19.2
SEL-400 Series Relays Instruction Manual Date Code 20171006
Remote Data Acquisition
Time-Domain Link (TiDL)
SEL-400 series relays that support TiDL are only available in a 4U chassis. These
relays support an I/O board on the relay, and, when applicable, main board I/O.
These I/Os will be mapped to the 100- and 200-level inputs and outputs. Axion
remote modules provide additional I/O by using the internal digital Relay Word
bits for the 300, 400, and 500 levels of the relays. Note that when the relay part
number supports TiDL, all output settings for I/O are available. Correctly set
these outputs for what is installed because all output settings will be available but
all may not be physically installed in your system.
Relay Word bits IO300OK, IO400OK, and IO500OK indicate the status of
installed I/O boards in standard relays or whether a remote module is commis-
sioned, such as in a TiDL system. These bits can also identify whether a board is
installed or when a remote I/O module fails.
Figure 19.1 Sample TiDL System Topology
SEL Relay
SEL Axion
SEL AxionSEL Axion
SEL Axion SEL Axion
IAW
IBW
ICW
VAY
VBY
VCY
IAX
IBX
ICX
1 Phase
(VBZ)
1 Phase
(VAZ)
Line
Substation Yard
Control House
Figure 19.2 Rear Panel of Relays With TiDL
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