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1MRK 504 160-UEN -
10.4.6.9
10.5
10.5.1
10.5.1.1
Transformer protection RET650 2.1 IEC
Commissioning manual
Testing functionality by secondary injection
6.
Apply the fault and the start again. The value of current should be below the set
value I>BlkCont.
7.
Arrange disconnection of BC closed signal(s) well before set back-up trip time
t2. It simulates a correct CB tripping.
8.
Verify that back-up trip is not achieved. Re-trip can appear for example, due to
selection "Re-trip without current check".
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting
to Off. Restore connections and settings to their original values, if they were changed
for testing purposes.
Multipurpose protection
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 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.
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
in this chapter.
Section 10
"Requirements"
and
81
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