R
jX
LdAngle
LdAngle
RLdOutFw
RLdInFw
R1FInFw
R1FInRv
RLdInRv
RLdOutRv
X1InFw
X1OutFw
ZL
R1LIn
X1InRv
X1OutRv
ANSI05000175-2-en.vsd
D
Fw
j
j
j
D
Rv
D
Rv
D
Rv
D
Rv
D
Rv
D
Fw
D
Fw
D
Fw
D
Fw
D
Fw
ANSI05000175 V2 EN
Figure 62:
Operating characteristic for ZMRPSB (68) function (setting parameters in
italic)
The impedance measurement within ZMRPSB (68) function is performed by solving
equation
(Typical equations are for phase A, similar equations are
applicable for phases B and C).
Re
A
A
V
Rset
I
æ
ö
£
ç
÷
è
ø
EQUATION1557 V1 EN
(Equation 34)
Im
A
A
V
Xset
I
æ
ö
£
ç
÷
è
ø
EQUATION1558 V1 EN
(Equation 35)
The R
set
and X
set
are R and X boundaries.
Section 7
1MRK 502 048-UUS A
Impedance protection
154
Technical manual