On December 25, 2008, the ±500kV DC rod pillar porcelain insulator (height 8800mm, bending resistance 16kN, creepage distance 28350mm, equal diameter deep ridge umbrella) developed for Pinggao passed the type test in the power industry power equipment and instrument quality inspection and testing center.
Tangshan High voltage Electric Porcelain Co., LTD., founded in 1952, is a subsidiary company of Beijing BBMG Group, one of China's top 500 enterprises. Tangshan High voltage electric porcelain Co., Ltd. is a power station electric porcelain product design, research and development, production manufacturers, is one of China's insulator arrester industry backbone enterprises, the annual output value of 300 million yuan, the product registered trademark "TD" brand.