Date Code 20151029 Protection Manual SEL-411L Relay
Section 11
P.Protection Manual
Testing and Troubleshooting
This section contains guidelines for determining and establishing test routines
for the relay. Follow the standard practices of your company in choosing
testing philosophies, methods, and tools. The relay incorporates self-tests to
help you diagnose potential difficulties should these occur. The subsection
Relay Troubleshooting contains a quick-reference table for common relay
operation problems.
Topics, tests, and troubleshooting procedures presented in this section include
the following:
➤ Testing Philosophy on page P.11.1
➤ Testing Features and Tools on page P.11.6
➤ Relay Test Connections on page P.11.11
➤ Test Methods on page P.11.14
➤ Checking Relay Operation on page P.11.19
➤ Relay Self-Tests on page P.11.38
➤ Relay Troubleshooting on page P.11.43
➤ Factory Assistance on page P.11.46
The relay is factory calibrated; this section contains no calibration
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 the relay; 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 presented in Table 11.1.
NOTE: The relay checks that local
and remote currents are consistent
with those expected during a power
system fault. This is done in order to
secure the relay against
communications problems. Refer to
Test Precautions prior to testing in
order to ensure that your test
procedure is compatible with the
relay internal logic.
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