500 kV 900 MVA transformer at the 500 kV Son La substation
This is the power project of group B, and under special level with a total investment of nearly VND 312 billion invested by EVNNPT, managed by the Central Power Project Management Board (CPMB) on behalf of EVNNPT, constructed by Power Construction Company No.1 and tested by One-member Northern Electrical Testing Limited Company. Power Transmission Company No. 1 shall take over and operate the transformer.
The project scope consists of replacing two existing 500/220/35kV-450 MVA transformers with two 500/220/35 kV-900 MVA transformers; improvement, supplementation and replacement of related items in conformity with the replacement of new transformers. The project was implemented in the fence of the existing 500 kV Son substation at Pieng and Ten villages, Pi Toong commune, Muong La district, Son La province.
The energization of the 500 kV - 900 MVA transformer AT2 at the 500 kV Son La substation was significantly important to release power from the North-western hydropower plants to the national power system, to meet the load demand of the North and the whole country and improve the power quality of the grid in the area, improve the reliability and flexibility in operation and supply of power.