Measuring The Operating Limit Of Set Values; Completing The Test; Full Scheme Distance Protection, Mho Characteristic Zmhpdis (21) - ABB Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
11.4.2.1

Measuring the operating limit of set values

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-ground loop ECG, 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 Protection/PhaseSelection(PDIS, 21)/
FDPSPDIS:x.
3. Repeat steps
figure
4. Repeat steps
to figure
11.4.2.2

Completing the test

continue to test another function or end the test by changing the
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
(21)
Prepare the IED for verification of settings outlined in Section
settings".
Consider releasing of the zone to be tested by setting the phase selector FMPSPDIS to
The programming of the autorecloser function SMBRREC (79) 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.
To verify the mho characteristic, at least two points should be tested.
In the following, three test points are proposed. The mho characteristic always goes through the
origin, which automatically gives a fourth point for the characteristic.
108
1 to 2 to find the operate values for the remaining test points according to
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.
1 to 3 to find the operate value for the phase-to-phase fault in A - C according
26 and table 23.
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TESTMODE setting to Disabled .
"Preparing the IED to verify
Line distance protection REL670
Commissioning manual
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