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Electric utilities are steadily increasing the quantity of intelligent field devices deployed on distribution feeders to improve service reliability and optimize grid efficiency and capacity. As the individual capabilities of the field devices expands, there is a corresponding increase in data flow and two-way communications exchange between field devices and the central control system. While there...
A single Community Energy Storage (CES) Unit consists of a battery, power conversion system, and control system integrated in a small enclosure typically located adjacent to a distribution transformer serving a small number of customers. By placing distributed energy storage in close proximity to customers, the CES unit provides immediate, automatic power restoration in the event of an outage. A Distributed...
Every electric utility has some unique combination of power equipment, software systems, and communications systems to operate their distribution networks. No two systems are alike, yet they all share the same end goal of providing electric service to all customers in a reliable, efficient, and safe manner.
Fuse-saving practices have coordination limitations at higher current levels — it is common for the upline device to trip and the fuse to operate at the same time. The result is frequent momentary outages for many customers and blown fuses, even for temporary faults. These challenges have led some utilities to abandon the practice of fuse-saving and instead migrate to a fuse-blowing philosophy. The...
A common practice for improving electric service reliability is to provide an alternate source of supply. On the distribution system, two feeders — each with one or more mid-line overcurrent protective devices — can be tied together through a normally-open tie point to restore service to unfaulted sections of line. Conventional looped distribution systems rely on overcurrent coordination to ensure...
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