19.5
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Remote Data Acquisition
IEC 61850-9-2 Sampled Values (SV)
A simple commissioning process identifies the connected TiDL system and veri-
fies it matches one of the supported relay topologies. Once the commissioning
process is complete, the topology is stored in memory. At each additional relay
startup, the firmware validates that the connected modules match those of the
stored configuration. It recognizes if any CT/PT modules within the node have
changed. See Section 2: PC Software in the product-specific instruction manual
for more information on commissioning.
Secondary injection testing takes place at each Axion node. Test sources are
required to inject voltages and current to the Axion node to verify correct instal-
lation and mapping. Monitoring of the voltages and currents will remain in the
control house at the relay location.
IEC 61850-9-2 Sampled Values (SV)
Some SEL-400 series relays are available with the capability to either publish or
subscribe to remote analogs in accordance with the UCA International Users
Group’s “Implementation Guideline for Digital Interface to Instrument Trans-
formers Using IEC 61850-9-2,” This type of remote data acquisition is a subset
of IEC 61850-9-2 and specifies, among other things, logical devices, dataset con-
tents, sampling rates, the time-synchronization method, and the message format.
The 9-2LE guideline clarified ambiguities in the 9-2 standard, improving interop-
erability between SV devices from different manufacturers.
Architecture
9-2LE uses OSI Layer 2 multicast messages on standard Ethernet network archi-
tecture. Merging units such as the SEL-421-7 with SV publication capability
enabled or the SEL-401 Merging Unit sample remote analog values, convert
them to digital signals, and then publish them over the Ethernet network. Two
key components of SV messages (besides the current and voltage data) are the
Figure 19.7 SEL-2245-42 AC Analog Input Module
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