ABB Relion 670 Series Commissioning Manual page 264

Section 13
Commissioning and maintenance of the fault clearing system
13.2.1 Visual inspection
Prior to testing, the protection IEDs should be inspected to detect any visible damage that may
have occurred (for example, dirt or moisture deposits, overheating).
Make sure that all IEDs are equipped with covers.
13.2.2 Maintenance tests
To be made after the first half year of service, then with the cycle as proposed above and after any
suspected maloperation or change of the IED setting.
Testing of protection IEDs shall preferably be made with the primary circuit de-energized. The IED
cannot protect the circuit during testing. Trained personnel may 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 usually 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.
13.2.2.1 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
13.2.2.2 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
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When protection IEDs are combined with built-in control, the test interval can be
increased drastically, up to for instance 15 years, because the IED continuously
reads service values, operates the breakers, and so on.
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Line distance protection REL670
Commissioning manual