Measuring The Operating Limit Of Set Values - ABB RET670 Commissioning Manual

1MRK 504 154-UUS B
Table 26: Test points for phase-to-phase loops A-B
Test point
1
2
3
4
5
6
The table showing test points for phase-to-phase loops is used together with figure 23.
10.4.6.1

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 22. Compare the
result of the measurement with the expected value according to table 25.
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)/
FRPSPDIS:x .
3. Repeat steps
figure
4. Repeat steps
to figure
10.4.6.2 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.
Commissioning manual
Value
X X1
R 0
X 0
R RLdFwd
X 0.85·X1
R 0.85·X1·1/tan(60°)+0.5
RFLdFwdPP
X 0.85·X1
R -0.85·X1·tan (AngNegRes-90°)
X 0.5·RFLdFwdPP·tan (ArgLd)
R 0.5·RFLdFwdPP
X -0.5·RLdFwd·tan (ArgDir)
R 0.5·RLdFwd
1 to 2 to find the operate values for the remaining test points according to
22 and table 25.
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
23 and table 26.
Testing functionality by secondary injection
Comments
R=0.491·X1+0.5 RFLdFwdPP
GUID-B1B7DEB6-7BC3-4A90-8D8F-E4E69B434AFA v3
TestMode setting to Disabled .
Section 10
M13906-301 v5
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