ABB Relion 650 Series Technical Manual page 147

1MRK 506 326-UUS B
LdAngle
ANSI05000175 V2 EN-US
Figure 79: Operating characteristic for ZMRPSB (68) function (setting parameters in italic)
The impedance measurement within ZMRPSB (68) function is performed by solving equation
and equation
and C).
æ
V
A
Re
ç
I
è
A
EQUATION1557 V1 EN-US
æ
V
A
Im
ç
I
è
A
EQUATION1558 V1 EN-US
The R
set
5.7.6.1 Resistive reach in forward direction
To avoid load encroachment, the resistive reach is limited in forward direction by setting the
parameter
boundary is calculated according to equation 27.
Line distance protection REL650
Technical manual
X1OutFw
X1InFw
D
Rv
D
Rv
D
Rv
j
26 (Typical equations are for phase A, similar equations are applicable for phases B
ö
£
Rset
÷
ø
ö
£
Xset
÷
ø
and X are R and X boundaries.
set
RLdOutFw which is the outer resistive load boundary value while the inner resistive
© Copyright 2011 ABB Power Grids. All rights reserved
jX
ZL
R1FInRv R1FInFw
j
D
Rv
D
Fw
RLdInRv
RLdInFw
RLdOutFw
RLdOutRv
D
Rv
R1LIn
D
Fw
j
D
Fw
LdAngle
D
Fw
R
D
Fw
D
Fw
X1InRv
X1OutRv
ANSI05000175-2-en.vsd
Section 5
Impedance protection
25
(Equation 25)
(Equation 26)
M13877-6 v3
141