Date Code 20171006 Instruction Manual SEL-400 Series Relays
SEL-400 Series RelaysInstruction Manual
SECTION 19
Remote Data Acquisition
SEL-400 series relays can receive analog and binary inputs from remote data
acquisition systems. This technology provides flexible solutions, reduces the cost
of copper, and improves overall safety in the substation.
Time-Domain Link (TiDL)
Some SEL-400 series relays can receive remote analog and binary inputs from
the SEL-2240 Axion. The Axion provides the remote analog and binary data over
an IEC 61158 EtherCAT, TiDL network. This technology provides very low and
deterministic latency over point-to-point architecture. Point-to-point architecture
eliminates the need for time synchronization between the remote data acquisition
units and the relay. In addition, it eliminates the complex communications net-
work often associated with remote data acquisition and simplifies the program-
ming and installation process.
Some of the benefits of a TiDL system include:
➤ Use ACSELERATOR QuickSet SEL-5030 Software to set the relay as
you would conventional SEL-400 series relays. Firmware for the
SEL-400 series relays was modified for the implementation of TiDL;
however, the settings and protection algorithms were unchanged.
➤ Decrease costs through copper reduction.
➤ Simplify the installation process.
➤ Increase safety in the substation by removing high-energy cables
from the control house. This also eliminates the concern of an open
circuited CT when a relay is removed from service.
SEL-400 series relays with TiDL can receive as many as eight fiber links from as
many as eight Axion remote data acquisition nodes. Not all nodes have to supply
analog data—some can supply digital input and output (I/O) only. The firmware
will recognize and validate the connected Axion modules and determine if they
match a predefined supported topology. The supported topologies are balanced
between copper reduction and the number of required remote Axion nodes. Refer
to Section 2: Installation in the product-specific instruction manuals to review the
supported TiDL topologies.
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