Protective relays and devices are used in an electrical distribution system to protect circuits from conditions like reverse-power flow, single phasing, or transients and surges. Directional power or reverse-power relays are examples, and they monitor the direction of current and can disconnect the circuit in response.
Modern distance protection relays operate using voltage supervision derived from sequence voltages and currents. Zero or negative sequence voltages and corresponding zero or negative sequence currents are derived.
Relays use voltage, current, and frequency set points to initiate an action, and can perform a wide range of functions — from grid isolation to load shedding to turning on a backup generator.
In this case, we are using an SEL 751 feeder protection relay to detect a grid outage and then initiate a method of grid isolation, such as a motorized breaker. First, we’ll set a few thresholds to detect grid loss using the Undervoltage, Overvoltage, Frequency, and Directional Power functions.
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Explore expert insights on energy storage protection for relay engineers in electric power transmission, control, and distribution.
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In this article, we’ll explain how protective relays work, review some of the most common relay functions for solar and energy storage systems, and provide best practices for …
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