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Choosing the right processor for the mining industry

Introduction

The United States is one of the industries largest mining worldwide - an industry closely tied to the economy. In the past, the discovery of resources such as gold and oil has led to displacement of large populations and rapid growth for the former remote regions of the country, like California, Texas and Alaska. The extraction of these resources and find new deposits, continues to provide the foundation of local economies in some regions.

Some mineral mined in the U.S. are coal, uranium, copper, gold, silver, iron, lead, zinc and others. Most mines in the United States are highly automated and therefore energy. To provide for example, even in the last decade of the 20th century, mining of iron ore consumes 62.3 trillion Btu alone energy on a calendar year. Because mining is an important industry and make an important contribution to national income, the mines must have a reliable source of energy - a critical resource for the extraction process.

The mining and mining of both the United States and worldwide is largely based on energy to exploit natural resources such as aggregates, precious metals, iron ore, oil, gas and coal. This energy is used for shovels and drills for excavating these products are loaded into trucks or huge mines on conveyer belts, sorting, screening and crushing of ore, heating, and hundreds of other functions.

The surface and underground mining operations rely on equipment supplied to the extraction of materials and loading trucks. Overall, the mining sector could not prosper without the use of large amounts of energy.

The role of processors

Mine "power centers" or charge "centers" are an essential system for work underground mining area. Their main function is to convert the voltage distribution in operating voltage for the operation of equipment, placing power transformers inside the load center. Suitable selection of transformers is imperative and must meet safety reliability and efficiency requirements. Determination of the nominal capacity is among the first steps of selecting a transformer power to a load center of mines. A rule of thumb here is to allow a power kVA for each of the connected load. Most mining methods, however, does not produce constant loads - all the machines are not connected all the time - and thus a horse kVA rule of thumb usually leads to oversizing transformer. According to the Handbook of mines by Howard L. SME Hartmann, "Past experience and demand established by the manufacturers and operators with the power of the connected load, are essential to determine the processor capacity. For other typical underground mines power in kVA may be in the range 50-80% of connected load. "

Transformer losses

Standard processors while the full load operation of 90-95% efficiency, this figure drops as the load lightens. This is due to inefficiency in the transformer core, a main component of the transformer. The losses in the core remains the same throughout the operating range of the transformer. At 100% load, the amount of the loss is negligible compared. However, at reduced loads, the same amount of energy loss represents a greater percentage High energy wasted. Unfortunately, the average transformer loads run between 34 and 50% of the total capacity transformer. With the majority electricity consumed in the United States running through these transformers lower loads, huge quantities energy are wasted.

This problem is of particular importance to the mining industry, simply because of its consumption High energy. The mining operations also involve harsh environments with dust, dirt, chemicals, humidity and air contaminants. Load center transformers need to operate reliably and effectively in these environments over the long term.

Without electric power facilities in the mining, the natural materials extracted from the earth in the mining process would be much more expensive than they are today. Thus, the power transformers to provide a lot of muscle, the ability and stability to a vital industry. Drilling trenches for busting up rock, carting huge loads of materials and drawing up amounts of heavy minerals, power transformers to provide the strength and capacity.

Fluid-filled transformers and Dry: Performance Characteristics

1. Liquid filled transformers

While there is still debate about the relative merits of the available types of processors, there are performance characteristics that have been accepted:

• The transformers are more efficient liquid, have a greater overload capacity and longer life

life expectancy.

• liquid units are better at reducing the coil temperatures hot-spot, but have a higher risk of

flammability standard sec.

• Processors may require liquid hollow containment to guard against leakage of liquid.

• transformers filled with liquid are smaller than the dry type units for the same power

capacity and the losses are lower because of their characteristics better heat dissipation.

1. Dry Type Transformers

Dry type transformers are generally used to lower ratings (the tipping point of 500 kVA to 2.5MVA). They are generally placed inside a building to serve office / apartment. dry-type units usually come in pens with shutters, or sealed.

The dry type transformers use almost flammable materials and therefore do not constitute a fire hazard when used in both underground coal and other processors mines.Dry type in the mining industry are housed in a steel tank and the core and windings are cooled by circulating air in the tank heat transfer to the steel tank which is in turn cooled by outside air. In some compact models for mounting on the farm Mineral water cooling machine is added to further improve the performance of processors.

Correct choice of insulation materials and a better understanding of the cooling system is imperative if the transformer must be properly designed. For example, a temperature rise test done on a processor manufactured and sold as noted continuously, may reveal that the transformer has a continuous rating of 65% of rated power.

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The Need for mining, energy efficient

With emphasis now on climate change and reducing the environmental impact, government agencies worldwide are increasingly demanding requirements of industries to reduce energy consumption and waste management more efficient, among others. It is surprising how the operation Mining continues to use technology twenty years.

regulatory pressures have already begun to influence industry Mining - according to an article on "Environmental Regulations of the United States and the mining industry on the International Development Research Centre (IDRC) website, "The environmental regulations have had an effect on the mining industry of the United States the cost of. Businesses have been forced to upgrade or renovation of facilities or exit the market. The increase in operating costs have affect their international competitiveness, and to some extent, this may change the allocation of world mining investment. Employment levels have plummeted, and local economies have borne part of the cost. "

Mining companies in the U.S. are feeling the pressing need to be energy efficient, simply to stay competitive.

Reducing energy consumption by adopting measurement, cost effective solutions such as transformers and control NEMA approved solar or wind power to meet their future needs energy can be good ideas in the long term, particularly as the option of alternative energy will help mining companies take away from the fluctuations in international prices of fuels. Alternative energy sources are still a very small blip on the graph in terms of power real provided by industries such as mining, and therefore the sector as a whole needs more immediate ways to conserve energy.

Pacific Crest Transformers and mining

Pacific Crest Transformers (PCT) has provided solutions to the mining industry since its inception in 1919. Over the past 90 years the PCT has had more than 100 customers in this industry worldwide. PCT has experience in construction on base, the secondary station and unit transformers, and now specializes in environmentally friendly and efficient distribution transformers filled with liquid.

PCT transformers custom designs, after consultation with clients developed. Transformers PCTs are all based on customer specifications and are designed to fit the existing infrastructure.

Custom PCT constructed different types of transformers for the mining industry:

PCT processors can be used in different wells open and hard rock (underground) applications ranging from lighting loads auxiliary power for cranes, conveyor belts, lines, and other Application variables dedicated controller. PCT also ensures reliable processing operation in hostile environments containing moisture, dust, dirt, chemicals and other contaminants.

Conclusion

On one hand the mining industry is ready to move to meet the growing demand, the other he has to stay as competitive fuel prices zooming upward. For an industry-intensive energy, keeping a check on fuel consumption and cost is critical. Thus, the mining industry as a whole is looking for energy efficient technologies, including power transformers. As companies in the mining industry see more opportunities energy, the PCT has the expertise and experience to provide processors tailored for energy saving all requirements of the load center.

More About Transformers Visit Pacific Crest Transformers Website.

About the Author

Mick Dickinson is contributing author for Pacific Crest Transformers