ABB RED670 - Completing the Test; Measuring the Operating Limit of Set Values; Full Scheme Distance Protection, Mho Characteristic ZMHPDIS121

11.4.2.1 Measuring the operating limit of set values
M13906-73 v6
Procedure:
1. Supply the
IED with healthy conditions for at least two seconds.
2. Apply the fault condition and slowly decrease the measured impedance to
find the operate value for of the phase-to-earth loop L3, test point 1,
according to figure
25. Compare the result of the measurement with the
expected value according to table 22.
The corresponding binary signals that inform about the operation of the phase
selection measuring elements are available in the local HMI under
Main menu/Test/Function status/Impedance Pr
otection/
PhaseSelection(PDIS, 21)/FDPSPDIS:x.
3. Repeat steps
1 to 2 to find the operate values for the remaining test points
according to figure 25 and table 22.
When the load encroachment characteristic is deliberately set
very high in order not to have an influence, then the test points
2 and 5 can be replaced by test point 7.
4. Repeat steps 1 to 3 to find the operate value for the phase-to-phase fault in L1
— L2 according to figure 26 and table 23.
11.4.2.2 Completing the test
M13906-301 v5
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.
11.4.3 Full scheme distance protection, mho characteristic
ZMHPDIS
M14944-3 v10
Prepare the IED for verification of settings outlined in Section
"Preparing the IED
to verify settings".
Consider releasing of the zone to be tested by setting the phase selector FMPSPDIS
to
On.
The programming of the autorecloser function SMBRREC determines if three-
phase or single-phase trip is initiated as result of the test.
Keep the current constant when measuring operating characteristics. Keep the
current as close as possible to its rated value or lower. But make sure it is higher
than the set minimum operating current.
Ensure that the maximum continuous current in an IED does not exceed four times
its rated value, if the measurement of the operating characteristics runs under
constant voltage conditions.
1MRK 505 378-UEN A Section 11
Testing functionality by secondary injection
Line differential protection RED670 2.2 IEC 121
Commissioning manual