performed in the right order to allow for simple and safe secondary testing even withthe object in service.Important components of FT test system are FT1, FTx, FT19, FT19RS, FR19RXswitches and assemblies as well as FT-1 test plug.15.2.2.1 Preparation SEMOD56528-10 v2Before starting maintenance testing, the test engineers should scrutinize applicablecircuit 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 values15.2.2.2 Recording SEMOD56528-14 v2It is of utmost importance to carefully record the test results. Special test sheetscovering 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 resultsshould be compared for differences. At component failures, spare equipment is usedand set to the requested value. A note of the exchange is made and the new measuredvalues are recorded. Test records for several years of testing should be stored in acommon file for a station, or a part of a station, to give a simple overview of the periodof testing and achieved test values. These test records are valuable when analysis ofservice disturbances shall be done.15.2.2.3 Secondary injection SEMOD56528-17 v2The 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 forthe specific protection IED. Only the setting values adopted shall be checked for eachprotection function. If the discrepancy between obtained value and requested set valueis too big the setting should be adjusted, the new value recorded and a note should bemade in the test record.15.2.2.4 Alarm test SEMOD56528-20 v4When inserting the test handle of RTXP or using FT plugs, the alarm and eventsignalling is normally blocked. This is done in the IED by setting the event reporting toDisabled during the test. This can be done when the test handle is inserted or the IEDis set to test mode from the local HMI. At the end of the secondary injection test it1MRK 502 073-UUS A Section 15Commissioning and maintenance of the fault clearing systemGenerator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 293Commissioning manual
