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1MRK 505 378-UEN Rev. K
Document
revision
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11.8.2
General current and voltage protection CVGAPC
Prepare the IED for verification of settings as outlined in section
section
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 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.
11.8.2.1
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 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.
Line differential protection RED670
Commissioning manual
Product
History
revision
2.2.4
-
2.2.4
-
2.2.4
-
2.2.5
•
The harmonic restraint function changed to freeze the definite and IDMT timers.
•
The maximum value of the settings IMin1 and IMin2 has been decreased to 1000.0
% of IBase.
•
Setting BlkLevel2nd was removed from the function.
•
Previously called stepwise settings t_DefOCx and tResetDef_OCx had their names
changed to t_OCx and tReset_OCx for more clear understanding.
"Preparing for test"
in this chapter.
© 2017 - 2022 Hitachi Energy. All rights reserved
Testing functionality by secondary injection
"Requirements"
and
Section 11
SEMOD56488-3 v4
SEMOD56488-9 v5
195
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