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Section 11
Testing functionality by secondary injection
Table 23:
Test point
1
2
3
4
5
6
Table
23
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-earth loop L3, test point 1, according to figure 27. 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
27
4.
Repeat steps
to figure
11.4.2.2
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
11.4.3
Full scheme distance protection, mho characteristic ZMHPDIS
Prepare the IED for verification of settings outlined in Section
Consider releasing of the zone to be tested by setting the phase selector FMPSPDIS to On.
108
Test points for phase-to-phase loops L1–L2 (Ohm/phase)
Reach
Value
X
X1
R
0
X
0
R
RLdFw
R
0,5·RFFwPP
X
0.85·X1
R
0.85·X1·1/tan(60°)+0.5 RFFwPP
X
0.85·X1
R
-0.85·X1·tan (AngNegRes-90°)
X
0.5·RFFwPP·tan (ArgLd)
R
0.5·RFFwPP
X
-0.5·RLdFw·tan (ArgDir)
R
0.5·RLdFw
is used together with figure 28.
1
to
2
to find the operate values for the remaining test points according to figure
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 L1 — L2 according
28
and table 23.
© 2017 - 2022 Hitachi Energy. All rights reserved
1MRK 504 165-UEN Rev. K
Comments
When RLdFw < 0,5·RFFwPP
When RLdFw > 0,5·RFFwPP
R=0.491·X1+0.5 RFFwPP
Can be limited by RFFwPP
Only when RLdFW < RFFwPP
"Preparing the IED to verify
Transformer protection RET670
M13906-73 v6
M13906-301 v5
M14944-3 v10
settings".
Commissioning manual
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