Built-In Overcurrent Feature (Non-Directional) - ABB REG670 Commissioning Manual

1MRK 502 073-UEN A
13.8.1.1
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Commissioning manual
Testing functionality by secondary injection
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.

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 tMin.
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.
Information on how to use the event menu is found in the
operator's manual.
Section 13
SEMOD56488-9 v5
221