Yoanpower is the international trade brand and export subsidiary of Wuhan Defu Electric Co., Ltd., a high-tech enterprise founded in 1983, specializing in the R&D and manufacturing of high voltage test transformers and electrical test equipment.
For four decades Defu Electric has served power generation, transmission and distribution utilities, research institutes and electrical equipment manufacturers with advanced HV testing instruments. Recognized as a technology enterprise by the Wuhan Municipal Science & Technology Commission, we maintain long-term cooperation with Wuhan University of Science and Technology, Huazhong University of Science and Technology (HUST) and the Wuhan High Voltage Research Institute, with professors supervising production throughout the process.
In 2001, the National Development and Reform Commission (NDRC) and the Wuhan High Voltage Research Institute appointed us as a drafting member of China's power industry standards — the only manufacturing enterprise in Wuhan to hold this role. We participated in drafting DL/T 848.2-2004 (Power-frequency HV test devices), DL/T 848.3-2004 (Partial-discharge-free test transformers) and DL/T 848.4-2004 (Three-frequency test transformer devices), and multiple products have won national, provincial and municipal awards.
Our equipment is trusted by Siemens (China), Baosteel, Wuhan Iron & Steel (WISCO), BYD, China Chemical Engineering, and leading power construction companies across China. Through Yoanpower, the same factory-grade quality now reaches utilities and EPC contractors in the USA, India, Nigeria, Southeast Asia and 60+ countries worldwide.