Distance protection is and remains by far the main protection principle for overhead lines and cables. It is reliable, fast and largely manages to eliminate the variable system quantities of load and supply out of the protection calculation.
Distance protection is in its core an impedance measurement, comparing a known line impedance against a measured system impedance. A modern distance protection IED (Intelligent Electronic Device) has to deal with many more features though; phase selection, load encroachment, power swing detection, scheme communication, phasor measurement, monitoring, control, and backup protection – a wide variety of tasks are performed, differing from installation to installation and customer to customer.
In order to cope with any situation, a modern protection IED needs to be configurable to fit within its intended application area. Hitachi Energy's solution to this requirement is the Relion series of IEDs. The Relion series offers a standardized library of the functionality on a high performance, common hardware architecture, and provides the flexibility and configurability to suit any application area.
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