Coal Age

MAY 2019

Coal Age Magazine - For more than 100 years, Coal Age has been the magazine that readers can trust for guidance and insight on this important industry.

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22 May 2019 power distribution continued circuits, lighting, a load center, and GFCI receptacles for utility power requirements. The low-voltage out- put circuits, available in 30-amp to 6,000-amp capacities, feature full- ground fault and ground-check protection, and the control cir- cuit fuses have blown-fuse indi- cators for quick troubleshooting. The three-phase circuits consist of output panels, each equipped with output receptacles protected by cir- cuit breakers. The output module is equipped with meters for a quick readout of voltage and current. The coupled configuration also displays the voltage and current. An internal Ethernet switch is provided for con- nection to mine monitoring systems and can read input, output, feed- through current and the status of the starter circuits. Depending on the capacities and requirements of each individu- al mine, the main transformer can either be a liquid-filled transformer or Line Power Mine-Duty dry-type transformer. High-efficiency trans- formers can be provided for either option to help reduce operating loss- es and costs. Copper buss bar is stan- dard for both sections. Operation At the start of a mining section, the Modular Power System performs as a standard power center with the two halves being connected. As the section advances, rather than shut- ting down the section and move the power center, the mine can in- stall a second-input module using the feed-through circuit from the original modular power center. Be- cause the feed-through circuit in the original Modular Power System is controlled via a vacuum circuit breaker, the cabling can be installed and connected to the second input module while the mining operation continues uninterrupted. Once the second input module is installed, the output module of the original power center can be moved and connected to the second input module, and the system re-energized. This greatly re- duces the downtime needed to make an advance. As the section or tunnel continues to advance, this process can be repeated as necessary. "Setup time and downtime are costly in mining," said Mark Grom- lovits, director of engineering, Elec- tro-Mechanical Corp. "Mine owners and operators can't afford to lose valuable time while moving a power source out of one section or tunnel to another. The modular concept allows our customers to prepare in advance of moves. This solution is all about saving setup time and ensuring con- tinued operations." As the mine continues to advance, the cost savings using this modular approach becomes apparent. The cost of additional input modules come at a fraction of the cost for a complete power center. Each time the chain is extended, savings are compounded. In addition, the setup of another input module can be com- pleted concurrently with mine pro- duction, minimizing downtime while advancing the mining equipment. In addition to cost savings, in- dividual modules can be modified, retrofitted or upgraded for different As the section advances, rather than shutting down the section to move the power center, the mine can install a second input module using the feed-through circuit from the original modular power center.

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