ABB RED670 Relion 670 series, Commissioning Manual

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10. Disconnect the test equipment and reconnect the current transformers.
11. Read and check the service values of the three-phase current.
12. Switch off the test mode and the local function.
With a through-load current (maximum current of line ends)
of minimum 20% of
IBase , IDiff and IBias currents are read in
all phases. IDiff must be less than 10% of the maximum line
end current, and IBias must be equal to the largest line end
current.
11.3.3.2 Completing the test
GUID-7A894B58-6E8F-4D94-A1C6-D86DD2377D8B v2
Continue to test another function or end the test by setting TESTMODE = Off .
Restore connections and settings to their original values if they were changed for
testing purposes.
After finishing a loop test with a line-in service, and before leaving
the test mode,
ReleaseLocal must be set to BlockAll on the local
HMI under Main menu/Test/Line differential test/LineDiffLogic .
If not done, the load current may cause incorrect L4CPDIF
operation when the IED is restarted.
11.3.4 Line differential protection L3CPDIF and L6CPDIF
SEMOD56264-55 v6
Prepare the IED for verification of settings as outlined in section "Requirements"
and section "Preparing for test" in this chapter.
The test of the line differential protection is done with the different IEDs
geographically separated from each other. It is important to note that local actions,
in one IED, may cause operation in remotely located IEDs. In the test of the line
differential function actions must be done in all involved IEDs.
When the protection at one end is activated to Test mode, this
information is automatically sent to remote end IEDs through the
LineDiffLogic function block and the remote functions are then
also blocked automatically.
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
1MRK 505 378-UEN A
Section 11
Testing functionality by secondary injection
Line differential protection RED670 2.2 IEC 109
Commissioning manual