Date Code 20171006 Instruction Manual SEL-400 Series Relays
Instruction Manual
SECTION 10
Testing, Troubleshooting, and Maintenance
This section address the philosophy of relay testing, general approaches to testing
and troubleshooting, troubleshooting common problems, and a few maintenance
items. This section begins with guidelines for determining and establishing test
routines for SEL-400 series relays. Follow the standard practices of your com-
pany in choosing testing philosophies, methods, and tools. The relay incorporates
self-tests to help you diagnose potential difficulties should they occur. The sub-
section Relay Troubleshooting contains a quick-reference table for common
relay operation problems.
Topics presented in this section include the following:
➤ Testing Philosophy on page 10.1
➤ Testing Features and Tools on page 10.5
➤ Test Methods on page 10.7
➤ Relay Self-Tests on page 10.15
➤ Relay Troubleshooting on page 10.18
➤ Maintenance on page 10.22
➤ Technical Support on page 10.31
All SEL-400 series relays are factory calibrated; this section contains no calibra-
tion information. If you suspect that the relay is out of calibration, contact your
Technical Service Center or the SEL factory.
Testing Philosophy
Protective relay testing generally consists of three categories: acceptance testing,
commissioning testing, and maintenance testing. The categories differ in testing
complexity and according to when these activities take place in the life of the
relay.
Each testing category includes particular details as to when to perform the test,
the testing goals at that time, and the relay functions that you need to test. This
information is a guide to testing SEL-400 series relays; be sure to follow the
practices of your company for relay testing.
Acceptance Testing
SEL performs detailed acceptance testing on all new relay models and versions.
We are certain that your relay meets published specifications. Even so, you can
perform acceptance testing on a new relay model to become familiar with the
relay operating theory and settings; this familiarity helps you apply the relay
accurately and correctly. A summary of acceptance testing guidelines is pre-
sented in Table 10.1.
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