Verifying The Settings - ABB Relion 650 Series Commissioning Manual

1MRK 505 395-UEN Rev. G
Before test the trip signal to the circuit breaker must be blocked, for example by applying the
COMBITEST test switch.
Line differential protection must be set in test mode. This involves switching the IED to Test mode
and the functions involved in the test. For the Differential protection there are settings to Test mode
and also the activation of the local function with setting "Release local". Remember also for example
the trip function block deblocking to be able to measure trip times. In the test mode the injected
current is communicated to the remote IEDs and sent back to the IED under test. The echoed current
is switched in phase so that current in phase L1 is returned in phase L2, current in phase L2 is
returned in phase L3 and current in phase L3 is returned in phase L1. The amplitude of the returned
current can be set separately as a ratio of the injected current.
Take a line with three IEDs, for example, set the return current from each remote IED to be 50% of
the injected current. Inject a current Iinjected, L1 in phase L1 to get the following differential and bias
currents:
Phase L1:
IDiff
L 1
EQUATION1458 V1 EN-US
Phase L2:
IDiff
L
EQUATION1459 V1 EN-US
Phase L3:
IDiff
L3
EQUATION1460 V2 EN-US
9.3.1.1

Verifying the settings

Procedure
1. Block the trip signal from all involved IEDs with local operation released. See below.
2. Set Test mode to On for the Line differential function for test.
3. Release the local function with setting ReleaseLocal in local HMI under: Main menu /Test /
Line differential test /LineDiffLogic
4. Set the factor of the return currents to 1/(number of current IEDs = 1).
5. Inject a current in phase L1 and increase the current until the function operates for phases L1
and L2.
The injected operate current must correspond to the set IdMin. The service values for IDiffL1,
IBiasL1, IDiffL2 and IBiasL2 must be equal to the injected current.
6. Repeat step
7. Inject a symmetrical three-phase current, and increase the current until operation is achieved in
all three phases.
The injected operate current must correspond to the set IdMin. The service values for IDiffL1,
IBiasL1, IDiffL2, IBiasL3, IDiffL3 and IBiasL3 must be equal to the injected current.
8. Read the transmission delay.
9. Measure the operating time by injection of a single-phase current in phase 1.
The injected current must be 4 times the operating current. The time measurement is stopped
by the trip output.
Note that tripping times at this loop test includes sending the local currents to remote side and
with a factor sending them back. This means that tripping times are virtually double to the times
achieved at a real fault or at bench testing.
10. Check the negative sequence fault discriminator by injecting a three-phase current with
changed phase sequence: switch phases L1 and L2. The injected current will now be seen as a
Line differential protection RED650
Commissioning manual
= =
IBias I
L 1 injected L , 1
= =
IBias I
2 L 2 injected L , 1
= IBias = 0
L3
4 by current injection in phases L2 and L3.
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Section 9
Testing functionality by secondary injection
SEMOD56264-69 v4
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