Connecting The Test Equipment To The Ied - ABB Relion 670 Series Commissioning Manual

Section 10
Testing IED operation
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 CTs,
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Use COMBITEST test system to prevent unwanted tripping when the handle is withdrawn,
since latches on the handle secure it in the half withdrawn position.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 re-energizing 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completely withdrawn from the test switch, restoring the trip circuits to the protection IED.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, perform measurement according to the provided circuit diagrams.
10.4

Connecting the test equipment to the IED

Connect the test equipment according to the IED specific connection diagram and the needed
input and output signals for the function under test. An example of a connection is shown in
figure 19.
Connect the current and voltage terminals. Pay attention to the current polarity. Make sure
that the connection of input and output current terminals and the connection of the residual
current conductor is correct. Check that the input and output logical signals in the logic
diagram for the function under test are connected to the corresponding binary inputs and
outputs of the IED under test.
82
Never disconnect the secondary connection of a current transformer circuit
without first short-circuiting the transformer's secondary winding. Operating a
current transformer with the secondary winding open will cause a massive
potential build up that may damage the transformer and cause personal injury.
To ensure correct results, make sure that the IED as well as the test equipment
are properly earthed before testing.
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Commissioning manual