Date Code 20090715 User’s Guide SEL-421 Relay
Section 4
U.User’s Guide
Basic Relay Operations
The SEL-421 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 SEL-421, organized by task. These tasks help you
become familiar with the relay and include the following:
➤ Inspecting a New Relay on page U.4.1
➤ Connecting and Applying Power on page U.4.3
➤ Establishing Communication on page U.4.4
➤ Changing the Default Passwords on page U.4.6
➤ Checking Relay Status on page U.4.10
➤ Making Simple Settings Changes on page U.4.13
➤ Examining Metering Quantities on page U.4.33
➤ Reading Oscillograms, Event Reports, and SER on page U.4.42
➤ Operating the Relay Inputs and Outputs on page U.4.56
➤ Configuring High-Accuracy Timekeeping on page U.4.71
➤ Readying the Relay for Field Application on page U.4.79
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:
➤ SEL-421 Relay
➤ Printed volume of the entire SEL-421 User’s Guide
➤ CD-ROM containing the electronic version of the entire
SEL-421 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.
Do not connect power to the relay
until you have completed these
procedures and receive instruction to
apply power. Equipment damage can
result otherwise.
Courtesy of NationalSwitchgear.com
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