Song Lin, a staff member of the power science research institute of the state grid corporation of qinghai province, adjusts equipment in the high-voltage experimental hall on May 9.

On the same day, the power science research institute of qinghai electric power company of state grid carried out the air net distance test of 800 kv high voltage valve hall under high altitude and high dry environment in the high altitude and high voltage laboratory high voltage hall in xining city.This study provides technical support for the smooth implementation of the qinghai-henan 800 kv HVDC project, and is of great significance for the research on ultra-high voltage and ultra-high voltage transmission and transformation equipment in China's high-altitude areas.