Activating Test Mode; Preparing The Connection To The Test Equipment - ABB ret650 Commissioning Manual

1MRK 504 126-UEN -
5.2
5.3
Commissioning Manual

Activating test mode

Put the IED into the test mode before testing. The test mode blocks all functions in
the IED, and the individual functions to be tested can be unblocked to prevent
unwanted operation caused by other functions. In this way, it is possible to test
slower back-up measuring functions without the interference from faster measuring
functions. Test mode is indicated when the yellow Start LED flashes.
Procedure
1. Select Main menu/Tests/IED test mode/1:TESTMODE
2. Set parameter TestMode to On.
3. Save the changes.
As a consequence, the yellow Start LED starts flashing as a reminder and
remains flashing until the test mode is switched off.

Preparing the connection to the test equipment

The IED can be equipped with a test switch of type RTXP8, RTXP18 or RTXP24.
The test switch and its associated test plug handle (RTXH8, RTXH18 or RTXH24)
are a part of the COMBITEST system, which provides secure and convenient
testing of the IED.
When using the COMBITEST, preparations for testing are automatically carried
out in the proper sequence, that is, for example, blocking of tripping circuits, short
circuiting of CT's, opening of voltage circuits, making IED terminals available for
secondary injection. Terminals 1 and 8, 1 and 18 as well as 1 and 12 of the test
switches RTXP8, RTXP18 and RTXP24 respectively are not disconnected as they
supply DC power to the protection IED.
The RTXH test-plug handle leads may be connected to any type of test equipment
or instrument. When a number of protection IEDs of the same type are tested, the
test-plug handle only needs to be moved from the test switch of one protection IED
to the test switch of the other, without altering the previous connections.
Use COMBITEST test system to prevent unwanted tripping when the handle is
withdrawn, since latches on the handle secure it in the half withdrawn position. In
this position, all voltages and currents are restored and any reenergizing transients
are given a chance to decay before the trip circuits are restored. When the latches
are released, the handle can be completely withdrawn from the test switch,
restoring the trip circuits to the protection IED.
If a test switch is not used, take measures according to provided circuit diagrams.
Never disconnect the secondary connection of a current transformer
circuit without short-circuiting the transformer's secondary
winding. Operating a current transformer with the secondary
Section 5
Testing IED operation
33