GE L90 Instruction Manual page 324
Line differential relay
ur series
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6.4 RECORDS
and neglecting shunt parameters of the line:
Inserting the I
and I
A
B
Assuming the fault components of the currents, I
ance, does not have any imaginary part gives:
where: Im() represents the imaginary part of a complex number. Solving the above equation for the unknown m creates the
following fault location algorithm:
where * denotes the complex conjugate and:
Depending on the fault type, appropriate voltage and current signals are selected from the phase quantities before applying
the two equations above (the superscripts denote phases, the subscripts denote stations):
•
For AG faults:
V
A
•
For BG faults:
V
A
•
For CG faults:
V
A
•
For AB and ABG faults:
6
•
For BC and BCG faults:
•
For CA and CAG faults:
where K
is the zero sequence compensation factor (for the first six equations above)
0
•
For ABC faults, all three AB, BC, and CA loops are analyzed and the final result is selected based upon consistency of
the results
The element calculates the distance to the fault (with m in miles or kilometers) and the phases involved in the fault.
6-20
I
B
equations into the V
equation and solving for the fault resistance yields:
A
R
=
F
and I
AF
V
A
-----------------------------------
Im
m
=
I
AF
A
A
⋅
V
,
I
I
K
I
=
=
+
A
A
A
0
0A
B
B
⋅
V
,
I
I
K
I
=
=
+
A
A
A
0
0A
C
BC
⋅
V
,
I
I
K
I
=
=
+
A
A
A
0
0A
A
B
V
V
V
,
I
I
=
–
=
A
A
A
A
B
C
V
V
V
,
I
=
–
=
A
A
A
A
C
A
V
V
V
,
I
=
–
=
A
A
A
A
SETTING
FAULT REPORT
TRIG:
Off=0
SETTING
FAULT REPORT
SOURCE:
0
SRC X 50DD OP
A
B
C
3 _0
VA
VB
VC
SHOT # FROM
AUTO RECLOSURE
Figure 6–5: FAULT LOCATOR SCHEME
L90 Line Differential Relay
I
I
=
–
BF
Apre
⋅
⋅
V
m Z I
–
A
A
-----------------------------------
I
BF
⋅
I
1
------- -
+
AF
I
AF
are in phase, and observing that the fault resistance, as imped-
BF
⋅
⋅
m Z I
–
A
0
=
I
AF
∗
(
⋅
)
Im V
I
A
AF
--------------------------------------- -
∗
(
⋅
⋅
)
Im Z I
I
A
AF
I
I
=
–
A
Apre
A
B
I
–
A
A
B
C
I
I
–
A
A
C
A
I
I
–
A
A
AND
RUN
3 SEC
FAULT
LOCATOR
6 ACTUAL VALUES
ACTUAL VALUES
FAULT REPORT #
DATE
TIME
FAULT TYPE
FAULT LOCATION
FAULT# RECLOSE SHOT
827094A4.CDR
(EQ 6.3)
(EQ 6.4)
(EQ 6.5)
(EQ 6.6)
(EQ 6.7)
GE Multilin
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