Oil-type transformers are crucial in power supply and distribution systems for industrial and mining enterprises and civil buildings. They reduce network voltage to 230/400V bus voltage and are suitable for AC 50 Hz, three-phase transformers with a maximum capacity of 2500kVA. These transformers can be used indoors or outdoors with a capacity of 315kVA or below. The transformer should be installed on a pole, with ambient temperatures below 40℃, daily average temperatures below 30℃, annual average temperatures below 20℃, relative humidity below 90%, and the transformer's altitude below 1000m. If inconsistent with these conditions, quota adjustments should be made according to GB6450-86 provisions.