Founded in 1984, it is a well-known brand in the electrical industry, a listed company, and a high-tech enterprise specializing in the R&D, manufacturing, sales and service of transformer on-load tap-changers and non-excitation tap-changers

Guizhou Changzheng Electric Co., Ltd., formerly known as Changzheng Electric No. 1 Factory, is a subsidiary of Guizhou Changzheng Tiancheng Holding Co., Ltd., which is a high-tech enterprise specializing in the R&D, manufacturing, sales and service of transformer on-load tap-changers and non-excitation tap-changers.

The company began to independently develop tap-changers for transformers in the early seventies of the last century, and introduced a full set of tap-changer manufacturing technology from abroad in 1984, and developed ZVMD, ZVM, ZVV, ZMD, ZMT, ZMB, ZM, ZV series tap-changers with independent intellectual property rights through digestion, absorption and innovation, and the products reached the international advanced level, and won the title of national and provincial famous brand products. A number of products have won national and provincial scientific and technological progress awards, new product awards and scientific and technological achievement awards, and have been rated as national excellent products.

The company's products are widely used in electric power, petroleum, chemical, metallurgy, railway, light industry and real estate industries, and exported to more than 30 countries and regions. The company has won unanimous praise from new and old customers for its excellent product quality and high-quality service.

The company has passed the quality management system certification, environmental management system certification and occupational health and safety management system certification of China Quality Certification Center.

The new Long March Industrial Park, which the company invested 350 million yuan, has been put into use, and has now built the largest tap-changer production base in China.

The company will uphold the tenet of "safety comes from quality, rest assured comes from service", continues to adhere to the rigorous spirit of scientific and technological innovation, continuously improves product quality, pursues excellent quality, and strives to build the "Long March" brand into a first-class brand in China.