Resistive Reach In Forward Direction - ABB RED650 Technical Manual

1MRK 505 394-UEN A
7.2.6.1
Line differential protection RED650 2.2 IEC
Technical manual
D
ArgLd
D
D
Rv
j
IEC09000222 V1 EN-US
Figure 66: Operating characteristic for ZMRPSB function (setting parameters
in italic)
The impedance measurement within ZMRPSB function is performed by solving
equation 13 and equation
L3).
æ ö
U
L n
ç ç ÷ ÷ £
Re
R
set
I
è ø
L n
EQUATION1183 V2 EN-US
æ ö
U
L n
ç ç ÷ ÷ £
I X
m
set
I
è ø
L n
EQUATION1184 V2 EN-US
The R and X are R and X boundaries.
set set

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 15.
jX
X1OutFw
X1InFw
Rv
R1FInRv
D
Rv
Rv
RLdInRv
RLdOutRv
D
Rv
14 (n = 1, 2, 3 for each corresponding phase L1, L2 and
Section 7
Impedance protection
R1LIn
ZL
D
Fw
R1FInFw
j
D
Fw
D
Fw
D
Fw
D
Fw
RLdInFw
RLdOutFw
X1InRv
X1OutRv
IEC09000222_1_en.vsd
j
D
Fw
ArgLd
R
(Equation 13)
(Equation 14)
M13877-6 v3
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