performed in the right order to allow for simple and safe secondary testing even with
the object in service.
Important components of FT test system are FT1, FTx, FT19, FT19RS, FR19RX
switches and assemblies as well as FT-1 test plug.
15.2.2.1 Preparation
SEMOD56528-10 v2
Before starting maintenance testing, the test engineers should scrutinize applicable
circuit diagrams and have the following documentation available:
• Test instructions for protection IEDs to be tested
• Test records from previous commissioning and maintenance tests
• List of valid settings
• Blank test records to fill in measured values
15.2.2.2 Recording
SEMOD56528-14 v2
It is of utmost importance to carefully record the test results. Special test sheets
covering the frequency of test, date of test and achieved test values should be used.
IED setting list and protocols from previous tests should be available and all results
should be compared for differences. At component failures, spare equipment is used
and set to the requested value. A note of the exchange is made and the new measured
values are recorded. Test records for several years of testing should be stored in a
common file for a station, or a part of a station, to give a simple overview of the period
of testing and achieved test values. These test records are valuable when analysis of
service disturbances shall be done.
15.2.2.3 Secondary injection
SEMOD56528-17 v2
The periodic maintenance test is done by secondary injection from a portable test set.
Each protection shall be tested according to the secondary injection test information for
the specific protection IED. Only the setting values adopted shall be checked for each
protection function. If the discrepancy between obtained value and requested set value
is too big the setting should be adjusted, the new value recorded and a note should be
made in the test record.
15.2.2.4 Alarm test
SEMOD56528-20 v4
When inserting the test handle of RTXP or using FT plugs, the alarm and event
signalling is normally blocked. This is done in the IED by setting the event reporting to
Disabled during the test. This can be done when the test handle is inserted or the IED
is set to test mode from the local HMI. At the end of the secondary injection test it
1MRK 502 073-UUS A Section 15
Commissioning and maintenance of the fault clearing system
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 293
Commissioning manual
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