over-current protection relay / voltage / over-frequency / under-frequency
SEL-387E

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Characteristics

  • Measured/monitored value:

    voltage, over-current, over-frequency, under-frequency, over-excitation

  • Other characteristics:

    programmable

Description

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.