Hitachi Relion 670 Series Commissioning Manual page 112

Section 11
Testing functionality by secondary injection
Table 29:
Test point
1
2
3
4
5
6
The table showing test points for phase-to-ground loops is used together with figure 31.
Table 30:
Test point
1
2
3
4
5
6
The table showing test points for phase-to-phase loops is used together with figure 32.
11.4.6.1 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 31. Compare the result of the
measurement with the expected value according to table 29.
The corresponding binary signals that inform about the operation of the phase selection measuring
elements are available in the local HMI under
106
Test points for phase-to-ground loop CG (Ohm/loop)
Value
X [X1+XN]
R 0
X 0
R RLdFwd
X 0.85·[X1+XN]
R 0.85·[X1+XN]·1/tan(60°)+RFFwPE
X 0.85·[X1+XN]
R -0.85·[X1+XN]·
tan (AngNegRes-90°)
X RFltFwdPG·tan (LdAngle)
R RFltFwdPG
X -0,5·RLdFwd·tan (ArgDir)
R 0,5·RLdFwd
Test points for phase-to-phase loops A-B
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
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Comments
XN=(X -X )/3
0 1
R≈0.491·(X1+XN)+RFFwPE
Comments
R=0.491·X1+0.5 RFLdFwdPP
GUID-B1B7DEB6-7BC3-4A90-8D8F-E4E69B434AFA v3
Line distance protection REL670
1MRK506371-UUS Rev. M
Commissioning manual