ABB RELION REL670, Руководство по установке и пусконаладке

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Periodic maintenance tests Chapter 12
Commissioning and maintenance of
the fault clearing system
Testing of protection relays shall preferably be made with the primary circuit de-energized. The
relay cannot protect the circuit during testing. Trained personnel may test one relay at a time on
live circuits where redundant protection is installed and de-energization of the primary circuit is
not allowed.
ABB protection relays are preferable tested by aid of components from the COMBITEST testing
system described in information B03-9510 E. Main components are RTXP 8/18/24 test switch
located to the left in each protection relay and RTXH 8/18/24 test handle which is inserted in
test switch at secondary testing. All necessary operations such as opening of trip circuits,
short-circuiting of current circuits and opening of voltage circuits are automatically performed
in the right order to allow for simple and safe secondary testing even with the object in service.
3.2.1 Preparation
Before starting maintenance testing the test engineers should scrutinize applicable circuit dia-
grams 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 set-
tings. Blank test records to fill in measured values.
3.2.2 Recording
It is of utmost importance to carefully record the test results. Special test sheets covering the fre-
quency of test, date of test and achieved test values should be used. Relay setting list and proto-
cols 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 ex-
change is made and the new measured values are recorded. Test records for several years of test-
ing 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.
3.2.3 Secondary injection
The periodic maintenance test is done by secondary injection from a portable test set. Each pro-
tection shall be tested according to the secondary injection test information for the specific pro-
tection 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 ad-
justed, the new value recorded and a note should be made in the test record.
3.2.4 Alarm test
When inserting the test handle the alarm and event signalling is normally blocked. This is done
in IED670 by setting the Event reporting to off during the test. This can be done when the test
handle is inserted or the IED is set to test mode from the LHMI. At the end of the secondary
injection test it should be checked that the event and alarm signalling is correct by activating the
events and performing some selected tests.
3.2.5 Self supervision check
Once secondary testing has been completed it should be checked that no self supervision signals
are activated continuously or sporadically. Especially check the time synchronizsation system,
GPS or other, and communication signals, both station communication(61850/SPA/LON..) and
remote communication, for example line the differential communication system.