ABB Relion 670 Series Commissioning Manual page 202

Section 11
Testing functionality by secondary injection
11.7.3.1 Verifying the settings
PICKUP value and time delay to trip
1. Check that the settings in the IED are appropriate, especially the PICKUP value and the
definite time delay. Set
2. Supply the IED with three-phase voltages at their rated values.
3. Slowly decrease the frequency of the applied voltage, with an increasing rate-of-change that
finally exceeds the setting of
4. Note the trip value and compare it with the set value.
5. Increase the frequency to rated operating conditions, and zero rate-of-change.
6. Check that the PICKUP signal resets.
7. Instantaneously decrease the frequency of the applied voltage to a value about 20% lower
than the nominal value.
8. Measure the time delay for the TRIP signal, and compare it with the set value.
Extended testing
1. The test above can be repeated to check a positive setting of
2. The tests above can be repeated to check the time to reset.
3. The tests above can be repeated to test the RESTORE signal, when the frequency recovers
from a low value.
11.7.3.2 Completing the test
continue to test another function or end the test by changing the
Restore connections and settings to their original values, if they were changed for testing
purposes.
11.8 Multipurpose protection
11.8.1 General current and voltage protection CVGAPC
Prepare the IED for verification of settings as outlined in section
section "Preparing for test"
One of the facilities within the general current and voltage protection function CVGAPC is that the
value, which is processed and used for evaluation in the function, can be chosen in many different
ways by the setting parameters
These setting parameters decide what kind of preprocessing the connected three-phase CT and
VT inputs shall be subjected to. That is, for example, single-phase quantities, phase-to-phase
quantities, positive sequence quantities, negative sequence quantities, maximum quantity from
the three-phase group, minimum quantity from the three-phase group, difference between
maximum and minimum quantities (unbalance) can be derived and then used in the function.
Due to the versatile possibilities of CVGAPC itself, but also the possibilities of logic combinations
in the application configuration of outputs from more than one CVGAPC function block, it is hardly
possible to define a fully covering general commissioning test.
196
PickupFreqgrad , to a rather small negative value.
PickupFreqgrad , and check that the PICKUP signal appears.
in this chapter.
CurrentInput and VoltageInput .
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1MRK 506 371-UUS E
PickupFreqGrad .
TESTMODE setting to Disabled .
"Requirements" and
Line distance protection REL670
Commissioning manual
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