At 00:40 on October 31, 2026, Power Transmission Company 3 (PTC3), in coordination with relevant units, conducted acceptance testing and energized the AT1 500kV-900MVA transformer belonging to the Di Linh 500kV Substation Capacity Upgrading Project.

The project is invested by the National Power Transmission Corporation (EVNNPT) and managed by PTC3. According to the approved scale, the two existing 450MVA AT1 and AT2 transformers will be replaced with two 900MVA transformers, increasing the total capacity of the substation to 1,800MVA. According to the plan, in November 2026, PTC3 will continue to coordinate with construction units to replace the 500kV-450MVA AT2 transformer with a 900MVA transformer, striving to complete the entire project and increase the total capacity of the Di Linh 500kV Substation to 1,800MVA.

Relevant units witnessing successful energization moment of transformer AT1.

Along with replacing the transformer, the project also replaced equipment and 220kV busbars that did not meet requirements; converted the self-consumption power source from 22kV to 35kV; innovated and supplemented the control and protection system; and upgraded the SCADA and fire prevention and fighting systems to suit the new capacity scale.

According to Mr. Dinh Van Cuong, Deputy Director of PTC3, before the project was implemented, the two transformers AT1 and AT2 of the substation regularly operated at 90% to 100% of their capacity, increasing the risk of incidents and limiting the capacity to mobilize power sources in the area. Therefore, increasing the capacity of the Di Linh 500kV Substation is a key and urgent task to strengthen the assurance of power supply and relieve the capacity constraints of power sources.

AT1 transformer fully installed before power-energization time.

Prior to energization, the Acceptance Council conducted a comprehensive review of the legal documents, technical conditions, and requirements for acceptance and energization, with the participation of representatives from the investor, PTC3, and other relevant units.

This result is also part of PTC3's response to the "100-day intensive emulation campaign to accelerate progress and complete key power transmission projects in 2026" launched by EVNNPT. The units implemented the work according to the motto "Clear person, clear task, clear responsibility, clear progress, clear results," linking responsibility to each task and ensuring requirements for progress, quality, and safety.

Translator: Nguyễn Thị Lan Anh