Energization of 900MVA Transformer Raises 500kV Di Linh Substation Capacity to 1,350 MVA
The commissioning of the 500kV – 900MVA AT1 transformer has increased the capacity of 500kV Di Linh Substation from 900MVA to 1,350 MVA, initially enhancing its capability to evacuate power generated by power sources in the region.
At 00:40 on October 31st 2026, Power Transmission Company No. 3 (PTC3), in coordination with relevant units, completed the acceptance testing and energized the 500kV – 900MVA AT1 transformer under the 500kV Di Linh Substation Capacity Upgrade Project.
The project is invested by the National Power Transmission Corporation (EVNNPT), with PTC3 responsible for project management. Under the approved project scope, the two existing AT1 and AT2 transformers, each rated at 450MVA, will be replaced with two 900MVA transformers, increasing the substation's total capacity to 1,800MVA. According to the project schedule, in November 2026, PTC3 will continue coordinating with the construction units to replace the existing 500kV – 450MVA AT2 transformer with a 900MVA unit. The project is expected to be fully completed within the month, bringing the total capacity of 500kV Di Linh Substation to 1,800 MVA.
In addition to replacing the transformers, the project also involves replacing 220kV equipment and busbars that no longer meet technical requirements; shifting the auxiliary power supply from 22kV to 35kV; renovating and supplementing the control and protection systems; and upgrading the SCADA and fire protection & firefighting systems to accommodate the new capacity scale.
Representatives of the relevant units witnessed the successful energization of the AT1 transformer
According to Mr. Dinh Van Cuong, Deputy Director of PTC3, prior to the project implementation, the two existing AT1 and AT2 transformers at the substation frequently operated at loading levels of 90% to 100% of their rated capacity. This increased the risk of equipment failures and constrained the ability to mobilize power generation sources in the region. Therefore, upgrading the capacity of 500kV Di Linh Substation is a key and urgent task aimed at strengthening the security of power supply and enhancing the power evacuation capability of power generation sources in the region.
The AT1 transformer was fully installed and ready for energization
Prior to energization, the Acceptance Council conducted a comprehensive review of the legal documentation, technical conditions, and all requirements for acceptance and energization, with the participation of representatives from the project owner, PTC3, and relevant units.
This achievement also forms part of PTC3's efforts in response to the 2026 emulation campaign entitled “100 Days and Nights of Accelerating Progress and Completing Key Power Transmission Projects”, launched by EVNNPT. The participating units have implemented their tasks in accordance with the guiding principle of “Clearly defined personnel, tasks, responsibilities, schedules, and results”, ensuring that accountability is assigned to each specific task while meeting the required standards for schedule, quality, and safety.
EVN.COM.VN
(https://www.evn.com.vn/d/vi-VN/news/Dong-dien-may-bien-ap-900MVA-nang-cong-suat-Tram-500kV-Di-Linh-len-1350MVA-60-13-510166)
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500kV Di Linh Substation Capacity Upgrade Project:
- Project Owner: National Power Transmission Corporation (EVNNPT);
- Project Management: Power Transmission Company No. 3 (PTC3);
- Supervision Consultant: Power Engineering Consulting Joint Stock Company 4 (PECC4);
- Approved Project Scope: The two existing AT1 and AT2 transformers, each rated at 450MVA, will be replaced with two 900MVA transformers, increasing the substation's total capacity to 1,800 MVA. The project also includes replacing 220kV equipment and busbars that no longer meet technical requirements; shifting the auxiliary power supply from 22kV to 35kV; renovating and supplementing the control and protection systems; and upgrading the SCADA, fire protection & firefighting systems to accommodate the new capacity scale.
- Implementation Schedule: In November 2026, PTC3 will continue coordinating with the construction units to replace the existing 500kV – 450MVA AT2 transformer with a 900MVA unit, with the target of completing the entire project and increasing the total capacity of 500kV Di Linh Substation to 1,800 MVA.
- Project Benefits: Upon completion, the project will enhance the power evacuation capability of power plants in the region, meet the electricity demand of Southern Vietnam, and support power transmission to the North under various power system operating scenarios.
The 500kV – 900MVA AT1 transformer was successfully commissioned and put into operation
PECC4 provided construction supervision consultancy for the 500kV Di Linh Substation Capacity Upgrade Project
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