The Xinshida AS800 series high-voltage frequency converter has been successfully applied in a mine in Qinghai at an altitude of 3,200 meters, and its belt conveyor system has now successfully entered the trial operation stage.
The application of this frequency converter not only improved the production efficiency of the mine but also significantly reduced energy consumption, bringing both economic and environmental benefits to the mining company. The stability and reliability of the equipment were fully verified in such a high-altitude environment, marking a further expansion of the frequency converter series' application capabilities in extreme environments.
Challenges of operating frequency converters at high altitudes
The AS800 series high-voltage frequency converter faces many challenges in high-altitude areas where the operating environment temperature is below -20℃, mainly including the impact on heat dissipation, insulation and electrical performance.
First, as altitude increases, atmospheric pressure gradually decreases, and the air becomes thinner, leading to a reduction in heat dissipation capacity. High-voltage frequency converters generate a significant amount of heat during operation; poor heat dissipation can cause excessive temperature rise, affecting the normal operation of the equipment. Therefore, when using high-voltage frequency converters in high-altitude areas, heat dissipation optimization measures are necessary, such as adding cooling fans and optimizing the heat dissipation structure, to improve heat dissipation efficiency.
Secondly, the thin air at high altitudes leads to a decrease in the insulation performance of electrical equipment. As a high-voltage device, the insulation performance of high-voltage frequency converters is particularly important. In high-altitude areas, due to the reduced air insulation strength, the insulation distance of high-voltage frequency converters needs to be increased accordingly to prevent electrical breakdown. At the same time, high-quality insulation materials are also required to improve the equipment's insulation performance.
Furthermore, changes in altitude can also affect the electrical performance of high-voltage frequency converters. Due to the thin air, resistance values change, causing deviations in electrical parameters such as resistance and capacitance. Therefore, when using high-voltage frequency converters in high-altitude areas, it is necessary to adjust the electrical parameters appropriately to ensure the normal operation of the equipment.
Product Parameters
The motor is a three-phase permanent magnet synchronous variable frequency motor.
To effectively achieve load balance control of the motor, the project is equipped with three 1250kW frequency converters, using a 1 master and 2 slave configuration to control the belt conveyor.
The frequency converter sends the given frequency value to the main frequency converter from the control panel. The main and slave frequency converters communicate via bus. Frequency converter #1 acts as the master controller, controlling the synchronous operation of slave frequency conversion speed regulation systems #2 and #3.
Application Site
The Siasun frequency converter permanent magnet direct drive system has achieved fruitful results in the belt conveyor industry, accumulating rich practical experience. It has been widely applied in belt conveyor systems of numerous large coal mines in Inner Mongolia, Henan, Shaanxi, Shanxi, and other provinces. These application cases fully demonstrate the significant advantages of the Siasun frequency converter permanent magnet direct drive system in improving operating efficiency, reducing energy consumption, and minimizing maintenance costs.
