Zhengzhou Tongyu Technology Co., Ltd. 

Zhengzhou Tongyu Technology Co., Ltd. was established in 2011 and is located in Xin Zheng, Henan Province. It occupies an area of 8,000 square meters and has a team of over 70 people. The company specializes in the research, development, and production of current and voltage transformers for various models up to 35kV. With over 15 years of industry experience, the company focuses on precise measurement, safety, and stability, providing high-quality transformer products and customized solutions for the power system, new energy, and industrial automation sectors.
1. Core strengths: Over 15 years of expertise focused on the transformer sector, with a diverse range of products covering voltage levels of 35KV/20KV/10KV/6KV/3.3kV/0.66KV, catering to various metering, protection, and monitoring needs. A variety of indoor and outdoor current, voltage, zero-sequence, and composite transformer products. Annual production capacity of 100,000 units, serving over 150 power companies nationwide, 5,000+ renewable energy projects, and 3,000+ substation projects.
2. Technical capabilities: We have advanced fully vacuum static epoxy casting equipment, intelligent ovens, automatic winding machines, and other complete production equipment. We have comprehensive testing equipment for errors, excitation characteristics, voltage-current characteristics, DC resistance, AC withstand voltage, frequency-multiplied partial discharge testing, and other parameters, which form an independent and precise testing laboratory. We strictly adhere to GB/T 20840 and IEC 61869, using international and domestic standards as well as the standards of the Southern Grid of the State Grid Corporation. We possess our own core technologies for product development and have a top-notch research and development team with numerous patents.
3. Quality Assurance: All products manufactured by the company have been approved and certified by the national authority for manufacturing measurement instruments. The company has obtained certifications for its management systems, including ISO 9001 quality management system and ISO 14001 environmental management system. The entire production process is rigorously tested and inspected. The use of the Kingdee Cloud Star system software enables comprehensive management throughout the process. Traceability ensures product quality, with measurement precision reaching the 0.2S level and protection factors being met. The products comply with the requirements of the National Grid standard, the South Grid standard, national standards, and international standards, thereby providing assurance for the stable operation of the products on site.
4. Product lineup: The flagship product is the voltage/current transformer. It is suitable for use in national grid, southern grid, substations, switchgear cabinets, ring network cabinets, new energy photovoltaic power stations, wind farms, industrial power usage, steel and chemical industries, and rail transit high-voltage distribution scenarios. It features high insulation and low loss characteristics, current and voltage monitoring, and protection circuits, which are widely used in distribution systems.
5. Service: Our well-equipped after-sales service team can quickly respond to and resolve various issues encountered during on-site operation. We support custom-made drawings, special customization of ratio and precision parameters, and meet customers’ diverse requirements for various parameters.
We have established long-term cooperative relationships with major switchgear manufacturers, including power grid companies, Xuji Electric Co., Ltd., Henan Pinggao General Electric Co., Ltd., Tianjin Pinggao Intelligent Electric Co., Ltd., Henan Penggao Xianghe Electric Co., Ltd., Beijing Hezong Technology Co., Ltd., Beijing Kerui Distribution Automation Co., Ltd., Xuchang Intelligent Relay Co., Ltd., and Henan Senyuan Electric Co., Ltd.
The company’s mission is to “accurately transmit electrical signals and safeguard electrical safety.” It strives to become a leading provider of specialized, intelligent, high-quality transformers in the field of current transformers, offering customers even better products and services. The company serves the global power industry.