96
Distance protection Chapter 11
Verifying settings by secondary
injection
The table showing test points for three phase loops is used together with figure 30.
5.2.1 Measuring the operate limit of set values
Procedure
1. Supply the terminal with healthy conditions for at least two seconds.
2. Apply the fault condition and slowly decrease the measured imped-
ance to find the operate value for of the phase to earth loop L3, test
point P1, according to figure
. Compare the result of the measure-
ment with the expected value according to table 30
.
The corresponding binary signals that inform about the operation of the
phase-selection measuring elements are available in the local HMI under
the menu:
Measurements/Monitoring/Current phasors
and
7
R=0.8·RLdFw
8
R=0.8·RLdFw
9 X=0.2·X1
10 X=0.8·X1
11 X=-0.5·RFFwPP·tan(AngDir)
R=0.5·RFFwPP
Note! This test points is proposed to be used instead of
point 4, 5, 6 and 7 when shaped load characteristic is not
activated
(OperationLdCmd=OFF)
Test point Value Comments
X0.8(23)
LdFw=− ⋅ − ⋅
X 0.214
LdFw
−⋅
X0.2(23)
LdFw=− ⋅ − ⋅
X 0.054
LdFw
−⋅
R 0.2 1 tan( 90)XArgNegDir=⋅⋅ −
R0.0931Xset
⋅
R 0.2 1 tan( 90)XArgNegDir=⋅⋅ −
R0.3731X
⋅
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