![]() ![]() ![]() The relay has 21 analog current inputs and three analog voltage inputs. Schweitzer Engineering Laboratories, Inc. SEL-487B Bus Differential Relay Busbar and Breaker Failure Protection, Automation, and Control System Major Features and Benefits The SEL-487B Relay provides bus current differential protection, circuit breaker failure protection, and backup overcurrent protection. Perform bay control functions for as many as five breakers and 20 disconnect switches using the built-in system mimic diagrams. Apply up to 5 three-phase restraint inputs, three independent restricted earth fault protection elements, and 2 three-phase voltage inputs, all with synchrophasors. Monitor and protect critical substation assets with comprehensive breaker wear and transformer thermal and through-fault monitoring. Sel 487e Relay Manual Protect and monitor most transformer applications with the powerful SEL-487E Transformer Protection Relay. Make any overcurrent element directional using voltage polarized directional elements as torque control inputs to the overcurrent elements. Apply the two three-phase voltage inputs for over- and undervoltage, frequency, and volts/hertz protection. Detect turn-to-turn winding faults for as little as two percent of the total transformer winding with the negative-sequence differential element. ![]() Use the three independent restricted earth fault (REF) elements for sensitive ground-fault detection in grounded wye-transformer applications. SEL-487E-3, -4 Transformer Differential Relay Three-Phase Transformer Protection, Automation, and Control System Major Features and Benefits The SEL-487E Transformer Differential Relay provides three-phase differential protection for transformer applications with as many as five three-phase restraint current inputs.
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