Date Code 20151029 Protection Manual SEL-411L Relay
Section 10
P.Protection Manual
Basic Relay Operations
The relay is a powerful tool for power system protection and control.
Understanding basic relay operation principles and methods will help you use
the relay effectively. This section presents the fundamental knowledge you
need to operate the relay, organized by task. These tasks help you become
familiar with the relay and include the following:
➤ Inspecting a New Relay on page P.10.1
➤ Connecting and Applying Power on page P.10.3
➤ Establishing Communication on page P.10.4
➤ Changing the Default Passwords on page P.10.6
➤ Checking Relay Status on page P.10.10
➤ Making Simple Settings Changes on page P.10.13
➤ Operating the Relay Inputs and Outputs on page P.10.21
➤ Readying the Relay for Field Application on page P.10.27
Perform these tasks to gain a good understanding of relay operation, be able to
confirm that the relay is properly connected, and be more effective when using
the relay.
Inspecting a New Relay
The following items are included in your shipment from SEL:
➤ The Relay
➤ CD-ROM containing the electronic version of the entire Relay
Manual and the Customer Label Templates
➤ CD-ROM containing the ACSELERATOR QuickSet
®
SEL-5030
software program
➤ SEL Contact Card
➤ Configurable Front-Panel Label Kit
If any item is missing or damaged, please contact your distributor or SEL
immediately.
Initial Inspection
Perform the following initial inspection when the relay arrives:
Step 1. Remove the protective wrapping from the relay.
Step 2. Observe the outside of the front cover and the rear panel.
Step 3. Check that no significant scratches or dents are evident on any
outer surface.
Step 4. Confirm that all terminal strips on the rear panel are secure.
Do not connect power to the relay
until you have completed these
procedures and receive instruction to
apply power. Equipment damage can
result otherwise.
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