What is the biggest feature of underground coal mine power supply? Used in high gas mines.

1. Problems existing in the current power supply and consumption management work

1. Single line and main transformer operate in single column, resulting in poor power supply reliability.

At present, both power supplies in some coal mines come from the same regional substation. The 35KV substation in the mine operates in single train for lines and main transformers. In this way, whether it is the superior substation, the power supply line or the main transformer, any failure will cause the entire mine's power supply to be interrupted. For mines with high gas outbursts, the consequences of a mine-wide power outage are very serious, because this is extremely It is easy to cause gas over-limit accidents in some working surfaces, thus endangering the safety of miners and mines.

2. High-power and high-voltage motors are started directly, which has a greater impact on the power supply system and endangers the safety of the power supply.

The use of high-power high-voltage motors has irreplaceable advantages in reducing transformer line losses, improving system efficiency, and reducing equipment investment. However, we should also see that direct starting of high-power and high-voltage motors has a greater impact on the power supply network. The instantaneous starting current is high and the voltage drop of the power grid is large, causing some electronic components and equipment and microcomputer protection devices that require high power supply quality to malfunction. Movement, failure to work or even damage may endanger the normal production safety of the mine.

3. Uncoordinated cooperation between different protection devices, untimely update of settings, unreasonable settings or unreasonable investment in protection can easily lead to power outage accidents.

4. Some coal mines' harmonic control and capacitance compensation devices have not been installed or effectively put into operation, making it difficult to guarantee the quality of power supply.

5. The electricity management system failed to be established in time and gradually improved.

6. The technical level of employees varies, and business skills need to be improved urgently.

It is a common phenomenon that the cultural quality of coal mine workers is poor. Even a small number of college graduates will need a long period of practice before they can adapt to relevant work. Faced with the current advanced technology and automation level, With high-quality electrical equipment, how to improve their business skills, enable them to use and operate electrical equipment correctly, ensure the quality of maintenance, and prevent electrical accidents that should not occur due to technical capabilities are all urgent problems that need to be solved.

7. Preparatory plans for power supply and consumption accidents must be continuously improved in a timely manner and drilled regularly.

It is impossible for any coal mine to ensure safe power supply forever. In order to prevent possible power outage accidents, a series of accident emergency plans should be formulated based on the actual situation of the mine, starting from the mine 35KV substation. Detailed emergency plans must be formulated at substations in underground mining areas to restore power supply in the shortest possible time and ensure normal production. 2. Problem Discussion

In view of the above-mentioned problems in power supply management, combined with the actual situation of high gas mines, I believe that the following work should be done:

1. In terms of operation mode: (1) Actively negotiate with relevant departments to strive for double-circuit split operation; (2) If it is a single-train operation, regular inspection of the lines and main transformers as well as the importance of loads such as fan rooms in the mine The workshop performs double-circuit switching to ensure that the backup line is in good condition; (3) In single train operation, in order to reduce the scope of accidents, except for the 6KV bus coupling operation in the 35KV substation, the other substations at all levels The bus connection should be in the open state. Under special circumstances, it can be closed and operated only with the approval of the relevant leaders.

2. In terms of protection coordination: (1) Unify the types of protection devices to ensure coordination among protection devices; (2) Unify the calculation and setting of protection settings according to the actual load conditions; (3) Make reasonable investment according to the protection objects of the protection devices Various protections ensure the safe and efficient operation of electrical equipment; (4) In order to conduct real-time monitoring and control of the changes in the load above and below the well, the adjustment of protection settings, and the operation of the equipment, it is necessary to promptly detect and take action when equipment fails. 9 7 3 1 2 4 8: Source: China Safety World Network

In order to deal with emergencies, prevent the expansion of the accident, and reduce the impact time of the accident, a set of upper and lower power monitoring and control systems should be installed in the ground monitoring center to ensure the safety of electrical equipment. Run efficiently.

3. In terms of operation management: (1) Establish and improve various power management regulations and systems to discuss the safe power supply and use of high gassy coal mines

Author: Anonymous Safety Collection Source: Unknown Number of clicks: 456 Update time: 2008-6-7

Provide the basis for safe power supply and consumption; (2) increase the intensity of electrical quality standardization and lay a solid foundation for safety; (3) strengthen electrical inspection and supervision Implement various management regulations; (4) Strengthen inspection and maintenance of power supply and consumption equipment to ensure the safety of power supply.

4. Develop detailed emergency plans and strengthen drills to prevent accidents.

Based on the actual power supply and consumption conditions of the coal mine, prepare a thorough and detailed emergency plan, accident report and handling procedures, organize relevant personnel and substation workers to conduct on-site drills, and effectively improve the emergency response capabilities of substation workers; at the same time, use the shift I will often study some cases of power supply and consumption accidents before and after my shift to improve my business knowledge and skills.

5. Increase business skills training and improve employee quality.