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

Section 10
Testing IED operation
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Use COMBITEST test system to prevent unwanted tripping when the handle is withdrawn, since latches
on the handle secure it in the half withdrawn position.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 When the latches are released, the handle can be completely withdrawn from the test switch,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.
78
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 grounded before testing.
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Commissioning manual