Transformer manufacturers tell you what are the adverse effects of high transformer temperature

For ease of calculation, it can be assumed that the output air velocity is close to the average value. According to the technical parameters of the cooler fan, the calculation results show that the scaling of the powerful oil-air-cooled transformer cooling system on its cooling capacity and maintenance of the impact of the air volume. s is the labeled area, t indicates the time. Model full pressure / PA voltage / V impeller diameter rotation speed / (Rmin current / a air volume / (m) power / kW noise / DB2) on-site measurement of the cooler after washing the cooler fins of the cooler's exit wind speed, with ta-Si640 anemometer continuous measurement of the cooler's exit end of the wind speed for 1 minute, compare the transformer's cooler with respect to the theoretical calculations of the exit wind speed than the results of measurements carried out, the output of the wind speed of 10.21, from the numerical and measured values to detect the cleaned cooler. The measured value of the outlet wind speed is consistent with the theoretical calculated value.

The results show that the cooling effect of the cooling system is significantly improved under the same operating conditions./span>

The daily inspection sites are located at higher elevations where the air is thin and the transformers use air immersed in cold and oil, leaving them immersed in self-cooling with reduced cooling. The limit of temperature rise of the transformer is calculated mainly based on the life of the transformer.

For every 6K rise, the life of the transformer insulation is halved. Oil-immersed transformers are generally made of class A insulation. The temperature is 105℃ and the life temperature is 98℃. It can guarantee 20 years service life of a grade insulation material. According to iec76-2 standard, when the altitude is above 1000 meters, the temperature rise limit of oil from cooling transformer decreases by 2%, and the temperature rise limit of oil infiltration air-cooled transformer decreases by 3%.