This is an era of leaps and bounds. The construction and development of high-speed rail and subway have comprehensively improved the quality of China's road network, further coordinated development of regional economy, and the high-speed rail system with independent knowledge products has achieved outstanding achievements, constantly challenging various limits of technology and natural environment< Br data filtered="filtered"/> Quality creates reputation. With excellent product performance and leading position in the field of voltage regulators, our products have been accepted and widely used by customers such as China Railway, China Railway Construction, CRRC, and China Railway Bridge Bureau. They play a positive role in China's rail transit equipment