Connecting The Test Equipment To The Ied - ABB Relion 650 Series REL650 Commissioning Manual

Section 5
Testing IED operation
5.4
40
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withdrawn, since latches on the handle secure it in the half withdrawn position.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released, the handle can be completely withdrawn from the test switch, restoring the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.
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.

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 8.
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.
To ensure correct results, make sure that the IED as well as the test
equipment are properly grounded before testing.
1MRK 506 331-UUS A
Commissioning Manual