1. brief introduction In the electric power system, large capacity transformer is mainly oil immersed power transformer, its stable operation is important to ensure the safe operation of the power system. At present, the nitrogen-injection transformer fire extinguishing device with its exclusive feature of prevention first and combination of fire prevention and fire fighting, has become an important fire control facility for oil immersed power transformer. 2. work conditions Detector, block valve, fire prevention cabinet can be installed outdoor while control panel should be installed indoor. Installation site should be free from violent vibration, impact and corrosive gas Ambient temperature a) Outdoor equipment: -40℃～60℃ b) Indoor equipment: 5℃～30℃ Relative humidity a) outdoor equipment: ≤95(at 20℃±5℃) b) Indoor equipment: ≤85(at 20℃±5℃) Power: DC220V or DC110V Working scheme Ordering instructions When placing the order, please inform us the layout plan, transformer manufacture contact information, and design institute contact information If users have special requirements, please put forward with orders