SANDIAN located in Liling City, Hunan Province of China, is the leader manufacturer of high-voltage Instrument Transformers and Porcelain Insulators industry in China. The main factory is Hunan Electric Power Insulator and Apparatus Co., Ltd. The company boasts a robust background in high-voltage transformer technology research and development, as well as production management. SANDIAN primarily manufactures 35~500kV high-voltage instrument transformers and focuses on the production of export-type instrument transformers with leading technology and strong competitiveness. Products are exported to over 50 countries worldwide.

SANDIAN manufacturing facilities and testing equipment have achieved the top level of the domestic industry. The factory  has two fully enclosed high-purification clean workshops. The key process of vacuum oil filling is fully automatic control. The factory has 3 sets of vacuum drying treatment systems and 2 complete insulating oil treatment devices. It builds 2 fully enclosed high-voltage lab and is equipped with power frequency test equipment of 550kV and 1500kV without partial discharge and 3000kV impulse voltage test device.

SANDIAN  has a perfect quality control system and implements comprehensive quality management procedures, so that our products is in the conformity of ISO9001 standard. The factory has consummated certificate of ISO9001 quality management systems, ISO14001 environmental management systems, and OHSAS18001 occupational health and safety management systems. The engineering technicians have abundant designing experience, and the workers and debugging personnel own exquisite technologies. They have provided equipment of excellent performance, wide varieties and credible quality to customers from around the world.

SANDIAN  adheres to the "every product is a high-quality product, and we serve every customer in good faith" business philosophy, and aims to become a respected and trusted partner in the power transmission and distribution industry. We sincerely welcome friends from domestic and abroad to visit our company and look forward to collaborating closely for mutual benefit and common development, creating a brilliant future together!