333
Fault locator (FLOC)
&KDSWHU
0RQLWRULQJ
and:
•
Z
ADD
= Z
A
+ Z
B
for parallel lines.
•
I
A
, I
FA
and U
A
are given in the above table.
•
KN is calculated automatically according to equation 67.
•
Z
A
, Z
B
, Z
L
, Z
0L
and Z
0M
are setting parameters.
Equation 70 can be divided into real and imaginary parts:
(Equation 74)
(Equation 75)
If the imaginary part of K
3
is not zero, R
F
can be solved according to equation 75, and
then inserted to equation 74. According to equation 74, the relative distance to the fault
is solved as the root of a quadratic equation.
Equation 74 gives two different values for the relative distance to the fault as a solution.
A simplified load compensated algorithm, that gives an unequivocal figure for the rel-
ative distance to the fault, is used to establish the value that should be selected.
If the load compensated algorithms according to the above do not give a reliable solu-
tion, a less accurate, non-compensated impedance model is used to calculate the relative
distance to the fault.
7KHQRQFRPSHQVDWHGLPSHGDQFHPRGHO
In the non-compensated impedance model, I
A
line current is used instead of I
FA
fault
current:
(Equation 76)
p
2
p Re K
1
(
)
Re K
2
(
)
R
F
Re K
3
(
)
0
=
⋅
–
+
⋅
–
p Im
K
1
( )
Im
K
2
( )
R
F
Im
K
3
( )
0
=
⋅
⋅
–
⋅
+
⋅
⋅
–
Where:
I
A
is according to table 15.
U
A
p Z
1 L
I
A
R
F
I
A
⋅
+
⋅
⋅
=
Summary of Contents for REO 517
Page 10: ... RQWHQWV ...
Page 16: ...6 Introduction to the application manual KDSWHU QWURGXFWLRQ ...
Page 64: ...54 Blocking of signals during test KDSWHU RPPRQ IXQFWLRQV ...
Page 88: ...78 Scheme communication logic ZCOM KDSWHU LQH LPSHGDQFH ...
Page 146: ...136 Unbalance protection for capacitor banks TOCC KDSWHU XUUHQW ...
Page 166: ...156 Dead line detection DLD KDSWHU 3RZHU V VWHP VXSHUYLVLRQ ...
Page 378: ...368 Monitoring of DC analog measurements KDSWHU 0RQLWRULQJ ...
Page 384: ...374 Pulse counter logic PC KDSWHU 0HWHULQJ ...
Page 412: ...402 Serial communication modules SCM KDSWHU DWD FRPPXQLFDWLRQ ...
Page 440: ...430 LED indication module KDSWHU DUGZDUH PRGXOHV ...
