The State Grid Corporation of China UHV DC Test Base is located in the East District of Changping Park, Zhongguancun Science and Technology Park, Beijing. After completion, the base achieved 13 world firsts, laying a solid foundation for the State Grid Corporation to occupy the commanding heights in the global power technology field and obtain world-class scientific and technological achievements. The line towers and corona cage steel structures of the base were all constructed by our company, among which the two largest portal towers are 88 meters high, 80 meters wide, and weigh 590 tons each. Our company completed the delivery of all towers in just 28 days from receiving the drawings in April 2007, creating a miracle in the tower manufacturing industry.