Technical staff of Thanh Hoa 500kV Transformer Station regularly monitor equipment status to detect problems early.
The key role of the power transmission system through Thanh Hoa
Currently, the power transmission grid in Thanh Hoa province includes 2 500kV transformer stations (Thanh Hoa, Nghi Son), 5 220kV stations and more than 1,100km of 220 - 500kV lines. In addition, at the 110kV level and below, Thanh Hoa Electricity Company is managing 28 110kV transformer stations, 67 lines with a total length of more than 1,000km and more than 20,000km of medium and low voltage lines, serving more than 851,000 customers across the province.
With the increase in capacity after the 500kV line 3 from Quang Trach ( Quang Binh ) to Pho Noi (Hung Yen) and the 220kV line Nam Sum - Nong Cong are energized in 2024, the power grid through Thanh Hoa not only increases the ability to supply electricity to Nghi Son Economic Zone and industrial and residential areas, but also contributes to stabilizing power transmission from the Central region to the North during times of high load.
Before the dry and hot season of 2025, Vietnam Electricity (EVN) and the National Power Transmission Corporation (EVNNPT) have issued many directives to ensure safe operation of the power grid. The focus is on comprehensive inspection and maintenance of transformer stations and 220 - 500kV transmission lines nationwide, especially items on the 500kV Central - Northern line passing through Thanh Hoa. Units are required to carefully inspect important equipment such as transformers, circuit breakers, disconnectors, lightning arresters, capacitor banks, grounding systems and relay protection. Along with that, solutions to prevent overheating and handle hot spots on lines at risk of overload are promptly deployed. Local transmission units are also required to closely coordinate with dispatch systems to practice incident handling plans, review spare materials and complete the connection of imported power sources from China and Laos to be ready to respond to power shortages during peak periods.
Improving operational management efficiency at strategic transformer stations
The Thanh Hoa 500kV transformer station is a key node in the North-Central transmission grid. The station has recently completed the installation of a second 600MVA transformer, bringing the total capacity to 1,200MVA. This summer, the power output transmitted through the station reached 1,000MW, equivalent to 50% of the designed capacity.
Currently, the Thanh Hoa 500kV Transformer Station is equipped with many advanced technologies to ensure stable operation, especially during the hot season. The station uses a modern monitoring system, including a battery monitoring system, online ground fault monitoring, online oil monitoring and bushing system, helping operators monitor parameters and promptly detect potential problems. In particular, the station has installed a water and additive cooling system to reduce the temperature of the transformer, effectively supporting load reduction when there is an increase in temperature in the summer. These technologies help optimize the monitoring and maintenance of the station's operation safely and effectively, ensuring stable power supply for the entire region.
Checking equipment safety at 220kV Ba Che Transformer Station.
Station Manager of Thanh Hoa 500kV Transformer Station Dang Ngoc Hai said: “In the face of the sharp increase in load, we proactively shut down AT1 to reduce the load on AT2, maintaining stable system operation. The on-duty work is divided into 3 shifts rotating 24/24 hours, combining real-time parameter monitoring and periodic temperature checks to promptly handle any arising problems. Periodic maintenance and testing work is also carried out synchronously, with special attention paid to checking contact points, transformer oil, and cooling systems, to minimize the risk of incidents and maintain optimal transmission efficiency in hot conditions.”
At the 220kV Ba Che Transformer Station - which supplies electricity to the central urban areas of the province and the mountainous areas in the West, it has been switched to a remote operation model since the end of 2023. Thanks to that, remote monitoring and control are optimized, reducing incident response time and increasing system safety. Head of the mobile operation team managing the 220kV Ba Che Transformer Station, Phi Van Nghia, shared: "The 220kV Ba Che Station always maintains strict measures to ensure stable power supply, especially during the hot season. We have fully performed periodic maintenance and testing before June 2025 to ensure the equipment operates effectively. The shifts have been increased and divided into 3 shifts, 4 teams, working continuously 24/24 hours, to closely monitor the operating situation and quickly handle any incidents".
According to Deputy Head of Thanh Hoa Power Transmission Team Pham Ngoc Thang, the operation of new 220kV and 500kV stations in Thanh Hoa has significantly contributed to reducing the load on the power grid system and improving the ability to provide stable power for the entire province. These projects also help improve the flexibility and reliability of the inter-regional power transmission system, especially in the hot summer. To ensure stable operation of the power grid, the unit has implemented synchronous measures such as equipment maintenance, periodic testing and capacity adjustment. New technologies such as digital transformation and remote monitoring have also been applied, helping to reduce the workload for employees and improve operational efficiency; at the same time, continue to closely monitor indicators and quickly adjust if there are problems, ensuring safe and continuous power supply.
Thanh Hoa Electricity Company has also been proactively implementing many solutions for safe and stable power supply in the summer. In particular, focusing on maintaining the medium and low voltage grid, increasing shifts, regulating peak hour loads, and installing remote monitoring systems at 110kV transformer stations. The unit has also inspected and fixed problems at 100% of public transformer stations, and coordinated with localities to promote economical and efficient use of electricity. In addition, forecasting loads by day, week and month helps to proactively allocate and regulate power sources.
With the strong direction from EVN, EVNNPT and the synchronous participation of local grid management units, the power transmission system through Thanh Hoa is being strongly consolidated, ready for the goal of ensuring safety and continuity, contributing to maintaining energy security and socio -economic development during the peak season of 2025.
Article and photos: Minh Hang
Source: https://baothanhhoa.vn/bao-dam-truyen-tai-dien-an-toan-nbsp-lien-tuc-mua-nang-nong-253865.htm
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