Fujian Engao Yundun Electronic Technology (福建恩高云盾电子科技有限公司) designs, builds, installs and maintains fire extinguishing equipment for oil-immersed power transformers. Its products include oil-drainage and nitrogen-injection units, integrated foam-water spray systems, water spray devices and synthetic foam extinguishing units. It is a qualified supplier to the State Grid system and has provided annual transformer fire system maintenance across nine prefectures of the Fujian grid. Its oil-immersed transformer oil-drainage and nitrogen-injection extinguishing equipment holds fire product certification 5982021ZY100046 from the Tianjin Fire Research Institute of the Ministry of Emergency Management.