This paper introduces the application of INVT GD5000 series medium-voltage four-quadrant vector VFD in the inclined shaft hoist of GUANG HANH coal mine plant in Vietnam, analyzes the control strategy after the transformation and describes the effect of frequency conversion transformation.
In the project, two BPJ1 inverters drive two asynchronous motors to keep the power balance in one control system. After replaced the star-delta system to inverter, the working efficiency of conveyor belt becomes higher, and start smoothly.
The adoption of medium voltage inverter on belt conveyor is the main point of safer and more reliable usage for mine belts. Based on the application comparison of hydraulic couplers and inverters on belt conveyors, and combined with the site working of belt conveyors and inverters in Vietnam coal mine, the article introduces relevant technology of belt conveyor systems and the application of medium voltage inverters on the system.
This article analyzes operating characteristics of mine hoist, controlling difficulty and special requirement to inverter, introduce Goodrive300-19 series special inverter for crane, and advantage of Goodrive300-19 applied to mine hoist.
the annual output of coal of a coal company of Shanxi Jincheng Anthracite Coal Mining Group is 600,000 tons, the belt conveyor in the coal outlet is driven by two sets 6kV / 710kW asynchronous motors. The enterprise originally adopts soft starters and hydraulic couplers to solve the problem of motor start and speed control, but there are still a lot of drawbacks. Soft starter will produce a large number of harmonics, hydraulic coupling has high failure rate with large maintenance works, and multi-motor drive is difficult to adopt liquid coupling to solve the power balance problem between two motors.
The FBDCZ in the mine ventilation opening of a coal mine of Shanxi Meijing Group is driven by two 10kV / 900kW asynchronous motors, the fan adopts industrial frequency constant speed drive, the air volume and negative pressure control is mainly achieved by adjusting the baffle position or fan angle, not only the energy waste is serious, and manually adjust the baffle or fan angle need to stop the machine, and remove the screws, which wastes time and effort and affects the production, and it’s easy to produce security risks once the screws are not tightened.
The underground drain pump in a mine factory of Guizhou Zijin Group is driven by a 10kV / 630kW motor, the capacity is mainly supplied by the on-site generator, the company uses the stator string reactor start mode, but still cannot fully meet the requirements. In addition, the scene needs to start and stop the motor according to the water level change, all day need someone on duty with large labor intensity.
In order to increase the daily processing capacity of ore, a tungsten plant in Ninghua Fujian has introduced a roller pressure system; the dynamic and fixed roller of roller press is respectively driven by two sets 10kV/630kW motors. At present, almost all the roller presses are constant frequency speed control, which results in the unadjustable output, and the over-current phenomenon caused by the imbalance of dynamic and fixed roller motor power.