Date Code 20020903 SEL-587Z Instruction Manual
Section 1
Introduction and Specifications
Introduction
The SEL-587Z Relay is a high-impedance differential relay operating on the
high-impedance principle. The unit provides three independent high-
impedance elements, three independent overcurrent elements, two
optoisolated inputs, four programmable output contacts, one alarm output
contact, and two serial communication ports. Differential elements are set in
volts for easy calculation of relay settings.
Apply the three independent high-impedance elements to single-zone bus
protection, reactors, generators, large motors, or use single elements on
grounded transformer windings as restricted earth fault protection. Use the
instantaneous overcurrent elements for transformer bushing faults and the
time-overcurrent elements to discriminate with other protection relays.
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