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1MRK 506 331-UUS A
Commissioning Manual
Commissioning and maintenance of the fault clearing system
test one IED at a time on live circuits where redundant protection is installed and de-
energization of the primary circuit is not allowed.
ABB protection IEDs are preferably tested by aid of components from the
COMBITEST testing system or FT test systems described in information B03-9510 E.
Main components are RTXP 8/18/24 test switch located to the left in each protection
IED 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.
Important components of FT test system are FT1, FTx, FT19, FT19RS, FR19RX
switches and assemblies as well as FT-1 test plug.
Preparation
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
Recording
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.
Secondary injection
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.
Alarm test
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
Section 7
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