2.38
SEL-421 Relay Instruction Manual Date Code 20171021
Installation
Connection
TiDL Connections
SEL-421 Relays that support TiDL have a 4U chassis. The SEL-421 supports I/O
on the main board as well as one additional I/O board. The main board and addi-
tional I/O board map to the 100- and 200-level inputs and outputs. The Axion
remote modules provide additional I/O for the 300, 400, and 500 levels and ana-
log channels.
The protection functions remain unchanged from the standard SEL-421 Relay.
Axion Remote Modules
The SEL-2240 Axion is a fully integrated analog and digital I/O control solution
that is suitable for remote data acquisition. An Axion node consists of a 10-slot,
4-slot, or dual 4-slot chassis that is configurable to contain a power module and
combinations of CT/PT, digital input (DI), or digital output (DO) modules.
SEL-2243 Power Coupler
Each chassis requires a SEL-2243 Power Coupler (see Figure 2.39). This module
supplies power to the rest of the node and transmits the data to the relay through
fiber-optic communication. Although the power coupler has two fiber-optic ports,
only PORT 1 is currently used for TiDL.
Figure 2.38 Axion Chassis
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