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NEPSI Commissions Harmonic Filter System for Morenci Mine

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Tuesday Feb. 11, 2014

Queensbury, NY – NEPSI, the leading world supplier of medium-voltage metal-enclosed capacitor banks and harmonic filter systems, recently commissioned two harmonic filter systems for the Morenci Mine. The filters provide var support and harmonic mitigation for Morenci's dual pinion semi-autogenous (SAG) mill. The mill is used to reduce the size of the ore at the company's Copper mine in Morenci Arizona. The project was completed on-time and on-budget.

First awarded in April of 2013, the project involved the design, fabrication, testing, and commissioning of two multi-tuned harmonic filter systems. The filter systems were shipped Oct. 4, 2013 and installed by Morenci Mine. Metal-enclosed equipment was chosen over conventional open-rack mounted equipment on the bases of lower costs and higher reliability.

"The equipment offers lower total cost of ownership as it is a pre-packaged and totally engineered solution requiring less contract engineering, labor, maintenance and footprint area", says Paul Steciuk, president of NEPSI. "The increasing acceptances of metal-enclosed harmonic filter systems by mines around the world attest to their benifits. Mines are looking for ways to improve reliability and reduce cost - and they see that with our product".

The filters consisted of 2nd C-Type, 5th High-pass, and 11th Notch tuned branches with a total output rating of 11 MVARs (22 Mvars for the complete filter system) and are equipped with an integral fixed-mounted SF6 circuit breaker that provides both protection and switching functions.

The enclosure was constructed to withstand the harsh environmental conditions of the mine and to reduce heating from solar radiation. The filter system is compartmentalized, much like switchgear, to allow for the highest degree of reliability and reduction in collateral damage for system faults. Additional protections were incorporated to reduce Arc Flash energy and pressure should a fault occur, and supervisory control and gateway communication to the mine's DCS system were also included.

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