over-current protection relay / voltage / over-frequency / under-frequency
voltage, over-current, over-frequency, under-frequency, over-excitation
Current Differential and Voltage Relay
The SEL-387E Current Differential and Voltage Relay provides protection to two- or three-winding power transformers. Voltage inputs for power metering, overexcitation protection, and over-/underfrequency load shedding provide versatile solutions for power apparatus protection. Automation features reduce total project construction and operation costs through elimination of traditional external control switches, meters, and indicating lamps.