Built-In Overcurrent Feature (Non-Directional); Overcurrent Feature With Current Restraint - ABB Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
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.
11.8.1.1

Built-in overcurrent feature (non-directional)

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
8. Check that TRIP and START contacts operate according to the configuration logic.
9. Release the blocking of the high set stage and check the operate and reset value and the
time delay for the high set stage in the same way as for the low set stage.
10. Finally check that START and TRIP information is stored in the event menu.
11.8.1.2

Overcurrent feature with current restraint

The current restraining value has also to be measured or calculated and the influence on the
operation has to be calculated when the testing of the operate value is done.
Procedure
1. Operate value measurement
The current restraining value has also to be measured or calculated and the influence on
the operation has to be calculated when the testing of the operate value is done.
202
tMin .
Information on how to use the event menu is found in the operator's
manual.
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CurrentInput and VoltageInput .
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Commissioning manual