Multipurpose Protection - ABB RET670 Commissioning Manual

1MRK 504 154-UUS B
10.8

Multipurpose protection

10.8.1 General current and voltage protection CVGAPC
Prepare the IED for verification of settings as outlined in section
section "Preparing for test"
One of the 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
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.
10.8.1.1 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 trips
and check against the set trip 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 trip value of low set stage, switch on the current and check
the time delay.
For inverse time curves, check the trip time at a current equal to 110% of the trip current at
t_MinTripDelay .
8. Check that TRIP and PICKUP contacts trip according to the configuration logic.
9. Release the blocking of the high set stage and check the trip 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 PICKUP and TRIP information is stored in the event menu.
Commissioning manual
in this chapter.
CurrentInput and VoltageInput .
Information on how to use the event menu is found in the operator's manual.
Testing functionality by secondary injection
"Requirements" and
Section 10
SEMOD53552-1 v1
SEMOD56488-3 v3
SEMOD56488-9 v5
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