The high-altitude oil-immersed transformer series (S11, S13, S15, S20) and high-altitude dry-type transformer series (SCB10, SCB11, SCB15) are designed for altitudes less than 1000m. However, high-altitude models are specifically designed for higher altitudes, which are definitely above 1000m. The specific differences in design parameters are as follows: temperature rise and voltage withstand correction based on altitude involve strengthening external insulation (high and low voltage bushing outlet ends) and reducing temperature rise.
When the altitude of a plateau-type transformer reaches above 1000 meters, the thin air on the plateau results in poor heat dissipation for the transformer. Therefore, increasing the distance between the bushings of a plateau-type transformer is to facilitate heat dissipation, so as to prevent components such as the transformer from accelerated wear due to high temperature, which would reduce its service life. The altitude requirement for ordinary transformers is less than 1000 meters. Plateau-type transformers should be used at higher altitudes, and Sichuan plateau-type transformers are used at altitudes greater than 1000 meters.
Service conditions: The service conditions that meet the following requirements are considered normal service conditions:
a. The altitude is not more than 5000m.
b. Ambient temperature
*Temperature +40℃
*Daily average temperature +30℃
*Annual average temperature +20℃
*Temperature -40℃ (applicable to outdoor transformers)
*Temperature -10℃ (applicable to indoor transformers)
c. Waveform of power supply voltage
The waveform of the power supply voltage resembles a sine wave.
d. Symmetry of multiphase power supply voltage
The power supply voltage connected to the multiphase transformer should be approximately symmetrical.
The air is thin on the plateau, which leads to poor heat dissipation for electrical components. Therefore, increasing the distance between bushings facilitates heat dissipation, preventing components such as transformers from experiencing accelerated wear due to high temperatures, thereby extending their service life. We have effectively addressed both heat dissipation and low temperature issues.