The ability to provide a continuous and stable power supply to underground systems is a critical factor for the entire mine’s production and even personnel safety. Due to the enclosed, humid, dusty, and confined underground environment, coupled with dense equipment and heavy mechanical loads, a power outage can not only cause a complete production shutdown but also lead to serious safety hazards such as ventilation system shutdown, hoisting equipment malfunction, and monitoring system interruption. Therefore, ensuring a long-term reliable power supply to underground systems has become an important part of the systematic planning for mining enterprises. Achieving stable power supply does not rely on a single device but requires a comprehensive approach encompassing equipment selection, line design, backup systems, monitoring management, and daily maintenance to form a sustainable power supply system operating in a closed environment.
To ensure continuous power supply underground, we must start from the source of the power supply system. The surface main substation and underground substation are the core of the entire system. They require highly reliable electrical equipment, such as high-voltage switchgear with overload and short-circuit protection functions, explosion-proof electrical equipment, and moisture-resistant and corrosion-resistant transformers. Furthermore, the main power supply line must be designed with dual circuits, ensuring automatic switching to the other circuit in case of a fault in one circuit, preventing a complete power outage due to a single circuit failure. Given the numerous underground working areas and long lines, flame-retardant, pressure-resistant, and moisture-resistant mining cables must be selected and installed according to specifications to prevent mechanical compression, excessive bending, or prolonged water immersion that could cause failures.
A stable and reliable backup power supply is indispensable for continuous power supply to underground systems. Many mining companies install UPS (Uninterruptible Power Supply) systems underground to handle power demands during momentary power outages, switching delays, or sudden grid failures, ensuring that critical systems such as ventilation and monitoring are not affected for short periods. In some critical areas, explosion-proof diesel generators are even equipped as backup power sources to ensure the continued operation of basic production and safety systems even under prolonged main power failures. In addition, some mines employ redundant configurations, such as dual substations, dual busbar power supply, and multi-level backup systems, creating multi-layered protection for the entire power supply chain, ensuring uninterrupted power supply even under any localized fault.
To ensure the continuity of underground power supply, intelligent monitoring and automation technologies play an irreplaceable role. Today, various mining enterprises are generally equipped with power monitoring systems, gas monitoring systems, and real-time automatic alarm systems. Through continuous collection and analysis of current, voltage, temperature, and power factor, these systems can promptly detect potential hazards such as overload, leakage, and insulation degradation, and automatically execute trip protection to prevent the escalation of faults. Simultaneously, integrated monitoring platforms can remotely switch, restart, or switch lines, making underground power supply operation more intelligent and controllable, and improving fault handling efficiency. With technological advancements, more mining areas are also beginning to use intelligent inspection robots to automatically inspect electrical equipment using infrared temperature measurement and image recognition, adding new safeguards for power supply stability.
Of course, to ensure the continuity of underground power supply, routine maintenance is equally crucial. Underground electrical equipment is susceptible to moisture, dust, temperature changes, and vibration; therefore, regular inspections must be scheduled, including checking cable insulation, tightening terminals, cleaning dust, replacing aging parts, and recording various operating parameters. In addition, regular load tests, insulation tests, and short-circuit protection tests are required to ensure that the equipment can still operate normally under high loads and extreme conditions. Maintenance personnel should strictly follow safe operating procedures, ensuring that all maintenance processes are recorded, supervised, and reviewed to prevent system risks caused by human negligence.
Continuous power supply to underground systems is a systematic project requiring coordinated support from multiple aspects, including power supply structure design, equipment selection, backup systems, intelligent monitoring, and maintenance management. Only by ensuring comprehensive redundancy design, sufficient backup power, accurate monitoring systems, and thorough daily maintenance can we truly ensure that underground production remains stable, safe, and efficient under any circumstances. For mining companies, this is not only a guarantee of production needs but also the core bottom line for protecting the lives of underground workers.
