SEL-487E Transformer Protection Relay

Ethernet communications, you can easily detect reactive

loop flows, turn state estimation into state measurement,

and provide early warning of potential system instability.

Real-time control is possible by receiving synchrophasor

messages from two PMUs, and you can take action based

on time-synchronized local and remote measurements.

Digital Secondary System Technologies

Modernize your substation by applying SEL TiDL or SEL

SV technology. Both of these digital secondary system

solutions replace copper wires with fiber-optic cables to

increase safety, reduce costs associated with using copper

wires, and limit the impact of electromagnetic interference.

TiDL is a simple and secure point-to-point solution that is

easy to implement, with no external time source or network

engineering required. SEL-TMU TiDL Merging Units placed

in the yard digitize signals and transmit them over fiber

optic cables to the SEL-487E-5 TiDL relay in the control

house.

SEL SV combines protection in the merging unit with the

f

lexibility of IEC 61850-9-2 or IEC 61869-9 protocols. SEL

SV merging units digitize signals and transmit them via

Ethernet over fiber-optic cables to SEL SV relays or other

manufacturers’ compliant relays in the control house.