Tianjin Cable Plant Rubber Cable Factory – In mine power supply systems, high-voltage power lines typically use armored cables, which have a much lower failure rate compared to low-voltage rubber cables. Power supply in mining areas is often a weak point in the overall system, and the working environment is usually harsh. Therefore, choosing the right type and cross-sectional area of the cable is crucial for ensuring safe and reliable power operation. This article discusses the methods for selecting appropriate cables and their cross-sections.
**First, Choosing the Right Cable Model**
The selection of the cable model significantly affects the reliability, safety, and cost-effectiveness of the power supply. According to Article 467 of the Coal Mine Safety Regulations, the following requirements must be followed when selecting cables:
1. The vertical difference of the actual installation location should match the cable's specified installation level.
2. Cables must have conductors with sufficient cross-section for protective earthing.
3. Aluminum cables are strictly prohibited.
4. Fire-retardant cables that have passed inspection and obtained coal mine safety certification must be used.
5. The main core section of the cable must meet the load requirements of the power line.
6. For fixed high-voltage cables:
- In shafts or inclined tunnels over 45°, PVC-insulated heavy steel wire armored cables or cross-linked polyethylene insulated thick steel wire armored cables should be used.
- In horizontal tunnels or those with inclinations less than 45°, PVC-insulated steel tape or fine steel wire armored cables are recommended.
- Aluminum core cables may be used between inclined shafts, underground depots, and central substations, but copper core cables must be used elsewhere.
- Fixed low-voltage cables should be M-type or non-armored cables, or mobile rubber-sheathed cables of the corresponding voltage class.
- Non-fixed high- and low-voltage cables must use rubber-sheathed flexible cables meeting Mr818 standards. Mobile and handheld equipment should use dedicated rubber-sheathed cables.
- Cables for lighting, communication, signaling, and control should use armored telecommunication cables, rubber-sheathed cables, or plastic cables of the appropriate type.
- Aluminum cores are not allowed for low-voltage cables, especially in mining areas.
**Second, Selecting the Cable Cross-Section**
Cable cross-section selection involves both high- and low-voltage cables, with low-voltage cables being the primary focus. When selecting the main core size for low-voltage power lines, especially in long mining area circuits, it’s essential to consider the following four key principles:
1. The temperature rise during normal operation should not exceed the maximum allowable temperature for the insulation material.
2. The permissible voltage drop across the cable line must be considered.
3. The cross-section must meet mechanical strength requirements.
4. Proper current carrying capacity should be ensured to avoid overheating and potential damage.
Mine cables refer to the various types of cables used in coal mining operations, including those for mining, transportation, communication, lighting, signaling, and power distribution. These include electric drill cables, cap lamp wires, downhole mobile substations, and other specialized power cables. Choosing the correct type and size of these cables is essential for maintaining safe and efficient operations in challenging underground environments.
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