Otis Singleton
Electricity is crucial in modern mining, powering everything from drilling to processing. However, mining environments are notoriously dangerous, with electrical fatality rates far exceeding those of other industries. The harsh conditions, including dust, gases, and humidity, pose significant challenges to electrical safety. Mines are susceptible to explosions, cave-ins, flooding, and equipment accidents, which can be amplified by electrical hazards. To ensure safety, it is essential to isolate electrical equipment from flammable materials, carefully plan installations, and employ advanced safety features. Mining power centres, for instance, can enhance safety while also improving efficiency and reducing costs. Understanding and mitigating electrical risks in mines is critical to protecting workers and equipment.
| Characteristics | Values |
|---|---|
| Electrical fatality rate | 12 times higher than other US industries |
| Fatality rate for electrical-related injuries | 1 death for every 22 injuries |
| Common type of underground mining accident | Cave-ins |
| Cause of most mine-related electrical injuries and deaths | Contact with wiring, transformers, or other electrical components |
| Common issues with electrical accidents | Explosions, fires, and cave-ins |
| Climate in underground mines | Humid, wet, and damp |
| Safety features in mining power centers | Ground fault protection, arc flash protection, and thermal overload protection |
| Power output of mining power centers | 480-1,000 volts |
| Input power handled by mining power centers | 5-25 kilovolts |
| Power consumption in mines | 120MW per 100,000 tonnes of mined product per day |
| Power sources for mines | Utility plants, fuel-driven generator sets, gas-fired boilers, and renewable energy sources |
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What You'll Learn
Electrical safety in mines
Mining is considered the riskiest setting for the use of electrical power. Mining environments are known for their harsh conditions, which can threaten the safety and performance of equipment and workers. The electrical fatality rate in the mining industry is approximately eight to twelve times higher than that of other industries. Therefore, it is critical to take every safety precaution possible.
Before beginning any equipment installation or mining work, it is important to carefully plan and document everything related to the electrical equipment and its accessories. This includes designing and specifying the equipment, as well as achieving certification from the relevant authorities, such as the US Department of Labor's Mine Safety and Health Administration. Environmental conditions of the mine must be assessed, and electrical equipment must be isolated from dust, gases, and other flammable or explosive substances. Any hidden or buried cables must be clearly marked and documented, and control wiring and up-to-date electrical diagrams should be included in the plan.
To ensure electrical safety in mines, it is crucial to select wire, cords, and cables that are specifically approved for mining use by the Insulated Power Cable Engineers Association (IPCEA). These mining-approved cables are designed to withstand harsh mining conditions and are tailored to specific applications, such as off-track or mobile mining equipment. Additionally, mine electrical systems should incorporate excess current protection or, at the very least, be adequately sized, strong, and capable of withstanding various stresses. Conductors should be placed in secure locations with limited access, and equipment that uses oil for cooling, insulation, or suppressing arcing should be avoided due to its fire hazard potential.
To enhance safety, efficiency, and productivity, automation and artificial intelligence can be integrated with electric mining equipment. Intelligent systems can optimize energy usage, monitor machine health, and enable predictive maintenance. Mining power centres, or load centres, are also beneficial as they can provide power to multiple pieces of equipment simultaneously, reducing downtime and improving safety through features such as ground fault protection, arc flash protection, and thermal overload protection.
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Power quality disturbances
Power quality is critical in mining, as even brief interruptions can result in safety hazards, equipment damage, and production losses that can cost hundreds of thousands of dollars per hour. Mines consume vast amounts of power, up to 120 megawatts per 100,000 tons of mined product daily. The power systems in mining operations vary, but they generally follow a basic design: high-voltage power from the grid feeds high-voltage transformers that supply a main substation, which then distributes energy to secondary substations and directly to the mine's largest motor loads.
Voltage sags and extended undervoltage conditions are the most common power quality disturbances in underground longwall mining. They occur when a large increase in load current stresses the electrical supply system, causing the supply voltage to drop below the required levels for equipment to function optimally. Voltage sags are defined as a temporary reduction in voltage, typically lasting less than a minute but longer than 8 milliseconds, with a voltage reduction of 10% to 90% of the normal root mean square (RMS) voltage at 60 Hz. Undervoltage events are similar but last longer than a minute. Causes of sags and undervoltage in mines can include the initiation of high-power motors, transformer inrush, ground faults, short circuits, or issues with circuit breakers.
Other power quality disturbances in mining operations can include overvoltage swells, harmonic distortion, and total power interruption. The adoption of larger machinery with higher power requirements, extensive cabling, complex grounding, and harsh mining conditions all challenge the reliability of power supplies. Additionally, the integration of sophisticated electronics and automation in mining equipment has introduced new power quality challenges, as these systems are highly sensitive to power disturbances.
To address these issues, a multi-tiered approach is often necessary, starting with identifying the offending devices or systems causing the disturbances. This can include drives, motors, and pumps. By understanding the specific power quality problems, mitigation tactics can be developed to enhance safety, reliability, productivity, and cost efficiency.
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Mining power centres
One of the key advantages of mining power centres is their ability to simultaneously power multiple pieces of electric mining equipment. This not only increases efficiency by reducing downtime but also helps consolidate power delivery through a single centre. As a result, mining power centres contribute to reduced operating costs by eliminating the need to maintain and service multiple pieces of equipment individually.
The design of mining power centres prioritises safety and durability. They incorporate features such as fluidized epoxy bus insulation, which offers superior thermal and dielectric characteristics, and fully coated base assemblies that prevent corrosion and prolong equipment life. Additionally, mining power centres come with built-in protections against electrical hazards, including ground fault protection, arc flash protection, and thermal overload protection.
Furthermore, mining power centres play a crucial role in enhancing the environmental friendliness of mining operations. By utilising electricity instead of traditional fossil fuels, mines can significantly reduce the fuel required to power their equipment, leading to a decrease in climate pollution. The integration of automation and artificial intelligence within electric mining equipment further optimises energy usage, resulting in enhanced overall performance and cost savings.
To ensure the safe use of electricity in mines, it is imperative to carefully plan and implement safety measures. Mines are known for their hazardous conditions, including the presence of combustible dust and gases, which can lead to explosions and fires. Therefore, it is essential to isolate electrical equipment from these potential ignition sources and implement measures such as ground fault protection. Regular documentation and certification of electrical equipment designs, specifications, and diagrams are also critical aspects of maintaining electrical safety in mines.
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Automation and AI in electric mining equipment
The use of electricity in mining equipment is becoming increasingly common, with many processes now powered by electricity rather than diesel. This shift is vital, as electricity powers everything from the drilling to the hauling and processing of mined materials.
Automation and AI are key drivers of growth in the mining equipment market. The remote locations of mines make them well-suited for automation, and the use of AI can enhance safety, efficiency, and productivity. Intelligent systems can optimise energy usage, monitor machine health, and enable predictive maintenance, leading to improved performance and cost savings. Automation also removes human operators from dusty and noisy environments, improving safety and potentially attracting more people to the industry.
The electrification of mining equipment is not a new concept, but its prevalence has grown in recent years with technological advancements. The development and testing of autonomous mining equipment have been ongoing for over a decade, with OEMs like Caterpillar and Komatsu at the forefront. Autonomous haulage systems (AHSs) are now being deployed commercially, with the first use of driverless trucks in 2008.
The integration of automation and AI in electric mining equipment is expected to become more common, with advancements in batteries, fast charging, and autonomy set to revolutionize the industry. The use of robotics, autonomous vehicles, and remote-controlled operational systems will improve exploration tasks, while drones are already being used for inspections and to construct 3D models of surface mines.
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Electrical equipment and accessories
To ensure safety, it is vital to select electrical wires, cords, and cables specifically approved for mining by the Insulated Power Cable Engineers Association (IPCEA). Proper documentation and planning are essential before installing any equipment. This includes detailed records of designs, specifications, and diagrams of electrical equipment layouts, as well as clear marking of any hidden or buried cables.
Mining power centres, or load centres, are vital components that convert high-voltage electricity (5-25 kilovolts) to lower voltages (480-1,000 volts). These centres enhance safety by offering protections against overcurrent and providing features like metering, monitoring, and direct disconnect plugs. They also improve efficiency by powering multiple pieces of equipment simultaneously, reducing downtime and maintenance costs.
Motor control centres are often used in mines with high-powered equipment, featuring soft-start systems, PLC-controlled variable frequency drives, and across-the-line arrangements. Switchgears are another critical safety component, isolating high-voltage systems and protecting against electrocution risks.
To prevent power outages, understanding and managing power quality disturbances are essential. Mines should identify power quality issues and develop strategies to mitigate them, improving safety, reliability, and cost efficiency. Overvoltage conditions, caused by equipment contacting higher-voltage systems or transient phenomena, can lead to premature equipment failures and mysterious 'nuisance trips'. Therefore, preventing overvoltage is critical to maintaining mine uptime and avoiding weakened electrical components.
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Frequently asked questions
Mines are considered the riskiest setting for the use of electrical power due to the harsh conditions and volatile nature of electrical power in mining environments. To prevent electrical accidents, it is important to document everything related to electrical equipment and accessories, achieve certification, and choose wires, cords, and cables approved for use in mines. Additionally, planning factors such as isolating electrical equipment from dust, gases, and other flammable substances, as well as installing automatic power cutoff systems, are crucial to improving safety.
Mines experience various power quality disturbances, including overvoltage, voltage swells, and voltage variation. These issues can lead to premature equipment failures, reduced component life, and unexpected shutdowns, resulting in significant production losses. Power quality is critical in mining due to the extensive use of electricity and the high power requirements of large machinery.
Mining operations heavily rely on electric power, and preventing power outages is crucial. Mines can improve power reliability by sourcing electricity from utility plants, using fuel-driven generator sets, gas-fired boilers, or renewable energy sources. Additionally, understanding the diverse nature and complexity of mining equipment can help identify power quality problems and develop effective mitigation strategies to enhance safety, reliability, and cost efficiency.
Mining power centres, or load centres, are vital for converting high voltage electricity to lower voltage outputs, ensuring safety and meeting mine-use requirements. They can handle a wide range of inputs and outputs, providing power to multiple pieces of electric mining equipment simultaneously. This reduces operating costs, improves efficiency, and enhances safety with features like ground fault protection and thermal overload protection.
Underground mines have unique power requirements, supplying electricity to locomotives, drills, crushers, ventilation systems, and more. The climate in underground mines is often humid and damp, posing challenges for electrical wiring and cables. Surface mines, on the other hand, power equipment like rope shovels, drills, and excavators, which are more power-hungry. Both types of mines must carefully manage electrical safety to prevent accidents and ensure reliable operations.
