects with total investment value of 300 to 450 billion dong. With efforts to care about people, the company has overcome many difficulties and always completes the assigned tasks. With the achievements in the past 40 years, PTC1 has been awarded many noble titles and awards by the Party and the State such as: Third Class Independence Medal in 2000; Labor Hero 2005; Second Class Independence Medal in 2007; First Class Independence Medal 2014.

Thuy Nguyen 220kV substation (TBA) includes 2 transformers (MBA) 220/110 / 22kV – 250MVA, and in this phase, 1 transformer will be installed. The 220kV side uses the diagram of two busbar systems with a ring busbar with 12 compartments. In this stage, equipment is installed for 7 lanes. The 110kV side uses the diagram of two busbar systems with a ring busbar with 21 compartments. In this stage, equipment is installed for 13 lanes. The station has an area of ​​about 40,100 m2 located in Dong Son commune and Kenh Giang commune, Thuy Nguyen district, Hai Phong city. This is a class I energy project of group B, with a total investment of more than 348 billion dong, invested by EVNNPT, the project is managed by NPMB, and operated by Power Transmission Company 1. Mr. Pham Le Phu, General Director of EVNNPT, said: Digital substations are not only new technology for Vietnam but also advanced countries. Before implementing the project, EVNNPT held many seminars with major equipment manufacturers in the world such as Siemens, ABB, and GE, but the number of 220kV substations was the same size as Thuy Nguyen 220kV substations using TBA technology. number is very few. Thuy Nguyen 220kV substation has the advantages of reducing copper cable by about 80%; reduce transportation, construction and installation of copper cables and reduce the area of ​​cable trenches; reduce the installation space of control and protection devices. Thuy Nguyen 220kV substation will ensure power supply for additional loads and meet socio-economic development needs of Thuy Nguyen district, Hai Phong city and surrounding areas, reduce power loss and strengthen connectivity. safe, stable and flexible in operating the power system.

The 110 kV side uses the diagram of two busbar systems with a ring busbar with 21 compartments, in this stage, installing equipment for 13 lanes. Thuy Nguyen 220 kV substation has an area of ​​about 40,100 m2 located in the area of ​​2 communes Dong Son and Kenh Giang, Thuy Nguyen district, city. Hai Phong. This is a class I energy project of group B, with a total investment of more than 348 billion dong, invested by EVNNPT, the project is managed by NPMB, and operated by Power Transmission Company 1. Thuy Nguyen 220 kV substation is the first substation in Vietnam. Photo: VGP According to Mr. Luu Viet Tien, Deputy General Director of EVNNPT, Thuy Nguyen 220 kV substation has the advantages of reducing about 80% of the copper cable; reduce transportation, construction and installation of copper cables and reduce the area of ​​cable ditch; reduce the installation space of control and protection devices. Mr. Tien also added that digital TBA is not only a new technology to Vietnam but also to advanced countries. Before implementing the project, EVNNPT held many seminars with major equipment manufacturers in the world such as Siemens, ABB, GE … however the number of 220 kV substations was similar in scale to the 220 kV Thuy Nguyen substations used for Current digital TBA technology is very few. The power supply and operation of the 220 kV Thuy Nguyen substation will ensure the power supply for the load and meet the socio-economic development needs of Thuy Nguyen district, city. Hai Phong and its surrounding areas, reduce power loss and strengthen connectivity, safety, stability and flexibility in power system operation. At the same time, in the process of investing and operating the 220 kV Thuy Nguyen substation, EVNNPT will summarize and evaluate the advantages, disadvantages, benefits, costs and investment efficiency of digital substations to serve as a basis for decision. select control technology, protect TBA in the future.