1.introductory

Downhole drainage pump is a kind of pump that discharges water from the well to the upper pool, reverse seepage wall well or wellhead. Downhole drainage pump is mainly composed of motor, pipeline, pump body and auxiliary equipment.

The working principle of the downhole drainage pump is to introduce water into the center of the pump impeller through the inlet pipeline, and under the influence of pump rotation and centrifugal force, the water is compressed and sent to the drain. The water is pumped into the pipe and then drained out through a drain. Mine drainage pump is an effective way to realize mine drainage and is an important guarantee for normal production of the mine.

2.Problems with mine drainage pumps in use

（1）When the motor is fully depressed and the drain pump starts directly, because the starting torque of the motor has to draw 7 times the rated current of the motor from the grid, and the excessive starting current will not only cause a waste of electrical energy, but also cause great damage to the voltage fluctuation of the grid, and will also cause the line loss to increase.

（2）Excessive starting torque will cause mechanical shock, which will bring great impact to the equipment, and will also cause abnormal wear and impact on the mechanical transmission parts, thus reducing the service life, and therefore the maintenance workload will also increase.

（3）Motor hard start will not only bring great shock to the power grid, but also increase the capacity of the power grid.

（4）If the diesel generator is started for emergency power supply, the drainage pump can not be started directly at industrial frequency.

3.FGI High Voltage Explosion Proof Inverter Solutions

FGI high-voltage explosion-proof frequency converter integrates the mobile substation and frequency converter together, featuring small volume; the phase-shifting transformer is a delayed delta structure, which can shift the input voltage of the components and reduce the impact of harmonics on the power grid; the complete control system based on the DSP chip reduces the generation of harmonics through the technology of unit series connection and carrier phase-shifting, as well as the high-speed optical fiber communication, which can drive devices such as scrapers, belt conveyors, pumps, etc. under the long distance of more than 5,000 meters. Above the long distance, drive devices such as scraper, transfer machine, belt conveyor, pumping pump and so on.

4.High-voltage explosion-proof frequency inverter product features

The structural design of the product breaks the technical boundaries and has significant capacity advantages.

Power unit cascade carrier phase shift technology, no harmonic interference, can be driven from a distance.

Adopt various control methods, induction motor, synchronous motor, free drive.

Integrated monitoring, alarm, positioning, more complete protection.

With unit bypass, insulation detection and other functions, make the work more safe and reliable.

5.Performance

Safe power supply to the mine is an important prerequisite for the safety of coal mine production, as long as the power supply to the mine is safe, then other safety measures can be better guaranteed. In special emergency power supply situation, must ensure that the mine power supply is reliable, safe, reliable power supply, that is, there should be uninterrupted power supply. For diesel generators in the emergency power supply, can not meet the problem of large-capacity primary load start, the use of FGI high-voltage explosion-proof frequency converter to solve the problem of emergency motor start, FGI high-voltage frequency converter in the mine under the soft start of the drainage pump switching, and get a very good application, and at the same time, the coal mine's intelligence also needs the participation of high-voltage frequency converters, energy saving and emission reduction through the frequency converter for the carbon reach the peak, carbon neutralization To make a contribution, I think the high-voltage explosion-proof frequency converter will certainly get more development and application.