Application of the Xindashida AS800 Series High-Voltage Inverter in Belt Conveyors in the Coal Mining Industry (at a Mine in Qinghai)
2025-06-06
Application of the Xindashida AS800 Series High-Voltage Inverter in Belt Conveyors in the Coal Mining Industry (at a Mine in Qinghai)
Project Background
The Xinshida variable-frequency drive permanent-magnet direct-drive system has achieved remarkable results in the belt conveyor industry, accumulating extensive practical experience and being widely used in belt conveyance systems at numerous large-scale coal mines in provinces including Inner Mongolia, Henan, Shaanxi, and Shanxi.
In this project, the Xindashida AS800 series high-voltage variable frequency drives have been successfully deployed at a mine in Qinghai, at an altitude of 3,200 meters. The mine’s belt conveyor system has now smoothly entered the trial operation phase.
Customer needs
The AS800 series high-voltage variable frequency drives face numerous challenges when used in high-altitude regions where the operating ambient temperature is below -20℃, primarily affecting heat dissipation, insulation, and electrical performance.
First, as altitude increases, atmospheric pressure gradually decreases, and the air becomes thinner, reducing the air's heat dissipation capacity. High-voltage variable frequency drives generate substantial heat during operation; if heat dissipation is inadequate, this can lead to excessive temperature rise, thereby affecting the normal operation of the equipment.
Second, the thin air at high altitudes can lead to a decline in the insulation performance of electrical equipment. As a high-voltage device, the high-voltage variable frequency drive (VFD) places particular emphasis on its insulation performance.
In addition, changes in altitude can also affect the electrical performance of high-voltage variable-frequency drives. Due to the thinner air, resistance values will change, leading to deviations in electrical parameters such as resistance and capacitance.
Xinshida Solution
Proposal Description
Implement thermal optimization measures, such as adding cooling fans and optimizing the heat dissipation structure, to enhance thermal efficiency. Correspondingly, increase the insulation clearance of the high-voltage variable frequency drive to prevent electrical breakdown. Use high-quality insulating materials to improve the equipment’s insulation performance. Make appropriate adjustments to electrical parameters to ensure the equipment operates normally.
Scheme Composition
The motor selected is a three-phase permanent magnet synchronous variable-frequency motor.
To effectively achieve load-balancing control of the motors, this project is equipped with three 1250-kW variable-frequency drives, which employ a master-slave configuration of one master and two slaves to control the belt conveyors.
The frequency converter receives the set frequency value from the operator console and sends it to the master frequency converter. The master and slave frequency converters communicate via a bus network. The No. 1 frequency converter serves as the master controller, coordinating the synchronous operation of the No. 2 and No. 3 slave speed-regulating systems.
Associated products
AS800 High-Voltage Frequency Converter
Project Results
The application of this frequency converter has not only boosted the mine’s production efficiency but also significantly reduced energy consumption, bringing dual benefits—economic and environmental—to the mining enterprise.
In such a high-altitude environment, the stability and reliability of the equipment have been thoroughly validated, marking a further expansion of this series of inverters’ applicability in extreme environments.
