1MRS750886-MUM
61
REU 513
User’s Guide
ABB Substation Automation
Products and Systems
2.
Secondary testing
According to the manufacturer’s recommendations the relay should be submitted to
secondary testing at five years’ intervals to ensure proper operation. Testing should
always be performed in accordance with national regulations and instructions.
When auxiliary voltage is connected to the protection relay, the relay performs a
self-testing program, which does not include the matching transformers and the
output contacts. The operational condition of the relay is tested by means of ordinary
relay test equipment. Such a test also includes the matching transformers, output
contacts and accuracy of the operate values.
The secondary testing described in this manual is based on the relay’s setting values
during normal operation. (If necessary, the secondary testing can be extended by
testing the protection stages throughout their setting ranges.)
All setting values that are altered during the test procedure have to be read and stored
prior to the tests so that they can be restored after the tests.
To enable secondary testing the relay has to be disconnected, either through
disconnectable terminal blocks or a test plug fitted on the relay. According to the
disconnecting method used, the test plug has to be removed or the terminal blocks
connected after the test.
Equipment required for testing:
•
adjustable voltage transformer 0...240 V
•
isolating transformer, e.g. 220 V/ 220 V
•
voltmeter
•
stop watch or counter for time measurement
•
ac/dc voltage source for the auxiliary supply
•
switches and indicator lamps
•
supply and pilot wires
•
calibrated multimeter
Note!
For the selected rated voltage and maximum input voltage withstand of the relay
when the measuring wires are connected to the terminals of the relay, see chapter
“Technical data”.
