China’s economy from the early days of the founding of the People’s Republic to the present, China’s scientific and technological capabilities are increasingly entering a new era of rapid development. In view of various safety problems in coal mines in the past, the state has also increased its attention to the coal mine industry.
The design of high-voltage explosion-proof switch controllers is also constantly explored and studied in order to obtain a more secure optimal design scheme. In this paper, the author of the coal mine underground high-voltage explosion-proof switch controllers optimization. It is hoped that it will be helpful and enlightening to future coal miners. In the mining of coal mines, the degree of modern technology adopted by our country is gradually increasing. However, through the media and the network, we often hear a lot of bad news happened in the coal mine working process.
Admittedly, in the coal mining industry in full swing, there are many unsafe factors, and the high-voltage explosion-proof switch controller designed in the coal mine also has some drawbacks, which poses a certain threat to the personal safety of mining personnel, leading to the occurrence of these tragedies. Therefore, in order to ensure the lives of coal mine staff, it is necessary to improve the high-pressure explosion-proof system in the mine, and constantly optimize and improve the design of explosion-proof switch controller. From the actual situation of the mine, it is not difficult to find that there are still some deficiencies in the design of short-circuit protection of high-voltage explosion-proof switch in the mine. First of all, in the process of coal mining, the distance between transmission lines and transmission lines is too close, mostly in the tens of meters, the furthest distance is only a few hundred meters, too close there is an inevitable danger.
Secondly, the minimum current at the lower end of the line generally exceeds the current protection value of the upper one, which makes it possible for the trip of the line and makes the power supply unstable from time to time in the process of power supply. Finally, we need to point out that coal mine high-voltage lines play an important role in the transmission and distribution links.
However, coal mine managers do not pay enough attention to safety management, which makes personnel lack expertise in the use of equipment, and in the process does not lengthen the short-circuit protection distance according to the actual situation. What’s more, with their own wishes, they will not. The same cross-section cables are connected in series, which results in insufficient cross-section of the cables and the problem of long distance in the placement of the devices, all of which lead to the occurrence of short-circuit in the underground coal mine. The distance of power supply in mine is getting bigger and bigger, but the power grid is also getting bigger and bigger for ground capacitive current. Based on this, it is necessary to adjust the power supply mode in the original coal mine power supply.
Under the constant change and adjustment of operation mode, the shortcomings of traditional power supply mode are obvious compared with the current advanced mode.
We need to point out the reasons for electrical equipment and cables, long-term aging and humid environment, leading to the aging of cable insulation, switchgear used for too long, wiring boards are unavoidable to moisture, internal conductors and components have undergone deterioration of insulation materials, some even aging, these are the causes of leakage of electricity. Because. It should also be pointed out that the installation personnel in the mine will also occur leakage caused by improper construction.
In the wiring, the inadvertent connection of the line by the builder will also lead to the flourishing of leakage. When connecting equipment and cables, the loosening of the joint will be caused by the improper sealing of the joint and the loosening of the pressure plate. It will lead to leakage dangerous situation; finally, we need to pay attention to and make it clear that the management and cable suspension method should not be mistaken as supporting copper wire or iron wire suspension, which violates the safety regulations to a certain extent, and leakage will occur in a little longer time. In the actual exploration and investigation, we can see that in the normal operation of the power supply system, the design of the protection device must take into account the high sensitivity, and should also meet the requirements of Safety specifications in the mine. In order to reduce the occurrence of short-circuit problems, it is necessary to improve the current protection design scheme and adopt the current communication technology in the blocking short-circuit protection mechanism, so as to achieve the goal of effective short-circuit protection. In order to improve the design of short circuit protection mechanism, it is necessary to clarify the principle of this technology: when the next switch has been short circuit, the lock protection device will immediately send a signal to the higher level, and quickly send the short circuit signal to the whole line system, so that the short circuit protection of the first switch can be started. The blocking device can effectively avoid the occurrence of short-circuit faults. In addition, when the protection device and switch fail instantaneously, it is necessary to specify the duration of the upper locking function, which can be limited to 100 – 200 milliseconds.
Beyond this range, whether the blocking signal is eliminated or not, the protection device can be timely restored to the normal working process. The frequent occurrence of electricity leakage in underground safety problems of coal mines also poses a threat to the personal safety of underground workers.
In view of the problem of electricity leakage in underground coal mines, it is necessary to strengthen the management and maintenance of underground electrical equipment, and carry out strict experiments and checks on equipment at a fixed time, so as to ensure timely non-compliance. Replacement is carried out. Cables should be sorted out and then suspended to high places, so as to avoid the extrusion and deep burial of cables and the occurrence of dangerous situations, effectively prevent the high-pressure pipeline of emulsifying pump from friction with cables in work, thermostatic element and the electrical equipment of heading head needs to be emphatically protected, to avoid the friction between steel wire rope and cable in the collision, and to load the head-on motor. The necessary protective sheath should be installed on the wire to reduce and avoid mechanical damage. In the actual operation of mine, the sealing of electrical equipment should be reasonably protected so as to reduce the leakage time caused by dampness. In the use of grounding protection system, more attention should be paid to its reliability. Finally, it is worth noting that the connection of neutral points of underground distribution transformer in mine must not be directly grounded to avoid contact.
Electricity and leakage situation, only the underground leakage situation has been improved, in order to obtain safe and stable production in the coal mine industry. In order to optimize the design of high-voltage explosion-proof switch controller in coal mine, it is necessary to reform the protection technology of leakage and short circuit, so as to block the adverse effects of inaccurate leakage and trip protection on mining industry. In the use of advanced science and technology, the design of explosion-proof switch controller is optimized and innovated to get rid of the restrictions of the original constraints, but also to expand the scope of its use. The safety and efficiency of coal mine underground work have been greatly improved, but also for the coal mine industry to create more substantial economic benefits.