Chapter 1: Mathematical model and application of overcurrent relays
Abstract
Historically, overcurrent relays (OCRs) were one of the first forms of protection for power electrical systems, and today they are the most widely used protection devices in electrical networks. These relays are applied by means of an arrangement of devices that are capable of acting in the event of faults or disturbances in any section of the electrical system, and of acting automatically after the disconnection of devices and/or the emission of alarm signals. Phase OCR are assigned to each of the phases for three-phase and phase-to-phase faults, whereas for the protection of ground faults, a relay connected to neutral is used. A relay protection system may consist ...
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