10. Check that the
START
signal reappears.
11. Slowly increase the positive-sequence voltage of the injected voltage above the
UHighLimit value until the
START
signal disappears.
12. Compare the reset value to the set voltage high limit value.
12.7.4.2
Completing the test
GUID-83C3F041-9553-4804-9A39-B3E46A5C9AE6 v2
•
Continue to test another function or end the test by changing the
Test mode setting to
off.
•
Restore connections and settings to their original values if they were changed for testing
purposes.
12.8
Multipurpose protection
SEMOD53552-1 v1
12.8.1
General current and voltage protection CVGAPC
SEMOD56488-3 v3
Prepare the IED for verification of settings as outlined in section
in this chapter.
One of the new 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
CurrentInput and VoltageInput.
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.
12.8.1.1
Built-in overcurrent feature (non-directional)
SEMOD56488-9 v5
Procedure
1.
Go to Main menu/Test/Function test modes/Multipurpose protection/
GeneralCurrentVoltage(GAPC)/CVGAPC:x and make sure that CVGAPC to be tested is
unblocked and other functions that might disturb the evaluation of the test are blocked.
2.
Connect the test set for injection of three-phase currents to the appropriate current
terminals of the IED.
3.
Inject current(s) in a way that relevant measured current (according to setting parameter
CurrentInput) is created from the test set. Increase the current(s) until the low set stage
operates and check against the set operate value.
4.
Decrease the current slowly and check the reset value.
5.
Block high set stage if the injection current will activate the high set stage when testing
the low set stage according to below.
6.
Connect a TRIP output contact to the timer.
7.
Set the current to 200% of the operate value of low set stage, switch on the current and
check the time delay.
For inverse time curves, check the operate time at a current equal to 110% of the operate
current at
tMin.
1MRK 502 067-UEN B
Section 12
Testing functionality by secondary injection
197
Commissioning manual
