Dry transformer

Mingtong series SC(B) 9, SC(B) 10, SC(B) 11, SCZ(B) 9, SCZ(B) 10 and SCZ(B) 11 of epoxy resin casting dry transformer (6-35kV, 30-6300kVA) are environment-friendly and energy-saving products. They are optimized and developed by using our unique process and fixtures independently on the basis of Germany software. It features low loss, noise and partial discharging and reaches the international level at all aspects. Company has been identified with ISO9001, ISO14001 and PCCC so that we are capable for controlling design, development, production, installation and service effectively. 1,Excellent environment performance. Hi/lo-voltage windings are polished and formed by vacuum casting. It can run infallibly and normally under severe conditions such as polluted air and 100% RH. It can be activated without preheating after shutdown. 2,Good insulation. Cast the epoxy resin that boasts an insulating breakthrough field intensity of 22 to 26kV/mm and offers strong insulation capacity when current flows through it. The insulation temperature is of grade F and permits the maximum value of 155°C. The temperature rise of windings does not exceed 100K. 3,Better short-circuit resistance. The better mechanical strength is attributed to properties of resin and complete casting and thermal curing process of windings. 4,Outstanding disaster protection. Epoxy resin is difficult to ignite and can retard combustion and extinguish by its own. Because it is impossible to cause consequential hazards such as fire and explosion, it can be installed around the load center and close to consumers, which reduces the construction cost and expensive low-voltage facilities. 5,Zero maintenance. Comprehensive accessories of temperature control and indication can guarantee the safe operation reliably and so alleviate the workload of operators as well as lower the running expense considerably. 6,Low loss, noise and partial discharging, small volume and light weight facilitate installation and commissioning. 7,High reliability. The study on feedback for currently running transformers demonstrates that our products are comparable to internationally advanced ones. Capacity range: 30-6300kVA Voltage level: 6-35kV Voltage regulation: non-exciting or on-load Shunting scope: ±5%, ±2×2.5%, +3(-1)×2.5% or others upon the request of customers Frequency: 50Hz Number of phase: three-phase or single phase Coupling group: Yyn0, Dyn11 or others upon the request of customers Short-circuit impedance: GB or others upon the request of customers Relative humidity: ≤100% Ambient temperature: ≤40°C or others upon the request of customers Maximum temperature rise: 100K Cooling method: AN or AF Thermal grade: F Protection grade: IP00, IP20 and IP23 Insulation: power frequency withstand voltage of 35kV and surge withstand voltage of 75kV for transformer at the level of 10kV power frequency withstand voltage of 50kV and surge withstand voltage of 125kV for transformer at the level of 20kV power frequency withstand voltage of 70kV and surge withstand voltage of 170kV for transformer at the level of 35kV Symbols of types S Three-phase C Epoxy resin casting (Z) On-load voltage regulation (B) Low-voltage foil windings 9Performance code: 9, 10 and 11 -(RL)- Cubic winding iron core Rated capacity of high voltage(kV) Rated value of high voltage (kV) Products boasts so many benefits such as strong capacity against thermal impact, excellent overload capacity, difficulty of ignition, flame proof, low loss and insensitivity to humidity and dust that the scope of application is wide. They are most suitable for severe environment that is exposed to big fire hazards, great load fluctuation and dirty yet wet places, including but not limited to airports, subways, power plants, metallurgy sector, hospitals, high-rise, shopping mall, dense residential community, petrochemical sector, nuclear power plants, nukes and other important areas. Therefore they are the most ideal power supply and distribution equipments.