1.background
In the process of coal mining, the distance between coal mining, driving equipment and power supply equipment is increasing, and there are a series of long distance power supply problems. Seriously affect the safety and efficiency of coal mining, at the same time, long-distance power transmission makes the mine distribution line loss, greatly increase the use of power and loss, to the relevant coal mining enterprises have brought great economic losses.
In order to reduce the economic losses of coal mine enterprises, strengthen the safety of underground coal mine electricity, and achieve the purpose of fully saving energy and reducing consumption, FGI proposed a comprehensive treatment plan for long-distance underground coal mine power supply.
2.Problems of power supply in underground mining of coal mine
Long distance power supply problem of fully mechanized mining and driving face.
Long distance power supply system problem of underground high and low voltage transmission line.
3.FGI coal mine underground long distance power supply comprehensive treatment program
The FGI comprehensive treatment plan includes power network comprehensive regulation device, reactive power compensation device and frequency conversion device for the terminal equipment of the mining face, which is used to solve the problems of low end current pressure, low power factor, difficulty in starting large load equipment and serious harmonic pollution in the low-voltage distribution line of the fully-mechanized mining face and the driving face. At the same time, the large-capacity reactive power compensation device is configured in the substation to improve the voltage stability of the system, reduce the loss of lines and transformers, eliminate harmonic pollution, and extend the service life of power supply equipment and transmission cables.
4.Application effect of FGI coal mine underground long distance power supply comprehensive treatment scheme
Improve the power factor of the power grid, improve the utilization rate of the power supply system, save energy and reduce consumption;
Stabilize the power grid voltage. After compensation, the reactive power is reduced, and the relative change amplitude of voltage and current in the system is small, which can start the role of stabilizing the power grid voltage.
Effectively extend the working distance of coal mine underground driving face and fully mechanized mining face. Extend power supply distance, reduce work intensity, improve work efficiency;
Effectively reduce the line voltage loss of the underground high-voltage distribution line, and solve the problem that the end load equipment is difficult to start and the motor is damaged.
5.Application cases
(1) A coal mine in Inner Mongolia
The WJL1-2100/3.3 explosion-proof Static Var Generator equipment of FGI Company was successfully applied in the coal face of a coal mine in Inner Mongolia, which effectively solved the problem of starting the coal mining unit at the end of the long distance power supply line of 3.3kV fully mechanized coal face. A 3.3kV2.1M explosion-proof Static Var Generator is configured to place the shearer power supply branch, and the shearer can be started directly and stably 3000 meters away from the mobile substation, thus meeting the shearer's distance power supply demand.
(2) A coal mine of Yankuang Energy Group
FGI BPBJV1-1400/10/3.3 explosion-proof frequency converter has been successfully put into operation on the fully mechanized mining face of a coal mine of Yankuang Energy Group. The master and slave control mode is adopted to realize the automatic adjustment of the power balance of the master and slave, and the system runs reliably. Equipped with two 3.3kV1400kW explosion-proof high voltage frequency converters, to realize the explosion-proof high voltage frequency converter equipment to the scraper 3500 meters long distance power supply application.