Sel 411L - Relay Test Connections

P.11.11
Date Code 20151029 Protection Manual SEL-411L Relay
Testing and Troubleshooting
Relay Test Connections
Relay Test Connections
The relay is a flexible tool that you can use to implement many protection and
control schemes. Although you can connect the relay to the power system in
many ways, connecting basic bench test sources helps you model and
understand more complex relay field connection schemes.
Test Setup
Test Source Connections
For each relay element test, you must apply ac voltage and current signals to
the relay. The text and figures in this subsection describe the test source
connections you need for relay protection element checks. You can use these
connections to test protective elements and simulate all fault types.
Multiterminal 87L Test Connections
Use this connection to concurrently test all relays and their associated
communications. The relays may be located in a single location (lab
acceptance test) or may be located in remote substations (commissioning test).
In the latter case, each of the relay test sources would typically be GPS
synchronized. The test requires that communications are established between
each of the relays in the zone.
NOTE: The procedures specified in
this subsection are for initial relay
testing only. Follow your company
policy for connecting the relay to the
power system.