R
jX
ArgLd
ArgLd
RLdOutFw
RLdInFw
R1FInFw
R1FInRv
RLdInRv
RLdOutRv
X1InFw
X1OutFw
ZL
R1LIn
X1InRv
X1OutRv
IEC09000222_1_en.vsd
D
Rv
D
Rv
D
Rv
D
Rv
D
Rv
D
Fw
D
Fw
D
Fw
D
Fw
D
Fw
D
Fw
j
j
j
IEC09000222 V1 EN
Figure 51:
Operating characteristic for ZMRPSB function (setting parameters in
italic)
The impedance measurement within ZMRPSB function is performed by solving
equation
and equation
(n = 1, 2, 3 for each corresponding phase L1, L2 and L3).
R
set
Re
n
n
I
U
L
L
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EQUATION1183 V2 EN
(Equation 30)
I
m
n
n
X
set
I
U
L
L
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EQUATION1184 V2 EN
(Equation 31)
The R
set
and X
set
are R and X boundaries.
7.1.6.1
Resistive reach in forward direction
To avoid load encroachment, the resistive reach is limited in forward direction by
setting the parameter
RLdOutFw
which is the outer resistive load boundary value
while the inner resistive boundary is calculated according to equation
.
Section 7
1MRK 504 135-UEN A
Impedance protection
126
Technical manual
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