Engineering & Mining Journal

JUL 2019

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ELECTRICAL POWER SYSTEMS 42 E&MJ • JULY 2019 www.e-mj.com "One key area showing great oppor- tunity is in the lifecycle extension of low-voltage motor control centers," ex- plained Dave Durocher, global industry director at Eaton. "New design micropro- cessor-based motor protective relays de- liver enhanced functionality compared to legacy counterparts that improves motor protection and functionality. These so- phisticated relays can be easily retrofit- ted into existing assemblies. Care should be taken to assure that addition of new components or sub-assemblies conform to the current test standards for a give class of assembly." Earlier this year, Eaton introduced Power Xpert Release (PXR), a new glob- al line of electronic trip units for both molded case and low-voltage power cir- cuit breakers, that are tested to global standards. Circuit breakers with the Pow- er Xpert Release trip units leverage em- bedded communications capability to do the work previously required by multiple components, delivering critical informa- tion to analyze safety and system power dynamics. These capabilities are avail- able in smaller, lower ampacity breakers than ever before, providing more granular information on connected systems and enabling greater uptime. Durocher explained: "Eaton's PXR trip units provide new protective features such as multiple load alarms and ground fault alarms with Industry 4.0-ready em- bedded communications and onboard metering. A breaker health algorithm is included as part of the standard offer- ing. This algorithm tracks and records the number and magnitude of circuit in- terruptions, operating temperature, run time and other parameters to determine the estimated remaining life of the circuit breaker. The trip unit then signals to the user that it's time for the circuit breaker to be replaced prior to failure." In systems that require hundreds of molded case or low-voltage power circuit breakers, real-time data from the intelli- gent circuit breaker can be tracked and analyzed to prompt condition-based main- tenance — an easier, faster and far more cost-effective way to maintain an electrical system than traditional methods. Eaton was recently awarded a contract to supply two skid-mounted substations for Freeport McMoRan's open pit copper mine in Morenci, Arizona. These assem- blies, engineered and constructed by a local OEM, Arizona Electrical Apparatus, include a 46 kV to 4,160 V, 10 MVA Ea- ton Power Systems, substation transform- er and 4,160 V Eaton metal-clad VCP-W vacuum switchgear. "The switchgear vacuum breakers in - clude a newly developed integral motor- ized racking mechanism that allows op- erators to remotely switch and rack the breakers on and off the energized bus. This assures operators are outside of the flash protection boundary. Controls for the new motorized racking are network enables so operators can establish a ze- ro-energy condition before approaching the switchgear," Durocher said. One Eye on Security Incorporating network connectivity into al- most every new product brings enhanced functionality but it can also bring risks. Durocher explained: "Eaton has a pro- active and consistent enterprise-side ap- proach to cybersecurity that provides cus- tomers with confidence that our digital solutions meet rigorous testing standards to operate securely worldwide. "For years, Eaton has maintained strict procedures at every stage of the product development process. This discipline has paved the way for a collaboration with global safety science organization UL that is establishing measurable cyber securi- ty criteria for network-connected power management products and systems. We have the capability to test Eaton products with intelligence or embedded logic to key aspects of UL 2900-1 and 2900-2-2 standards that apply to network-connect- ed power management products." The expectation of any buyer purchas- ing a product is security from cyber threats. However, this is still a relatively new and important aspect of product quality. At Eaton, new product development includes verification that a single com- ponent or any group of components in a system is certified secure. "Today there is disparity in cyber se- curity standards, some with more rigor, requiring third-party certification, and others that define self-certification as acceptable," Durocher said. "These standards will one day be globally har- monized, but until that happens, it will be important for mine operators to un- derstand the differences and expect product suppliers to demonstrate com- pliance." Independent, third-party au- thentication offers peace of mind. With products tested in specialized labs, customers can rest easier knowing that devices are compliant with industry cy- ber security requirements before they're installed in critical systems. Cyber security is also a key concern for Siemens. The company has one of the broadest ranges of products, systems and solutions for the power distribution and control in mines, ranging from local gen- Eaton 10 MVA skid-mounted substation applied as a mobile power unit transported across the FMI Morenci open-pit copper mine. (Photo: Eaton)

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